Update go.mod (for real)

GetFontName serialize font size properly
thanks @piotrkowalczuk

.gitignore

@@ -21,3 +21,5 @@ _test*
 **/core*[0-9]
 .private
 
+go.sum
+

.project

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>draw2d</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>com.googlecode.goclipse.goBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>goclipse.goNature</nature>
-	</natures>
-</projectDescription>

AUTHORS

@@ -1,2 +1,4 @@
 Laurent Le Goff
 Stani Michiels, gmail:stani.be
+Drahoslav Bednář
+Sebastien Binet

README.md

@@ -1,5 +1,7 @@
 draw2d
 ======
+[![Coverage](http://gocover.io/_badge/github.com/llgcode/draw2d?0)](http://gocover.io/github.com/llgcode/draw2d)
+[![GoDoc](https://godoc.org/github.com/llgcode/draw2d?status.svg)](https://godoc.org/github.com/llgcode/draw2d)
 
 Package draw2d is a pure [go](http://golang.org) 2D vector graphics library with support for multiple output devices such as [images](http://golang.org/pkg/image) (draw2d), pdf documents (draw2dpdf) and opengl (draw2dgl), which can also be used on the google app engine. It can be used as a pure go [Cairo](http://www.cairographics.org/) alternative. draw2d is released under the BSD license. See the [documentation](http://godoc.org/github.com/llgcode/draw2d) for more details.
 
@@ -19,57 +21,84 @@ Installation
 
 Install [golang](http://golang.org/doc/install). To install or update the package draw2d on your system, run:
 
+Stable release
+```
+go get -u gopkg.in/llgcode/draw2d.v1
+```
+
+or Current release
 ```
 go get -u github.com/llgcode/draw2d
 ```
 
+
 Quick Start
 -----------
 
 The following Go code generates a simple drawing and saves it to an image file with package draw2d:
 
 ```go
-// Initialize the graphic context on an RGBA image
+package main
-dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
-gc := draw2d.NewGraphicContext(dest)
 
-// Set some properties
+import (
-gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
+	"github.com/llgcode/draw2d/draw2dimg"
-gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
+	"image"
-gc.SetLineWidth(5)
+	"image/color"
+)
 
-// Draw a closed shape
+func main() {
-gc.MoveTo(10, 10) // should always be called first for a new path
+	// Initialize the graphic context on an RGBA image
-gc.LineTo(100, 50)
+	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
-gc.QuadCurveTo(100, 10, 10, 10)
+	gc := draw2dimg.NewGraphicContext(dest)
-gc.Close()
-gc.FillStroke()
 
-// Save to file
+	// Set some properties
-draw2d.SaveToPngFile("hello.png", dest)
+	gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
+	gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
+	gc.SetLineWidth(5)
+
+	// Draw a closed shape
+	gc.BeginPath() // Initialize a new path
+	gc.MoveTo(10, 10) // Move to a position to start the new path
+	gc.LineTo(100, 50)
+	gc.QuadCurveTo(100, 10, 10, 10)
+	gc.Close()
+	gc.FillStroke()
+
+	// Save to file
+	draw2dimg.SaveToPngFile("hello.png", dest)
+}
 ```
 
 The same Go code can also generate a pdf document with package draw2dpdf:
 
 ```go
-// Initialize the graphic context on an RGBA image
+package main
-dest := draw2dpdf.NewPdf("L", "mm", "A4")
-gc := draw2d.NewGraphicContext(dest)
 
-// Set some properties
+import (
-gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
+	"github.com/llgcode/draw2d/draw2dpdf"
-gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
+	"image/color"
-gc.SetLineWidth(5)
+)
 
-// Draw a closed shape
+func main() {
-gc.MoveTo(10, 10) // should always be called first for a new path
+	// Initialize the graphic context on an RGBA image
-gc.LineTo(100, 50)
+	dest := draw2dpdf.NewPdf("L", "mm", "A4")
-gc.QuadCurveTo(100, 10, 10, 10)
+	gc := draw2dpdf.NewGraphicContext(dest)
-gc.Close()
-gc.FillStroke()
 
-// Save to file
+	// Set some properties
-draw2dpdf.SaveToPdfFile("hello.pdf", dest)
+	gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
+	gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
+	gc.SetLineWidth(5)
+
+	// Draw a closed shape
+	gc.MoveTo(10, 10) // should always be called first for a new path
+	gc.LineTo(100, 50)
+	gc.QuadCurveTo(100, 10, 10, 10)
+	gc.Close()
+	gc.FillStroke()
+
+	// Save to file
+	draw2dpdf.SaveToPdfFile("hello.pdf", dest)
+}
 ```
 
 There are more examples here: https://github.com/llgcode/draw2d/tree/master/samples
@@ -105,6 +134,7 @@ Packages using draw2d
  - [smartcrop](https://github.com/muesli/smartcrop): content aware image cropping
  - [karta](https://github.com/peterhellberg/karta): drawing Voronoi diagrams
  - [chart](https://github.com/vdobler/chart): basic charts in Go
+ - [hilbert](https://github.com/google/hilbert): package for drawing Hilbert curves
 
 References
 ---------

arc.go

@@ -1,70 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"math"
-
-	"code.google.com/p/freetype-go/freetype/raster"
-)
-
-func arc(t VertexConverter, x, y, rx, ry, start, angle, scale float64) (lastX, lastY float64) {
-	end := start + angle
-	clockWise := true
-	if angle < 0 {
-		clockWise = false
-	}
-	ra := (math.Abs(rx) + math.Abs(ry)) / 2
-	da := math.Acos(ra/(ra+0.125/scale)) * 2
-	//normalize
-	if !clockWise {
-		da = -da
-	}
-	angle = start + da
-	var curX, curY float64
-	for {
-		if (angle < end-da/4) != clockWise {
-			curX = x + math.Cos(end)*rx
-			curY = y + math.Sin(end)*ry
-			return curX, curY
-		}
-		curX = x + math.Cos(angle)*rx
-		curY = y + math.Sin(angle)*ry
-
-		angle += da
-		t.Vertex(curX, curY)
-	}
-}
-
-func arcAdder(adder raster.Adder, x, y, rx, ry, start, angle, scale float64) raster.Point {
-	end := start + angle
-	clockWise := true
-	if angle < 0 {
-		clockWise = false
-	}
-	ra := (math.Abs(rx) + math.Abs(ry)) / 2
-	da := math.Acos(ra/(ra+0.125/scale)) * 2
-	//normalize
-	if !clockWise {
-		da = -da
-	}
-	angle = start + da
-	var curX, curY float64
-	for {
-		if (angle < end-da/4) != clockWise {
-			curX = x + math.Cos(end)*rx
-			curY = y + math.Sin(end)*ry
-			return raster.Point{
-				X: raster.Fix32(curX * 256),
-				Y: raster.Fix32(curY * 256)}
-		}
-		curX = x + math.Cos(angle)*rx
-		curY = y + math.Sin(angle)*ry
-
-		angle += da
-		adder.Add1(raster.Point{
-			X: raster.Fix32(curX * 256),
-			Y: raster.Fix32(curY * 256)})
-	}
-}

curve/arc.go

@@ -1,36 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-package curve
-
-import (
-	"math"
-)
-
-func SegmentArc(t LineTracer, x, y, rx, ry, start, angle, scale float64) {
-	end := start + angle
-	clockWise := true
-	if angle < 0 {
-		clockWise = false
-	}
-	ra := (math.Abs(rx) + math.Abs(ry)) / 2
-	da := math.Acos(ra/(ra+0.125/scale)) * 2
-	//normalize
-	if !clockWise {
-		da = -da
-	}
-	angle = start + da
-	var curX, curY float64
-	for {
-		if (angle < end-da/4) != clockWise {
-			curX = x + math.Cos(end)*rx
-			curY = y + math.Sin(end)*ry
-			break
-		}
-		curX = x + math.Cos(angle)*rx
-		curY = y + math.Sin(angle)*ry
-
-		angle += da
-		t.LineTo(curX, curY)
-	}
-	t.LineTo(curX, curY)
-}

curve/cubic_float64.go

@@ -1,67 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 17/05/2011 by Laurent Le Goff
-package curve
-
-import (
-	"math"
-)
-
-const (
-	CurveRecursionLimit = 32
-)
-
-//	X1, Y1, X2, Y2, X3, Y3, X4, Y4 float64
-type CubicCurveFloat64 [8]float64
-
-type LineTracer interface {
-	LineTo(x, y float64)
-}
-
-func (c *CubicCurveFloat64) Subdivide(c1, c2 *CubicCurveFloat64) (x23, y23 float64) {
-	// Calculate all the mid-points of the line segments
-	//----------------------
-	c1[0], c1[1] = c[0], c[1]
-	c2[6], c2[7] = c[6], c[7]
-	c1[2] = (c[0] + c[2]) / 2
-	c1[3] = (c[1] + c[3]) / 2
-	x23 = (c[2] + c[4]) / 2
-	y23 = (c[3] + c[5]) / 2
-	c2[4] = (c[4] + c[6]) / 2
-	c2[5] = (c[5] + c[7]) / 2
-	c1[4] = (c1[2] + x23) / 2
-	c1[5] = (c1[3] + y23) / 2
-	c2[2] = (x23 + c2[4]) / 2
-	c2[3] = (y23 + c2[5]) / 2
-	c1[6] = (c1[4] + c2[2]) / 2
-	c1[7] = (c1[5] + c2[3]) / 2
-	c2[0], c2[1] = c1[6], c1[7]
-	return
-}
-
-func (curve *CubicCurveFloat64) Segment(t LineTracer, flattening_threshold float64) {
-	var curves [CurveRecursionLimit]CubicCurveFloat64
-	curves[0] = *curve
-	i := 0
-	// current curve
-	var c *CubicCurveFloat64
-
-	var dx, dy, d2, d3 float64
-
-	for i >= 0 {
-		c = &curves[i]
-		dx = c[6] - c[0]
-		dy = c[7] - c[1]
-
-		d2 = math.Abs(((c[2]-c[6])*dy - (c[3]-c[7])*dx))
-		d3 = math.Abs(((c[4]-c[6])*dy - (c[5]-c[7])*dx))
-
-		if (d2+d3)*(d2+d3) < flattening_threshold*(dx*dx+dy*dy) || i == len(curves)-1 {
-			t.LineTo(c[6], c[7])
-			i--
-		} else {
-			// second half of bezier go lower onto the stack
-			c.Subdivide(&curves[i+1], &curves[i])
-			i++
-		}
-	}
-}

curve/cubic_float64_others.go

@@ -1,696 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 17/05/2011 by Laurent Le Goff
-package curve
-
-import (
-	"math"
-)
-
-const (
-	CurveCollinearityEpsilon   = 1e-30
-	CurveAngleToleranceEpsilon = 0.01
-)
-
-//mu ranges from 0 to 1, start to end of curve
-func (c *CubicCurveFloat64) ArbitraryPoint(mu float64) (x, y float64) {
-
-	mum1 := 1 - mu
-	mum13 := mum1 * mum1 * mum1
-	mu3 := mu * mu * mu
-
-	x = mum13*c[0] + 3*mu*mum1*mum1*c[2] + 3*mu*mu*mum1*c[4] + mu3*c[6]
-	y = mum13*c[1] + 3*mu*mum1*mum1*c[3] + 3*mu*mu*mum1*c[5] + mu3*c[7]
-	return
-}
-
-func (c *CubicCurveFloat64) SubdivideAt(c1, c2 *CubicCurveFloat64, t float64) (x23, y23 float64) {
-	inv_t := (1 - t)
-	c1[0], c1[1] = c[0], c[1]
-	c2[6], c2[7] = c[6], c[7]
-
-	c1[2] = inv_t*c[0] + t*c[2]
-	c1[3] = inv_t*c[1] + t*c[3]
-
-	x23 = inv_t*c[2] + t*c[4]
-	y23 = inv_t*c[3] + t*c[5]
-
-	c2[4] = inv_t*c[4] + t*c[6]
-	c2[5] = inv_t*c[5] + t*c[7]
-
-	c1[4] = inv_t*c1[2] + t*x23
-	c1[5] = inv_t*c1[3] + t*y23
-
-	c2[2] = inv_t*x23 + t*c2[4]
-	c2[3] = inv_t*y23 + t*c2[5]
-
-	c1[6] = inv_t*c1[4] + t*c2[2]
-	c1[7] = inv_t*c1[5] + t*c2[3]
-
-	c2[0], c2[1] = c1[6], c1[7]
-	return
-}
-
-func (c *CubicCurveFloat64) EstimateDistance() float64 {
-	dx1 := c[2] - c[0]
-	dy1 := c[3] - c[1]
-	dx2 := c[4] - c[2]
-	dy2 := c[5] - c[3]
-	dx3 := c[6] - c[4]
-	dy3 := c[7] - c[5]
-	return math.Sqrt(dx1*dx1+dy1*dy1) + math.Sqrt(dx2*dx2+dy2*dy2) + math.Sqrt(dx3*dx3+dy3*dy3)
-}
-
-// subdivide the curve in straight lines using line approximation and Casteljau recursive subdivision
-func (c *CubicCurveFloat64) SegmentRec(t LineTracer, flattening_threshold float64) {
-	c.segmentRec(t, flattening_threshold)
-	t.LineTo(c[6], c[7])
-}
-
-func (c *CubicCurveFloat64) segmentRec(t LineTracer, flattening_threshold float64) {
-	var c1, c2 CubicCurveFloat64
-	c.Subdivide(&c1, &c2)
-
-	// Try to approximate the full cubic curve by a single straight line
-	//------------------
-	dx := c[6] - c[0]
-	dy := c[7] - c[1]
-
-	d2 := math.Abs(((c[2]-c[6])*dy - (c[3]-c[7])*dx))
-	d3 := math.Abs(((c[4]-c[6])*dy - (c[5]-c[7])*dx))
-
-	if (d2+d3)*(d2+d3) < flattening_threshold*(dx*dx+dy*dy) {
-		t.LineTo(c[6], c[7])
-		return
-	}
-	// Continue subdivision
-	//----------------------
-	c1.segmentRec(t, flattening_threshold)
-	c2.segmentRec(t, flattening_threshold)
-}
-
-/*
-	The function has the following parameters:
-		approximationScale :
-			Eventually determines the approximation accuracy. In practice we need to transform points from the World coordinate system to the Screen one.
-			It always has some scaling coefficient.
-			The curves are usually processed in the World coordinates, while the approximation accuracy should be eventually in pixels.
-			Usually it looks as follows:
-			curved.approximationScale(transform.scale());
-			where transform is the affine matrix that includes all the transformations, including viewport and zoom.
-		angleTolerance :
-			You set it in radians.
-			The less this value is the more accurate will be the approximation at sharp turns.
-			But 0 means that we don't consider angle conditions at all.
-		cuspLimit :
-			An angle in radians.
-			If 0, only the real cusps will have bevel cuts.
-			If more than 0, it will restrict the sharpness.
-			The more this value is the less sharp turns will be cut.
-			Typically it should not exceed 10-15 degrees.
-*/
-func (c *CubicCurveFloat64) AdaptiveSegmentRec(t LineTracer, approximationScale, angleTolerance, cuspLimit float64) {
-	cuspLimit = computeCuspLimit(cuspLimit)
-	distanceToleranceSquare := 0.5 / approximationScale
-	distanceToleranceSquare = distanceToleranceSquare * distanceToleranceSquare
-	c.adaptiveSegmentRec(t, 0, distanceToleranceSquare, angleTolerance, cuspLimit)
-	t.LineTo(c[6], c[7])
-}
-
-func computeCuspLimit(v float64) (r float64) {
-	if v == 0.0 {
-		r = 0.0
-	} else {
-		r = math.Pi - v
-	}
-	return
-}
-
-func squareDistance(x1, y1, x2, y2 float64) float64 {
-	dx := x2 - x1
-	dy := y2 - y1
-	return dx*dx + dy*dy
-}
-
-/**
- * http://www.antigrain.com/research/adaptive_bezier/index.html
- */
-func (c *CubicCurveFloat64) adaptiveSegmentRec(t LineTracer, level int, distanceToleranceSquare, angleTolerance, cuspLimit float64) {
-	if level > CurveRecursionLimit {
-		return
-	}
-	var c1, c2 CubicCurveFloat64
-	x23, y23 := c.Subdivide(&c1, &c2)
-
-	// Try to approximate the full cubic curve by a single straight line
-	//------------------
-	dx := c[6] - c[0]
-	dy := c[7] - c[1]
-
-	d2 := math.Abs(((c[2]-c[6])*dy - (c[3]-c[7])*dx))
-	d3 := math.Abs(((c[4]-c[6])*dy - (c[5]-c[7])*dx))
-	switch {
-	case d2 <= CurveCollinearityEpsilon && d3 <= CurveCollinearityEpsilon:
-		// All collinear OR p1==p4
-		//----------------------
-		k := dx*dx + dy*dy
-		if k == 0 {
-			d2 = squareDistance(c[0], c[1], c[2], c[3])
-			d3 = squareDistance(c[6], c[7], c[4], c[5])
-		} else {
-			k = 1 / k
-			da1 := c[2] - c[0]
-			da2 := c[3] - c[1]
-			d2 = k * (da1*dx + da2*dy)
-			da1 = c[4] - c[0]
-			da2 = c[5] - c[1]
-			d3 = k * (da1*dx + da2*dy)
-			if d2 > 0 && d2 < 1 && d3 > 0 && d3 < 1 {
-				// Simple collinear case, 1---2---3---4
-				// We can leave just two endpoints
-				return
-			}
-			if d2 <= 0 {
-				d2 = squareDistance(c[2], c[3], c[0], c[1])
-			} else if d2 >= 1 {
-				d2 = squareDistance(c[2], c[3], c[6], c[7])
-			} else {
-				d2 = squareDistance(c[2], c[3], c[0]+d2*dx, c[1]+d2*dy)
-			}
-
-			if d3 <= 0 {
-				d3 = squareDistance(c[4], c[5], c[0], c[1])
-			} else if d3 >= 1 {
-				d3 = squareDistance(c[4], c[5], c[6], c[7])
-			} else {
-				d3 = squareDistance(c[4], c[5], c[0]+d3*dx, c[1]+d3*dy)
-			}
-		}
-		if d2 > d3 {
-			if d2 < distanceToleranceSquare {
-				t.LineTo(c[2], c[3])
-				return
-			}
-		} else {
-			if d3 < distanceToleranceSquare {
-				t.LineTo(c[4], c[5])
-				return
-			}
-		}
-
-	case d2 <= CurveCollinearityEpsilon && d3 > CurveCollinearityEpsilon:
-		// p1,p2,p4 are collinear, p3 is significant
-		//----------------------
-		if d3*d3 <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				t.LineTo(x23, y23)
-				return
-			}
-
-			// Angle Condition
-			//----------------------
-			da1 := math.Abs(math.Atan2(c[7]-c[5], c[6]-c[4]) - math.Atan2(c[5]-c[3], c[4]-c[2]))
-			if da1 >= math.Pi {
-				da1 = 2*math.Pi - da1
-			}
-
-			if da1 < angleTolerance {
-				t.LineTo(c[2], c[3])
-				t.LineTo(c[4], c[5])
-				return
-			}
-
-			if cuspLimit != 0.0 {
-				if da1 > cuspLimit {
-					t.LineTo(c[4], c[5])
-					return
-				}
-			}
-		}
-
-	case d2 > CurveCollinearityEpsilon && d3 <= CurveCollinearityEpsilon:
-		// p1,p3,p4 are collinear, p2 is significant
-		//----------------------
-		if d2*d2 <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				t.LineTo(x23, y23)
-				return
-			}
-
-			// Angle Condition
-			//----------------------
-			da1 := math.Abs(math.Atan2(c[5]-c[3], c[4]-c[2]) - math.Atan2(c[3]-c[1], c[2]-c[0]))
-			if da1 >= math.Pi {
-				da1 = 2*math.Pi - da1
-			}
-
-			if da1 < angleTolerance {
-				t.LineTo(c[2], c[3])
-				t.LineTo(c[4], c[5])
-				return
-			}
-
-			if cuspLimit != 0.0 {
-				if da1 > cuspLimit {
-					t.LineTo(c[2], c[3])
-					return
-				}
-			}
-		}
-
-	case d2 > CurveCollinearityEpsilon && d3 > CurveCollinearityEpsilon:
-		// Regular case
-		//-----------------
-		if (d2+d3)*(d2+d3) <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			// If the curvature doesn't exceed the distanceTolerance value
-			// we tend to finish subdivisions.
-			//----------------------
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				t.LineTo(x23, y23)
-				return
-			}
-
-			// Angle & Cusp Condition
-			//----------------------
-			k := math.Atan2(c[5]-c[3], c[4]-c[2])
-			da1 := math.Abs(k - math.Atan2(c[3]-c[1], c[2]-c[0]))
-			da2 := math.Abs(math.Atan2(c[7]-c[5], c[6]-c[4]) - k)
-			if da1 >= math.Pi {
-				da1 = 2*math.Pi - da1
-			}
-			if da2 >= math.Pi {
-				da2 = 2*math.Pi - da2
-			}
-
-			if da1+da2 < angleTolerance {
-				// Finally we can stop the recursion
-				//----------------------
-				t.LineTo(x23, y23)
-				return
-			}
-
-			if cuspLimit != 0.0 {
-				if da1 > cuspLimit {
-					t.LineTo(c[2], c[3])
-					return
-				}
-
-				if da2 > cuspLimit {
-					t.LineTo(c[4], c[5])
-					return
-				}
-			}
-		}
-	}
-
-	// Continue subdivision
-	//----------------------
-	c1.adaptiveSegmentRec(t, level+1, distanceToleranceSquare, angleTolerance, cuspLimit)
-	c2.adaptiveSegmentRec(t, level+1, distanceToleranceSquare, angleTolerance, cuspLimit)
-
-}
-
-func (curve *CubicCurveFloat64) AdaptiveSegment(t LineTracer, approximationScale, angleTolerance, cuspLimit float64) {
-	cuspLimit = computeCuspLimit(cuspLimit)
-	distanceToleranceSquare := 0.5 / approximationScale
-	distanceToleranceSquare = distanceToleranceSquare * distanceToleranceSquare
-
-	var curves [CurveRecursionLimit]CubicCurveFloat64
-	curves[0] = *curve
-	i := 0
-	// current curve
-	var c *CubicCurveFloat64
-	var c1, c2 CubicCurveFloat64
-	var dx, dy, d2, d3, k, x23, y23 float64
-	for i >= 0 {
-		c = &curves[i]
-		x23, y23 = c.Subdivide(&c1, &c2)
-
-		// Try to approximate the full cubic curve by a single straight line
-		//------------------
-		dx = c[6] - c[0]
-		dy = c[7] - c[1]
-
-		d2 = math.Abs(((c[2]-c[6])*dy - (c[3]-c[7])*dx))
-		d3 = math.Abs(((c[4]-c[6])*dy - (c[5]-c[7])*dx))
-		switch {
-		case i == len(curves)-1:
-			t.LineTo(c[6], c[7])
-			i--
-			continue
-		case d2 <= CurveCollinearityEpsilon && d3 <= CurveCollinearityEpsilon:
-			// All collinear OR p1==p4
-			//----------------------
-			k = dx*dx + dy*dy
-			if k == 0 {
-				d2 = squareDistance(c[0], c[1], c[2], c[3])
-				d3 = squareDistance(c[6], c[7], c[4], c[5])
-			} else {
-				k = 1 / k
-				da1 := c[2] - c[0]
-				da2 := c[3] - c[1]
-				d2 = k * (da1*dx + da2*dy)
-				da1 = c[4] - c[0]
-				da2 = c[5] - c[1]
-				d3 = k * (da1*dx + da2*dy)
-				if d2 > 0 && d2 < 1 && d3 > 0 && d3 < 1 {
-					// Simple collinear case, 1---2---3---4
-					// We can leave just two endpoints
-					i--
-					continue
-				}
-				if d2 <= 0 {
-					d2 = squareDistance(c[2], c[3], c[0], c[1])
-				} else if d2 >= 1 {
-					d2 = squareDistance(c[2], c[3], c[6], c[7])
-				} else {
-					d2 = squareDistance(c[2], c[3], c[0]+d2*dx, c[1]+d2*dy)
-				}
-
-				if d3 <= 0 {
-					d3 = squareDistance(c[4], c[5], c[0], c[1])
-				} else if d3 >= 1 {
-					d3 = squareDistance(c[4], c[5], c[6], c[7])
-				} else {
-					d3 = squareDistance(c[4], c[5], c[0]+d3*dx, c[1]+d3*dy)
-				}
-			}
-			if d2 > d3 {
-				if d2 < distanceToleranceSquare {
-					t.LineTo(c[2], c[3])
-					i--
-					continue
-				}
-			} else {
-				if d3 < distanceToleranceSquare {
-					t.LineTo(c[4], c[5])
-					i--
-					continue
-				}
-			}
-
-		case d2 <= CurveCollinearityEpsilon && d3 > CurveCollinearityEpsilon:
-			// p1,p2,p4 are collinear, p3 is significant
-			//----------------------
-			if d3*d3 <= distanceToleranceSquare*(dx*dx+dy*dy) {
-				if angleTolerance < CurveAngleToleranceEpsilon {
-					t.LineTo(x23, y23)
-					i--
-					continue
-				}
-
-				// Angle Condition
-				//----------------------
-				da1 := math.Abs(math.Atan2(c[7]-c[5], c[6]-c[4]) - math.Atan2(c[5]-c[3], c[4]-c[2]))
-				if da1 >= math.Pi {
-					da1 = 2*math.Pi - da1
-				}
-
-				if da1 < angleTolerance {
-					t.LineTo(c[2], c[3])
-					t.LineTo(c[4], c[5])
-					i--
-					continue
-				}
-
-				if cuspLimit != 0.0 {
-					if da1 > cuspLimit {
-						t.LineTo(c[4], c[5])
-						i--
-						continue
-					}
-				}
-			}
-
-		case d2 > CurveCollinearityEpsilon && d3 <= CurveCollinearityEpsilon:
-			// p1,p3,p4 are collinear, p2 is significant
-			//----------------------
-			if d2*d2 <= distanceToleranceSquare*(dx*dx+dy*dy) {
-				if angleTolerance < CurveAngleToleranceEpsilon {
-					t.LineTo(x23, y23)
-					i--
-					continue
-				}
-
-				// Angle Condition
-				//----------------------
-				da1 := math.Abs(math.Atan2(c[5]-c[3], c[4]-c[2]) - math.Atan2(c[3]-c[1], c[2]-c[0]))
-				if da1 >= math.Pi {
-					da1 = 2*math.Pi - da1
-				}
-
-				if da1 < angleTolerance {
-					t.LineTo(c[2], c[3])
-					t.LineTo(c[4], c[5])
-					i--
-					continue
-				}
-
-				if cuspLimit != 0.0 {
-					if da1 > cuspLimit {
-						t.LineTo(c[2], c[3])
-						i--
-						continue
-					}
-				}
-			}
-
-		case d2 > CurveCollinearityEpsilon && d3 > CurveCollinearityEpsilon:
-			// Regular case
-			//-----------------
-			if (d2+d3)*(d2+d3) <= distanceToleranceSquare*(dx*dx+dy*dy) {
-				// If the curvature doesn't exceed the distanceTolerance value
-				// we tend to finish subdivisions.
-				//----------------------
-				if angleTolerance < CurveAngleToleranceEpsilon {
-					t.LineTo(x23, y23)
-					i--
-					continue
-				}
-
-				// Angle & Cusp Condition
-				//----------------------
-				k := math.Atan2(c[5]-c[3], c[4]-c[2])
-				da1 := math.Abs(k - math.Atan2(c[3]-c[1], c[2]-c[0]))
-				da2 := math.Abs(math.Atan2(c[7]-c[5], c[6]-c[4]) - k)
-				if da1 >= math.Pi {
-					da1 = 2*math.Pi - da1
-				}
-				if da2 >= math.Pi {
-					da2 = 2*math.Pi - da2
-				}
-
-				if da1+da2 < angleTolerance {
-					// Finally we can stop the recursion
-					//----------------------
-					t.LineTo(x23, y23)
-					i--
-					continue
-				}
-
-				if cuspLimit != 0.0 {
-					if da1 > cuspLimit {
-						t.LineTo(c[2], c[3])
-						i--
-						continue
-					}
-
-					if da2 > cuspLimit {
-						t.LineTo(c[4], c[5])
-						i--
-						continue
-					}
-				}
-			}
-		}
-
-		// Continue subdivision
-		//----------------------
-		curves[i+1], curves[i] = c1, c2
-		i++
-	}
-	t.LineTo(curve[6], curve[7])
-}
-
-/********************** Ahmad thesis *******************/
-
-/**************************************************************************************
-* This code is the implementation of the Parabolic Approximation (PA). Although *
-* it uses recursive subdivision as a safe net for the failing cases, this is an *
-* iterative routine and reduces considerably the number of vertices (point) *
-* generation. *
-**************************************************************************************/
-
-func (c *CubicCurveFloat64) ParabolicSegment(t LineTracer, flattening_threshold float64) {
-	estimatedIFP := c.numberOfInflectionPoints()
-	if estimatedIFP == 0 {
-		// If no inflection points then apply PA on the full Bezier segment.
-		c.doParabolicApproximation(t, flattening_threshold)
-		return
-	}
-	// If one or more inflection point then we will have to subdivide the curve
-	numOfIfP, t1, t2 := c.findInflectionPoints()
-	if numOfIfP == 2 {
-		// Case when 2 inflection points then divide at the smallest one first
-		var sub1, tmp1, sub2, sub3 CubicCurveFloat64
-		c.SubdivideAt(&sub1, &tmp1, t1)
-		// Now find the second inflection point in the second curve an subdivide
-		numOfIfP, t1, t2 = tmp1.findInflectionPoints()
-		if numOfIfP == 2 {
-			tmp1.SubdivideAt(&sub2, &sub3, t2)
-		} else if numOfIfP == 1 {
-			tmp1.SubdivideAt(&sub2, &sub3, t1)
-		} else {
-			return
-		}
-		// Use PA for first subsegment
-		sub1.doParabolicApproximation(t, flattening_threshold)
-		// Use RS for the second (middle) subsegment
-		sub2.Segment(t, flattening_threshold)
-		// Drop the last point in the array will be added by the PA in third subsegment
-		//noOfPoints--;
-		// Use PA for the third curve
-		sub3.doParabolicApproximation(t, flattening_threshold)
-	} else if numOfIfP == 1 {
-		// Case where there is one inflection point, subdivide once and use PA on
-		// both subsegments
-		var sub1, sub2 CubicCurveFloat64
-		c.SubdivideAt(&sub1, &sub2, t1)
-		sub1.doParabolicApproximation(t, flattening_threshold)
-		//noOfPoints--;
-		sub2.doParabolicApproximation(t, flattening_threshold)
-	} else {
-		// Case where there is no inflection USA PA directly
-		c.doParabolicApproximation(t, flattening_threshold)
-	}
-}
-
-// Find the third control point deviation form the axis
-func (c *CubicCurveFloat64) thirdControlPointDeviation() float64 {
-	dx := c[2] - c[0]
-	dy := c[3] - c[1]
-	l2 := dx*dx + dy*dy
-	if l2 == 0 {
-		return 0
-	}
-	l := math.Sqrt(l2)
-	r := (c[3] - c[1]) / l
-	s := (c[0] - c[2]) / l
-	u := (c[2]*c[1] - c[0]*c[3]) / l
-	return math.Abs(r*c[4] + s*c[5] + u)
-}
-
-// Find the number of inflection point
-func (c *CubicCurveFloat64) numberOfInflectionPoints() int {
-	dx21 := (c[2] - c[0])
-	dy21 := (c[3] - c[1])
-	dx32 := (c[4] - c[2])
-	dy32 := (c[5] - c[3])
-	dx43 := (c[6] - c[4])
-	dy43 := (c[7] - c[5])
-	if ((dx21*dy32 - dy21*dx32) * (dx32*dy43 - dy32*dx43)) < 0 {
-		return 1 // One inflection point
-	} else if ((dx21*dy32 - dy21*dx32) * (dx21*dy43 - dy21*dx43)) > 0 {
-		return 0 // No inflection point
-	} else {
-		// Most cases no inflection point
-		b1 := (dx21*dx32 + dy21*dy32) > 0
-		b2 := (dx32*dx43 + dy32*dy43) > 0
-		if b1 || b2 && !(b1 && b2) { // xor!!
-			return 0
-		}
-	}
-	return -1 // cases where there in zero or two inflection points
-}
-
-// This is the main function where all the work is done
-func (curve *CubicCurveFloat64) doParabolicApproximation(tracer LineTracer, flattening_threshold float64) {
-	var c *CubicCurveFloat64
-	c = curve
-	var d, t, dx, dy, d2, d3 float64
-	for {
-		dx = c[6] - c[0]
-		dy = c[7] - c[1]
-
-		d2 = math.Abs(((c[2]-c[6])*dy - (c[3]-c[7])*dx))
-		d3 = math.Abs(((c[4]-c[6])*dy - (c[5]-c[7])*dx))
-
-		if (d2+d3)*(d2+d3) < flattening_threshold*(dx*dx+dy*dy) {
-			// If the subsegment deviation satisfy the flatness then store the last
-			// point and stop
-			tracer.LineTo(c[6], c[7])
-			break
-		}
-		// Find the third control point deviation and the t values for subdivision
-		d = c.thirdControlPointDeviation()
-		t = 2 * math.Sqrt(flattening_threshold/d/3)
-		if t > 1 {
-			// Case where the t value calculated is invalid so using RS
-			c.Segment(tracer, flattening_threshold)
-			break
-		}
-		// Valid t value to subdivide at that calculated value
-		var b1, b2 CubicCurveFloat64
-		c.SubdivideAt(&b1, &b2, t)
-		// First subsegment should have its deviation equal to flatness
-		dx = b1[6] - b1[0]
-		dy = b1[7] - b1[1]
-
-		d2 = math.Abs(((b1[2]-b1[6])*dy - (b1[3]-b1[7])*dx))
-		d3 = math.Abs(((b1[4]-b1[6])*dy - (b1[5]-b1[7])*dx))
-
-		if (d2+d3)*(d2+d3) > flattening_threshold*(dx*dx+dy*dy) {
-			// if not then use RS to handle any mathematical errors
-			b1.Segment(tracer, flattening_threshold)
-		} else {
-			tracer.LineTo(b1[6], b1[7])
-		}
-		// repeat the process for the left over subsegment.
-		c = &b2
-	}
-}
-
-// Find the actual inflection points and return the number of inflection points found
-// if 2 inflection points found, the first one returned will be with smaller t value.
-func (curve *CubicCurveFloat64) findInflectionPoints() (int, firstIfp, secondIfp float64) {
-	// For Cubic Bezier curve with equation P=a*t^3 + b*t^2 + c*t + d
-	// slope of the curve dP/dt = 3*a*t^2 + 2*b*t + c
-	// a = (float)(-bez.p1 + 3*bez.p2 - 3*bez.p3 + bez.p4);
-	// b = (float)(3*bez.p1 - 6*bez.p2 + 3*bez.p3);
-	// c = (float)(-3*bez.p1 + 3*bez.p2);
-	ax := (-curve[0] + 3*curve[2] - 3*curve[4] + curve[6])
-	bx := (3*curve[0] - 6*curve[2] + 3*curve[4])
-	cx := (-3*curve[0] + 3*curve[2])
-	ay := (-curve[1] + 3*curve[3] - 3*curve[5] + curve[7])
-	by := (3*curve[1] - 6*curve[3] + 3*curve[5])
-	cy := (-3*curve[1] + 3*curve[3])
-	a := (3 * (ay*bx - ax*by))
-	b := (3 * (ay*cx - ax*cy))
-	c := (by*cx - bx*cy)
-	r2 := (b*b - 4*a*c)
-	firstIfp = 0.0
-	secondIfp = 0.0
-	if r2 >= 0.0 && a != 0.0 {
-		r := math.Sqrt(r2)
-		firstIfp = ((-b + r) / (2 * a))
-		secondIfp = ((-b - r) / (2 * a))
-		if (firstIfp > 0.0 && firstIfp < 1.0) && (secondIfp > 0.0 && secondIfp < 1.0) {
-			if firstIfp > secondIfp {
-				tmp := firstIfp
-				firstIfp = secondIfp
-				secondIfp = tmp
-			}
-			if secondIfp-firstIfp > 0.00001 {
-				return 2, firstIfp, secondIfp
-			} else {
-				return 1, firstIfp, secondIfp
-			}
-		} else if firstIfp > 0.0 && firstIfp < 1.0 {
-			return 1, firstIfp, secondIfp
-		} else if secondIfp > 0.0 && secondIfp < 1.0 {
-			firstIfp = secondIfp
-			return 1, firstIfp, secondIfp
-		}
-		return 0, firstIfp, secondIfp
-	}
-	return 0, firstIfp, secondIfp
-}

curve/curve_test.go

@@ -1,263 +0,0 @@
-package curve
-
-import (
-	"bufio"
-	"fmt"
-	"image"
-	"image/color"
-	"image/draw"
-	"image/png"
-	"log"
-	"os"
-	"testing"
-
-	"gopkg.in/llgcode/draw2d.v1/raster"
-)
-
-var (
-	flatteningThreshold = 0.5
-	testsCubicFloat64   = []CubicCurveFloat64{
-		CubicCurveFloat64{100, 100, 200, 100, 100, 200, 200, 200},
-		CubicCurveFloat64{100, 100, 300, 200, 200, 200, 300, 100},
-		CubicCurveFloat64{100, 100, 0, 300, 200, 0, 300, 300},
-		CubicCurveFloat64{150, 290, 10, 10, 290, 10, 150, 290},
-		CubicCurveFloat64{10, 290, 10, 10, 290, 10, 290, 290},
-		CubicCurveFloat64{100, 290, 290, 10, 10, 10, 200, 290},
-	}
-	testsQuadFloat64 = []QuadCurveFloat64{
-		QuadCurveFloat64{100, 100, 200, 100, 200, 200},
-		QuadCurveFloat64{100, 100, 290, 200, 290, 100},
-		QuadCurveFloat64{100, 100, 0, 290, 200, 290},
-		QuadCurveFloat64{150, 290, 10, 10, 290, 290},
-		QuadCurveFloat64{10, 290, 10, 10, 290, 290},
-		QuadCurveFloat64{100, 290, 290, 10, 120, 290},
-	}
-)
-
-type Path struct {
-	points []float64
-}
-
-func (p *Path) LineTo(x, y float64) {
-	if len(p.points)+2 > cap(p.points) {
-		points := make([]float64, len(p.points)+2, len(p.points)+32)
-		copy(points, p.points)
-		p.points = points
-	} else {
-		p.points = p.points[0 : len(p.points)+2]
-	}
-	p.points[len(p.points)-2] = x
-	p.points[len(p.points)-1] = y
-}
-
-func init() {
-	f, err := os.Create("../output/curve/test.html")
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-	defer f.Close()
-	log.Printf("Create html viewer")
-	f.Write([]byte("<html><body>"))
-	for i := 0; i < len(testsCubicFloat64); i++ {
-		f.Write([]byte(fmt.Sprintf("<div><img src='testRec%d.png'/>\n<img src='test%d.png'/>\n<img src='testAdaptiveRec%d.png'/>\n<img src='testAdaptive%d.png'/>\n<img src='testParabolic%d.png'/>\n</div>\n", i, i, i, i, i)))
-	}
-	for i := 0; i < len(testsQuadFloat64); i++ {
-		f.Write([]byte(fmt.Sprintf("<div><img src='testQuad%d.png'/>\n</div>\n", i)))
-	}
-	f.Write([]byte("</body></html>"))
-
-}
-
-func savepng(filePath string, m image.Image) {
-	f, err := os.Create(filePath)
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-	defer f.Close()
-	b := bufio.NewWriter(f)
-	err = png.Encode(b, m)
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-	err = b.Flush()
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-}
-
-func drawPoints(img draw.Image, c color.Color, s ...float64) image.Image {
-	/*for i := 0; i < len(s); i += 2 {
-		x, y := int(s[i]+0.5), int(s[i+1]+0.5)
-		img.Set(x, y, c)
-		img.Set(x, y+1, c)
-		img.Set(x, y-1, c)
-		img.Set(x+1, y, c)
-		img.Set(x+1, y+1, c)
-		img.Set(x+1, y-1, c)
-		img.Set(x-1, y, c)
-		img.Set(x-1, y+1, c)
-		img.Set(x-1, y-1, c)
-
-	}*/
-	return img
-}
-
-func TestCubicCurveRec(t *testing.T) {
-	for i, curve := range testsCubicFloat64 {
-		var p Path
-		p.LineTo(curve[0], curve[1])
-		curve.SegmentRec(&p, flatteningThreshold)
-		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
-		raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
-		raster.PolylineBresenham(img, image.Black, p.points...)
-		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
-		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
-		savepng(fmt.Sprintf("../output/curve/testRec%d.png", i), img)
-		log.Printf("Num of points: %d\n", len(p.points))
-	}
-	fmt.Println()
-}
-
-func TestCubicCurve(t *testing.T) {
-	for i, curve := range testsCubicFloat64 {
-		var p Path
-		p.LineTo(curve[0], curve[1])
-		curve.Segment(&p, flatteningThreshold)
-		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
-		raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
-		raster.PolylineBresenham(img, image.Black, p.points...)
-		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
-		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
-		savepng(fmt.Sprintf("../output/curve/test%d.png", i), img)
-		log.Printf("Num of points: %d\n", len(p.points))
-	}
-	fmt.Println()
-}
-
-func TestCubicCurveAdaptiveRec(t *testing.T) {
-	for i, curve := range testsCubicFloat64 {
-		var p Path
-		p.LineTo(curve[0], curve[1])
-		curve.AdaptiveSegmentRec(&p, 1, 0, 0)
-		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
-		raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
-		raster.PolylineBresenham(img, image.Black, p.points...)
-		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
-		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
-		savepng(fmt.Sprintf("../output/curve/testAdaptiveRec%d.png", i), img)
-		log.Printf("Num of points: %d\n", len(p.points))
-	}
-	fmt.Println()
-}
-
-func TestCubicCurveAdaptive(t *testing.T) {
-	for i, curve := range testsCubicFloat64 {
-		var p Path
-		p.LineTo(curve[0], curve[1])
-		curve.AdaptiveSegment(&p, 1, 0, 0)
-		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
-		raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
-		raster.PolylineBresenham(img, image.Black, p.points...)
-		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
-		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
-		savepng(fmt.Sprintf("../output/curve/testAdaptive%d.png", i), img)
-		log.Printf("Num of points: %d\n", len(p.points))
-	}
-	fmt.Println()
-}
-
-func TestCubicCurveParabolic(t *testing.T) {
-	for i, curve := range testsCubicFloat64 {
-		var p Path
-		p.LineTo(curve[0], curve[1])
-		curve.ParabolicSegment(&p, flatteningThreshold)
-		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
-		raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
-		raster.PolylineBresenham(img, image.Black, p.points...)
-		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
-		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
-		savepng(fmt.Sprintf("../output/curve/testParabolic%d.png", i), img)
-		log.Printf("Num of points: %d\n", len(p.points))
-	}
-	fmt.Println()
-}
-
-func TestQuadCurve(t *testing.T) {
-	for i, curve := range testsQuadFloat64 {
-		var p Path
-		p.LineTo(curve[0], curve[1])
-		curve.Segment(&p, flatteningThreshold)
-		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
-		raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
-		raster.PolylineBresenham(img, image.Black, p.points...)
-		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
-		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
-		savepng(fmt.Sprintf("../output/curve/testQuad%d.png", i), img)
-		log.Printf("Num of points: %d\n", len(p.points))
-	}
-	fmt.Println()
-}
-
-func BenchmarkCubicCurveRec(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		for _, curve := range testsCubicFloat64 {
-			p := Path{make([]float64, 0, 32)}
-			p.LineTo(curve[0], curve[1])
-			curve.SegmentRec(&p, flatteningThreshold)
-		}
-	}
-}
-
-func BenchmarkCubicCurve(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		for _, curve := range testsCubicFloat64 {
-			p := Path{make([]float64, 0, 32)}
-			p.LineTo(curve[0], curve[1])
-			curve.Segment(&p, flatteningThreshold)
-		}
-	}
-}
-
-func BenchmarkCubicCurveAdaptiveRec(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		for _, curve := range testsCubicFloat64 {
-			p := Path{make([]float64, 0, 32)}
-			p.LineTo(curve[0], curve[1])
-			curve.AdaptiveSegmentRec(&p, 1, 0, 0)
-		}
-	}
-}
-
-func BenchmarkCubicCurveAdaptive(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		for _, curve := range testsCubicFloat64 {
-			p := Path{make([]float64, 0, 32)}
-			p.LineTo(curve[0], curve[1])
-			curve.AdaptiveSegment(&p, 1, 0, 0)
-		}
-	}
-}
-
-func BenchmarkCubicCurveParabolic(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		for _, curve := range testsCubicFloat64 {
-			p := Path{make([]float64, 0, 32)}
-			p.LineTo(curve[0], curve[1])
-			curve.ParabolicSegment(&p, flatteningThreshold)
-		}
-	}
-}
-
-func BenchmarkQuadCurve(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		for _, curve := range testsQuadFloat64 {
-			p := Path{make([]float64, 0, 32)}
-			p.LineTo(curve[0], curve[1])
-			curve.Segment(&p, flatteningThreshold)
-		}
-	}
-}

curve/quad_float64.go

@@ -1,51 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 17/05/2011 by Laurent Le Goff
-package curve
-
-import (
-	"math"
-)
-
-//X1, Y1, X2, Y2, X3, Y3 float64
-type QuadCurveFloat64 [6]float64
-
-func (c *QuadCurveFloat64) Subdivide(c1, c2 *QuadCurveFloat64) {
-	// Calculate all the mid-points of the line segments
-	//----------------------
-	c1[0], c1[1] = c[0], c[1]
-	c2[4], c2[5] = c[4], c[5]
-	c1[2] = (c[0] + c[2]) / 2
-	c1[3] = (c[1] + c[3]) / 2
-	c2[2] = (c[2] + c[4]) / 2
-	c2[3] = (c[3] + c[5]) / 2
-	c1[4] = (c1[2] + c2[2]) / 2
-	c1[5] = (c1[3] + c2[3]) / 2
-	c2[0], c2[1] = c1[4], c1[5]
-	return
-}
-
-func (curve *QuadCurveFloat64) Segment(t LineTracer, flattening_threshold float64) {
-	var curves [CurveRecursionLimit]QuadCurveFloat64
-	curves[0] = *curve
-	i := 0
-	// current curve
-	var c *QuadCurveFloat64
-	var dx, dy, d float64
-
-	for i >= 0 {
-		c = &curves[i]
-		dx = c[4] - c[0]
-		dy = c[5] - c[1]
-
-		d = math.Abs(((c[2]-c[4])*dy - (c[3]-c[5])*dx))
-
-		if (d*d) < flattening_threshold*(dx*dx+dy*dy) || i == len(curves)-1 {
-			t.LineTo(c[4], c[5])
-			i--
-		} else {
-			// second half of bezier go lower onto the stack
-			c.Subdivide(&curves[i+1], &curves[i])
-			i++
-		}
-	}
-}

curves.go

@@ -1,336 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"math"
-)
-
-var (
-	CurveRecursionLimit        = 32
-	CurveCollinearityEpsilon   = 1e-30
-	CurveAngleToleranceEpsilon = 0.01
-)
-
-/*
-	The function has the following parameters:
-		approximationScale :
-			Eventually determines the approximation accuracy. In practice we need to transform points from the World coordinate system to the Screen one.
-			It always has some scaling coefficient.
-			The curves are usually processed in the World coordinates, while the approximation accuracy should be eventually in pixels.
-			Usually it looks as follows:
-			curved.approximationScale(transform.scale());
-			where transform is the affine matrix that includes all the transformations, including viewport and zoom.
-		angleTolerance :
-			You set it in radians.
-			The less this value is the more accurate will be the approximation at sharp turns.
-			But 0 means that we don't consider angle conditions at all.
-		cuspLimit :
-			An angle in radians.
-			If 0, only the real cusps will have bevel cuts.
-			If more than 0, it will restrict the sharpness.
-			The more this value is the less sharp turns will be cut.
-			Typically it should not exceed 10-15 degrees.
-*/
-func cubicBezier(v VertexConverter, x1, y1, x2, y2, x3, y3, x4, y4, approximationScale, angleTolerance, cuspLimit float64) {
-	cuspLimit = computeCuspLimit(cuspLimit)
-	distanceToleranceSquare := 0.5 / approximationScale
-	distanceToleranceSquare = distanceToleranceSquare * distanceToleranceSquare
-	recursiveCubicBezier(v, x1, y1, x2, y2, x3, y3, x4, y4, 0, distanceToleranceSquare, angleTolerance, cuspLimit)
-}
-
-/*
- * see cubicBezier comments for approximationScale and angleTolerance definition
- */
-func quadraticBezier(v VertexConverter, x1, y1, x2, y2, x3, y3, approximationScale, angleTolerance float64) {
-	distanceToleranceSquare := 0.5 / approximationScale
-	distanceToleranceSquare = distanceToleranceSquare * distanceToleranceSquare
-
-	recursiveQuadraticBezierBezier(v, x1, y1, x2, y2, x3, y3, 0, distanceToleranceSquare, angleTolerance)
-}
-
-func computeCuspLimit(v float64) (r float64) {
-	if v == 0.0 {
-		r = 0.0
-	} else {
-		r = math.Pi - v
-	}
-	return
-}
-
-/**
- * http://www.antigrain.com/research/adaptive_bezier/index.html
- */
-func recursiveQuadraticBezierBezier(v VertexConverter, x1, y1, x2, y2, x3, y3 float64, level int, distanceToleranceSquare, angleTolerance float64) {
-	if level > CurveRecursionLimit {
-		return
-	}
-
-	// Calculate all the mid-points of the line segments
-	//----------------------
-	x12 := (x1 + x2) / 2
-	y12 := (y1 + y2) / 2
-	x23 := (x2 + x3) / 2
-	y23 := (y2 + y3) / 2
-	x123 := (x12 + x23) / 2
-	y123 := (y12 + y23) / 2
-
-	dx := x3 - x1
-	dy := y3 - y1
-	d := math.Abs(((x2-x3)*dy - (y2-y3)*dx))
-
-	if d > CurveCollinearityEpsilon {
-		// Regular case
-		//-----------------
-		if d*d <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			// If the curvature doesn't exceed the distanceTolerance value
-			// we tend to finish subdivisions.
-			//----------------------
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				v.Vertex(x123, y123)
-				return
-			}
-
-			// Angle & Cusp Condition
-			//----------------------
-			da := math.Abs(math.Atan2(y3-y2, x3-x2) - math.Atan2(y2-y1, x2-x1))
-			if da >= math.Pi {
-				da = 2*math.Pi - da
-			}
-
-			if da < angleTolerance {
-				// Finally we can stop the recursion
-				//----------------------
-				v.Vertex(x123, y123)
-				return
-			}
-		}
-	} else {
-		// Collinear case
-		//------------------
-		da := dx*dx + dy*dy
-		if da == 0 {
-			d = squareDistance(x1, y1, x2, y2)
-		} else {
-			d = ((x2-x1)*dx + (y2-y1)*dy) / da
-			if d > 0 && d < 1 {
-				// Simple collinear case, 1---2---3
-				// We can leave just two endpoints
-				return
-			}
-			if d <= 0 {
-				d = squareDistance(x2, y2, x1, y1)
-			} else if d >= 1 {
-				d = squareDistance(x2, y2, x3, y3)
-			} else {
-				d = squareDistance(x2, y2, x1+d*dx, y1+d*dy)
-			}
-		}
-		if d < distanceToleranceSquare {
-			v.Vertex(x2, y2)
-			return
-		}
-	}
-
-	// Continue subdivision
-	//----------------------
-	recursiveQuadraticBezierBezier(v, x1, y1, x12, y12, x123, y123, level+1, distanceToleranceSquare, angleTolerance)
-	recursiveQuadraticBezierBezier(v, x123, y123, x23, y23, x3, y3, level+1, distanceToleranceSquare, angleTolerance)
-}
-
-/**
- * http://www.antigrain.com/research/adaptive_bezier/index.html
- */
-func recursiveCubicBezier(v VertexConverter, x1, y1, x2, y2, x3, y3, x4, y4 float64, level int, distanceToleranceSquare, angleTolerance, cuspLimit float64) {
-	if level > CurveRecursionLimit {
-		return
-	}
-
-	// Calculate all the mid-points of the line segments
-	//----------------------
-	x12 := (x1 + x2) / 2
-	y12 := (y1 + y2) / 2
-	x23 := (x2 + x3) / 2
-	y23 := (y2 + y3) / 2
-	x34 := (x3 + x4) / 2
-	y34 := (y3 + y4) / 2
-	x123 := (x12 + x23) / 2
-	y123 := (y12 + y23) / 2
-	x234 := (x23 + x34) / 2
-	y234 := (y23 + y34) / 2
-	x1234 := (x123 + x234) / 2
-	y1234 := (y123 + y234) / 2
-
-	// Try to approximate the full cubic curve by a single straight line
-	//------------------
-	dx := x4 - x1
-	dy := y4 - y1
-
-	d2 := math.Abs(((x2-x4)*dy - (y2-y4)*dx))
-	d3 := math.Abs(((x3-x4)*dy - (y3-y4)*dx))
-
-	switch {
-	case d2 <= CurveCollinearityEpsilon && d3 <= CurveCollinearityEpsilon:
-		// All collinear OR p1==p4
-		//----------------------
-		k := dx*dx + dy*dy
-		if k == 0 {
-			d2 = squareDistance(x1, y1, x2, y2)
-			d3 = squareDistance(x4, y4, x3, y3)
-		} else {
-			k = 1 / k
-			da1 := x2 - x1
-			da2 := y2 - y1
-			d2 = k * (da1*dx + da2*dy)
-			da1 = x3 - x1
-			da2 = y3 - y1
-			d3 = k * (da1*dx + da2*dy)
-			if d2 > 0 && d2 < 1 && d3 > 0 && d3 < 1 {
-				// Simple collinear case, 1---2---3---4
-				// We can leave just two endpoints
-				return
-			}
-			if d2 <= 0 {
-				d2 = squareDistance(x2, y2, x1, y1)
-			} else if d2 >= 1 {
-				d2 = squareDistance(x2, y2, x4, y4)
-			} else {
-				d2 = squareDistance(x2, y2, x1+d2*dx, y1+d2*dy)
-			}
-
-			if d3 <= 0 {
-				d3 = squareDistance(x3, y3, x1, y1)
-			} else if d3 >= 1 {
-				d3 = squareDistance(x3, y3, x4, y4)
-			} else {
-				d3 = squareDistance(x3, y3, x1+d3*dx, y1+d3*dy)
-			}
-		}
-		if d2 > d3 {
-			if d2 < distanceToleranceSquare {
-				v.Vertex(x2, y2)
-				return
-			}
-		} else {
-			if d3 < distanceToleranceSquare {
-				v.Vertex(x3, y3)
-				return
-			}
-		}
-		break
-
-	case d2 <= CurveCollinearityEpsilon && d3 > CurveCollinearityEpsilon:
-		// p1,p2,p4 are collinear, p3 is significant
-		//----------------------
-		if d3*d3 <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				v.Vertex(x23, y23)
-				return
-			}
-
-			// Angle Condition
-			//----------------------
-			da1 := math.Abs(math.Atan2(y4-y3, x4-x3) - math.Atan2(y3-y2, x3-x2))
-			if da1 >= math.Pi {
-				da1 = 2*math.Pi - da1
-			}
-
-			if da1 < angleTolerance {
-				v.Vertex(x2, y2)
-				v.Vertex(x3, y3)
-				return
-			}
-
-			if cuspLimit != 0.0 {
-				if da1 > cuspLimit {
-					v.Vertex(x3, y3)
-					return
-				}
-			}
-		}
-		break
-
-	case d2 > CurveCollinearityEpsilon && d3 <= CurveCollinearityEpsilon:
-		// p1,p3,p4 are collinear, p2 is significant
-		//----------------------
-		if d2*d2 <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				v.Vertex(x23, y23)
-				return
-			}
-
-			// Angle Condition
-			//----------------------
-			da1 := math.Abs(math.Atan2(y3-y2, x3-x2) - math.Atan2(y2-y1, x2-x1))
-			if da1 >= math.Pi {
-				da1 = 2*math.Pi - da1
-			}
-
-			if da1 < angleTolerance {
-				v.Vertex(x2, y2)
-				v.Vertex(x3, y3)
-				return
-			}
-
-			if cuspLimit != 0.0 {
-				if da1 > cuspLimit {
-					v.Vertex(x2, y2)
-					return
-				}
-			}
-		}
-		break
-
-	case d2 > CurveCollinearityEpsilon && d3 > CurveCollinearityEpsilon:
-		// Regular case
-		//-----------------
-		if (d2+d3)*(d2+d3) <= distanceToleranceSquare*(dx*dx+dy*dy) {
-			// If the curvature doesn't exceed the distanceTolerance value
-			// we tend to finish subdivisions.
-			//----------------------
-			if angleTolerance < CurveAngleToleranceEpsilon {
-				v.Vertex(x23, y23)
-				return
-			}
-
-			// Angle & Cusp Condition
-			//----------------------
-			k := math.Atan2(y3-y2, x3-x2)
-			da1 := math.Abs(k - math.Atan2(y2-y1, x2-x1))
-			da2 := math.Abs(math.Atan2(y4-y3, x4-x3) - k)
-			if da1 >= math.Pi {
-				da1 = 2*math.Pi - da1
-			}
-			if da2 >= math.Pi {
-				da2 = 2*math.Pi - da2
-			}
-
-			if da1+da2 < angleTolerance {
-				// Finally we can stop the recursion
-				//----------------------
-				v.Vertex(x23, y23)
-				return
-			}
-
-			if cuspLimit != 0.0 {
-				if da1 > cuspLimit {
-					v.Vertex(x2, y2)
-					return
-				}
-
-				if da2 > cuspLimit {
-					v.Vertex(x3, y3)
-					return
-				}
-			}
-		}
-		break
-	}
-
-	// Continue subdivision
-	//----------------------
-	recursiveCubicBezier(v, x1, y1, x12, y12, x123, y123, x1234, y1234, level+1, distanceToleranceSquare, angleTolerance, cuspLimit)
-	recursiveCubicBezier(v, x1234, y1234, x234, y234, x34, y34, x4, y4, level+1, distanceToleranceSquare, angleTolerance, cuspLimit)
-
-}

demux_converter.go

@@ -1,23 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 13/12/2010 by Laurent Le Goff
-
-package draw2d
-
-type DemuxConverter struct {
-	converters []VertexConverter
-}
-
-func NewDemuxConverter(converters ...VertexConverter) *DemuxConverter {
-	return &DemuxConverter{converters}
-}
-
-func (dc *DemuxConverter) NextCommand(cmd VertexCommand) {
-	for _, converter := range dc.converters {
-		converter.NextCommand(cmd)
-	}
-}
-func (dc *DemuxConverter) Vertex(x, y float64) {
-	for _, converter := range dc.converters {
-		converter.Vertex(x, y)
-	}
-}

draw2d.go

@@ -19,34 +19,45 @@
 // Installation
 //
 // To install or update the package draw2d on your system, run:
-//   go get -u gopkg.in/llgcode/draw2d.v1
+//   go get -u github.com/llgcode/draw2d
 //
 // Quick Start
 //
 // Package draw2d itself provides a graphic context that can draw vector
 // graphics and text on an image canvas. The following Go code
 // generates a simple drawing and saves it to an image file:
-//   // Initialize the graphic context on an RGBA image
+//		package main
-//   dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
-//   gc := draw2d.NewGraphicContext(dest)
 //
-//   // Set some properties
+// 		import (
-//   gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
+// 			"github.com/llgcode/draw2d/draw2dimg"
-//   gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
+// 			"image"
-//   gc.SetLineWidth(5)
+// 			"image/color"
+// 		)
 //
-//   // Draw a closed shape
+// 		func main() {
-//   gc.MoveTo(10, 10) // should always be called first for a new path
+// 			// Initialize the graphic context on an RGBA image
-//   gc.LineTo(100, 50)
+// 			dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
-//   gc.QuadCurveTo(100, 10, 10, 10)
+// 			gc := draw2dimg.NewGraphicContext(dest)
-//   gc.Close()
+//
-//   gc.FillStroke()
+// 			// Set some properties
+// 			gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
+// 			gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
+// 			gc.SetLineWidth(5)
+//
+// 			// Draw a closed shape
+// 			gc.MoveTo(10, 10) // should always be called first for a new path
+// 			gc.LineTo(100, 50)
+// 			gc.QuadCurveTo(100, 10, 10, 10)
+// 			gc.Close()
+// 			gc.FillStroke()
+//
+// 			// Save to file
+// 			draw2dimg.SaveToPngFile("hello.png", dest)
+// 		}
 //
-//   // Save to file
-//   draw2d.SaveToPngFile("hello.png", dest)
 //
 // There are more examples here:
-// https://gopkg.in/llgcode/draw2d.v1/tree/master/samples
+// https://github.com/llgcode/draw2d/tree/master/samples
 //
 // Drawing on pdf documents is provided by the draw2dpdf package.
 // Drawing on opengl is provided by the draw2dgl package.
@@ -83,3 +94,162 @@
 //
 // - https://github.com/vdobler/chart: basic charts in Go
 package draw2d
+
+import "image/color"
+
+// FillRule defines the type for fill rules
+type FillRule int
+
+const (
+	// FillRuleEvenOdd determines the "insideness" of a point in the shape
+	// by drawing a ray from that point to infinity in any direction
+	// and counting the number of path segments from the given shape that the ray crosses.
+	// If this number is odd, the point is inside; if even, the point is outside.
+	FillRuleEvenOdd FillRule = iota
+	// FillRuleWinding determines the "insideness" of a point in the shape
+	// by drawing a ray from that point to infinity in any direction
+	// and then examining the places where a segment of the shape crosses the ray.
+	// Starting with a count of zero, add one each time a path segment crosses
+	// the ray from left to right and subtract one each time
+	// a path segment crosses the ray from right to left. After counting the crossings,
+	// if the result is zero then the point is outside the path. Otherwise, it is inside.
+	FillRuleWinding
+)
+
+// LineCap is the style of line extremities
+type LineCap int
+
+const (
+	// RoundCap defines a rounded shape at the end of the line
+	RoundCap LineCap = iota
+	// ButtCap defines a squared shape exactly at the end of the line
+	ButtCap
+	// SquareCap defines a squared shape at the end of the line
+	SquareCap
+)
+
+func (cap LineCap) String() string {
+	return map[LineCap]string{
+		RoundCap:  "round",
+		ButtCap:   "cap",
+		SquareCap: "square",
+	}[cap]
+}
+
+// LineJoin is the style of segments joint
+type LineJoin int
+
+const (
+	// BevelJoin represents cut segments joint
+	BevelJoin LineJoin = iota
+	// RoundJoin represents rounded segments joint
+	RoundJoin
+	// MiterJoin represents peaker segments joint
+	MiterJoin
+)
+
+func (join LineJoin) String() string {
+	return map[LineJoin]string{
+		RoundJoin: "round",
+		BevelJoin: "bevel",
+		MiterJoin: "miter",
+	}[join]
+}
+
+// StrokeStyle keeps stroke style attributes
+// that is used by the Stroke method of a Drawer
+type StrokeStyle struct {
+	// Color defines the color of stroke
+	Color color.Color
+	// Line width
+	Width float64
+	// Line cap style rounded, butt or square
+	LineCap LineCap
+	// Line join style bevel, round or miter
+	LineJoin LineJoin
+	// offset of the first dash
+	DashOffset float64
+	// array represented dash length pair values are plain dash and impair are space between dash
+	// if empty display plain line
+	Dash []float64
+}
+
+// SolidFillStyle define style attributes for a solid fill style
+type SolidFillStyle struct {
+	// Color defines the line color
+	Color color.Color
+	// FillRule defines the file rule to used
+	FillRule FillRule
+}
+
+// Valign Vertical Alignment of the text
+type Valign int
+
+const (
+	// ValignTop top align text
+	ValignTop Valign = iota
+	// ValignCenter centered text
+	ValignCenter
+	// ValignBottom bottom aligned text
+	ValignBottom
+	// ValignBaseline align text with the baseline of the font
+	ValignBaseline
+)
+
+// Halign Horizontal Alignment of the text
+type Halign int
+
+const (
+	// HalignLeft Horizontally align to left
+	HalignLeft = iota
+	// HalignCenter Horizontally align to center
+	HalignCenter
+	// HalignRight Horizontally align to right
+	HalignRight
+)
+
+// TextStyle describe text property
+type TextStyle struct {
+	// Color defines the color of text
+	Color color.Color
+	// Size font size
+	Size float64
+	// The font to use
+	Font FontData
+	// Horizontal Alignment of the text
+	Halign Halign
+	// Vertical Alignment of the text
+	Valign Valign
+}
+
+// ScalingPolicy is a constant to define how to scale an image
+type ScalingPolicy int
+
+const (
+	// ScalingNone no scaling applied
+	ScalingNone ScalingPolicy = iota
+	// ScalingStretch the image is stretched so that its width and height are exactly the given width and height
+	ScalingStretch
+	// ScalingWidth the image is scaled so that its width is exactly the given width
+	ScalingWidth
+	// ScalingHeight the image is scaled so that its height is exactly the given height
+	ScalingHeight
+	// ScalingFit the image is scaled to the largest scale that allow the image to fit within a rectangle width x height
+	ScalingFit
+	// ScalingSameArea the image is scaled so that its area is exactly the area of the given rectangle width x height
+	ScalingSameArea
+	// ScalingFill the image is scaled to the smallest scale that allow the image to fully cover a rectangle width x height
+	ScalingFill
+)
+
+// ImageScaling style attributes used to display the image
+type ImageScaling struct {
+	// Horizontal Alignment of the image
+	Halign Halign
+	// Vertical Alignment of the image
+	Valign Valign
+	// Width Height used by scaling policy
+	Width, Height float64
+	// ScalingPolicy defines the scaling policy to applied to the image
+	ScalingPolicy ScalingPolicy
+}

draw2dbase/README.md

@@ -0,0 +1,7 @@
+draw2d/draw2dbase
+=================
+
+[![Coverage](http://gocover.io/_badge/github.com/llgcode/draw2d/draw2dbase?0)](http://gocover.io/github.com/llgcode/draw2d/draw2dbase)
+[![GoDoc](https://godoc.org/github.com/llgcode/draw2d/draw2dbase?status.svg)](https://godoc.org/github.com/llgcode/draw2d/draw2dbase)
+
+Base package implementation that is used by pdf, svg, img, gl implementations.

draw2dbase/curve.go

@@ -0,0 +1,172 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 17/05/2011 by Laurent Le Goff
+
+package draw2dbase
+
+import (
+	"errors"
+	"math"
+)
+
+const (
+	// CurveRecursionLimit represents the maximum recursion that is really necessary to subsivide a curve into straight lines
+	CurveRecursionLimit = 32
+)
+
+// Cubic
+//	x1, y1, cpx1, cpy1, cpx2, cpy2, x2, y2 float64
+
+// SubdivideCubic a Bezier cubic curve in 2 equivalents Bezier cubic curves.
+// c1 and c2 parameters are the resulting curves
+// length of c, c1 and c2 must be 8 otherwise it panics.
+func SubdivideCubic(c, c1, c2 []float64) {
+	// First point of c is the first point of c1
+	c1[0], c1[1] = c[0], c[1]
+	// Last point of c is the last point of c2
+	c2[6], c2[7] = c[6], c[7]
+
+	// Subdivide segment using midpoints
+	c1[2] = (c[0] + c[2]) / 2
+	c1[3] = (c[1] + c[3]) / 2
+
+	midX := (c[2] + c[4]) / 2
+	midY := (c[3] + c[5]) / 2
+
+	c2[4] = (c[4] + c[6]) / 2
+	c2[5] = (c[5] + c[7]) / 2
+
+	c1[4] = (c1[2] + midX) / 2
+	c1[5] = (c1[3] + midY) / 2
+
+	c2[2] = (midX + c2[4]) / 2
+	c2[3] = (midY + c2[5]) / 2
+
+	c1[6] = (c1[4] + c2[2]) / 2
+	c1[7] = (c1[5] + c2[3]) / 2
+
+	// Last Point of c1 is equal to the first point of c2
+	c2[0], c2[1] = c1[6], c1[7]
+}
+
+// TraceCubic generate lines subdividing the cubic curve using a Liner
+// flattening_threshold helps determines the flattening expectation of the curve
+func TraceCubic(t Liner, cubic []float64, flatteningThreshold float64) error {
+	if len(cubic) < 8 {
+		return errors.New("cubic length must be >= 8")
+	}
+	// Allocation curves
+	var curves [CurveRecursionLimit * 8]float64
+	copy(curves[0:8], cubic[0:8])
+	i := 0
+
+	// current curve
+	var c []float64
+
+	var dx, dy, d2, d3 float64
+
+	for i >= 0 {
+		c = curves[i:]
+		dx = c[6] - c[0]
+		dy = c[7] - c[1]
+
+		d2 = math.Abs((c[2]-c[6])*dy - (c[3]-c[7])*dx)
+		d3 = math.Abs((c[4]-c[6])*dy - (c[5]-c[7])*dx)
+
+		// if it's flat then trace a line
+		if (d2+d3)*(d2+d3) <= flatteningThreshold*(dx*dx+dy*dy) || i == len(curves)-8 {
+			t.LineTo(c[6], c[7])
+			i -= 8
+		} else {
+			// second half of bezier go lower onto the stack
+			SubdivideCubic(c, curves[i+8:], curves[i:])
+			i += 8
+		}
+	}
+	return nil
+}
+
+// Quad
+// x1, y1, cpx1, cpy2, x2, y2 float64
+
+// SubdivideQuad a Bezier quad curve in 2 equivalents Bezier quad curves.
+// c1 and c2 parameters are the resulting curves
+// length of c, c1 and c2 must be 6 otherwise it panics.
+func SubdivideQuad(c, c1, c2 []float64) {
+	// First point of c is the first point of c1
+	c1[0], c1[1] = c[0], c[1]
+	// Last point of c is the last point of c2
+	c2[4], c2[5] = c[4], c[5]
+
+	// Subdivide segment using midpoints
+	c1[2] = (c[0] + c[2]) / 2
+	c1[3] = (c[1] + c[3]) / 2
+	c2[2] = (c[2] + c[4]) / 2
+	c2[3] = (c[3] + c[5]) / 2
+	c1[4] = (c1[2] + c2[2]) / 2
+	c1[5] = (c1[3] + c2[3]) / 2
+	c2[0], c2[1] = c1[4], c1[5]
+	return
+}
+
+// TraceQuad generate lines subdividing the curve using a Liner
+// flattening_threshold helps determines the flattening expectation of the curve
+func TraceQuad(t Liner, quad []float64, flatteningThreshold float64) error {
+	if len(quad) < 6 {
+		return errors.New("quad length must be >= 6")
+	}
+	// Allocates curves stack
+	var curves [CurveRecursionLimit * 6]float64
+	copy(curves[0:6], quad[0:6])
+	i := 0
+	// current curve
+	var c []float64
+	var dx, dy, d float64
+
+	for i >= 0 {
+		c = curves[i:]
+		dx = c[4] - c[0]
+		dy = c[5] - c[1]
+
+		d = math.Abs(((c[2]-c[4])*dy - (c[3]-c[5])*dx))
+
+		// if it's flat then trace a line
+		if (d*d) <= flatteningThreshold*(dx*dx+dy*dy) || i == len(curves)-6 {
+			t.LineTo(c[4], c[5])
+			i -= 6
+		} else {
+			// second half of bezier go lower onto the stack
+			SubdivideQuad(c, curves[i+6:], curves[i:])
+			i += 6
+		}
+	}
+	return nil
+}
+
+// TraceArc trace an arc using a Liner
+func TraceArc(t Liner, x, y, rx, ry, start, angle, scale float64) (lastX, lastY float64) {
+	end := start + angle
+	clockWise := true
+	if angle < 0 {
+		clockWise = false
+	}
+	ra := (math.Abs(rx) + math.Abs(ry)) / 2
+	da := math.Acos(ra/(ra+0.125/scale)) * 2
+	//normalize
+	if !clockWise {
+		da = -da
+	}
+	angle = start + da
+	var curX, curY float64
+	for {
+		if (angle < end-da/4) != clockWise {
+			curX = x + math.Cos(end)*rx
+			curY = y + math.Sin(end)*ry
+			return curX, curY
+		}
+		curX = x + math.Cos(angle)*rx
+		curY = y + math.Sin(angle)*ry
+
+		angle += da
+		t.LineTo(curX, curY)
+	}
+}

draw2dbase/curve_test.go

@@ -0,0 +1,176 @@
+package draw2dbase
+
+import (
+	"bufio"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"log"
+	"os"
+	"testing"
+)
+
+var (
+	flatteningThreshold = 0.5
+	testsCubicFloat64   = []float64{
+		100, 100, 200, 100, 100, 200, 200, 200,
+		100, 100, 300, 200, 200, 200, 300, 100,
+		100, 100, 0, 300, 200, 0, 300, 300,
+		150, 290, 10, 10, 290, 10, 150, 290,
+		10, 290, 10, 10, 290, 10, 290, 290,
+		100, 290, 290, 10, 10, 10, 200, 290,
+	}
+	testsQuadFloat64 = []float64{
+		100, 100, 200, 100, 200, 200,
+		100, 100, 290, 200, 290, 100,
+		100, 100, 0, 290, 200, 290,
+		150, 290, 10, 10, 290, 290,
+		10, 290, 10, 10, 290, 290,
+		100, 290, 290, 10, 120, 290,
+	}
+)
+
+func init() {
+	os.Mkdir("test_results", 0666)
+	f, err := os.Create("../output/curve/_test.html")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer f.Close()
+	log.Printf("Create html viewer")
+	f.Write([]byte("<html><body>"))
+	for i := 0; i < len(testsCubicFloat64)/8; i++ {
+		f.Write([]byte(fmt.Sprintf("<div><img src='_test%d.png'/></div>\n", i)))
+	}
+	for i := 0; i < len(testsQuadFloat64); i++ {
+		f.Write([]byte(fmt.Sprintf("<div><img src='_testQuad%d.png'/>\n</div>\n", i)))
+	}
+	f.Write([]byte("</body></html>"))
+
+}
+
+func drawPoints(img draw.Image, c color.Color, s ...float64) image.Image {
+	for i := 0; i < len(s); i += 2 {
+		x, y := int(s[i]+0.5), int(s[i+1]+0.5)
+		img.Set(x, y, c)
+		img.Set(x, y+1, c)
+		img.Set(x, y-1, c)
+		img.Set(x+1, y, c)
+		img.Set(x+1, y+1, c)
+		img.Set(x+1, y-1, c)
+		img.Set(x-1, y, c)
+		img.Set(x-1, y+1, c)
+		img.Set(x-1, y-1, c)
+
+	}
+	return img
+}
+
+func TestCubicCurve(t *testing.T) {
+	for i := 0; i < len(testsCubicFloat64); i += 8 {
+		var p SegmentedPath
+		p.MoveTo(testsCubicFloat64[i], testsCubicFloat64[i+1])
+		TraceCubic(&p, testsCubicFloat64[i:], flatteningThreshold)
+		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
+		PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, testsCubicFloat64[i:i+8]...)
+		PolylineBresenham(img, image.Black, p.Points...)
+		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
+		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.Points...)
+		SaveToPngFile(fmt.Sprintf("../output/curve/_test%d.png", i/8), img)
+		log.Printf("Num of points: %d\n", len(p.Points))
+	}
+	fmt.Println()
+}
+
+func TestQuadCurve(t *testing.T) {
+	for i := 0; i < len(testsQuadFloat64); i += 6 {
+		var p SegmentedPath
+		p.MoveTo(testsQuadFloat64[i], testsQuadFloat64[i+1])
+		TraceQuad(&p, testsQuadFloat64[i:], flatteningThreshold)
+		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
+		PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, testsQuadFloat64[i:i+6]...)
+		PolylineBresenham(img, image.Black, p.Points...)
+		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
+		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.Points...)
+		SaveToPngFile(fmt.Sprintf("../output/curve/_testQuad%d.png", i), img)
+		log.Printf("Num of points: %d\n", len(p.Points))
+	}
+	fmt.Println()
+}
+
+func TestQuadCurveCombinedPoint(t *testing.T) {
+	var p1 SegmentedPath
+	TraceQuad(&p1, []float64{0, 0, 0, 0, 0, 0}, flatteningThreshold)
+	if len(p1.Points) != 2 {
+		t.Error("It must have one point for this curve", len(p1.Points))
+	}
+	var p2 SegmentedPath
+	TraceQuad(&p2, []float64{0, 0, 100, 100, 0, 0}, flatteningThreshold)
+	if len(p2.Points) != 2 {
+		t.Error("It must have one point for this curve", len(p2.Points))
+	}
+}
+
+func TestCubicCurveCombinedPoint(t *testing.T) {
+	var p1 SegmentedPath
+	TraceCubic(&p1, []float64{0, 0, 0, 0, 0, 0, 0, 0}, flatteningThreshold)
+	if len(p1.Points) != 2 {
+		t.Error("It must have one point for this curve", len(p1.Points))
+	}
+	var p2 SegmentedPath
+	TraceCubic(&p2, []float64{0, 0, 100, 100, 200, 200, 0, 0}, flatteningThreshold)
+	if len(p2.Points) != 2 {
+		t.Error("It must have one point for this curve", len(p2.Points))
+	}
+}
+
+func BenchmarkCubicCurve(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		for i := 0; i < len(testsCubicFloat64); i += 8 {
+			var p SegmentedPath
+			p.MoveTo(testsCubicFloat64[i], testsCubicFloat64[i+1])
+			TraceCubic(&p, testsCubicFloat64[i:], flatteningThreshold)
+		}
+	}
+}
+
+// SaveToPngFile create and save an image to a file using PNG format
+func SaveToPngFile(filePath string, m image.Image) error {
+	// Create the file
+	f, err := os.Create(filePath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	// Create Writer from file
+	b := bufio.NewWriter(f)
+	// Write the image into the buffer
+	err = png.Encode(b, m)
+	if err != nil {
+		return err
+	}
+	err = b.Flush()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func TestOutOfRangeTraceCurve(t *testing.T) {
+	c := []float64{
+		100, 100, 200, 100, 100, 200,
+	}
+	var p SegmentedPath
+	TraceCubic(&p, c, flatteningThreshold)
+}
+
+func TestOutOfRangeTraceQuad(t *testing.T) {
+	c := []float64{
+		100, 100, 200, 100,
+	}
+	var p SegmentedPath
+	TraceQuad(&p, c, flatteningThreshold)
+}

draw2dbase/dasher.go

@@ -1,51 +1,48 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
 
-package draw2d
+package draw2dbase
 
 type DashVertexConverter struct {
-	command        VertexCommand
+	next           Flattener
-	next           VertexConverter
 	x, y, distance float64
 	dash           []float64
 	currentDash    int
 	dashOffset     float64
 }
 
-func NewDashConverter(dash []float64, dashOffset float64, converter VertexConverter) *DashVertexConverter {
+func NewDashConverter(dash []float64, dashOffset float64, flattener Flattener) *DashVertexConverter {
 	var dasher DashVertexConverter
 	dasher.dash = dash
 	dasher.currentDash = 0
 	dasher.dashOffset = dashOffset
-	dasher.next = converter
+	dasher.next = flattener
 	return &dasher
 }
 
-func (dasher *DashVertexConverter) NextCommand(cmd VertexCommand) {
+func (dasher *DashVertexConverter) LineTo(x, y float64) {
-	dasher.command = cmd
+	dasher.lineTo(x, y)
-	if dasher.command == VertexStopCommand {
-		dasher.next.NextCommand(VertexStopCommand)
-	}
 }
 
-func (dasher *DashVertexConverter) Vertex(x, y float64) {
+func (dasher *DashVertexConverter) MoveTo(x, y float64) {
-	switch dasher.command {
+	dasher.next.MoveTo(x, y)
-	case VertexStartCommand:
-		dasher.start(x, y)
-	default:
-		dasher.lineTo(x, y)
-	}
-	dasher.command = VertexNoCommand
-}
-
-func (dasher *DashVertexConverter) start(x, y float64) {
-	dasher.next.NextCommand(VertexStartCommand)
-	dasher.next.Vertex(x, y)
 	dasher.x, dasher.y = x, y
 	dasher.distance = dasher.dashOffset
 	dasher.currentDash = 0
 }
 
+func (dasher *DashVertexConverter) LineJoin() {
+	dasher.next.LineJoin()
+}
+
+func (dasher *DashVertexConverter) Close() {
+	dasher.next.Close()
+}
+
+func (dasher *DashVertexConverter) End() {
+	dasher.next.End()
+}
+
 func (dasher *DashVertexConverter) lineTo(x, y float64) {
 	rest := dasher.dash[dasher.currentDash] - dasher.distance
 	for rest < 0 {
@@ -60,12 +57,11 @@ func (dasher *DashVertexConverter) lineTo(x, y float64) {
 		ly := dasher.y + k*(y-dasher.y)
 		if dasher.currentDash%2 == 0 {
 			// line
-			dasher.next.Vertex(lx, ly)
+			dasher.next.LineTo(lx, ly)
 		} else {
 			// gap
-			dasher.next.NextCommand(VertexStopCommand)
+			dasher.next.End()
-			dasher.next.NextCommand(VertexStartCommand)
+			dasher.next.MoveTo(lx, ly)
-			dasher.next.Vertex(lx, ly)
 		}
 		d = d - rest
 		dasher.x, dasher.y = lx, ly
@@ -75,12 +71,11 @@ func (dasher *DashVertexConverter) lineTo(x, y float64) {
 	dasher.distance = d
 	if dasher.currentDash%2 == 0 {
 		// line
-		dasher.next.Vertex(x, y)
+		dasher.next.LineTo(x, y)
 	} else {
 		// gap
-		dasher.next.NextCommand(VertexStopCommand)
+		dasher.next.End()
-		dasher.next.NextCommand(VertexStartCommand)
+		dasher.next.MoveTo(x, y)
-		dasher.next.Vertex(x, y)
 	}
 	if dasher.distance >= dasher.dash[dasher.currentDash] {
 		dasher.distance = dasher.distance - dasher.dash[dasher.currentDash]
@@ -88,3 +83,7 @@ func (dasher *DashVertexConverter) lineTo(x, y float64) {
 	}
 	dasher.x, dasher.y = x, y
 }
+
+func distance(x1, y1, x2, y2 float64) float64 {
+	return vectorDistance(x2-x1, y2-y1)
+}

draw2dbase/demux_flattener.go

@@ -0,0 +1,35 @@
+package draw2dbase
+
+type DemuxFlattener struct {
+	Flatteners []Flattener
+}
+
+func (dc DemuxFlattener) MoveTo(x, y float64) {
+	for _, flattener := range dc.Flatteners {
+		flattener.MoveTo(x, y)
+	}
+}
+
+func (dc DemuxFlattener) LineTo(x, y float64) {
+	for _, flattener := range dc.Flatteners {
+		flattener.LineTo(x, y)
+	}
+}
+
+func (dc DemuxFlattener) LineJoin() {
+	for _, flattener := range dc.Flatteners {
+		flattener.LineJoin()
+	}
+}
+
+func (dc DemuxFlattener) Close() {
+	for _, flattener := range dc.Flatteners {
+		flattener.Close()
+	}
+}
+
+func (dc DemuxFlattener) End() {
+	for _, flattener := range dc.Flatteners {
+		flattener.End()
+	}
+}

draw2dbase/flattener.go

@@ -0,0 +1,127 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 06/12/2010 by Laurent Le Goff
+
+package draw2dbase
+
+import (
+	"git.fromouter.space/crunchy-rocks/draw2d"
+)
+
+// Liner receive segment definition
+type Liner interface {
+	// LineTo Draw a line from the current position to the point (x, y)
+	LineTo(x, y float64)
+}
+
+// Flattener receive segment definition
+type Flattener interface {
+	// MoveTo Start a New line from the point (x, y)
+	MoveTo(x, y float64)
+	// LineTo Draw a line from the current position to the point (x, y)
+	LineTo(x, y float64)
+	// LineJoin use Round, Bevel or miter to join points
+	LineJoin()
+	// Close add the most recent starting point to close the path to create a polygon
+	Close()
+	// End mark the current line as finished so we can draw caps
+	End()
+}
+
+// Flatten convert curves into straight segments keeping join segments info
+func Flatten(path *draw2d.Path, flattener Flattener, scale float64) {
+	// First Point
+	var startX, startY float64 = 0, 0
+	// Current Point
+	var x, y float64 = 0, 0
+	i := 0
+	for _, cmp := range path.Components {
+		switch cmp {
+		case draw2d.MoveToCmp:
+			x, y = path.Points[i], path.Points[i+1]
+			startX, startY = x, y
+			if i != 0 {
+				flattener.End()
+			}
+			flattener.MoveTo(x, y)
+			i += 2
+		case draw2d.LineToCmp:
+			x, y = path.Points[i], path.Points[i+1]
+			flattener.LineTo(x, y)
+			flattener.LineJoin()
+			i += 2
+		case draw2d.QuadCurveToCmp:
+			TraceQuad(flattener, path.Points[i-2:], 0.5)
+			x, y = path.Points[i+2], path.Points[i+3]
+			flattener.LineTo(x, y)
+			i += 4
+		case draw2d.CubicCurveToCmp:
+			TraceCubic(flattener, path.Points[i-2:], 0.5)
+			x, y = path.Points[i+4], path.Points[i+5]
+			flattener.LineTo(x, y)
+			i += 6
+		case draw2d.ArcToCmp:
+			x, y = TraceArc(flattener, path.Points[i], path.Points[i+1], path.Points[i+2], path.Points[i+3], path.Points[i+4], path.Points[i+5], scale)
+			flattener.LineTo(x, y)
+			i += 6
+		case draw2d.CloseCmp:
+			flattener.LineTo(startX, startY)
+			flattener.Close()
+		}
+	}
+	flattener.End()
+}
+
+// Transformer apply the Matrix transformation tr
+type Transformer struct {
+	Tr        draw2d.Matrix
+	Flattener Flattener
+}
+
+func (t Transformer) MoveTo(x, y float64) {
+	u := x*t.Tr[0] + y*t.Tr[2] + t.Tr[4]
+	v := x*t.Tr[1] + y*t.Tr[3] + t.Tr[5]
+	t.Flattener.MoveTo(u, v)
+}
+
+func (t Transformer) LineTo(x, y float64) {
+	u := x*t.Tr[0] + y*t.Tr[2] + t.Tr[4]
+	v := x*t.Tr[1] + y*t.Tr[3] + t.Tr[5]
+	t.Flattener.LineTo(u, v)
+}
+
+func (t Transformer) LineJoin() {
+	t.Flattener.LineJoin()
+}
+
+func (t Transformer) Close() {
+	t.Flattener.Close()
+}
+
+func (t Transformer) End() {
+	t.Flattener.End()
+}
+
+type SegmentedPath struct {
+	Points []float64
+}
+
+func (p *SegmentedPath) MoveTo(x, y float64) {
+	p.Points = append(p.Points, x, y)
+	// TODO need to mark this point as moveto
+}
+
+func (p *SegmentedPath) LineTo(x, y float64) {
+	p.Points = append(p.Points, x, y)
+}
+
+func (p *SegmentedPath) LineJoin() {
+	// TODO need to mark the current point as linejoin
+}
+
+func (p *SegmentedPath) Close() {
+	// TODO Close
+}
+
+func (p *SegmentedPath) End() {
+	// Nothing to do
+}

draw2dbase/line.go

@@ -1,6 +1,7 @@
 // Copyright 2011 The draw2d Authors. All rights reserved.
 // created: 27/05/2011 by Laurent Le Goff
-package raster
+
+package draw2dbase
 
 import (
 	"image/color"
@@ -14,12 +15,14 @@ func abs(i int) int {
 	return i
 }
 
+// PolylineBresenham draws a polyline to an image
 func PolylineBresenham(img draw.Image, c color.Color, s ...float64) {
 	for i := 2; i < len(s); i += 2 {
 		Bresenham(img, c, int(s[i-2]+0.5), int(s[i-1]+0.5), int(s[i]+0.5), int(s[i+1]+0.5))
 	}
 }
 
+// Bresenham draws a line between (x0, y0) and (x1, y1)
 func Bresenham(img draw.Image, color color.Color, x0, y0, x1, y1 int) {
 	dx := abs(x1 - x0)
 	dy := abs(y1 - y0)

draw2dbase/stack_gc.go

@@ -1,39 +1,50 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
 
-package draw2d
+package draw2dbase
 
 import (
+	"fmt"
 	"image"
 	"image/color"
 
-	"code.google.com/p/freetype-go/freetype/truetype"
+	"git.fromouter.space/crunchy-rocks/draw2d"
+
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
 )
 
+var DefaultFontData = draw2d.FontData{Name: "luxi", Family: draw2d.FontFamilySans, Style: draw2d.FontStyleNormal}
+
 type StackGraphicContext struct {
 	Current *ContextStack
 }
 
 type ContextStack struct {
-	Tr          MatrixTransform
+	Tr          draw2d.Matrix
-	Path        *PathStorage
+	Path        *draw2d.Path
 	LineWidth   float64
 	Dash        []float64
 	DashOffset  float64
 	StrokeColor color.Color
 	FillColor   color.Color
-	FillRule    FillRule
+	FillRule    draw2d.FillRule
-	Cap         Cap
+	Cap         draw2d.LineCap
-	Join        Join
+	Join        draw2d.LineJoin
 	FontSize    float64
-	FontData    FontData
+	FontData    draw2d.FontData
 
 	Font *truetype.Font
 	// fontSize and dpi are used to calculate scale. scale is the number of
 	// 26.6 fixed point units in 1 em.
 	Scale float64
 
-	previous *ContextStack
+	Previous *ContextStack
+}
+
+// GetFontName gets the current FontData with fontSize as a string
+func (cs *ContextStack) GetFontName() string {
+	fontData := cs.FontData
+	return fmt.Sprintf("%s:%d:%d:%9.2f", fontData.Name, fontData.Family, fontData.Style, cs.FontSize)
 }
 
 /**
@@ -42,41 +53,41 @@ type ContextStack struct {
 func NewStackGraphicContext() *StackGraphicContext {
 	gc := &StackGraphicContext{}
 	gc.Current = new(ContextStack)
-	gc.Current.Tr = NewIdentityMatrix()
+	gc.Current.Tr = draw2d.NewIdentityMatrix()
-	gc.Current.Path = NewPathStorage()
+	gc.Current.Path = new(draw2d.Path)
 	gc.Current.LineWidth = 1.0
 	gc.Current.StrokeColor = image.Black
 	gc.Current.FillColor = image.White
-	gc.Current.Cap = RoundCap
+	gc.Current.Cap = draw2d.RoundCap
-	gc.Current.FillRule = FillRuleEvenOdd
+	gc.Current.FillRule = draw2d.FillRuleEvenOdd
-	gc.Current.Join = RoundJoin
+	gc.Current.Join = draw2d.RoundJoin
 	gc.Current.FontSize = 10
-	gc.Current.FontData = defaultFontData
+	gc.Current.FontData = DefaultFontData
 	return gc
 }
 
-func (gc *StackGraphicContext) GetMatrixTransform() MatrixTransform {
+func (gc *StackGraphicContext) GetMatrixTransform() draw2d.Matrix {
 	return gc.Current.Tr
 }
 
-func (gc *StackGraphicContext) SetMatrixTransform(Tr MatrixTransform) {
+func (gc *StackGraphicContext) SetMatrixTransform(Tr draw2d.Matrix) {
 	gc.Current.Tr = Tr
 }
 
-func (gc *StackGraphicContext) ComposeMatrixTransform(Tr MatrixTransform) {
+func (gc *StackGraphicContext) ComposeMatrixTransform(Tr draw2d.Matrix) {
-	gc.Current.Tr = Tr.Multiply(gc.Current.Tr)
+	gc.Current.Tr.Compose(Tr)
 }
 
 func (gc *StackGraphicContext) Rotate(angle float64) {
-	gc.Current.Tr = NewRotationMatrix(angle).Multiply(gc.Current.Tr)
+	gc.Current.Tr.Rotate(angle)
 }
 
 func (gc *StackGraphicContext) Translate(tx, ty float64) {
-	gc.Current.Tr = NewTranslationMatrix(tx, ty).Multiply(gc.Current.Tr)
+	gc.Current.Tr.Translate(tx, ty)
 }
 
 func (gc *StackGraphicContext) Scale(sx, sy float64) {
-	gc.Current.Tr = NewScaleMatrix(sx, sy).Multiply(gc.Current.Tr)
+	gc.Current.Tr.Scale(sx, sy)
 }
 
 func (gc *StackGraphicContext) SetStrokeColor(c color.Color) {
@@ -87,45 +98,49 @@ func (gc *StackGraphicContext) SetFillColor(c color.Color) {
 	gc.Current.FillColor = c
 }
 
-func (gc *StackGraphicContext) SetFillRule(f FillRule) {
+func (gc *StackGraphicContext) SetFillRule(f draw2d.FillRule) {
 	gc.Current.FillRule = f
 }
 
-func (gc *StackGraphicContext) SetLineWidth(LineWidth float64) {
+func (gc *StackGraphicContext) SetLineWidth(lineWidth float64) {
-	gc.Current.LineWidth = LineWidth
+	gc.Current.LineWidth = lineWidth
 }
 
-func (gc *StackGraphicContext) SetLineCap(Cap Cap) {
+func (gc *StackGraphicContext) SetLineCap(cap draw2d.LineCap) {
-	gc.Current.Cap = Cap
+	gc.Current.Cap = cap
 }
 
-func (gc *StackGraphicContext) SetLineJoin(Join Join) {
+func (gc *StackGraphicContext) SetLineJoin(join draw2d.LineJoin) {
-	gc.Current.Join = Join
+	gc.Current.Join = join
 }
 
-func (gc *StackGraphicContext) SetLineDash(Dash []float64, DashOffset float64) {
+func (gc *StackGraphicContext) SetLineDash(dash []float64, dashOffset float64) {
-	gc.Current.Dash = Dash
+	gc.Current.Dash = dash
-	gc.Current.DashOffset = DashOffset
+	gc.Current.DashOffset = dashOffset
 }
 
-func (gc *StackGraphicContext) SetFontSize(FontSize float64) {
+func (gc *StackGraphicContext) SetFontSize(fontSize float64) {
-	gc.Current.FontSize = FontSize
+	gc.Current.FontSize = fontSize
 }
 
 func (gc *StackGraphicContext) GetFontSize() float64 {
 	return gc.Current.FontSize
 }
 
-func (gc *StackGraphicContext) SetFontData(FontData FontData) {
+func (gc *StackGraphicContext) SetFontData(fontData draw2d.FontData) {
-	gc.Current.FontData = FontData
+	gc.Current.FontData = fontData
 }
 
-func (gc *StackGraphicContext) GetFontData() FontData {
+func (gc *StackGraphicContext) GetFontData() draw2d.FontData {
 	return gc.Current.FontData
 }
 
 func (gc *StackGraphicContext) BeginPath() {
-	gc.Current.Path = NewPathStorage()
+	gc.Current.Path.Clear()
+}
+
+func (gc *StackGraphicContext) GetPath() draw2d.Path {
+	return *gc.Current.Path.Copy()
 }
 
 func (gc *StackGraphicContext) IsEmpty() bool {
@@ -140,42 +155,22 @@ func (gc *StackGraphicContext) MoveTo(x, y float64) {
 	gc.Current.Path.MoveTo(x, y)
 }
 
-func (gc *StackGraphicContext) RMoveTo(dx, dy float64) {
-	gc.Current.Path.RMoveTo(dx, dy)
-}
-
 func (gc *StackGraphicContext) LineTo(x, y float64) {
 	gc.Current.Path.LineTo(x, y)
 }
 
-func (gc *StackGraphicContext) RLineTo(dx, dy float64) {
-	gc.Current.Path.RLineTo(dx, dy)
-}
-
 func (gc *StackGraphicContext) QuadCurveTo(cx, cy, x, y float64) {
 	gc.Current.Path.QuadCurveTo(cx, cy, x, y)
 }
 
-func (gc *StackGraphicContext) RQuadCurveTo(dcx, dcy, dx, dy float64) {
-	gc.Current.Path.RQuadCurveTo(dcx, dcy, dx, dy)
-}
-
 func (gc *StackGraphicContext) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) {
 	gc.Current.Path.CubicCurveTo(cx1, cy1, cx2, cy2, x, y)
 }
 
-func (gc *StackGraphicContext) RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64) {
-	gc.Current.Path.RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy)
-}
-
 func (gc *StackGraphicContext) ArcTo(cx, cy, rx, ry, startAngle, angle float64) {
 	gc.Current.Path.ArcTo(cx, cy, rx, ry, startAngle, angle)
 }
 
-func (gc *StackGraphicContext) RArcTo(dcx, dcy, rx, ry, startAngle, angle float64) {
-	gc.Current.Path.RArcTo(dcx, dcy, rx, ry, startAngle, angle)
-}
-
 func (gc *StackGraphicContext) Close() {
 	gc.Current.Path.Close()
 }
@@ -196,14 +191,18 @@ func (gc *StackGraphicContext) Save() {
 	context.Font = gc.Current.Font
 	context.Scale = gc.Current.Scale
 	copy(context.Tr[:], gc.Current.Tr[:])
-	context.previous = gc.Current
+	context.Previous = gc.Current
 	gc.Current = context
 }
 
 func (gc *StackGraphicContext) Restore() {
-	if gc.Current.previous != nil {
+	if gc.Current.Previous != nil {
 		oldContext := gc.Current
-		gc.Current = gc.Current.previous
+		gc.Current = gc.Current.Previous
-		oldContext.previous = nil
+		oldContext.Previous = nil
 	}
 }
+
+func (gc *StackGraphicContext) GetFontName() string {
+	return gc.Current.GetFontName()
+}

draw2dbase/stroker.go

@@ -0,0 +1,90 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 13/12/2010 by Laurent Le Goff
+
+package draw2dbase
+
+import (
+	"math"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+)
+
+type LineStroker struct {
+	Flattener     Flattener
+	HalfLineWidth float64
+	Cap           draw2d.LineCap
+	Join          draw2d.LineJoin
+	vertices      []float64
+	rewind        []float64
+	x, y, nx, ny  float64
+}
+
+func NewLineStroker(c draw2d.LineCap, j draw2d.LineJoin, flattener Flattener) *LineStroker {
+	l := new(LineStroker)
+	l.Flattener = flattener
+	l.HalfLineWidth = 0.5
+	l.Cap = c
+	l.Join = j
+	return l
+}
+
+func (l *LineStroker) MoveTo(x, y float64) {
+	l.x, l.y = x, y
+}
+
+func (l *LineStroker) LineTo(x, y float64) {
+	l.line(l.x, l.y, x, y)
+}
+
+func (l *LineStroker) LineJoin() {
+
+}
+
+func (l *LineStroker) line(x1, y1, x2, y2 float64) {
+	dx := (x2 - x1)
+	dy := (y2 - y1)
+	d := vectorDistance(dx, dy)
+	if d != 0 {
+		nx := dy * l.HalfLineWidth / d
+		ny := -(dx * l.HalfLineWidth / d)
+		l.appendVertex(x1+nx, y1+ny, x2+nx, y2+ny, x1-nx, y1-ny, x2-nx, y2-ny)
+		l.x, l.y, l.nx, l.ny = x2, y2, nx, ny
+	}
+}
+
+func (l *LineStroker) Close() {
+	if len(l.vertices) > 1 {
+		l.appendVertex(l.vertices[0], l.vertices[1], l.rewind[0], l.rewind[1])
+	}
+}
+
+func (l *LineStroker) End() {
+	if len(l.vertices) > 1 {
+		l.Flattener.MoveTo(l.vertices[0], l.vertices[1])
+		for i, j := 2, 3; j < len(l.vertices); i, j = i+2, j+2 {
+			l.Flattener.LineTo(l.vertices[i], l.vertices[j])
+		}
+	}
+	for i, j := len(l.rewind)-2, len(l.rewind)-1; j > 0; i, j = i-2, j-2 {
+		l.Flattener.LineTo(l.rewind[i], l.rewind[j])
+	}
+	if len(l.vertices) > 1 {
+		l.Flattener.LineTo(l.vertices[0], l.vertices[1])
+	}
+	l.Flattener.End()
+	// reinit vertices
+	l.vertices = l.vertices[0:0]
+	l.rewind = l.rewind[0:0]
+	l.x, l.y, l.nx, l.ny = 0, 0, 0, 0
+
+}
+
+func (l *LineStroker) appendVertex(vertices ...float64) {
+	s := len(vertices) / 2
+	l.vertices = append(l.vertices, vertices[:s]...)
+	l.rewind = append(l.rewind, vertices[s:]...)
+}
+
+func vectorDistance(dx, dy float64) float64 {
+	return float64(math.Sqrt(dx*dx + dy*dy))
+}

draw2dbase/text.go

@@ -0,0 +1,82 @@
+package draw2dbase
+
+import "git.fromouter.space/crunchy-rocks/draw2d"
+
+// GlyphCache manage a cache of glyphs
+type GlyphCache interface {
+	// Fetch fetches a glyph from the cache, storing with Render first if it doesn't already exist
+	Fetch(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph
+}
+
+// GlyphCacheImp manage a map of glyphs without sync mecanism, not thread safe
+type GlyphCacheImp struct {
+	glyphs map[string]map[rune]*Glyph
+}
+
+// NewGlyphCache initializes a GlyphCache
+func NewGlyphCache() *GlyphCacheImp {
+	glyphs := make(map[string]map[rune]*Glyph)
+	return &GlyphCacheImp{
+		glyphs: glyphs,
+	}
+}
+
+// Fetch fetches a glyph from the cache, calling renderGlyph first if it doesn't already exist
+func (glyphCache *GlyphCacheImp) Fetch(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph {
+	if glyphCache.glyphs[fontName] == nil {
+		glyphCache.glyphs[fontName] = make(map[rune]*Glyph, 60)
+	}
+	if glyphCache.glyphs[fontName][chr] == nil {
+		glyphCache.glyphs[fontName][chr] = renderGlyph(gc, fontName, chr)
+	}
+	return glyphCache.glyphs[fontName][chr].Copy()
+}
+
+// renderGlyph renders a glyph then caches and returns it
+func renderGlyph(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph {
+	gc.Save()
+	defer gc.Restore()
+	gc.BeginPath()
+	width := gc.CreateStringPath(string(chr), 0, 0)
+	path := gc.GetPath()
+	return &Glyph{
+		Path:  &path,
+		Width: width,
+	}
+}
+
+// Glyph represents a rune which has been converted to a Path and width
+type Glyph struct {
+	// path represents a glyph, it is always at (0, 0)
+	Path *draw2d.Path
+	// Width of the glyph
+	Width float64
+}
+
+// Copy Returns a copy of a Glyph
+func (g *Glyph) Copy() *Glyph {
+	return &Glyph{
+		Path:  g.Path.Copy(),
+		Width: g.Width,
+	}
+}
+
+// Fill copies a glyph from the cache, and fills it
+func (g *Glyph) Fill(gc draw2d.GraphicContext, x, y float64) float64 {
+	gc.Save()
+	gc.BeginPath()
+	gc.Translate(x, y)
+	gc.Fill(g.Path)
+	gc.Restore()
+	return g.Width
+}
+
+// Stroke fetches a glyph from the cache, and strokes it
+func (g *Glyph) Stroke(gc draw2d.GraphicContext, x, y float64) float64 {
+	gc.Save()
+	gc.BeginPath()
+	gc.Translate(x, y)
+	gc.Stroke(g.Path)
+	gc.Restore()
+	return g.Width
+}

draw2dgl/gc.go

@@ -4,11 +4,19 @@ import (
 	"image"
 	"image/color"
 	"image/draw"
+	"log"
+	"math"
 	"runtime"
 
-	"code.google.com/p/freetype-go/freetype/raster"
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dbase"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dimg"
 	"github.com/go-gl/gl/v2.1/gl"
-	"gopkg.in/llgcode/draw2d.v1"
+	"github.com/golang/freetype/raster"
+	"github.com/golang/freetype/truetype"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
 )
 
 func init() {
@@ -50,8 +58,8 @@ func (p *Painter) Paint(ss []raster.Span, done bool) {
 		vertices []int32
 	)
 	for _, s := range ss {
-		ma := s.A >> 16
+		a := uint8((s.Alpha * p.ca / M16) >> 8)
-		a := uint8((ma * p.ca / M16) >> 8)
+
 		colors = p.colors[ci:]
 		colors[0] = p.cr
 		colors[1] = p.cg
@@ -112,67 +120,217 @@ func NewPainter() *Painter {
 }
 
 type GraphicContext struct {
-	*draw2d.StackGraphicContext
+	*draw2dbase.StackGraphicContext
 	painter          *Painter
 	fillRasterizer   *raster.Rasterizer
 	strokeRasterizer *raster.Rasterizer
+	FontCache        draw2d.FontCache
+	glyphCache       draw2dbase.GlyphCache
+	glyphBuf         *truetype.GlyphBuf
+	DPI              int
 }
 
 // NewGraphicContext creates a new Graphic context from an image.
 func NewGraphicContext(width, height int) *GraphicContext {
 	gc := &GraphicContext{
-		draw2d.NewStackGraphicContext(),
+		draw2dbase.NewStackGraphicContext(),
 		NewPainter(),
 		raster.NewRasterizer(width, height),
 		raster.NewRasterizer(width, height),
+		draw2d.GetGlobalFontCache(),
+		draw2dbase.NewGlyphCache(),
+		&truetype.GlyphBuf{},
+		92,
 	}
 	return gc
 }
 
+func (gc *GraphicContext) loadCurrentFont() (*truetype.Font, error) {
+	font, err := gc.FontCache.Load(gc.Current.FontData)
+	if err != nil {
+		font, err = gc.FontCache.Load(draw2dbase.DefaultFontData)
+	}
+	if font != nil {
+		gc.SetFont(font)
+		gc.SetFontSize(gc.Current.FontSize)
+	}
+	return font, err
+}
+
+func (gc *GraphicContext) drawGlyph(glyph truetype.Index, dx, dy float64) error {
+	if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), glyph, font.HintingNone); err != nil {
+		return err
+	}
+	e0 := 0
+	for _, e1 := range gc.glyphBuf.Ends {
+		DrawContour(gc, gc.glyphBuf.Points[e0:e1], dx, dy)
+		e0 = e1
+	}
+	return nil
+}
+
+// CreateStringPath creates a path from the string s at x, y, and returns the string width.
+// The text is placed so that the left edge of the em square of the first character of s
+// and the baseline intersect at x, y. The majority of the affected pixels will be
+// above and to the right of the point, but some may be below or to the left.
+// For example, drawing a string that starts with a 'J' in an italic font may
+// affect pixels below and left of the point.
 func (gc *GraphicContext) CreateStringPath(s string, x, y float64) float64 {
-	panic("not implemented")
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	for _, rune := range s {
+		index := f.Index(rune)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		err := gc.drawGlyph(index, x, y)
+		if err != nil {
+			log.Println(err)
+			return startx - x
+		}
+		x += fUnitsToFloat64(f.HMetric(fixed.Int26_6(gc.Current.Scale), index).AdvanceWidth)
+		prev, hasPrev = index, true
+	}
+	return x - startx
 }
 
-func (gc *GraphicContext) FillStringAt(text string, x, y float64) (cursor float64) {
+// FillString draws the text at point (0, 0)
-	panic("not implemented")
+func (gc *GraphicContext) FillString(text string) (width float64) {
+	return gc.FillStringAt(text, 0, 0)
 }
 
+// FillStringAt draws the text at the specified point (x, y)
+func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64) {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	fontName := gc.GetFontName()
+	for _, r := range text {
+		index := f.Index(r)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		glyph := gc.glyphCache.Fetch(gc, fontName, r)
+		x += glyph.Fill(gc, x, y)
+		prev, hasPrev = index, true
+	}
+	return x - startx
+}
+
+// GetStringBounds returns the approximate pixel bounds of the string s at x, y.
+// The the left edge of the em square of the first character of s
+// and the baseline intersect at 0, 0 in the returned coordinates.
+// Therefore the top and left coordinates may well be negative.
 func (gc *GraphicContext) GetStringBounds(s string) (left, top, right, bottom float64) {
-	panic("not implemented")
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0, 0, 0, 0
+	}
+	top, left, bottom, right = 10e6, 10e6, -10e6, -10e6
+	cursor := 0.0
+	prev, hasPrev := truetype.Index(0), false
+	for _, rune := range s {
+		index := f.Index(rune)
+		if hasPrev {
+			cursor += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), index, font.HintingNone); err != nil {
+			log.Println(err)
+			return 0, 0, 0, 0
+		}
+		e0 := 0
+		for _, e1 := range gc.glyphBuf.Ends {
+			ps := gc.glyphBuf.Points[e0:e1]
+			for _, p := range ps {
+				x, y := pointToF64Point(p)
+				top = math.Min(top, y)
+				bottom = math.Max(bottom, y)
+				left = math.Min(left, x+cursor)
+				right = math.Max(right, x+cursor)
+			}
+		}
+		cursor += fUnitsToFloat64(f.HMetric(fixed.Int26_6(gc.Current.Scale), index).AdvanceWidth)
+		prev, hasPrev = index, true
+	}
+	return left, top, right, bottom
 }
 
-func (gc *GraphicContext) StrokeString(text string) (cursor float64) {
+// StrokeString draws the contour of the text at point (0, 0)
+func (gc *GraphicContext) StrokeString(text string) (width float64) {
 	return gc.StrokeStringAt(text, 0, 0)
 }
 
-func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (cursor float64) {
+// StrokeStringAt draws the contour of the text at point (x, y)
-	width := gc.CreateStringPath(text, x, y)
+func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float64) {
-	gc.Stroke()
+	f, err := gc.loadCurrentFont()
-	return width
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	fontName := gc.GetFontName()
+	for _, r := range text {
+		index := f.Index(r)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		glyph := gc.glyphCache.Fetch(gc, fontName, r)
+		x += glyph.Stroke(gc, x, y)
+		prev, hasPrev = index, true
+	}
+	return x - startx
+}
+
+// recalc recalculates scale and bounds values from the font size, screen
+// resolution and font metrics, and invalidates the glyph cache.
+func (gc *GraphicContext) recalc() {
+	gc.Current.Scale = gc.Current.FontSize * float64(gc.DPI) * (64.0 / 72.0)
 }
 
 func (gc *GraphicContext) SetDPI(dpi int) {
+	gc.DPI = dpi
+	gc.recalc()
+}
 
+// SetFont sets the font used to draw text.
+func (gc *GraphicContext) SetFont(font *truetype.Font) {
+	gc.Current.Font = font
+}
+
+// SetFontSize sets the font size in points (as in ``a 12 point font'').
+func (gc *GraphicContext) SetFontSize(fontSize float64) {
+	gc.Current.FontSize = fontSize
+	gc.recalc()
 }
 
 func (gc *GraphicContext) GetDPI() int {
-	return -1
+	return gc.DPI
 }
 
+//TODO
 func (gc *GraphicContext) Clear() {
-
+	panic("not implemented")
 }
 
+//TODO
 func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int) {
-
+	panic("not implemented")
 }
 
+//TODO
 func (gc *GraphicContext) DrawImage(img image.Image) {
-
+	panic("not implemented")
-}
-
-func (gc *GraphicContext) FillString(text string) (cursor float64) {
-	return 0
 }
 
 func (gc *GraphicContext) paint(rasterizer *raster.Rasterizer, color color.Color) {
@@ -180,56 +338,76 @@ func (gc *GraphicContext) paint(rasterizer *raster.Rasterizer, color color.Color
 	rasterizer.Rasterize(gc.painter)
 	rasterizer.Clear()
 	gc.painter.Flush()
+	gc.Current.Path.Clear()
 }
 
-func (gc *GraphicContext) Stroke(paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) Stroke(paths ...*draw2d.Path) {
 	paths = append(paths, gc.Current.Path)
 	gc.strokeRasterizer.UseNonZeroWinding = true
 
-	stroker := draw2d.NewLineStroker(gc.Current.Cap, gc.Current.Join, draw2d.NewVertexMatrixTransform(gc.Current.Tr, draw2d.NewVertexAdder(gc.strokeRasterizer)))
+	stroker := draw2dbase.NewLineStroker(gc.Current.Cap, gc.Current.Join, draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: draw2dimg.FtLineBuilder{Adder: gc.strokeRasterizer}})
 	stroker.HalfLineWidth = gc.Current.LineWidth / 2
-	var pathConverter *draw2d.PathConverter
+
+	var liner draw2dbase.Flattener
 	if gc.Current.Dash != nil && len(gc.Current.Dash) > 0 {
-		dasher := draw2d.NewDashConverter(gc.Current.Dash, gc.Current.DashOffset, stroker)
+		liner = draw2dbase.NewDashConverter(gc.Current.Dash, gc.Current.DashOffset, stroker)
-		pathConverter = draw2d.NewPathConverter(dasher)
 	} else {
-		pathConverter = draw2d.NewPathConverter(stroker)
+		liner = stroker
+	}
+	for _, p := range paths {
+		draw2dbase.Flatten(p, liner, gc.Current.Tr.GetScale())
 	}
-	pathConverter.ApproximationScale = gc.Current.Tr.GetScale() // From agg code
-	pathConverter.Convert(paths...)
 
 	gc.paint(gc.strokeRasterizer, gc.Current.StrokeColor)
-	gc.Current.Path = draw2d.NewPathStorage()
 }
 
-func (gc *GraphicContext) Fill(paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) Fill(paths ...*draw2d.Path) {
 	paths = append(paths, gc.Current.Path)
-	gc.fillRasterizer.UseNonZeroWinding = gc.Current.FillRule.UseNonZeroWinding()
+	gc.fillRasterizer.UseNonZeroWinding = useNonZeroWinding(gc.Current.FillRule)
 
-	pathConverter := draw2d.NewPathConverter(draw2d.NewVertexMatrixTransform(gc.Current.Tr, draw2d.NewVertexAdder(gc.fillRasterizer)))
+	/**** first method ****/
-	pathConverter.ApproximationScale = gc.Current.Tr.GetScale() // From agg code
+	flattener := draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: draw2dimg.FtLineBuilder{Adder: gc.fillRasterizer}}
-	pathConverter.Convert(paths...)
+	for _, p := range paths {
+		draw2dbase.Flatten(p, flattener, gc.Current.Tr.GetScale())
+	}
 
 	gc.paint(gc.fillRasterizer, gc.Current.FillColor)
-	gc.Current.Path = draw2d.NewPathStorage()
 }
 
-func (gc *GraphicContext) FillStroke(paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) FillStroke(paths ...*draw2d.Path) {
-	gc.fillRasterizer.UseNonZeroWinding = gc.Current.FillRule.UseNonZeroWinding()
+	paths = append(paths, gc.Current.Path)
+	gc.fillRasterizer.UseNonZeroWinding = useNonZeroWinding(gc.Current.FillRule)
 	gc.strokeRasterizer.UseNonZeroWinding = true
 
-	filler := draw2d.NewVertexMatrixTransform(gc.Current.Tr, draw2d.NewVertexAdder(gc.fillRasterizer))
+	flattener := draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: draw2dimg.FtLineBuilder{Adder: gc.fillRasterizer}}
 
-	stroker := draw2d.NewLineStroker(gc.Current.Cap, gc.Current.Join, draw2d.NewVertexMatrixTransform(gc.Current.Tr, draw2d.NewVertexAdder(gc.strokeRasterizer)))
+	stroker := draw2dbase.NewLineStroker(gc.Current.Cap, gc.Current.Join, draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: draw2dimg.FtLineBuilder{Adder: gc.strokeRasterizer}})
 	stroker.HalfLineWidth = gc.Current.LineWidth / 2
 
-	demux := draw2d.NewDemuxConverter(filler, stroker)
+	var liner draw2dbase.Flattener
-	paths = append(paths, gc.Current.Path)
+	if gc.Current.Dash != nil && len(gc.Current.Dash) > 0 {
-	pathConverter := draw2d.NewPathConverter(demux)
+		liner = draw2dbase.NewDashConverter(gc.Current.Dash, gc.Current.DashOffset, stroker)
-	pathConverter.ApproximationScale = gc.Current.Tr.GetScale() // From agg code
+	} else {
-	pathConverter.Convert(paths...)
+		liner = stroker
+	}
 
+	demux := draw2dbase.DemuxFlattener{Flatteners: []draw2dbase.Flattener{flattener, liner}}
+	for _, p := range paths {
+		draw2dbase.Flatten(p, demux, gc.Current.Tr.GetScale())
+	}
+
+	// Fill
 	gc.paint(gc.fillRasterizer, gc.Current.FillColor)
+	// Stroke
 	gc.paint(gc.strokeRasterizer, gc.Current.StrokeColor)
-	gc.Current.Path = draw2d.NewPathStorage()
+}
+
+func useNonZeroWinding(f draw2d.FillRule) bool {
+	switch f {
+	case draw2d.FillRuleEvenOdd:
+		return false
+	case draw2d.FillRuleWinding:
+		return true
+	}
+	return false
 }

draw2dgl/text.go

@@ -0,0 +1,82 @@
+package draw2dgl
+
+import (
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// DrawContour draws the given closed contour at the given sub-pixel offset.
+func DrawContour(path draw2d.PathBuilder, ps []truetype.Point, dx, dy float64) {
+	if len(ps) == 0 {
+		return
+	}
+	startX, startY := pointToF64Point(ps[0])
+	path.MoveTo(startX+dx, startY+dy)
+	q0X, q0Y, on0 := startX, startY, true
+	for _, p := range ps[1:] {
+		qX, qY := pointToF64Point(p)
+		on := p.Flags&0x01 != 0
+		if on {
+			if on0 {
+				path.LineTo(qX+dx, qY+dy)
+			} else {
+				path.QuadCurveTo(q0X+dx, q0Y+dy, qX+dx, qY+dy)
+			}
+		} else {
+			if on0 {
+				// No-op.
+			} else {
+				midX := (q0X + qX) / 2
+				midY := (q0Y + qY) / 2
+				path.QuadCurveTo(q0X+dx, q0Y+dy, midX+dx, midY+dy)
+			}
+		}
+		q0X, q0Y, on0 = qX, qY, on
+	}
+	// Close the curve.
+	if on0 {
+		path.LineTo(startX+dx, startY+dy)
+	} else {
+		path.QuadCurveTo(q0X+dx, q0Y+dy, startX+dx, startY+dy)
+	}
+}
+
+func pointToF64Point(p truetype.Point) (x, y float64) {
+	return fUnitsToFloat64(p.X), -fUnitsToFloat64(p.Y)
+}
+
+func fUnitsToFloat64(x fixed.Int26_6) float64 {
+	scaled := x << 2
+	return float64(scaled/256) + float64(scaled%256)/256.0
+}
+
+// FontExtents contains font metric information.
+type FontExtents struct {
+	// Ascent is the distance that the text
+	// extends above the baseline.
+	Ascent float64
+
+	// Descent is the distance that the text
+	// extends below the baseline.  The descent
+	// is given as a negative value.
+	Descent float64
+
+	// Height is the distance from the lowest
+	// descending point to the highest ascending
+	// point.
+	Height float64
+}
+
+// Extents returns the FontExtents for a font.
+// TODO needs to read this https://developer.apple.com/fonts/TrueType-Reference-Manual/RM02/Chap2.html#intro
+func Extents(font *truetype.Font, size float64) FontExtents {
+	bounds := font.Bounds(fixed.Int26_6(font.FUnitsPerEm()))
+	scale := size / float64(font.FUnitsPerEm())
+	return FontExtents{
+		Ascent:  float64(bounds.Max.Y) * scale,
+		Descent: float64(bounds.Min.Y) * scale,
+		Height:  float64(bounds.Max.Y-bounds.Min.Y) * scale,
+	}
+}

draw2dimg/README.md

@@ -0,0 +1,8 @@
+draw2d/draw2dimg
+=================
+
+[![Coverage](http://gocover.io/_badge/github.com/llgcode/draw2d/draw2dimg?0)](http://gocover.io/github.com/llgcode/draw2d/draw2dimg)
+[![GoDoc](https://godoc.org/github.com/llgcode/draw2d/draw2dimg?status.svg)](https://godoc.org/github.com/llgcode/draw2d/draw2dimg)
+
+
+draw2d implementation that generates raster images using https://github.com/golang/freetype package.

draw2dimg/curve_limit_test.go

@@ -0,0 +1,190 @@
+package draw2dimg
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"testing"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
+	"golang.org/x/image/font/gofont/goregular"
+)
+
+// font generated from icomoon.io and converted to go byte slice
+// contains only two glyphs
+// \u2716 - which should look like a cross
+// \u25cb - which should look like an empty circle
+var icoTTF = []byte{
+	0, 1, 0, 0, 0, 12, 0, 128, 0, 3, 0, 64, 71, 83, 85, 66, 219, 7, 221, 185,
+	0, 0, 0, 204, 0, 0, 0, 188, 79, 83, 47, 50, 175, 17, 51, 150, 0, 0, 1, 136,
+	0, 0, 0, 96, 99, 109, 97, 112, 37, 204, 43, 67, 0, 0, 1, 232, 0, 0, 0, 148,
+	103, 97, 115, 112, 0, 0, 0, 16, 0, 0, 2, 124, 0, 0, 0, 8, 103, 108, 121, 102,
+	163, 112, 233, 32, 0, 0, 2, 132, 0, 0, 3, 64, 104, 101, 97, 100, 15, 49, 194, 135,
+	0, 0, 5, 196, 0, 0, 0, 54, 104, 104, 101, 97, 7, 194, 3, 217, 0, 0, 5, 252,
+	0, 0, 0, 36, 104, 109, 116, 120, 14, 0, 0, 2, 0, 0, 6, 32, 0, 0, 0, 96,
+	108, 111, 99, 97, 6, 168, 5, 226, 0, 0, 6, 128, 0, 0, 0, 50, 109, 97, 120, 112,
+	0, 27, 0, 86, 0, 0, 6, 180, 0, 0, 0, 32, 110, 97, 109, 101, 108, 36, 213, 69,
+	0, 0, 6, 212, 0, 0, 1, 170, 112, 111, 115, 116, 0, 3, 0, 0, 0, 0, 8, 128,
+	0, 0, 0, 32, 0, 1, 0, 0, 0, 10, 0, 30, 0, 44, 0, 1, 108, 97, 116, 110,
+	0, 8, 0, 4, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 108, 105, 103, 97,
+	0, 8, 0, 0, 0, 1, 0, 0, 0, 1, 0, 4, 0, 4, 0, 0, 0, 1, 0, 10,
+	0, 0, 0, 1, 0, 12, 0, 3, 0, 22, 0, 54, 0, 120, 0, 1, 0, 3, 0, 8,
+	0, 17, 0, 23, 0, 2, 0, 6, 0, 18, 0, 22, 0, 5, 0, 17, 0, 16, 0, 18,
+	0, 18, 0, 22, 0, 6, 0, 6, 0, 15, 0, 8, 0, 10, 0, 14, 0, 2, 0, 6,
+	0, 38, 0, 21, 0, 15, 0, 6, 0, 9, 0, 12, 0, 16, 0, 4, 0, 20, 0, 15,
+	0, 8, 0, 11, 0, 10, 0, 8, 0, 13, 0, 10, 0, 9, 0, 21, 0, 13, 0, 6,
+	0, 9, 0, 12, 0, 16, 0, 4, 0, 7, 0, 20, 0, 19, 0, 19, 0, 16, 0, 15,
+	0, 5, 0, 1, 0, 4, 0, 22, 0, 2, 0, 23, 0, 3, 3, 85, 1, 144, 0, 5,
+	0, 0, 2, 153, 2, 204, 0, 0, 0, 143, 2, 153, 2, 204, 0, 0, 1, 235, 0, 51,
+	1, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
+	160, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 39, 23,
+	3, 192, 255, 192, 0, 64, 3, 192, 0, 64, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 28,
+	0, 1, 0, 3, 0, 0, 0, 28, 0, 3, 0, 1, 0, 0, 0, 28, 0, 4, 0, 120,
+	0, 0, 0, 26, 0, 16, 0, 3, 0, 10, 0, 1, 0, 32, 0, 45, 0, 51, 0, 101,
+	0, 105, 0, 108, 0, 111, 0, 117, 37, 203, 39, 23, 255, 253, 255, 255, 0, 0, 0, 0,
+	0, 32, 0, 45, 0, 51, 0, 97, 0, 104, 0, 107, 0, 110, 0, 114, 37, 203, 39, 22,
+	255, 253, 255, 255, 0, 1, 255, 227, 255, 215, 255, 210, 255, 165, 255, 163, 255, 162, 255, 161,
+	255, 159, 218, 74, 217, 0, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1,
+	255, 255, 0, 15, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57,
+	1, 0, 0, 0, 0, 2, 0, 0, 255, 192, 4, 0, 3, 192, 0, 27, 0, 55, 0, 0,
+	1, 34, 7, 14, 1, 7, 6, 21, 20, 23, 30, 1, 23, 22, 51, 50, 55, 62, 1, 55,
+	54, 53, 52, 39, 46, 1, 39, 38, 3, 34, 39, 46, 1, 39, 38, 53, 52, 55, 62, 1,
+	55, 54, 51, 50, 23, 30, 1, 23, 22, 21, 20, 7, 14, 1, 7, 6, 2, 0, 106, 93,
+	94, 139, 40, 40, 40, 40, 139, 94, 93, 106, 106, 93, 94, 139, 40, 40, 40, 40, 139, 94,
+	93, 106, 80, 69, 70, 105, 30, 30, 30, 30, 105, 70, 69, 80, 80, 69, 70, 105, 30, 30,
+	30, 30, 105, 70, 69, 3, 192, 40, 40, 139, 94, 93, 106, 106, 93, 94, 139, 40, 40, 40,
+	40, 139, 94, 93, 106, 106, 93, 94, 139, 40, 40, 252, 128, 30, 30, 105, 70, 69, 80, 80,
+	69, 70, 105, 30, 30, 30, 30, 105, 70, 69, 80, 80, 69, 70, 105, 30, 30, 0, 0, 0,
+	0, 1, 0, 2, 255, 194, 3, 254, 3, 190, 0, 83, 0, 0, 37, 56, 1, 49, 9, 1,
+	56, 1, 49, 62, 1, 55, 54, 38, 47, 1, 46, 1, 7, 14, 1, 7, 56, 1, 49, 9,
+	1, 56, 1, 49, 46, 1, 39, 38, 6, 15, 1, 14, 1, 23, 30, 1, 23, 56, 1, 49,
+	9, 1, 56, 1, 49, 14, 1, 7, 6, 22, 31, 1, 30, 1, 55, 62, 1, 55, 56, 1,
+	49, 9, 1, 56, 1, 49, 30, 1, 23, 22, 54, 63, 1, 62, 1, 39, 46, 1, 3, 247,
+	254, 201, 1, 55, 2, 4, 1, 3, 3, 7, 147, 7, 18, 9, 3, 6, 2, 254, 201, 254,
+	201, 2, 6, 3, 9, 18, 7, 147, 7, 3, 3, 1, 4, 2, 1, 55, 254, 201, 2, 4,
+	1, 3, 3, 7, 147, 7, 18, 9, 3, 6, 2, 1, 55, 1, 55, 2, 6, 3, 9, 18,
+	7, 147, 7, 3, 3, 1, 4, 137, 1, 55, 1, 55, 2, 6, 3, 9, 18, 7, 147, 7,
+	3, 3, 1, 4, 2, 254, 201, 1, 55, 2, 4, 1, 3, 3, 7, 147, 7, 18, 9, 3,
+	6, 2, 254, 201, 254, 201, 2, 6, 3, 9, 18, 7, 147, 7, 3, 3, 1, 4, 2, 1,
+	55, 254, 201, 2, 4, 1, 3, 3, 7, 147, 7, 18, 9, 3, 6, 0, 0, 1, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 55, 57, 1, 0, 0, 0, 0, 1, 0, 0,
+	0, 1, 0, 0, 32, 120, 21, 165, 95, 15, 60, 245, 0, 11, 4, 0, 0, 0, 0, 0,
+	214, 9, 63, 5, 0, 0, 0, 0, 214, 9, 63, 5, 0, 0, 255, 192, 4, 0, 3, 192,
+	0, 0, 0, 8, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 3, 192, 255, 192,
+	0, 0, 4, 0, 0, 0, 0, 0, 4, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 24, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 2,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 20, 0, 30, 0, 40, 0, 50, 0, 60,
+	0, 70, 0, 80, 0, 90, 0, 100, 0, 110, 0, 120, 0, 130, 0, 140, 0, 150, 0, 160,
+	0, 170, 0, 180, 0, 190, 0, 200, 1, 32, 1, 150, 1, 160, 0, 0, 0, 1, 0, 0,
+	0, 24, 0, 84, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 0, 174, 0, 1, 0, 0, 0, 0,
+	0, 1, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 7, 0, 123, 0, 1,
+	0, 0, 0, 0, 0, 3, 0, 10, 0, 63, 0, 1, 0, 0, 0, 0, 0, 4, 0, 10,
+	0, 144, 0, 1, 0, 0, 0, 0, 0, 5, 0, 11, 0, 30, 0, 1, 0, 0, 0, 0,
+	0, 6, 0, 10, 0, 93, 0, 1, 0, 0, 0, 0, 0, 10, 0, 26, 0, 174, 0, 3,
+	0, 1, 4, 9, 0, 1, 0, 20, 0, 10, 0, 3, 0, 1, 4, 9, 0, 2, 0, 14,
+	0, 130, 0, 3, 0, 1, 4, 9, 0, 3, 0, 20, 0, 73, 0, 3, 0, 1, 4, 9,
+	0, 4, 0, 20, 0, 154, 0, 3, 0, 1, 4, 9, 0, 5, 0, 22, 0, 41, 0, 3,
+	0, 1, 4, 9, 0, 6, 0, 20, 0, 103, 0, 3, 0, 1, 4, 9, 0, 10, 0, 52,
+	0, 200, 105, 99, 111, 45, 112, 101, 110, 101, 103, 111, 0, 105, 0, 99, 0, 111, 0, 45,
+	0, 112, 0, 101, 0, 110, 0, 101, 0, 103, 0, 111, 86, 101, 114, 115, 105, 111, 110, 32,
+	49, 46, 48, 0, 86, 0, 101, 0, 114, 0, 115, 0, 105, 0, 111, 0, 110, 0, 32, 0,
+	49, 0, 46, 0, 48, 105, 99, 111, 45, 112, 101, 110, 101, 103, 111, 0, 105, 0, 99, 0,
+	111, 0, 45, 0, 112, 0, 101, 0, 110, 0, 101, 0, 103, 0, 111, 105, 99, 111, 45, 112,
+	101, 110, 101, 103, 111, 0, 105, 0, 99, 0, 111, 0, 45, 0, 112, 0, 101, 0, 110, 0,
+	101, 0, 103, 0, 111, 82, 101, 103, 117, 108, 97, 114, 0, 82, 0, 101, 0, 103, 0, 117,
+	0, 108, 0, 97, 0, 114, 105, 99, 111, 45, 112, 101, 110, 101, 103, 111, 0, 105, 0, 99,
+	0, 111, 0, 45, 0, 112, 0, 101, 0, 110, 0, 101, 0, 103, 0, 111, 70, 111, 110, 116,
+	32, 103, 101, 110, 101, 114, 97, 116, 101, 100, 32, 98, 121, 32, 73, 99, 111, 77, 111, 111,
+	110, 46, 0, 70, 0, 111, 0, 110, 0, 116, 0, 32, 0, 103, 0, 101, 0, 110, 0, 101,
+	0, 114, 0, 97, 0, 116, 0, 101, 0, 100, 0, 32, 0, 98, 0, 121, 0, 32, 0, 73,
+	0, 99, 0, 111, 0, 77, 0, 111, 0, 111, 0, 110, 0, 46, 0, 0, 0, 3, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+}
+
+type customFontCache map[string]*truetype.Font
+
+func (fc customFontCache) Store(fd draw2d.FontData, font *truetype.Font) {
+	fc[fd.Name] = font
+}
+
+func (fc customFontCache) Load(fd draw2d.FontData) (*truetype.Font, error) {
+	font, stored := fc[fd.Name]
+	if !stored {
+		return nil, fmt.Errorf("font %s is not stored in font cache", fd.Name)
+	}
+	return font, nil
+}
+
+func initFontCache() { // init font cache
+	fontCache := customFontCache{}
+	// add gofont to cache
+	gofont, err := truetype.Parse(goregular.TTF)
+	if err != nil {
+		panic(err)
+	}
+	fontCache.Store(draw2d.FontData{Name: "goregular"}, gofont)
+	// add icofont to cache
+	icofont, err := truetype.Parse(icoTTF)
+	if err != nil {
+		panic(err)
+	}
+	fontCache.Store(draw2d.FontData{Name: "ico"}, icofont)
+
+	draw2d.SetFontCache(fontCache)
+}
+
+func TestCurveIndexOutOfRange(t *testing.T) {
+
+	initFontCache()
+
+	// Initialize the graphic context on an RGBA image
+	dest := image.NewRGBA(image.Rect(0, 0, 512, 512))
+	gc := NewGraphicContext(dest)
+
+	// background
+	gc.SetFillColor(color.RGBA{0xef, 0xef, 0xef, 0xff})
+	draw2dkit.Rectangle(gc, 0, 0, 512, 512)
+	gc.Fill()
+
+	// text
+	gc.SetFontSize(20)
+	gc.SetFillColor(color.RGBA{0x10, 0x10, 0x10, 0xff})
+	gc.SetFontData(draw2d.FontData{Name: "goregular"})
+
+	// gc.FillStringAt("Hello", 128, 120) // this works well
+
+	gc.SetFontData(draw2d.FontData{Name: "ico"})
+	gc.FillStringAt("\u25cb", 128, 150) // this also works
+	gc.FillStringAt("\u2716", 128, 170) // Works now
+
+	SaveToPngFile("_test_hello.png", dest)
+}

draw2dimg/fileutil.go

@@ -1,4 +1,4 @@
-package draw2d
+package draw2dimg
 
 import (
 	"bufio"

draw2dimg/ftgc.go

@@ -0,0 +1,449 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 21/11/2010 by Laurent Le Goff
+
+package draw2dimg
+
+import (
+	"image"
+	"image/color"
+	"log"
+	"math"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dbase"
+	"git.fromouter.space/crunchy-rocks/emoji"
+
+	"git.fromouter.space/crunchy-rocks/freetype/raster"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
+
+	"golang.org/x/image/draw"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/f64"
+	"golang.org/x/image/math/fixed"
+)
+
+// Painter implements the freetype raster.Painter and has a SetColor method like the RGBAPainter
+type Painter interface {
+	raster.Painter
+	SetColor(color color.Color)
+}
+
+// GraphicContext is the implementation of draw2d.GraphicContext for a raster image
+type GraphicContext struct {
+	*draw2dbase.StackGraphicContext
+	img              draw.Image
+	painter          Painter
+	fillRasterizer   *raster.Rasterizer
+	strokeRasterizer *raster.Rasterizer
+	FontCache        draw2d.FontCache
+	glyphCache       draw2dbase.GlyphCache
+	glyphBuf         *truetype.GlyphBuf
+	DPI              int
+	Emojis           emoji.Table
+}
+
+// ImageFilter defines the type of filter to use
+type ImageFilter int
+
+const (
+	// LinearFilter defines a linear filter
+	LinearFilter ImageFilter = iota
+	// BilinearFilter defines a bilinear filter
+	BilinearFilter
+	// BicubicFilter defines a bicubic filter
+	BicubicFilter
+)
+
+// NewGraphicContext creates a new Graphic context from an image.
+func NewGraphicContext(img draw.Image) *GraphicContext {
+	var painter Painter
+	switch selectImage := img.(type) {
+	case *image.RGBA:
+		painter = raster.NewRGBAPainter(selectImage)
+	default:
+		panic("Image type not supported")
+	}
+	return NewGraphicContextWithPainter(img, painter)
+}
+
+// NewGraphicContextWithPainter creates a new Graphic context from an image and a Painter (see Freetype-go)
+func NewGraphicContextWithPainter(img draw.Image, painter Painter) *GraphicContext {
+	width, height := img.Bounds().Dx(), img.Bounds().Dy()
+	dpi := 92
+	gc := &GraphicContext{
+		draw2dbase.NewStackGraphicContext(),
+		img,
+		painter,
+		raster.NewRasterizer(width, height),
+		raster.NewRasterizer(width, height),
+		draw2d.GetGlobalFontCache(),
+		draw2dbase.NewGlyphCache(),
+		&truetype.GlyphBuf{},
+		dpi,
+		make(emoji.Table),
+	}
+	return gc
+}
+
+// GetDPI returns the resolution of the Image GraphicContext
+func (gc *GraphicContext) GetDPI() int {
+	return gc.DPI
+}
+
+// Clear fills the current canvas with a default transparent color
+func (gc *GraphicContext) Clear() {
+	width, height := gc.img.Bounds().Dx(), gc.img.Bounds().Dy()
+	gc.ClearRect(0, 0, width, height)
+}
+
+// ClearRect fills the current canvas with a default transparent color at the specified rectangle
+func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int) {
+	imageColor := image.NewUniform(gc.Current.FillColor)
+	draw.Draw(gc.img, image.Rect(x1, y1, x2, y2), imageColor, image.ZP, draw.Over)
+}
+
+// DrawImage draws an image into dest using an affine transformation matrix, an op and a filter
+func DrawImage(src image.Image, dest draw.Image, tr draw2d.Matrix, op draw.Op, filter ImageFilter) {
+	var transformer draw.Transformer
+	switch filter {
+	case LinearFilter:
+		transformer = draw.NearestNeighbor
+	case BilinearFilter:
+		transformer = draw.BiLinear
+	case BicubicFilter:
+		transformer = draw.CatmullRom
+	}
+	transformer.Transform(dest, f64.Aff3{tr[0], tr[1], tr[4], tr[2], tr[3], tr[5]}, src, src.Bounds(), op, nil)
+}
+
+// DrawImage draws the raster image in the current canvas
+func (gc *GraphicContext) DrawImage(img image.Image) {
+	DrawImage(img, gc.img, gc.Current.Tr, draw.Over, BilinearFilter)
+}
+
+// FillString draws the text at point (0, 0)
+func (gc *GraphicContext) FillString(text string) (width float64) {
+	return gc.FillStringAt(text, 0, 0)
+}
+
+const emojiSpacing = 10
+const emojiScale = 110
+
+// FillStringAt draws the text at the specified point (x, y)
+func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64) {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	fontName := gc.GetFontName()
+	for fragment := range gc.Emojis.Iterate(text) {
+		if fragment.IsEmoji {
+			img, err := LoadFromPngFile(fragment.Emoji.Path)
+			if err == nil {
+				gc.Save()
+				scale := gc.GetFontSize() / 100
+				gc.Translate(x+scale*emojiSpacing, y-scale*emojiScale)
+				gc.Scale(scale, scale)
+				gc.DrawImage(img)
+				gc.Restore()
+				x += scale*float64(img.Bounds().Size().X) + scale*emojiSpacing*2
+			}
+			continue
+		}
+		index := f.Index(fragment.Rune)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		glyph := gc.glyphCache.Fetch(gc, fontName, fragment.Rune)
+		x += glyph.Fill(gc, x, y)
+		prev, hasPrev = index, true
+	}
+	return x - startx
+}
+
+// StrokeString draws the contour of the text at point (0, 0)
+func (gc *GraphicContext) StrokeString(text string) (width float64) {
+	return gc.StrokeStringAt(text, 0, 0)
+}
+
+// StrokeStringAt draws the contour of the text at point (x, y)
+func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float64) {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	fontName := gc.GetFontName()
+	for fragment := range gc.Emojis.Iterate(text) {
+		if fragment.IsEmoji {
+			img, err := LoadFromPngFile(fragment.Emoji.Path)
+			if err == nil {
+				gc.Save()
+				scale := gc.GetFontSize() / 100
+				gc.Translate(x+scale*emojiSpacing, y-scale*emojiScale)
+				gc.Scale(scale, scale)
+				gc.DrawImage(img)
+				gc.Restore()
+				x += scale*float64(img.Bounds().Size().X) + scale*emojiSpacing*2
+			}
+			continue
+		}
+		index := f.Index(fragment.Rune)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		glyph := gc.glyphCache.Fetch(gc, fontName, fragment.Rune)
+		x += glyph.Stroke(gc, x, y)
+		prev, hasPrev = index, true
+	}
+	return x - startx
+}
+
+func (gc *GraphicContext) loadCurrentFont() (*truetype.Font, error) {
+	font, err := gc.FontCache.Load(gc.Current.FontData)
+	if err != nil {
+		font, err = gc.FontCache.Load(draw2dbase.DefaultFontData)
+	}
+	if font != nil {
+		gc.SetFont(font)
+		gc.SetFontSize(gc.Current.FontSize)
+	}
+	return font, err
+}
+
+// p is a truetype.Point measured in FUnits and positive Y going upwards.
+// The returned value is the same thing measured in floating point and positive Y
+// going downwards.
+
+func (gc *GraphicContext) drawGlyph(glyph truetype.Index, dx, dy float64) error {
+	if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), glyph, font.HintingNone); err != nil {
+		return err
+	}
+	e0 := 0
+	for _, e1 := range gc.glyphBuf.Ends {
+		DrawContour(gc, gc.glyphBuf.Points[e0:e1], dx, dy)
+		e0 = e1
+	}
+	return nil
+}
+
+// CreateStringPath creates a path from the string s at x, y, and returns the string width.
+// The text is placed so that the left edge of the em square of the first character of s
+// and the baseline intersect at x, y. The majority of the affected pixels will be
+// above and to the right of the point, but some may be below or to the left.
+// For example, drawing a string that starts with a 'J' in an italic font may
+// affect pixels below and left of the point.
+func (gc *GraphicContext) CreateStringPath(s string, x, y float64) float64 {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	for _, rune := range s {
+		index := f.Index(rune)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		err := gc.drawGlyph(index, x, y)
+		if err != nil {
+			log.Println(err)
+			return startx - x
+		}
+		x += fUnitsToFloat64(f.HMetric(fixed.Int26_6(gc.Current.Scale), index).AdvanceWidth)
+		prev, hasPrev = index, true
+	}
+	return x - startx
+}
+
+// GetStringBounds returns the approximate pixel bounds of the string s at x, y.
+// The the left edge of the em square of the first character of s
+// and the baseline intersect at 0, 0 in the returned coordinates.
+// Therefore the top and left coordinates may well be negative.
+func (gc *GraphicContext) GetStringBounds(s string) (left, top, right, bottom float64) {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0, 0, 0, 0
+	}
+	top, left, bottom, right = 10e6, 10e6, -10e6, -10e6
+	cursor := 0.0
+	prev, hasPrev := truetype.Index(0), false
+	// Get sample letter for approximated emoji calculations
+	const letter = 'M'
+	mindex := f.Index(letter)
+	mtop, mleft, mheight, mwidth := 10e6, 10e6, -10e6, -10e6
+	if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), mindex, font.HintingNone); err != nil {
+		log.Println(err)
+		return 0, 0, 0, 0
+	}
+	e0 := 0
+	for _, e1 := range gc.glyphBuf.Ends {
+		ps := gc.glyphBuf.Points[e0:e1]
+		for _, p := range ps {
+			x, y := pointToF64Point(p)
+			mtop = math.Min(mtop, y)
+			mheight = math.Max(mheight, y)
+			mleft = math.Min(mleft, x)
+			mwidth = math.Max(mwidth, x)
+		}
+	}
+	mtop *= 1.2
+	mwidth *= 1.55
+	mheight += math.Abs(mtop-mheight) * 0.2
+	// Actually iterate through the string
+	for fragment := range gc.Emojis.Iterate(s) {
+		if fragment.IsEmoji {
+			cursor += mwidth
+			top = math.Min(top, mtop)
+			bottom = math.Max(bottom, mheight)
+			left = math.Min(left, mleft)
+			right = math.Max(right, cursor)
+			continue
+		}
+		index := f.Index(fragment.Rune)
+		if hasPrev {
+			cursor += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), index, font.HintingNone); err != nil {
+			log.Println(err)
+			return 0, 0, 0, 0
+		}
+		e0 := 0
+		for _, e1 := range gc.glyphBuf.Ends {
+			ps := gc.glyphBuf.Points[e0:e1]
+			for _, p := range ps {
+				x, y := pointToF64Point(p)
+				top = math.Min(top, y)
+				bottom = math.Max(bottom, y)
+				left = math.Min(left, x+cursor)
+				right = math.Max(right, x+cursor)
+			}
+		}
+		cursor += fUnitsToFloat64(f.HMetric(fixed.Int26_6(gc.Current.Scale), index).AdvanceWidth)
+		prev, hasPrev = index, true
+	}
+	return left, top, right, bottom
+}
+
+// recalc recalculates scale and bounds values from the font size, screen
+// resolution and font metrics, and invalidates the glyph cache.
+func (gc *GraphicContext) recalc() {
+	gc.Current.Scale = gc.Current.FontSize * float64(gc.DPI) * (64.0 / 72.0)
+}
+
+// SetDPI sets the screen resolution in dots per inch.
+func (gc *GraphicContext) SetDPI(dpi int) {
+	gc.DPI = dpi
+	gc.recalc()
+}
+
+// SetFont sets the font used to draw text.
+func (gc *GraphicContext) SetFont(font *truetype.Font) {
+	gc.Current.Font = font
+}
+
+// SetFontSize sets the font size in points (as in ``a 12 point font'').
+func (gc *GraphicContext) SetFontSize(fontSize float64) {
+	gc.Current.FontSize = fontSize
+	gc.recalc()
+}
+
+func (gc *GraphicContext) paint(rasterizer *raster.Rasterizer, color color.Color) {
+	gc.painter.SetColor(color)
+	rasterizer.Rasterize(gc.painter)
+	rasterizer.Clear()
+	gc.Current.Path.Clear()
+}
+
+// Stroke strokes the paths with the color specified by SetStrokeColor
+func (gc *GraphicContext) Stroke(paths ...*draw2d.Path) {
+	paths = append(paths, gc.Current.Path)
+	gc.strokeRasterizer.UseNonZeroWinding = true
+
+	stroker := draw2dbase.NewLineStroker(gc.Current.Cap, gc.Current.Join, draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: FtLineBuilder{Adder: gc.strokeRasterizer}})
+	stroker.HalfLineWidth = gc.Current.LineWidth / 2
+
+	var liner draw2dbase.Flattener
+	if gc.Current.Dash != nil && len(gc.Current.Dash) > 0 {
+		liner = draw2dbase.NewDashConverter(gc.Current.Dash, gc.Current.DashOffset, stroker)
+	} else {
+		liner = stroker
+	}
+	for _, p := range paths {
+		draw2dbase.Flatten(p, liner, gc.Current.Tr.GetScale())
+	}
+
+	gc.paint(gc.strokeRasterizer, gc.Current.StrokeColor)
+}
+
+// Fill fills the paths with the color specified by SetFillColor
+func (gc *GraphicContext) Fill(paths ...*draw2d.Path) {
+	paths = append(paths, gc.Current.Path)
+	gc.fillRasterizer.UseNonZeroWinding = gc.Current.FillRule == draw2d.FillRuleWinding
+
+	/**** first method ****/
+	flattener := draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: FtLineBuilder{Adder: gc.fillRasterizer}}
+	for _, p := range paths {
+		draw2dbase.Flatten(p, flattener, gc.Current.Tr.GetScale())
+	}
+
+	gc.paint(gc.fillRasterizer, gc.Current.FillColor)
+}
+
+// FillStroke first fills the paths and than strokes them
+func (gc *GraphicContext) FillStroke(paths ...*draw2d.Path) {
+	paths = append(paths, gc.Current.Path)
+	gc.fillRasterizer.UseNonZeroWinding = gc.Current.FillRule == draw2d.FillRuleWinding
+	gc.strokeRasterizer.UseNonZeroWinding = true
+
+	flattener := draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: FtLineBuilder{Adder: gc.fillRasterizer}}
+
+	stroker := draw2dbase.NewLineStroker(gc.Current.Cap, gc.Current.Join, draw2dbase.Transformer{Tr: gc.Current.Tr, Flattener: FtLineBuilder{Adder: gc.strokeRasterizer}})
+	stroker.HalfLineWidth = gc.Current.LineWidth / 2
+
+	var liner draw2dbase.Flattener
+	if gc.Current.Dash != nil && len(gc.Current.Dash) > 0 {
+		liner = draw2dbase.NewDashConverter(gc.Current.Dash, gc.Current.DashOffset, stroker)
+	} else {
+		liner = stroker
+	}
+
+	demux := draw2dbase.DemuxFlattener{Flatteners: []draw2dbase.Flattener{flattener, liner}}
+	for _, p := range paths {
+		draw2dbase.Flatten(p, demux, gc.Current.Tr.GetScale())
+	}
+
+	// Fill
+	gc.paint(gc.fillRasterizer, gc.Current.FillColor)
+	// Stroke
+	gc.paint(gc.strokeRasterizer, gc.Current.StrokeColor)
+}
+
+func toFtCap(c draw2d.LineCap) raster.Capper {
+	switch c {
+	case draw2d.RoundCap:
+		return raster.RoundCapper
+	case draw2d.ButtCap:
+		return raster.ButtCapper
+	case draw2d.SquareCap:
+		return raster.SquareCapper
+	}
+	return raster.RoundCapper
+}
+
+func toFtJoin(j draw2d.LineJoin) raster.Joiner {
+	switch j {
+	case draw2d.RoundJoin:
+		return raster.RoundJoiner
+	case draw2d.BevelJoin:
+		return raster.BevelJoiner
+	}
+	return raster.RoundJoiner
+}

draw2dimg/ftpath.go

@@ -0,0 +1,30 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 13/12/2010 by Laurent Le Goff
+
+package draw2dimg
+
+import (
+	"git.fromouter.space/crunchy-rocks/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+type FtLineBuilder struct {
+	Adder raster.Adder
+}
+
+func (liner FtLineBuilder) MoveTo(x, y float64) {
+	liner.Adder.Start(fixed.Point26_6{X: fixed.Int26_6(x * 64), Y: fixed.Int26_6(y * 64)})
+}
+
+func (liner FtLineBuilder) LineTo(x, y float64) {
+	liner.Adder.Add1(fixed.Point26_6{X: fixed.Int26_6(x * 64), Y: fixed.Int26_6(y * 64)})
+}
+
+func (liner FtLineBuilder) LineJoin() {
+}
+
+func (liner FtLineBuilder) Close() {
+}
+
+func (liner FtLineBuilder) End() {
+}

draw2dimg/text.go

@@ -0,0 +1,82 @@
+package draw2dimg
+
+import (
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// DrawContour draws the given closed contour at the given sub-pixel offset.
+func DrawContour(path draw2d.PathBuilder, ps []truetype.Point, dx, dy float64) {
+	if len(ps) == 0 {
+		return
+	}
+	startX, startY := pointToF64Point(ps[0])
+	path.MoveTo(startX+dx, startY+dy)
+	q0X, q0Y, on0 := startX, startY, true
+	for _, p := range ps[1:] {
+		qX, qY := pointToF64Point(p)
+		on := p.Flags&0x01 != 0
+		if on {
+			if on0 {
+				path.LineTo(qX+dx, qY+dy)
+			} else {
+				path.QuadCurveTo(q0X+dx, q0Y+dy, qX+dx, qY+dy)
+			}
+		} else {
+			if on0 {
+				// No-op.
+			} else {
+				midX := (q0X + qX) / 2
+				midY := (q0Y + qY) / 2
+				path.QuadCurveTo(q0X+dx, q0Y+dy, midX+dx, midY+dy)
+			}
+		}
+		q0X, q0Y, on0 = qX, qY, on
+	}
+	// Close the curve.
+	if on0 {
+		path.LineTo(startX+dx, startY+dy)
+	} else {
+		path.QuadCurveTo(q0X+dx, q0Y+dy, startX+dx, startY+dy)
+	}
+}
+
+func pointToF64Point(p truetype.Point) (x, y float64) {
+	return fUnitsToFloat64(p.X), -fUnitsToFloat64(p.Y)
+}
+
+func fUnitsToFloat64(x fixed.Int26_6) float64 {
+	scaled := x << 2
+	return float64(scaled/256) + float64(scaled%256)/256.0
+}
+
+// FontExtents contains font metric information.
+type FontExtents struct {
+	// Ascent is the distance that the text
+	// extends above the baseline.
+	Ascent float64
+
+	// Descent is the distance that the text
+	// extends below the baseline.  The descent
+	// is given as a negative value.
+	Descent float64
+
+	// Height is the distance from the lowest
+	// descending point to the highest ascending
+	// point.
+	Height float64
+}
+
+// Extents returns the FontExtents for a font.
+// TODO needs to read this https://developer.apple.com/fonts/TrueType-Reference-Manual/RM02/Chap2.html#intro
+func Extents(font *truetype.Font, size float64) FontExtents {
+	bounds := font.Bounds(fixed.Int26_6(font.FUnitsPerEm()))
+	scale := size / float64(font.FUnitsPerEm())
+	return FontExtents{
+		Ascent:  float64(bounds.Max.Y) * scale,
+		Descent: float64(bounds.Min.Y) * scale,
+		Height:  float64(bounds.Max.Y-bounds.Min.Y) * scale,
+	}
+}

draw2dkit/README.md

@@ -0,0 +1,7 @@
+draw2d/draw2dkit
+=================
+
+[![Coverage](http://gocover.io/_badge/github.com/llgcode/draw2d/draw2dkit?0)](http://gocover.io/github.com/llgcode/draw2d/draw2dkit)
+[![GoDoc](https://godoc.org/github.com/llgcode/draw2d/draw2dkit?status.svg)](https://godoc.org/github.com/llgcode/draw2d/draw2dkit)
+
+Util package that help drawing common vectorial draw.

draw2dkit/draw2dkit.go

@@ -1,16 +1,17 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
 
-//high level path creation
+// Package draw2dkit provides helpers to draw common figures using a Path
-
+package draw2dkit
-package draw2d
 
 import (
 	"math"
+
+	"github.com/llgcode/draw2d"
 )
 
-// Rect draws a rectangle between (x1,y1) and (x2,y2)
+// Rectangle draws a rectangle using a path between (x1,y1) and (x2,y2)
-func Rect(path Path, x1, y1, x2, y2 float64) {
+func Rectangle(path draw2d.PathBuilder, x1, y1, x2, y2 float64) {
 	path.MoveTo(x1, y1)
 	path.LineTo(x2, y1)
 	path.LineTo(x2, y2)
@@ -18,8 +19,8 @@ func Rect(path Path, x1, y1, x2, y2 float64) {
 	path.Close()
 }
 
-// RoundRect draws a rectangle between (x1,y1) and (x2,y2) with rounded corners
+// RoundedRectangle draws a rectangle using a path between (x1,y1) and (x2,y2)
-func RoundRect(path Path, x1, y1, x2, y2, arcWidth, arcHeight float64) {
+func RoundedRectangle(path draw2d.PathBuilder, x1, y1, x2, y2, arcWidth, arcHeight float64) {
 	arcWidth = arcWidth / 2
 	arcHeight = arcHeight / 2
 	path.MoveTo(x1, y1+arcHeight)
@@ -33,16 +34,14 @@ func RoundRect(path Path, x1, y1, x2, y2, arcWidth, arcHeight float64) {
 	path.Close()
 }
 
-// Ellipse is drawn with center (cx,cy) and radius (rx,ry)
+// Ellipse draws an ellipse using a path with center (cx,cy) and radius (rx,ry)
-func Ellipse(path Path, cx, cy, rx, ry float64) {
+func Ellipse(path draw2d.PathBuilder, cx, cy, rx, ry float64) {
-	path.MoveTo(cx-rx, cy)
 	path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2)
 	path.Close()
 }
 
-// Circle is drawn with center (cx,cy) and radius
+// Circle draws a circle using a path with center (cx,cy) and radius
-func Circle(path Path, cx, cy, radius float64) {
+func Circle(path draw2d.PathBuilder, cx, cy, radius float64) {
-	path.MoveTo(cx-radius, cy)
 	path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2)
 	path.Close()
 }

draw2dkit/draw2dkit_test.go

@@ -0,0 +1,29 @@
+package draw2dkit
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"github.com/llgcode/draw2d/draw2dimg"
+)
+
+func TestCircle(t *testing.T) {
+	width := 200
+	height := 200
+	img := image.NewRGBA(image.Rect(0, 0, width, height))
+	gc := draw2dimg.NewGraphicContext(img)
+
+	gc.SetStrokeColor(color.NRGBA{255, 255, 255, 255})
+	gc.SetFillColor(color.NRGBA{255, 255, 255, 255})
+	gc.Clear()
+
+	gc.SetStrokeColor(color.NRGBA{255, 0, 0, 255})
+	gc.SetLineWidth(1)
+
+	// Draw a circle
+	Circle(gc, 100, 100, 50)
+	gc.Stroke()
+
+	draw2dimg.SaveToPngFile("../output/draw2dkit/TestCircle.png", img)
+}

draw2dpdf/README.md

@@ -10,7 +10,7 @@ The following Go code generates a simple drawing and saves it to a pdf document:
 ```go
 // Initialize the graphic context on an RGBA image
 dest := draw2dpdf.NewPdf("L", "mm", "A4")
-gc := draw2d.NewGraphicContext(dest)
+gc := draw2dpdf.NewGraphicContext(dest)
 
 // Set some properties
 gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})

draw2dpdf/doc.go

@@ -10,7 +10,7 @@
 // pdf document:
 //   // Initialize the graphic context on an RGBA image
 //   dest := draw2dpdf.NewPdf("L", "mm", "A4")
-//   gc := draw2d.NewGraphicContext(dest)
+//   gc := draw2dpdf.NewGraphicContext(dest)
 //
 //   // Set some properties
 //   gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
@@ -28,7 +28,7 @@
 //   draw2dpdf.SaveToPdfFile("hello.pdf", dest)
 //
 // There are more examples here:
-// https://gopkg.in/llgcode/draw2d.v1/tree/master/samples
+// https://github.com/llgcode/draw2d/tree/master/samples
 //
 // Alternative backends
 //

draw2dpdf/gc.go

@@ -14,10 +14,12 @@ import (
 	"os"
 	"strconv"
 
-	"code.google.com/p/freetype-go/freetype/truetype"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
 
 	"github.com/jung-kurt/gofpdf"
-	"gopkg.in/llgcode/draw2d.v1"
+	"github.com/llgcode/draw2d"
+	"github.com/llgcode/draw2d/draw2dbase"
+	"github.com/llgcode/draw2d/draw2dkit"
 )
 
 const (
@@ -27,11 +29,11 @@ const (
 )
 
 var (
-	caps = map[draw2d.Cap]string{
+	caps = map[draw2d.LineCap]string{
 		draw2d.RoundCap:  "round",
 		draw2d.ButtCap:   "butt",
 		draw2d.SquareCap: "square"}
-	joins = map[draw2d.Join]string{
+	joins = map[draw2d.LineJoin]string{
 		draw2d.RoundJoin: "round",
 		draw2d.BevelJoin: "bevel",
 		draw2d.MiterJoin: "miter",
@@ -68,7 +70,7 @@ func clearRect(gc *GraphicContext, x1, y1, x2, y2 float64) {
 	x, y := gc.pdf.GetXY()
 	// cover page with white rectangle
 	gc.SetFillColor(white)
-	draw2d.Rect(gc, x1, y1, x2, y2)
+	draw2dkit.Rectangle(gc, x1, y1, x2, y2)
 	gc.Fill()
 	// restore state
 	gc.SetFillColor(f)
@@ -78,14 +80,14 @@ func clearRect(gc *GraphicContext, x1, y1, x2, y2 float64) {
 // GraphicContext implements the draw2d.GraphicContext interface
 // It provides draw2d with a pdf backend (based on gofpdf)
 type GraphicContext struct {
-	*draw2d.StackGraphicContext
+	*draw2dbase.StackGraphicContext
 	pdf *gofpdf.Fpdf
 	DPI int
 }
 
 // NewGraphicContext creates a new pdf GraphicContext
 func NewGraphicContext(pdf *gofpdf.Fpdf) *GraphicContext {
-	gc := &GraphicContext{draw2d.NewStackGraphicContext(), pdf, DPI}
+	gc := &GraphicContext{draw2dbase.NewStackGraphicContext(), pdf, DPI}
 	gc.SetDPI(DPI)
 	return gc
 }
@@ -189,27 +191,27 @@ func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (cursor floa
 }
 
 // Stroke strokes the paths with the color specified by SetStrokeColor
-func (gc *GraphicContext) Stroke(paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) Stroke(paths ...*draw2d.Path) {
 	_, _, _, alphaS := gc.Current.StrokeColor.RGBA()
 	gc.draw("D", alphaS, paths...)
-	gc.Current.Path = draw2d.NewPathStorage()
+	gc.Current.Path.Clear()
 }
 
 // Fill fills the paths with the color specified by SetFillColor
-func (gc *GraphicContext) Fill(paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) Fill(paths ...*draw2d.Path) {
 	style := "F"
-	if !gc.Current.FillRule.UseNonZeroWinding() {
+	if gc.Current.FillRule != draw2d.FillRuleWinding {
 		style += "*"
 	}
 	_, _, _, alphaF := gc.Current.FillColor.RGBA()
 	gc.draw(style, alphaF, paths...)
-	gc.Current.Path = draw2d.NewPathStorage()
+	gc.Current.Path.Clear()
 }
 
 // FillStroke first fills the paths and than strokes them
-func (gc *GraphicContext) FillStroke(paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) FillStroke(paths ...*draw2d.Path) {
 	var rule string
-	if !gc.Current.FillRule.UseNonZeroWinding() {
+	if gc.Current.FillRule != draw2d.FillRuleWinding {
 		rule = "*"
 	}
 	_, _, _, alphaS := gc.Current.StrokeColor.RGBA()
@@ -220,7 +222,7 @@ func (gc *GraphicContext) FillStroke(paths ...*draw2d.PathStorage) {
 		gc.draw("F"+rule, alphaF, paths...)
 		gc.draw("S", alphaS, paths...)
 	}
-	gc.Current.Path = draw2d.NewPathStorage()
+	gc.Current.Path.Clear()
 }
 
 var logger = log.New(os.Stdout, "", log.Lshortfile)
@@ -228,10 +230,11 @@ var logger = log.New(os.Stdout, "", log.Lshortfile)
 const alphaMax = float64(0xFFFF)
 
 // draw fills and/or strokes paths
-func (gc *GraphicContext) draw(style string, alpha uint32, paths ...*draw2d.PathStorage) {
+func (gc *GraphicContext) draw(style string, alpha uint32, paths ...*draw2d.Path) {
 	paths = append(paths, gc.Current.Path)
-	pathConverter := NewPathConverter(gc.pdf)
+	for _, p := range paths {
-	pathConverter.Convert(paths...)
+		ConvertPath(p, gc.pdf)
+	}
 	a := float64(alpha) / alphaMax
 	current, blendMode := gc.pdf.GetAlpha()
 	if a != current {
@@ -308,13 +311,13 @@ func (gc *GraphicContext) SetLineWidth(LineWidth float64) {
 }
 
 // SetLineCap sets the line cap (round, but or square)
-func (gc *GraphicContext) SetLineCap(Cap draw2d.Cap) {
+func (gc *GraphicContext) SetLineCap(Cap draw2d.LineCap) {
 	gc.StackGraphicContext.SetLineCap(Cap)
 	gc.pdf.SetLineCapStyle(caps[Cap])
 }
 
 // SetLineJoin sets the line cap (round, bevel or miter)
-func (gc *GraphicContext) SetLineJoin(Join draw2d.Join) {
+func (gc *GraphicContext) SetLineJoin(Join draw2d.LineJoin) {
 	gc.StackGraphicContext.SetLineJoin(Join)
 	gc.pdf.SetLineJoinStyle(joins[Join])
 }

draw2dpdf/path_converter.go

@@ -6,55 +6,39 @@ package draw2dpdf
 import (
 	"math"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"github.com/llgcode/draw2d"
 )
 
 const deg = 180 / math.Pi
 
-// PathConverter converts the paths to the pdf api
+// ConvertPath converts a paths to the pdf api
-type PathConverter struct {
+func ConvertPath(path *draw2d.Path, pdf Vectorizer) {
-	pdf Vectorizer
+	var startX, startY float64 = 0, 0
-}
+	i := 0
-
+	for _, cmp := range path.Components {
-// NewPathConverter constructs a PathConverter from a pdf vectorizer
+		switch cmp {
-func NewPathConverter(pdf Vectorizer) *PathConverter {
+		case draw2d.MoveToCmp:
-	return &PathConverter{pdf: pdf}
+			startX, startY = path.Points[i], path.Points[i+1]
-}
+			pdf.MoveTo(startX, startY)
-
+			i += 2
-// Convert converts the paths to the pdf api
+		case draw2d.LineToCmp:
-func (c *PathConverter) Convert(paths ...*draw2d.PathStorage) {
+			pdf.LineTo(path.Points[i], path.Points[i+1])
-	for _, path := range paths {
+			i += 2
-		j := 0
+		case draw2d.QuadCurveToCmp:
-		for _, cmd := range path.Commands {
+			pdf.CurveTo(path.Points[i], path.Points[i+1], path.Points[i+2], path.Points[i+3])
-			j = j + c.ConvertCommand(cmd, path.Vertices[j:]...)
+			i += 4
+		case draw2d.CubicCurveToCmp:
+			pdf.CurveBezierCubicTo(path.Points[i], path.Points[i+1], path.Points[i+2], path.Points[i+3], path.Points[i+4], path.Points[i+5])
+			i += 6
+		case draw2d.ArcToCmp:
+			pdf.ArcTo(path.Points[i], path.Points[i+1], path.Points[i+2], path.Points[i+3],
+				0, // degRotate
+				path.Points[i+4]*deg,                    // degStart = startAngle
+				(path.Points[i+4]-path.Points[i+5])*deg) // degEnd = startAngle-angle
+			i += 6
+		case draw2d.CloseCmp:
+			pdf.LineTo(startX, startY)
+			pdf.ClosePath()
 		}
 	}
 }
-
-// ConvertCommand converts a single path segment to the pdf api
-func (c *PathConverter) ConvertCommand(cmd draw2d.PathCmd, vertices ...float64) int {
-	switch cmd {
-	case draw2d.MoveTo:
-		c.pdf.MoveTo(vertices[0], vertices[1])
-		return 2
-	case draw2d.LineTo:
-		c.pdf.LineTo(vertices[0], vertices[1])
-		return 2
-	case draw2d.QuadCurveTo:
-		c.pdf.CurveTo(vertices[0], vertices[1], vertices[2], vertices[3])
-		return 4
-	case draw2d.CubicCurveTo:
-		c.pdf.CurveBezierCubicTo(vertices[0], vertices[1], vertices[2], vertices[3], vertices[4], vertices[5])
-		return 6
-	case draw2d.ArcTo:
-		// draw2d: angles clockwise, fpdf angles counter clockwise
-		c.pdf.ArcTo(vertices[0], vertices[1], vertices[2], vertices[3],
-			0,                              // degRotate
-			-vertices[4]*deg,               // degStart = -startAngle
-			(-vertices[4]-vertices[5])*deg) // degEnd = -startAngle-angle
-		return 6
-	default: // case draw2d.Close:
-		c.pdf.ClosePath()
-		return 0
-	}
-}

draw2dpdf/samples_test.go

@@ -7,16 +7,16 @@ package draw2dpdf_test
 import (
 	"testing"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"github.com/llgcode/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples/android"
+	"github.com/llgcode/draw2d/samples/android"
-	"gopkg.in/llgcode/draw2d.v1/samples/frameimage"
+	"github.com/llgcode/draw2d/samples/frameimage"
-	"gopkg.in/llgcode/draw2d.v1/samples/geometry"
+	"github.com/llgcode/draw2d/samples/geometry"
-	"gopkg.in/llgcode/draw2d.v1/samples/gopher"
+	"github.com/llgcode/draw2d/samples/gopher"
-	"gopkg.in/llgcode/draw2d.v1/samples/gopher2"
+	"github.com/llgcode/draw2d/samples/gopher2"
-	"gopkg.in/llgcode/draw2d.v1/samples/helloworld"
+	"github.com/llgcode/draw2d/samples/helloworld"
-	"gopkg.in/llgcode/draw2d.v1/samples/line"
+	"github.com/llgcode/draw2d/samples/line"
-	"gopkg.in/llgcode/draw2d.v1/samples/linecapjoin"
+	"github.com/llgcode/draw2d/samples/linecapjoin"
-	"gopkg.in/llgcode/draw2d.v1/samples/postscript"
+	"github.com/llgcode/draw2d/samples/postscript"
 )
 
 func TestSampleAndroid(t *testing.T) {

draw2dpdf/test_test.go

@@ -9,8 +9,8 @@ package draw2dpdf_test
 import (
 	"testing"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"github.com/llgcode/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/draw2dpdf"
+	"github.com/llgcode/draw2d/draw2dpdf"
 )
 
 type sample func(gc draw2d.GraphicContext, ext string) (string, error)

draw2dsvg/converters.go

@@ -0,0 +1,176 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 16/12/2017 by Drahoslav Bednářpackage draw2dsvg
+
+package draw2dsvg
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"image"
+	"image/color"
+	"image/png"
+	"math"
+	"strconv"
+	"strings"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+)
+
+func toSvgRGBA(c color.Color) string {
+	r, g, b, a := c.RGBA()
+	r, g, b, a = r>>8, g>>8, b>>8, a>>8
+	if a == 255 {
+		return optiSprintf("#%02X%02X%02X", r, g, b)
+	}
+	return optiSprintf("rgba(%v,%v,%v,%f)", r, g, b, float64(a)/255)
+}
+
+func toSvgLength(l float64) string {
+	if math.IsInf(l, 1) {
+		return "100%"
+	}
+	return optiSprintf("%f", l)
+}
+
+func toSvgArray(nums []float64) string {
+	arr := make([]string, len(nums))
+	for i, num := range nums {
+		arr[i] = optiSprintf("%f", num)
+	}
+	return strings.Join(arr, ",")
+}
+
+func toSvgFillRule(rule draw2d.FillRule) string {
+	return map[draw2d.FillRule]string{
+		draw2d.FillRuleEvenOdd: "evenodd",
+		draw2d.FillRuleWinding: "nonzero",
+	}[rule]
+}
+
+func toSvgPathDesc(p *draw2d.Path) string {
+	parts := make([]string, len(p.Components))
+	ps := p.Points
+	for i, cmp := range p.Components {
+		switch cmp {
+		case draw2d.MoveToCmp:
+			parts[i] = optiSprintf("M %f,%f", ps[0], ps[1])
+			ps = ps[2:]
+		case draw2d.LineToCmp:
+			parts[i] = optiSprintf("L %f,%f", ps[0], ps[1])
+			ps = ps[2:]
+		case draw2d.QuadCurveToCmp:
+			parts[i] = optiSprintf("Q %f,%f %f,%f", ps[0], ps[1], ps[2], ps[3])
+			ps = ps[4:]
+		case draw2d.CubicCurveToCmp:
+			parts[i] = optiSprintf("C %f,%f %f,%f %f,%f", ps[0], ps[1], ps[2], ps[3], ps[4], ps[5])
+			ps = ps[6:]
+		case draw2d.ArcToCmp:
+			cx, cy := ps[0], ps[1] // center
+			rx, ry := ps[2], ps[3] // radii
+			fi := ps[4] + ps[5]    // startAngle + angle
+
+			// compute endpoint
+			sinfi, cosfi := math.Sincos(fi)
+			nom := math.Hypot(ry*cosfi, rx*sinfi)
+			x := cx + (rx*ry*cosfi)/nom
+			y := cy + (rx*ry*sinfi)/nom
+
+			// compute large and sweep flags
+			large := 0
+			sweep := 0
+			if math.Abs(ps[5]) > math.Pi {
+				large = 1
+			}
+			if !math.Signbit(ps[5]) {
+				sweep = 1
+			}
+			// dirty hack to ensure whole arc is drawn
+			// if start point equals end point
+			if sweep == 1 {
+				x += 0.01 * sinfi
+				y += 0.01 * -cosfi
+			} else {
+				x += 0.01 * sinfi
+				y += 0.01 * cosfi
+			}
+
+			// rx ry x-axis-rotation large-arc-flag sweep-flag x y
+			parts[i] = optiSprintf("A %f %f %v %v %v %F %F",
+				rx, ry, 0, large, sweep, x, y,
+			)
+			ps = ps[6:]
+		case draw2d.CloseCmp:
+			parts[i] = "Z"
+		}
+	}
+	return strings.Join(parts, " ")
+}
+
+func toSvgTransform(mat draw2d.Matrix) string {
+	if mat.IsIdentity() {
+		return ""
+	}
+	if mat.IsTranslation() {
+		x, y := mat.GetTranslation()
+		return optiSprintf("translate(%f,%f)", x, y)
+	}
+	return optiSprintf("matrix(%f,%f,%f,%f,%f,%f)",
+		mat[0], mat[1], mat[2], mat[3], mat[4], mat[5],
+	)
+}
+
+func imageToSvgHref(image image.Image) string {
+	out := "data:image/png;base64,"
+	pngBuf := &bytes.Buffer{}
+	png.Encode(pngBuf, image)
+	out += base64.RawStdEncoding.EncodeToString(pngBuf.Bytes())
+	return out
+}
+
+// Do the same thing as fmt.Sprintf
+// except it uses the optimal precition for floats: (0-3) for f and (0-6) for F
+// eg.:
+// optiSprintf("%f", 3.0)               => fmt.Sprintf("%.0f", 3.0)
+// optiSprintf("%f", 3.33)              => fmt.Sprintf("%.2f", 3.33)
+// optiSprintf("%f", 3.3001)            => fmt.Sprintf("%.1f", 3.3001)
+// optiSprintf("%f", 3.333333333333333) => fmt.Sprintf("%.3f", 3.333333333333333)
+// optiSprintf("%F", 3.333333333333333) => fmt.Sprintf("%.6f", 3.333333333333333)
+func optiSprintf(format string, a ...interface{}) string {
+	chunks := strings.Split(format, "%")
+	newChunks := make([]string, len(chunks))
+	for i, chunk := range chunks {
+		if i != 0 {
+			verb := chunk[0]
+			if verb == 'f' || verb == 'F' {
+				num := a[i-1].(float64)
+				p := strconv.Itoa(getPrec(num, verb == 'F'))
+				chunk = strings.Replace(chunk, string(verb), "."+p+"f", 1)
+			}
+		}
+		newChunks[i] = chunk
+	}
+	format = strings.Join(newChunks, "%")
+	return fmt.Sprintf(format, a...)
+}
+
+// TODO needs test, since it is not quiet right
+func getPrec(num float64, better bool) int {
+	max := 3
+	eps := 0.0005
+	if better {
+		max = 6
+		eps = 0.0000005
+	}
+	prec := 0
+	for math.Mod(num, 1) > eps {
+		num *= 10
+		eps *= 10
+		prec++
+	}
+
+	if max < prec {
+		return max
+	}
+	return prec
+}

draw2dsvg/doc.go

@@ -0,0 +1,11 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 16/12/2017 by Drahoslav Bednář
+
+// Package draw2svg provides a graphic context that can draw
+// vector graphics and text on svg file.
+//
+// Quick Start
+// The following Go code geneartes a simple drawing and saves it
+// to a svg document:
+// TODO
+package draw2dsvg

draw2dsvg/fileutil.go

@@ -0,0 +1,22 @@
+package draw2dsvg
+
+import (
+	"encoding/xml"
+	_ "errors"
+	"os"
+)
+
+func SaveToSvgFile(filePath string, svg *Svg) error {
+	f, err := os.Create(filePath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	f.Write([]byte(xml.Header))
+	encoder := xml.NewEncoder(f)
+	encoder.Indent("", "\t")
+	err = encoder.Encode(svg)
+
+	return err
+}

draw2dsvg/gc.go

@@ -0,0 +1,403 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 16/12/2017 by Drahoslav Bednář
+
+package draw2dsvg
+
+import (
+	"image"
+	"log"
+	"math"
+	"strconv"
+	"strings"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dbase"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+type drawType int
+
+const (
+	filled drawType = 1 << iota
+	stroked
+)
+
+// GraphicContext implements the draw2d.GraphicContext interface
+// It provides draw2d with a svg backend
+type GraphicContext struct {
+	*draw2dbase.StackGraphicContext
+	FontCache  draw2d.FontCache
+	glyphCache draw2dbase.GlyphCache
+	glyphBuf   *truetype.GlyphBuf
+	svg        *Svg
+	DPI        int
+}
+
+func NewGraphicContext(svg *Svg) *GraphicContext {
+	gc := &GraphicContext{
+		draw2dbase.NewStackGraphicContext(),
+		draw2d.GetGlobalFontCache(),
+		draw2dbase.NewGlyphCache(),
+		&truetype.GlyphBuf{},
+		svg,
+		92,
+	}
+	return gc
+}
+
+// Clear fills the current canvas with a default transparent color
+func (gc *GraphicContext) Clear() {
+	gc.svg.Groups = nil
+}
+
+// Stroke strokes the paths with the color specified by SetStrokeColor
+func (gc *GraphicContext) Stroke(paths ...*draw2d.Path) {
+	gc.drawPaths(stroked, paths...)
+	gc.Current.Path.Clear()
+}
+
+// Fill fills the paths with the color specified by SetFillColor
+func (gc *GraphicContext) Fill(paths ...*draw2d.Path) {
+	gc.drawPaths(filled, paths...)
+	gc.Current.Path.Clear()
+}
+
+// FillStroke first fills the paths and than strokes them
+func (gc *GraphicContext) FillStroke(paths ...*draw2d.Path) {
+	gc.drawPaths(filled|stroked, paths...)
+	gc.Current.Path.Clear()
+}
+
+// FillString draws the text at point (0, 0)
+func (gc *GraphicContext) FillString(text string) (cursor float64) {
+	return gc.FillStringAt(text, 0, 0)
+}
+
+// FillStringAt draws the text at the specified point (x, y)
+func (gc *GraphicContext) FillStringAt(text string, x, y float64) (cursor float64) {
+	return gc.drawString(text, filled, x, y)
+}
+
+// StrokeString draws the contour of the text at point (0, 0)
+func (gc *GraphicContext) StrokeString(text string) (cursor float64) {
+	return gc.StrokeStringAt(text, 0, 0)
+}
+
+// StrokeStringAt draws the contour of the text at point (x, y)
+func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (cursor float64) {
+	return gc.drawString(text, stroked, x, y)
+}
+
+// Save the context and push it to the context stack
+func (gc *GraphicContext) Save() {
+	gc.StackGraphicContext.Save()
+	// TODO use common transformation group for multiple elements
+}
+
+// Restore remove the current context and restore the last one
+func (gc *GraphicContext) Restore() {
+	gc.StackGraphicContext.Restore()
+	// TODO use common transformation group for multiple elements
+}
+
+func (gc *GraphicContext) SetDPI(dpi int) {
+	gc.DPI = dpi
+	gc.recalc()
+}
+
+func (gc *GraphicContext) GetDPI() int {
+	return gc.DPI
+}
+
+// SetFont sets the font used to draw text.
+func (gc *GraphicContext) SetFont(font *truetype.Font) {
+	gc.Current.Font = font
+}
+
+// SetFontSize sets the font size in points (as in “a 12 point font”).
+func (gc *GraphicContext) SetFontSize(fontSize float64) {
+	gc.Current.FontSize = fontSize
+	gc.recalc()
+}
+
+// DrawImage draws the raster image in the current canvas
+func (gc *GraphicContext) DrawImage(image image.Image) {
+	bounds := image.Bounds()
+
+	svgImage := &Image{Href: imageToSvgHref(image)}
+	svgImage.X = float64(bounds.Min.X)
+	svgImage.Y = float64(bounds.Min.Y)
+	svgImage.Width = toSvgLength(float64(bounds.Max.X - bounds.Min.X))
+	svgImage.Height = toSvgLength(float64(bounds.Max.Y - bounds.Min.Y))
+	gc.newGroup(0).Image = svgImage
+}
+
+// ClearRect fills the specified rectangle with a default transparent color
+func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int) {
+	mask := gc.newMask(x1, y1, x2-x1, y2-y1)
+
+	newGroup := &Group{
+		Groups: gc.svg.Groups,
+		Mask:   "url(#" + mask.Id + ")",
+	}
+
+	// replace groups with new masked group
+	gc.svg.Groups = []*Group{newGroup}
+}
+
+// NOTE following  two functions and soe other further below copied from dwra2d{img|gl}
+// TODO move them all to common draw2dbase?
+
+// CreateStringPath creates a path from the string s at x, y, and returns the string width.
+// The text is placed so that the left edge of the em square of the first character of s
+// and the baseline intersect at x, y. The majority of the affected pixels will be
+// above and to the right of the point, but some may be below or to the left.
+// For example, drawing a string that starts with a 'J' in an italic font may
+// affect pixels below and left of the point.
+func (gc *GraphicContext) CreateStringPath(s string, x, y float64) (cursor float64) {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0.0
+	}
+	startx := x
+	prev, hasPrev := truetype.Index(0), false
+	for _, rune := range s {
+		index := f.Index(rune)
+		if hasPrev {
+			x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		err := gc.drawGlyph(index, x, y)
+		if err != nil {
+			log.Println(err)
+			return startx - x
+		}
+		x += fUnitsToFloat64(f.HMetric(fixed.Int26_6(gc.Current.Scale), index).AdvanceWidth)
+		prev, hasPrev = index, true
+	}
+
+	return x - startx
+}
+
+// GetStringBounds returns the approximate pixel bounds of the string s at x, y.
+// The the left edge of the em square of the first character of s
+// and the baseline intersect at 0, 0 in the returned coordinates.
+// Therefore the top and left coordinates may well be negative.
+func (gc *GraphicContext) GetStringBounds(s string) (left, top, right, bottom float64) {
+	f, err := gc.loadCurrentFont()
+	if err != nil {
+		log.Println(err)
+		return 0, 0, 0, 0
+	}
+	if gc.Current.Scale == 0 {
+		panic("zero scale")
+	}
+	top, left, bottom, right = 10e6, 10e6, -10e6, -10e6
+	cursor := 0.0
+	prev, hasPrev := truetype.Index(0), false
+	for _, rune := range s {
+		index := f.Index(rune)
+		if hasPrev {
+			cursor += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
+		}
+		if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), index, font.HintingNone); err != nil {
+			log.Println(err)
+			return 0, 0, 0, 0
+		}
+		e0 := 0
+		for _, e1 := range gc.glyphBuf.Ends {
+			ps := gc.glyphBuf.Points[e0:e1]
+			for _, p := range ps {
+				x, y := pointToF64Point(p)
+				top = math.Min(top, y)
+				bottom = math.Max(bottom, y)
+				left = math.Min(left, x+cursor)
+				right = math.Max(right, x+cursor)
+			}
+		}
+		cursor += fUnitsToFloat64(f.HMetric(fixed.Int26_6(gc.Current.Scale), index).AdvanceWidth)
+		prev, hasPrev = index, true
+	}
+	return left, top, right, bottom
+}
+
+////////////////////
+// private funcitons
+
+func (gc *GraphicContext) drawPaths(drawType drawType, paths ...*draw2d.Path) {
+	// create elements
+	svgPath := Path{}
+	group := gc.newGroup(drawType)
+
+	// set attrs to path element
+	paths = append(paths, gc.Current.Path)
+	svgPathsDesc := make([]string, len(paths))
+	// multiple pathes has to be joined to single svg path description
+	// because fill-rule wont work for whole group as excepted
+	for i, path := range paths {
+		svgPathsDesc[i] = toSvgPathDesc(path)
+	}
+	svgPath.Desc = strings.Join(svgPathsDesc, " ")
+
+	// attach to group
+	group.Paths = []*Path{&svgPath}
+}
+
+// Add text element to svg and returns its expected width
+func (gc *GraphicContext) drawString(text string, drawType drawType, x, y float64) float64 {
+	switch gc.svg.FontMode {
+	case PathFontMode:
+		w := gc.CreateStringPath(text, x, y)
+		gc.drawPaths(drawType)
+		gc.Current.Path.Clear()
+		return w
+	case SvgFontMode:
+		gc.embedSvgFont(text)
+	}
+
+	// create elements
+	svgText := Text{}
+	group := gc.newGroup(drawType)
+
+	// set attrs to text element
+	svgText.Text = text
+	svgText.FontSize = gc.Current.FontSize
+	svgText.X = x
+	svgText.Y = y
+	svgText.FontFamily = gc.Current.FontData.Name
+
+	// attach to group
+	group.Texts = []*Text{&svgText}
+	left, _, right, _ := gc.GetStringBounds(text)
+	return right - left
+}
+
+// Creates new group from current context
+// attach it to svg and return
+func (gc *GraphicContext) newGroup(drawType drawType) *Group {
+	group := Group{}
+	// set attrs to group
+	if drawType&stroked == stroked {
+		group.Stroke = toSvgRGBA(gc.Current.StrokeColor)
+		group.StrokeWidth = toSvgLength(gc.Current.LineWidth)
+		group.StrokeLinecap = gc.Current.Cap.String()
+		group.StrokeLinejoin = gc.Current.Join.String()
+		if len(gc.Current.Dash) > 0 {
+			group.StrokeDasharray = toSvgArray(gc.Current.Dash)
+			group.StrokeDashoffset = toSvgLength(gc.Current.DashOffset)
+		}
+	}
+
+	if drawType&filled == filled {
+		group.Fill = toSvgRGBA(gc.Current.FillColor)
+		group.FillRule = toSvgFillRule(gc.Current.FillRule)
+	}
+
+	group.Transform = toSvgTransform(gc.Current.Tr)
+
+	// attach
+	gc.svg.Groups = append(gc.svg.Groups, &group)
+
+	return &group
+}
+
+// creates new mask attached to svg
+func (gc *GraphicContext) newMask(x, y, width, height int) *Mask {
+	mask := &Mask{}
+	mask.X = float64(x)
+	mask.Y = float64(y)
+	mask.Width = toSvgLength(float64(width))
+	mask.Height = toSvgLength(float64(height))
+
+	// attach mask
+	gc.svg.Masks = append(gc.svg.Masks, mask)
+	mask.Id = "mask-" + strconv.Itoa(len(gc.svg.Masks))
+	return mask
+}
+
+// Embed svg font definition to svg tree itself
+// Or update existing if already exists for curent font data
+func (gc *GraphicContext) embedSvgFont(text string) *Font {
+	fontName := gc.Current.FontData.Name
+	gc.loadCurrentFont()
+
+	// find or create font Element
+	svgFont := (*Font)(nil)
+	for _, font := range gc.svg.Fonts {
+		if font.Name == fontName {
+			svgFont = font
+			break
+		}
+	}
+	if svgFont == nil {
+		// create new
+		svgFont = &Font{}
+		// and attach
+		gc.svg.Fonts = append(gc.svg.Fonts, svgFont)
+	}
+
+	// fill with glyphs
+
+	gc.Save()
+	defer gc.Restore()
+	gc.SetFontSize(2048)
+	defer gc.SetDPI(gc.GetDPI())
+	gc.SetDPI(92)
+filling:
+	for _, rune := range text {
+		for _, g := range svgFont.Glyphs {
+			if g.Rune == Rune(rune) {
+				continue filling
+			}
+		}
+		glyph := gc.glyphCache.Fetch(gc, gc.GetFontName(), rune)
+		// glyphCache.Load indirectly calls CreateStringPath for single rune string
+
+		glypPath := glyph.Path.VerticalFlip() // svg font glyphs have oposite y axe
+		svgFont.Glyphs = append(svgFont.Glyphs, &Glyph{
+			Rune:      Rune(rune),
+			Desc:      toSvgPathDesc(glypPath),
+			HorizAdvX: glyph.Width,
+		})
+	}
+
+	// set attrs
+	svgFont.Id = "font-" + strconv.Itoa(len(gc.svg.Fonts))
+	svgFont.Name = fontName
+
+	// TODO use css @font-face with id instead of this
+	svgFont.Face = &Face{Family: fontName, Units: 2048, HorizAdvX: 2048}
+	return svgFont
+}
+
+func (gc *GraphicContext) loadCurrentFont() (*truetype.Font, error) {
+	font, err := gc.FontCache.Load(gc.Current.FontData)
+	if err != nil {
+		font, err = gc.FontCache.Load(draw2dbase.DefaultFontData)
+	}
+	if font != nil {
+		gc.SetFont(font)
+		gc.SetFontSize(gc.Current.FontSize)
+	}
+	return font, err
+}
+
+func (gc *GraphicContext) drawGlyph(glyph truetype.Index, dx, dy float64) error {
+	if err := gc.glyphBuf.Load(gc.Current.Font, fixed.Int26_6(gc.Current.Scale), glyph, font.HintingNone); err != nil {
+		return err
+	}
+	e0 := 0
+	for _, e1 := range gc.glyphBuf.Ends {
+		DrawContour(gc, gc.glyphBuf.Points[e0:e1], dx, dy)
+		e0 = e1
+	}
+	return nil
+}
+
+// recalc recalculates scale and bounds values from the font size, screen
+// resolution and font metrics, and invalidates the glyph cache.
+func (gc *GraphicContext) recalc() {
+	gc.Current.Scale = gc.Current.FontSize * float64(gc.DPI) * (64.0 / 72.0)
+}

draw2dsvg/samples_test.go

@@ -0,0 +1,65 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 26/06/2015 by Stani Michiels
+// See also test_test.go
+
+package draw2dsvg_test
+
+import (
+	"testing"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/android"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/frameimage"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/geometry"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/gopher"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/gopher2"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/helloworld"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/line"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/linecapjoin"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/postscript"
+)
+
+func TestSampleAndroid(t *testing.T) {
+	test(t, android.Main)
+}
+
+// TODO: FillString: w (width) is incorrect
+func TestSampleGeometry(t *testing.T) {
+	// Set the global folder for searching fonts
+	// The pdf backend needs for every ttf file its corresponding
+	// json/.z file which is generated by gofpdf/makefont.
+	draw2d.SetFontFolder("../resource/font")
+	test(t, geometry.Main)
+}
+
+func TestSampleGopher(t *testing.T) {
+	test(t, gopher.Main)
+}
+
+func TestSampleGopher2(t *testing.T) {
+	test(t, gopher2.Main)
+}
+
+func TestSampleHelloWorld(t *testing.T) {
+	// Set the global folder for searching fonts
+	// The pdf backend needs for every ttf file its corresponding
+	// json/.z file which is generated by gofpdf/makefont.
+	draw2d.SetFontFolder("../resource/font")
+	test(t, helloworld.Main)
+}
+
+func TestSampleFrameImage(t *testing.T) {
+	test(t, frameimage.Main)
+}
+
+func TestSampleLine(t *testing.T) {
+	test(t, line.Main)
+}
+
+func TestSampleLineCap(t *testing.T) {
+	test(t, linecapjoin.Main)
+}
+
+func TestSamplePostscript(t *testing.T) {
+	test(t, postscript.Main)
+}

draw2dsvg/svg.go

@@ -0,0 +1,172 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 16/12/2017 by Drahoslav Bednář
+
+package draw2dsvg
+
+import (
+	"encoding/xml"
+)
+
+/* svg elements */
+
+type FontMode int
+
+// Modes of font handling in svg
+const (
+	// Does nothing special
+	// Makes sense only for common system fonts
+	SysFontMode FontMode = 1 << iota
+
+	// Links font files in css def
+	// Requires distribution of font files with outputed svg
+	LinkFontMode // TODO implement
+
+	// Embeds glyphs definition in svg file itself in svg font format
+	// Has poor browser support
+	SvgFontMode
+
+	// Embeds font definiton in svg file itself in woff format as part of css def
+	CssFontMode // TODO implement
+
+	// Converts texts to paths
+	PathFontMode
+)
+
+type Svg struct {
+	XMLName  xml.Name `xml:"svg"`
+	Xmlns    string   `xml:"xmlns,attr"`
+	Fonts    []*Font  `xml:"defs>font"`
+	Masks    []*Mask  `xml:"defs>mask"`
+	Groups   []*Group `xml:"g"`
+	FontMode FontMode `xml:"-"`
+	FillStroke
+}
+
+func NewSvg() *Svg {
+	return &Svg{
+		Xmlns:      "http://www.w3.org/2000/svg",
+		FillStroke: FillStroke{Fill: "none", Stroke: "none"},
+		FontMode:   PathFontMode,
+	}
+}
+
+type Group struct {
+	FillStroke
+	Transform string   `xml:"transform,attr,omitempty"`
+	Groups    []*Group `xml:"g"`
+	Paths     []*Path  `xml:"path"`
+	Texts     []*Text  `xml:"text"`
+	Image     *Image   `xml:"image"`
+	Mask      string   `xml:"mask,attr,omitempty"`
+}
+
+type Path struct {
+	FillStroke
+	Desc string `xml:"d,attr"`
+}
+
+type Text struct {
+	FillStroke
+	Position
+	FontSize   float64 `xml:"font-size,attr,omitempty"`
+	FontFamily string  `xml:"font-family,attr,omitempty"`
+	Text       string  `xml:",innerxml"`
+	Style      string  `xml:"style,attr,omitempty"`
+}
+
+type Image struct {
+	Position
+	Dimension
+	Href string `xml:"href,attr"`
+}
+
+type Mask struct {
+	Identity
+	Position
+	Dimension
+}
+
+type Rect struct {
+	Position
+	Dimension
+	FillStroke
+}
+
+func (m Mask) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	bigRect := Rect{}
+	bigRect.X, bigRect.Y = 0, 0
+	bigRect.Width, bigRect.Height = "100%", "100%"
+	bigRect.Fill = "#fff"
+	rect := Rect{}
+	rect.X, rect.Y = m.X, m.Y
+	rect.Width, rect.Height = m.Width, m.Height
+	rect.Fill = "#000"
+
+	return e.EncodeElement(struct {
+		XMLName xml.Name `xml:"mask"`
+		Rects   [2]Rect  `xml:"rect"`
+		Id      string   `xml:"id,attr"`
+	}{
+		Rects: [2]Rect{bigRect, rect},
+		Id:    m.Id,
+	}, start)
+}
+
+/* font related elements */
+
+type Font struct {
+	Identity
+	Face   *Face    `xml:"font-face"`
+	Glyphs []*Glyph `xml:"glyph"`
+}
+
+type Face struct {
+	Family    string  `xml:"font-family,attr"`
+	Units     int     `xml:"units-per-em,attr"`
+	HorizAdvX float64 `xml:"horiz-adv-x,attr"`
+	// TODO add other attrs, like style, variant, weight...
+}
+
+type Glyph struct {
+	Rune      Rune    `xml:"unicode,attr"`
+	Desc      string  `xml:"d,attr"`
+	HorizAdvX float64 `xml:"horiz-adv-x,attr"`
+}
+
+type Rune rune
+
+func (r Rune) MarshalXMLAttr(name xml.Name) (xml.Attr, error) {
+	return xml.Attr{
+		Name:  name,
+		Value: string(rune(r)),
+	}, nil
+}
+
+/* shared attrs */
+
+type Identity struct {
+	Id   string `xml:"id,attr"`
+	Name string `xml:"name,attr"`
+}
+
+type Position struct {
+	X float64 `xml:"x,attr,omitempty"`
+	Y float64 `xml:"y,attr,omitempty"`
+}
+
+type Dimension struct {
+	Width  string `xml:"width,attr"`
+	Height string `xml:"height,attr"`
+}
+
+type FillStroke struct {
+	Fill     string `xml:"fill,attr,omitempty"`
+	FillRule string `xml:"fill-rule,attr,omitempty"`
+
+	Stroke           string `xml:"stroke,attr,omitempty"`
+	StrokeWidth      string `xml:"stroke-width,attr,omitempty"`
+	StrokeLinecap    string `xml:"stroke-linecap,attr,omitempty"`
+	StrokeLinejoin   string `xml:"stroke-linejoin,attr,omitempty"`
+	StrokeDasharray  string `xml:"stroke-dasharray,attr,omitempty"`
+	StrokeDashoffset string `xml:"stroke-dashoffset,attr,omitempty"`
+}

draw2dsvg/test_test.go

@@ -0,0 +1,32 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 16/12/2017 by Drahoslav Bednář
+
+// Package draw2dsvg_test gives test coverage with the command:
+// go test -cover ./... | grep -v "no test"
+// (It should be run from its parent draw2d directory.)
+package draw2dsvg_test
+
+import (
+	"testing"
+
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dsvg"
+)
+
+type sample func(gc draw2d.GraphicContext, ext string) (string, error)
+
+func test(t *testing.T, draw sample) {
+	// Initialize the graphic context on an pdf document
+	dest := draw2dsvg.NewSvg()
+	gc := draw2dsvg.NewGraphicContext(dest)
+	// Draw sample
+	output, err := draw(gc, "svg")
+	if err != nil {
+		t.Errorf("Drawing %q failed: %v", output, err)
+		return
+	}
+	err = draw2dsvg.SaveToSvgFile(output, dest)
+	if err != nil {
+		t.Errorf("Saving %q failed: %v", output, err)
+	}
+}

draw2dsvg/text.go

@@ -0,0 +1,83 @@
+// NOTE that this is identical copy of draw2dgl/text.go and draw2dimg/text.go
+package draw2dsvg
+
+import (
+	"git.fromouter.space/crunchy-rocks/draw2d"
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
+	"golang.org/x/image/math/fixed"
+)
+
+// DrawContour draws the given closed contour at the given sub-pixel offset.
+func DrawContour(path draw2d.PathBuilder, ps []truetype.Point, dx, dy float64) {
+	if len(ps) == 0 {
+		return
+	}
+	startX, startY := pointToF64Point(ps[0])
+
+	path.MoveTo(startX+dx, startY+dy)
+	q0X, q0Y, on0 := startX, startY, true
+	for _, p := range ps[1:] {
+		qX, qY := pointToF64Point(p)
+		on := p.Flags&0x01 != 0
+		if on {
+			if on0 {
+				path.LineTo(qX+dx, qY+dy)
+			} else {
+				path.QuadCurveTo(q0X+dx, q0Y+dy, qX+dx, qY+dy)
+			}
+		} else {
+			if on0 {
+				// No-op.
+			} else {
+				midX := (q0X + qX) / 2
+				midY := (q0Y + qY) / 2
+				path.QuadCurveTo(q0X+dx, q0Y+dy, midX+dx, midY+dy)
+			}
+		}
+		q0X, q0Y, on0 = qX, qY, on
+	}
+	// Close the curve.
+	if on0 {
+		path.LineTo(startX+dx, startY+dy)
+	} else {
+		path.QuadCurveTo(q0X+dx, q0Y+dy, startX+dx, startY+dy)
+	}
+}
+
+func pointToF64Point(p truetype.Point) (x, y float64) {
+	return fUnitsToFloat64(p.X), -fUnitsToFloat64(p.Y)
+}
+
+func fUnitsToFloat64(x fixed.Int26_6) float64 {
+	scaled := x << 2
+	return float64(scaled/256) + float64(scaled%256)/256.0
+}
+
+// FontExtents contains font metric information.
+type FontExtents struct {
+	// Ascent is the distance that the text
+	// extends above the baseline.
+	Ascent float64
+
+	// Descent is the distance that the text
+	// extends below the baseline.  The descent
+	// is given as a negative value.
+	Descent float64
+
+	// Height is the distance from the lowest
+	// descending point to the highest ascending
+	// point.
+	Height float64
+}
+
+// Extents returns the FontExtents for a font.
+// TODO needs to read this https://developer.apple.com/fonts/TrueType-Reference-Manual/RM02/Chap2.html#intro
+func Extents(font *truetype.Font, size float64) FontExtents {
+	bounds := font.Bounds(fixed.Int26_6(font.FUnitsPerEm()))
+	scale := size / float64(font.FUnitsPerEm())
+	return FontExtents{
+		Ascent:  float64(bounds.Max.Y) * scale,
+		Descent: float64(bounds.Min.Y) * scale,
+		Height:  float64(bounds.Max.Y-bounds.Min.Y) * scale,
+	}
+}

draw2dsvg/xml_test.go

@@ -0,0 +1,58 @@
+// Copyright 2015 The draw2d Authors. All rights reserved.
+// created: 16/12/2017 by Drahoslav Bednář
+
+// Package draw2dsvg_test gives test coverage with the command:
+// go test -cover ./... | grep -v "no test"
+// (It should be run from its parent draw2d directory.)
+package draw2dsvg
+
+import (
+	"encoding/xml"
+	"testing"
+)
+
+// Test basic encoding of svg/xml elements
+func TestXml(t *testing.T) {
+
+	svg := NewSvg()
+	svg.Groups = []*Group{&Group{
+		Groups: []*Group{
+			&Group{}, // nested groups
+			&Group{},
+		},
+		Texts: []*Text{
+			&Text{Text: "Hello"},                        // text
+			&Text{Text: "world", Style: "opacity: 0.5"}, // text with style
+		},
+		Paths: []*Path{
+			&Path{Desc: "M100,200 C100,100 250,100 250,200 S400,300 400,200"}, // simple path
+			&Path{}, // empty path
+		},
+	}}
+
+	expectedOut := `<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="none">
+  <defs></defs>
+  <g>
+    <g></g>
+    <g></g>
+    <path d="M100,200 C100,100 250,100 250,200 S400,300 400,200"></path>
+    <path d=""></path>
+    <text>Hello</text>
+    <text style="opacity: 0.5">world</text>
+  </g>
+</svg>`
+
+	out, err := xml.MarshalIndent(svg, "", "  ")
+
+	if err != nil {
+		t.Error(err)
+	}
+	if string(out) != expectedOut {
+		t.Errorf("svg output is not as expected\n"+
+			"got:\n%s\n\n"+
+			"want:\n%s\n",
+			string(out),
+			expectedOut,
+		)
+	}
+}

font.go

@@ -6,18 +6,16 @@ package draw2d
 import (
 	"io/ioutil"
 	"log"
-	"path"
 	"path/filepath"
 
-	"code.google.com/p/freetype-go/freetype/truetype"
+	"sync"
-)
+
-
+	"git.fromouter.space/crunchy-rocks/freetype/truetype"
-var (
-	fontFolder               = "../resource/font/"
-	fonts                    = make(map[string]*truetype.Font)
-	fontNamer  FontFileNamer = FontFileName
 )
 
+// FontStyle defines bold and italic styles for the font
+// It is possible to combine values for mixed styles, eg.
+//     FontData.Style = FontStyleBold | FontStyleItalic
 type FontStyle byte
 
 const (
@@ -66,41 +64,167 @@ func FontFileName(fontData FontData) string {
 }
 
 func RegisterFont(fontData FontData, font *truetype.Font) {
-	fonts[fontNamer(fontData)] = font
+	fontCache.Store(fontData, font)
 }
 
-func GetFont(fontData FontData) *truetype.Font {
+func GetFont(fontData FontData) (font *truetype.Font) {
-	fontFileName := fontNamer(fontData)
+	var err error
-	font := fonts[fontFileName]
+
-	if font != nil {
+	if font, err = fontCache.Load(fontData); err != nil {
-		return font
+		log.Println(err)
 	}
-	fonts[fontFileName] = loadFont(fontFileName)
+
-	return fonts[fontFileName]
+	return
 }
 
 func GetFontFolder() string {
-	return fontFolder
+	return defaultFonts.folder
 }
 
 func SetFontFolder(folder string) {
-	fontFolder = filepath.Clean(folder)
+	defaultFonts.setFolder(filepath.Clean(folder))
+}
+
+func GetGlobalFontCache() FontCache {
+	return fontCache
 }
 
 func SetFontNamer(fn FontFileNamer) {
-	fontNamer = fn
+	defaultFonts.setNamer(fn)
 }
 
-func loadFont(fontFileName string) *truetype.Font {
+// Types implementing this interface can be passed to SetFontCache to change the
-	fontBytes, err := ioutil.ReadFile(path.Join(fontFolder, fontFileName))
+// way fonts are being stored and retrieved.
-	if err != nil {
+type FontCache interface {
-		log.Println(err)
+	// Loads a truetype font represented by the FontData object passed as
-		return nil
+	// argument.
-	}
+	// The method returns an error if the font could not be loaded, either
-	font, err := truetype.Parse(fontBytes)
+	// because it didn't exist or the resource it was loaded from was corrupted.
-	if err != nil {
+	Load(FontData) (*truetype.Font, error)
-		log.Println(err)
+
-		return nil
+	// Sets the truetype font that will be returned by Load when given the font
-	}
+	// data passed as first argument.
-	return font
+	Store(FontData, *truetype.Font)
 }
+
+// Changes the font cache backend used by the package. After calling this
+// functionSetFontFolder and SetFontNamer will not affect anymore how fonts are
+// loaded.
+// To restore the default font cache, call this function passing nil as argument.
+func SetFontCache(cache FontCache) {
+	if cache == nil {
+		fontCache = defaultFonts
+	} else {
+		fontCache = cache
+	}
+}
+
+// FolderFontCache can Load font from folder
+type FolderFontCache struct {
+	fonts  map[string]*truetype.Font
+	folder string
+	namer  FontFileNamer
+}
+
+// NewFolderFontCache creates FolderFontCache
+func NewFolderFontCache(folder string) *FolderFontCache {
+	return &FolderFontCache{
+		fonts:  make(map[string]*truetype.Font),
+		folder: folder,
+		namer:  FontFileName,
+	}
+}
+
+// Load a font from cache if exists otherwise it will load the font from file
+func (cache *FolderFontCache) Load(fontData FontData) (font *truetype.Font, err error) {
+	if font = cache.fonts[cache.namer(fontData)]; font != nil {
+		return font, nil
+	}
+
+	var data []byte
+	var file = cache.namer(fontData)
+
+	if data, err = ioutil.ReadFile(filepath.Join(cache.folder, file)); err != nil {
+		return
+	}
+
+	if font, err = truetype.Parse(data); err != nil {
+		return
+	}
+
+	cache.fonts[file] = font
+	return
+}
+
+// Store a font to this cache
+func (cache *FolderFontCache) Store(fontData FontData, font *truetype.Font) {
+	cache.fonts[cache.namer(fontData)] = font
+}
+
+// SyncFolderFontCache can Load font from folder
+type SyncFolderFontCache struct {
+	sync.RWMutex
+	fonts  map[string]*truetype.Font
+	folder string
+	namer  FontFileNamer
+}
+
+// NewSyncFolderFontCache creates SyncFolderFontCache
+func NewSyncFolderFontCache(folder string) *SyncFolderFontCache {
+	return &SyncFolderFontCache{
+		fonts:  make(map[string]*truetype.Font),
+		folder: folder,
+		namer:  FontFileName,
+	}
+}
+
+func (cache *SyncFolderFontCache) setFolder(folder string) {
+	cache.Lock()
+	cache.folder = folder
+	cache.Unlock()
+}
+
+func (cache *SyncFolderFontCache) setNamer(namer FontFileNamer) {
+	cache.Lock()
+	cache.namer = namer
+	cache.Unlock()
+}
+
+// Load a font from cache if exists otherwise it will load the font from file
+func (cache *SyncFolderFontCache) Load(fontData FontData) (font *truetype.Font, err error) {
+	cache.RLock()
+	font = cache.fonts[cache.namer(fontData)]
+	cache.RUnlock()
+
+	if font != nil {
+		return font, nil
+	}
+
+	var data []byte
+	var file = cache.namer(fontData)
+
+	if data, err = ioutil.ReadFile(filepath.Join(cache.folder, file)); err != nil {
+		return
+	}
+
+	if font, err = truetype.Parse(data); err != nil {
+		return
+	}
+	cache.Lock()
+	cache.fonts[file] = font
+	cache.Unlock()
+	return
+}
+
+// Store a font to this cache
+func (cache *SyncFolderFontCache) Store(fontData FontData, font *truetype.Font) {
+	cache.Lock()
+	cache.fonts[cache.namer(fontData)] = font
+	cache.Unlock()
+}
+
+var (
+	defaultFonts = NewSyncFolderFontCache("../resource/font")
+
+	fontCache FontCache = defaultFonts
+)

gc.go

@@ -8,52 +8,80 @@ import (
 	"image/color"
 )
 
-// FillRule defines the type for fill rules
-type FillRule int
-
-const (
-	// FillRuleEvenOdd defines the even odd filling rule
-	FillRuleEvenOdd FillRule = iota
-	// FillRuleWinding defines the non zero winding rule
-	FillRuleWinding
-)
-
 // GraphicContext describes the interface for the various backends (images, pdf, opengl, ...)
 type GraphicContext interface {
-	Path
+	// PathBuilder describes the interface for path drawing
-	// Create a new path
+	PathBuilder
+	// BeginPath creates a new path
 	BeginPath()
-	GetMatrixTransform() MatrixTransform
+	// GetPath copies the current path, then returns it
-	SetMatrixTransform(tr MatrixTransform)
+	GetPath() Path
-	ComposeMatrixTransform(tr MatrixTransform)
+	// GetMatrixTransform returns the current transformation matrix
+	GetMatrixTransform() Matrix
+	// SetMatrixTransform sets the current transformation matrix
+	SetMatrixTransform(tr Matrix)
+	// ComposeMatrixTransform composes the current transformation matrix with tr
+	ComposeMatrixTransform(tr Matrix)
+	// Rotate applies a rotation to the current transformation matrix. angle is in radian.
 	Rotate(angle float64)
+	// Translate applies a translation to the current transformation matrix.
 	Translate(tx, ty float64)
+	// Scale applies a scale to the current transformation matrix.
 	Scale(sx, sy float64)
+	// SetStrokeColor sets the current stroke color
 	SetStrokeColor(c color.Color)
+	// SetFillColor sets the current fill color
 	SetFillColor(c color.Color)
+	// SetFillRule sets the current fill rule
 	SetFillRule(f FillRule)
+	// SetLineWidth sets the current line width
 	SetLineWidth(lineWidth float64)
-	SetLineCap(cap Cap)
+	// SetLineCap sets the current line cap
-	SetLineJoin(join Join)
+	SetLineCap(cap LineCap)
+	// SetLineJoin sets the current line join
+	SetLineJoin(join LineJoin)
+	// SetLineDash sets the current dash
 	SetLineDash(dash []float64, dashOffset float64)
+	// SetFontSize sets the current font size
 	SetFontSize(fontSize float64)
+	// GetFontSize gets the current font size
 	GetFontSize() float64
+	// SetFontData sets the current FontData
 	SetFontData(fontData FontData)
+	// GetFontData gets the current FontData
 	GetFontData() FontData
+	// GetFontName gets the current FontData as a string
+	GetFontName() string
+	// DrawImage draws the raster image in the current canvas
 	DrawImage(image image.Image)
+	// Save the context and push it to the context stack
 	Save()
+	// Restore remove the current context and restore the last one
 	Restore()
+	// Clear fills the current canvas with a default transparent color
 	Clear()
+	// ClearRect fills the specified rectangle with a default transparent color
 	ClearRect(x1, y1, x2, y2 int)
+	// SetDPI sets the current DPI
 	SetDPI(dpi int)
+	// GetDPI gets the current DPI
 	GetDPI() int
+	// GetStringBounds gets pixel bounds(dimensions) of given string
 	GetStringBounds(s string) (left, top, right, bottom float64)
+	// CreateStringPath creates a path from the string s at x, y
 	CreateStringPath(text string, x, y float64) (cursor float64)
+	// FillString draws the text at point (0, 0)
 	FillString(text string) (cursor float64)
+	// FillStringAt draws the text at the specified point (x, y)
 	FillStringAt(text string, x, y float64) (cursor float64)
+	// StrokeString draws the contour of the text at point (0, 0)
 	StrokeString(text string) (cursor float64)
+	// StrokeStringAt draws the contour of the text at point (x, y)
 	StrokeStringAt(text string, x, y float64) (cursor float64)
-	Stroke(paths ...*PathStorage)
+	// Stroke strokes the paths with the color specified by SetStrokeColor
-	Fill(paths ...*PathStorage)
+	Stroke(paths ...*Path)
-	FillStroke(paths ...*PathStorage)
+	// Fill fills the paths with the color specified by SetFillColor
+	Fill(paths ...*Path)
+	// FillStroke first fills the paths and than strokes them
+	FillStroke(paths ...*Path)
 }

go.mod

@@ -0,0 +1,13 @@
+module git.fromouter.space/crunchy-rocks/draw2d
+
+require (
+	git.fromouter.space/crunchy-rocks/emoji v0.0.0-20181116142102-2188aadaf093
+	git.fromouter.space/crunchy-rocks/freetype v0.0.0-20181116104610-3115318f2577
+	github.com/go-gl/gl v0.0.0-20180407155706-68e253793080
+	github.com/go-gl/glfw v0.0.0-20180426074136-46a8d530c326
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	github.com/jung-kurt/gofpdf v1.0.0
+	github.com/llgcode/draw2d v0.0.0-20180825133448-f52c8a71aff0
+	github.com/llgcode/ps v0.0.0-20150911083025-f1443b32eedb
+	golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81
+)

image.go

@@ -1,358 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"errors"
-	"image"
-	"image/color"
-	"image/draw"
-	"log"
-	"math"
-
-	"code.google.com/p/freetype-go/freetype/raster"
-	"code.google.com/p/freetype-go/freetype/truetype"
-)
-
-type Painter interface {
-	raster.Painter
-	SetColor(color color.Color)
-}
-
-var (
-	defaultFontData = FontData{"luxi", FontFamilySans, FontStyleNormal}
-)
-
-type ImageGraphicContext struct {
-	*StackGraphicContext
-	img              draw.Image
-	painter          Painter
-	fillRasterizer   *raster.Rasterizer
-	strokeRasterizer *raster.Rasterizer
-	glyphBuf         *truetype.GlyphBuf
-	DPI              int
-}
-
-// NewGraphicContext creates a new Graphic context from an image.
-func NewGraphicContext(img draw.Image) *ImageGraphicContext {
-	var painter Painter
-	switch selectImage := img.(type) {
-	case *image.RGBA:
-		painter = raster.NewRGBAPainter(selectImage)
-	default:
-		panic("Image type not supported")
-	}
-	return NewGraphicContextWithPainter(img, painter)
-}
-
-// NewGraphicContextWithPainter creates a new Graphic context from an image and a Painter (see Freetype-go)
-func NewGraphicContextWithPainter(img draw.Image, painter Painter) *ImageGraphicContext {
-	width, height := img.Bounds().Dx(), img.Bounds().Dy()
-	dpi := 92
-	gc := &ImageGraphicContext{
-		NewStackGraphicContext(),
-		img,
-		painter,
-		raster.NewRasterizer(width, height),
-		raster.NewRasterizer(width, height),
-		truetype.NewGlyphBuf(),
-		dpi,
-	}
-	return gc
-}
-
-func (gc *ImageGraphicContext) GetDPI() int {
-	return gc.DPI
-}
-
-func (gc *ImageGraphicContext) Clear() {
-	width, height := gc.img.Bounds().Dx(), gc.img.Bounds().Dy()
-	gc.ClearRect(0, 0, width, height)
-}
-
-func (gc *ImageGraphicContext) ClearRect(x1, y1, x2, y2 int) {
-	imageColor := image.NewUniform(gc.Current.FillColor)
-	draw.Draw(gc.img, image.Rect(x1, y1, x2, y2), imageColor, image.ZP, draw.Over)
-}
-
-func (gc *ImageGraphicContext) DrawImage(img image.Image) {
-	DrawImage(img, gc.img, gc.Current.Tr, draw.Over, BilinearFilter)
-}
-
-func (gc *ImageGraphicContext) FillString(text string) (cursor float64) {
-	return gc.FillStringAt(text, 0, 0)
-}
-
-func (gc *ImageGraphicContext) FillStringAt(text string, x, y float64) (cursor float64) {
-	width := gc.CreateStringPath(text, x, y)
-	gc.Fill()
-	return width
-}
-
-func (gc *ImageGraphicContext) StrokeString(text string) (cursor float64) {
-	return gc.StrokeStringAt(text, 0, 0)
-}
-
-func (gc *ImageGraphicContext) StrokeStringAt(text string, x, y float64) (cursor float64) {
-	width := gc.CreateStringPath(text, x, y)
-	gc.Stroke()
-	return width
-}
-
-func (gc *ImageGraphicContext) loadCurrentFont() (*truetype.Font, error) {
-	font := GetFont(gc.Current.FontData)
-	if font == nil {
-		font = GetFont(defaultFontData)
-	}
-	if font == nil {
-		return nil, errors.New("No font set, and no default font available.")
-	}
-	gc.SetFont(font)
-	gc.SetFontSize(gc.Current.FontSize)
-	return font, nil
-}
-
-func fUnitsToFloat64(x int32) float64 {
-	scaled := x << 2
-	return float64(scaled/256) + float64(scaled%256)/256.0
-}
-
-// p is a truetype.Point measured in FUnits and positive Y going upwards.
-// The returned value is the same thing measured in floating point and positive Y
-// going downwards.
-func pointToF64Point(p truetype.Point) (x, y float64) {
-	return fUnitsToFloat64(p.X), -fUnitsToFloat64(p.Y)
-}
-
-// drawContour draws the given closed contour at the given sub-pixel offset.
-func (gc *ImageGraphicContext) drawContour(ps []truetype.Point, dx, dy float64) {
-	if len(ps) == 0 {
-		return
-	}
-	startX, startY := pointToF64Point(ps[0])
-	gc.MoveTo(startX+dx, startY+dy)
-	q0X, q0Y, on0 := startX, startY, true
-	for _, p := range ps[1:] {
-		qX, qY := pointToF64Point(p)
-		on := p.Flags&0x01 != 0
-		if on {
-			if on0 {
-				gc.LineTo(qX+dx, qY+dy)
-			} else {
-				gc.QuadCurveTo(q0X+dx, q0Y+dy, qX+dx, qY+dy)
-			}
-		} else {
-			if on0 {
-				// No-op.
-			} else {
-				midX := (q0X + qX) / 2
-				midY := (q0Y + qY) / 2
-				gc.QuadCurveTo(q0X+dx, q0Y+dy, midX+dx, midY+dy)
-			}
-		}
-		q0X, q0Y, on0 = qX, qY, on
-	}
-	// Close the curve.
-	if on0 {
-		gc.LineTo(startX+dx, startY+dy)
-	} else {
-		gc.QuadCurveTo(q0X+dx, q0Y+dy, startX+dx, startY+dy)
-	}
-}
-
-func (gc *ImageGraphicContext) drawGlyph(glyph truetype.Index, dx, dy float64) error {
-	if err := gc.glyphBuf.Load(gc.Current.Font, int32(gc.Current.Scale), glyph, truetype.NoHinting); err != nil {
-		return err
-	}
-	e0 := 0
-	for _, e1 := range gc.glyphBuf.End {
-		gc.drawContour(gc.glyphBuf.Point[e0:e1], dx, dy)
-		e0 = e1
-	}
-	return nil
-}
-
-// CreateStringPath creates a path from the string s at x, y, and returns the string width.
-// The text is placed so that the left edge of the em square of the first character of s
-// and the baseline intersect at x, y. The majority of the affected pixels will be
-// above and to the right of the point, but some may be below or to the left.
-// For example, drawing a string that starts with a 'J' in an italic font may
-// affect pixels below and left of the point.
-func (gc *ImageGraphicContext) CreateStringPath(s string, x, y float64) float64 {
-	font, err := gc.loadCurrentFont()
-	if err != nil {
-		log.Println(err)
-		return 0.0
-	}
-	startx := x
-	prev, hasPrev := truetype.Index(0), false
-	for _, rune := range s {
-		index := font.Index(rune)
-		if hasPrev {
-			x += fUnitsToFloat64(font.Kerning(int32(gc.Current.Scale), prev, index))
-		}
-		err := gc.drawGlyph(index, x, y)
-		if err != nil {
-			log.Println(err)
-			return startx - x
-		}
-		x += fUnitsToFloat64(font.HMetric(int32(gc.Current.Scale), index).AdvanceWidth)
-		prev, hasPrev = index, true
-	}
-	return x - startx
-}
-
-// GetStringBounds returns the approximate pixel bounds of the string s at x, y.
-// The left edge of the em square of the first character of s
-// and the baseline intersect at 0, 0 in the returned coordinates.
-// Therefore the top and left coordinates may well be negative.
-func (gc *ImageGraphicContext) GetStringBounds(s string) (left, top, right, bottom float64) {
-	font, err := gc.loadCurrentFont()
-	if err != nil {
-		log.Println(err)
-		return 0, 0, 0, 0
-	}
-	top, left, bottom, right = 10e6, 10e6, -10e6, -10e6
-	cursor := 0.0
-	prev, hasPrev := truetype.Index(0), false
-	for _, rune := range s {
-		index := font.Index(rune)
-		if hasPrev {
-			cursor += fUnitsToFloat64(font.Kerning(int32(gc.Current.Scale), prev, index))
-		}
-		if err := gc.glyphBuf.Load(gc.Current.Font, int32(gc.Current.Scale), index, truetype.NoHinting); err != nil {
-			log.Println(err)
-			return 0, 0, 0, 0
-		}
-		e0 := 0
-		for _, e1 := range gc.glyphBuf.End {
-			ps := gc.glyphBuf.Point[e0:e1]
-			for _, p := range ps {
-				x, y := pointToF64Point(p)
-				top = math.Min(top, y)
-				bottom = math.Max(bottom, y)
-				left = math.Min(left, x+cursor)
-				right = math.Max(right, x+cursor)
-			}
-		}
-		cursor += fUnitsToFloat64(font.HMetric(int32(gc.Current.Scale), index).AdvanceWidth)
-		prev, hasPrev = index, true
-	}
-	return left, top, right, bottom
-}
-
-// recalc recalculates scale and bounds values from the font size, screen
-// resolution and font metrics, and invalidates the glyph cache.
-func (gc *ImageGraphicContext) recalc() {
-	gc.Current.Scale = gc.Current.FontSize * float64(gc.DPI) * (64.0 / 72.0)
-}
-
-// SetDPI sets the screen resolution in dots per inch.
-func (gc *ImageGraphicContext) SetDPI(dpi int) {
-	gc.DPI = dpi
-	gc.recalc()
-}
-
-// SetFont sets the font used to draw text.
-func (gc *ImageGraphicContext) SetFont(font *truetype.Font) {
-	gc.Current.Font = font
-}
-
-// SetFontSize sets the font size in points (as in ``a 12 point font'').
-func (gc *ImageGraphicContext) SetFontSize(fontSize float64) {
-	gc.Current.FontSize = fontSize
-	gc.recalc()
-}
-
-func (gc *ImageGraphicContext) paint(rasterizer *raster.Rasterizer, color color.Color) {
-	gc.painter.SetColor(color)
-	rasterizer.Rasterize(gc.painter)
-	rasterizer.Clear()
-	gc.Current.Path = NewPathStorage()
-}
-
-// Stroke strokes the paths with the color specified by SetStrokeColor
-func (gc *ImageGraphicContext) Stroke(paths ...*PathStorage) {
-	paths = append(paths, gc.Current.Path)
-	gc.strokeRasterizer.UseNonZeroWinding = true
-
-	stroker := NewLineStroker(gc.Current.Cap, gc.Current.Join, NewVertexMatrixTransform(gc.Current.Tr, NewVertexAdder(gc.strokeRasterizer)))
-	stroker.HalfLineWidth = gc.Current.LineWidth / 2
-	var pathConverter *PathConverter
-	if gc.Current.Dash != nil && len(gc.Current.Dash) > 0 {
-		dasher := NewDashConverter(gc.Current.Dash, gc.Current.DashOffset, stroker)
-		pathConverter = NewPathConverter(dasher)
-	} else {
-		pathConverter = NewPathConverter(stroker)
-	}
-	pathConverter.ApproximationScale = gc.Current.Tr.GetScale()
-	pathConverter.Convert(paths...)
-
-	gc.paint(gc.strokeRasterizer, gc.Current.StrokeColor)
-}
-
-// Fill fills the paths with the color specified by SetFillColor
-func (gc *ImageGraphicContext) Fill(paths ...*PathStorage) {
-	paths = append(paths, gc.Current.Path)
-	gc.fillRasterizer.UseNonZeroWinding = gc.Current.FillRule.UseNonZeroWinding()
-
-	/**** first method ****/
-	pathConverter := NewPathConverter(NewVertexMatrixTransform(gc.Current.Tr, NewVertexAdder(gc.fillRasterizer)))
-	pathConverter.ApproximationScale = gc.Current.Tr.GetScale()
-	pathConverter.Convert(paths...)
-
-	gc.paint(gc.fillRasterizer, gc.Current.FillColor)
-}
-
-// FillStroke first fills the paths and than strokes them
-func (gc *ImageGraphicContext) FillStroke(paths ...*PathStorage) {
-	gc.fillRasterizer.UseNonZeroWinding = gc.Current.FillRule.UseNonZeroWinding()
-	gc.strokeRasterizer.UseNonZeroWinding = true
-
-	filler := NewVertexMatrixTransform(gc.Current.Tr, NewVertexAdder(gc.fillRasterizer))
-
-	stroker := NewLineStroker(gc.Current.Cap, gc.Current.Join, NewVertexMatrixTransform(gc.Current.Tr, NewVertexAdder(gc.strokeRasterizer)))
-	stroker.HalfLineWidth = gc.Current.LineWidth / 2
-
-	demux := NewDemuxConverter(filler, stroker)
-	paths = append(paths, gc.Current.Path)
-	pathConverter := NewPathConverter(demux)
-	pathConverter.ApproximationScale = gc.Current.Tr.GetScale()
-	pathConverter.Convert(paths...)
-
-	gc.paint(gc.fillRasterizer, gc.Current.FillColor)
-	gc.paint(gc.strokeRasterizer, gc.Current.StrokeColor)
-}
-
-func (f FillRule) UseNonZeroWinding() bool {
-	switch f {
-	case FillRuleEvenOdd:
-		return false
-	case FillRuleWinding:
-		return true
-	}
-	return false
-}
-
-func (c Cap) Convert() raster.Capper {
-	switch c {
-	case RoundCap:
-		return raster.RoundCapper
-	case ButtCap:
-		return raster.ButtCapper
-	case SquareCap:
-		return raster.SquareCapper
-	}
-	return raster.RoundCapper
-}
-
-func (j Join) Convert() raster.Joiner {
-	switch j {
-	case RoundJoin:
-		return raster.RoundJoiner
-	case BevelJoin:
-		return raster.BevelJoiner
-	}
-	return raster.RoundJoiner
-}

math.go

@@ -1,52 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"math"
-)
-
-func distance(x1, y1, x2, y2 float64) float64 {
-	dx := x2 - x1
-	dy := y2 - y1
-	return float64(math.Sqrt(dx*dx + dy*dy))
-}
-
-func vectorDistance(dx, dy float64) float64 {
-	return float64(math.Sqrt(dx*dx + dy*dy))
-}
-
-func squareDistance(x1, y1, x2, y2 float64) float64 {
-	dx := x2 - x1
-	dy := y2 - y1
-	return dx*dx + dy*dy
-}
-
-func min(x, y float64) float64 {
-	if x < y {
-		return x
-	}
-	return y
-}
-
-func max(x, y float64) float64 {
-	if x > y {
-		return x
-	}
-	return y
-}
-
-func minMax(x, y float64) (min, max float64) {
-	if x > y {
-		return y, x
-	}
-	return x, y
-}
-
-func minUint32(a, b uint32) uint32 {
-	if a < b {
-		return a
-	}
-	return b
-}

matrix.go

@@ -0,0 +1,222 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 21/11/2010 by Laurent Le Goff
+
+package draw2d
+
+import (
+	"math"
+)
+
+// Matrix represents an affine transformation
+type Matrix [6]float64
+
+const (
+	epsilon = 1e-6
+)
+
+// Determinant compute the determinant of the matrix
+func (tr Matrix) Determinant() float64 {
+	return tr[0]*tr[3] - tr[1]*tr[2]
+}
+
+// Transform applies the transformation matrix to points. It modify the points passed in parameter.
+func (tr Matrix) Transform(points []float64) {
+	for i, j := 0, 1; j < len(points); i, j = i+2, j+2 {
+		x := points[i]
+		y := points[j]
+		points[i] = x*tr[0] + y*tr[2] + tr[4]
+		points[j] = x*tr[1] + y*tr[3] + tr[5]
+	}
+}
+
+// TransformPoint applies the transformation matrix to point. It returns the point the transformed point.
+func (tr Matrix) TransformPoint(x, y float64) (xres, yres float64) {
+	xres = x*tr[0] + y*tr[2] + tr[4]
+	yres = x*tr[1] + y*tr[3] + tr[5]
+	return xres, yres
+}
+
+func minMax(x, y float64) (min, max float64) {
+	if x > y {
+		return y, x
+	}
+	return x, y
+}
+
+// Transform applies the transformation matrix to the rectangle represented by the min and the max point of the rectangle
+func (tr Matrix) TransformRectangle(x0, y0, x2, y2 float64) (nx0, ny0, nx2, ny2 float64) {
+	points := []float64{x0, y0, x2, y0, x2, y2, x0, y2}
+	tr.Transform(points)
+	points[0], points[2] = minMax(points[0], points[2])
+	points[4], points[6] = minMax(points[4], points[6])
+	points[1], points[3] = minMax(points[1], points[3])
+	points[5], points[7] = minMax(points[5], points[7])
+
+	nx0 = math.Min(points[0], points[4])
+	ny0 = math.Min(points[1], points[5])
+	nx2 = math.Max(points[2], points[6])
+	ny2 = math.Max(points[3], points[7])
+	return nx0, ny0, nx2, ny2
+}
+
+// InverseTransform applies the transformation inverse matrix to the rectangle represented by the min and the max point of the rectangle
+func (tr Matrix) InverseTransform(points []float64) {
+	d := tr.Determinant() // matrix determinant
+	for i, j := 0, 1; j < len(points); i, j = i+2, j+2 {
+		x := points[i]
+		y := points[j]
+		points[i] = ((x-tr[4])*tr[3] - (y-tr[5])*tr[2]) / d
+		points[j] = ((y-tr[5])*tr[0] - (x-tr[4])*tr[1]) / d
+	}
+}
+
+// InverseTransformPoint applies the transformation inverse matrix to point. It returns the point the transformed point.
+func (tr Matrix) InverseTransformPoint(x, y float64) (xres, yres float64) {
+	d := tr.Determinant() // matrix determinant
+	xres = ((x-tr[4])*tr[3] - (y-tr[5])*tr[2]) / d
+	yres = ((y-tr[5])*tr[0] - (x-tr[4])*tr[1]) / d
+	return xres, yres
+}
+
+// VectorTransform applies the transformation matrix to points without using the translation parameter of the affine matrix.
+// It modify the points passed in parameter.
+func (tr Matrix) VectorTransform(points []float64) {
+	for i, j := 0, 1; j < len(points); i, j = i+2, j+2 {
+		x := points[i]
+		y := points[j]
+		points[i] = x*tr[0] + y*tr[2]
+		points[j] = x*tr[1] + y*tr[3]
+	}
+}
+
+// NewIdentityMatrix creates an identity transformation matrix.
+func NewIdentityMatrix() Matrix {
+	return Matrix{1, 0, 0, 1, 0, 0}
+}
+
+// NewTranslationMatrix creates a transformation matrix with a translation tx and ty translation parameter
+func NewTranslationMatrix(tx, ty float64) Matrix {
+	return Matrix{1, 0, 0, 1, tx, ty}
+}
+
+// NewScaleMatrix creates a transformation matrix with a sx, sy scale factor
+func NewScaleMatrix(sx, sy float64) Matrix {
+	return Matrix{sx, 0, 0, sy, 0, 0}
+}
+
+// NewRotationMatrix creates a rotation transformation matrix. angle is in radian
+func NewRotationMatrix(angle float64) Matrix {
+	c := math.Cos(angle)
+	s := math.Sin(angle)
+	return Matrix{c, s, -s, c, 0, 0}
+}
+
+// NewMatrixFromRects creates a transformation matrix, combining a scale and a translation, that transform rectangle1 into rectangle2.
+func NewMatrixFromRects(rectangle1, rectangle2 [4]float64) Matrix {
+	xScale := (rectangle2[2] - rectangle2[0]) / (rectangle1[2] - rectangle1[0])
+	yScale := (rectangle2[3] - rectangle2[1]) / (rectangle1[3] - rectangle1[1])
+	xOffset := rectangle2[0] - (rectangle1[0] * xScale)
+	yOffset := rectangle2[1] - (rectangle1[1] * yScale)
+	return Matrix{xScale, 0, 0, yScale, xOffset, yOffset}
+}
+
+// Inverse computes the inverse matrix
+func (tr *Matrix) Inverse() {
+	d := tr.Determinant() // matrix determinant
+	tr0, tr1, tr2, tr3, tr4, tr5 := tr[0], tr[1], tr[2], tr[3], tr[4], tr[5]
+	tr[0] = tr3 / d
+	tr[1] = -tr1 / d
+	tr[2] = -tr2 / d
+	tr[3] = tr0 / d
+	tr[4] = (tr2*tr5 - tr3*tr4) / d
+	tr[5] = (tr1*tr4 - tr0*tr5) / d
+}
+
+func (tr Matrix) Copy() Matrix {
+	var result Matrix
+	copy(result[:], tr[:])
+	return result
+}
+
+// Compose multiplies trToConcat x tr
+func (tr *Matrix) Compose(trToCompose Matrix) {
+	tr0, tr1, tr2, tr3, tr4, tr5 := tr[0], tr[1], tr[2], tr[3], tr[4], tr[5]
+	tr[0] = trToCompose[0]*tr0 + trToCompose[1]*tr2
+	tr[1] = trToCompose[1]*tr3 + trToCompose[0]*tr1
+	tr[2] = trToCompose[2]*tr0 + trToCompose[3]*tr2
+	tr[3] = trToCompose[3]*tr3 + trToCompose[2]*tr1
+	tr[4] = trToCompose[4]*tr0 + trToCompose[5]*tr2 + tr4
+	tr[5] = trToCompose[5]*tr3 + trToCompose[4]*tr1 + tr5
+}
+
+// Scale adds a scale to the matrix
+func (tr *Matrix) Scale(sx, sy float64) {
+	tr[0] = sx * tr[0]
+	tr[1] = sx * tr[1]
+	tr[2] = sy * tr[2]
+	tr[3] = sy * tr[3]
+}
+
+// Translate adds a translation to the matrix
+func (tr *Matrix) Translate(tx, ty float64) {
+	tr[4] = tx*tr[0] + ty*tr[2] + tr[4]
+	tr[5] = ty*tr[3] + tx*tr[1] + tr[5]
+}
+
+// Rotate adds a rotation to the matrix. angle is in radian
+func (tr *Matrix) Rotate(angle float64) {
+	c := math.Cos(angle)
+	s := math.Sin(angle)
+	t0 := c*tr[0] + s*tr[2]
+	t1 := s*tr[3] + c*tr[1]
+	t2 := c*tr[2] - s*tr[0]
+	t3 := c*tr[3] - s*tr[1]
+	tr[0] = t0
+	tr[1] = t1
+	tr[2] = t2
+	tr[3] = t3
+}
+
+// GetTranslation
+func (tr Matrix) GetTranslation() (x, y float64) {
+	return tr[4], tr[5]
+}
+
+// GetScaling
+func (tr Matrix) GetScaling() (x, y float64) {
+	return tr[0], tr[3]
+}
+
+// GetScale computes a scale for the matrix
+func (tr Matrix) GetScale() float64 {
+	x := 0.707106781*tr[0] + 0.707106781*tr[1]
+	y := 0.707106781*tr[2] + 0.707106781*tr[3]
+	return math.Sqrt(x*x + y*y)
+}
+
+// ******************** Testing ********************
+
+// Equals tests if a two transformation are equal. A tolerance is applied when comparing matrix elements.
+func (tr1 Matrix) Equals(tr2 Matrix) bool {
+	for i := 0; i < 6; i = i + 1 {
+		if !fequals(tr1[i], tr2[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// IsIdentity tests if a transformation is the identity transformation. A tolerance is applied when comparing matrix elements.
+func (tr Matrix) IsIdentity() bool {
+	return fequals(tr[4], 0) && fequals(tr[5], 0) && tr.IsTranslation()
+}
+
+// IsTranslation tests if a transformation is is a pure translation. A tolerance is applied when comparing matrix elements.
+func (tr Matrix) IsTranslation() bool {
+	return fequals(tr[0], 1) && fequals(tr[1], 0) && fequals(tr[2], 0) && fequals(tr[3], 1)
+}
+
+// fequals compares two floats. return true if the distance between the two floats is less than epsilon, false otherwise
+func fequals(float1, float2 float64) bool {
+	return math.Abs(float1-float2) <= epsilon
+}

output/draw2dkit/.gitignore

@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore

paint.go

@@ -1,92 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-
-package draw2d
-
-/*
-import (
-	"image/draw"
-	"image"
-	"freetype-go.googlecode.com/hg/freetype/raster"
-)*/
-
-const M = 1<<16 - 1
-
-/*
-type NRGBAPainter struct {
-	// The image to compose onto.
-	Image *image.NRGBA
-	// The Porter-Duff composition operator.
-	Op draw.Op
-	// The 16-bit color to paint the spans.
-	cr, cg, cb, ca uint32
-}
-
-// Paint satisfies the Painter interface by painting ss onto an image.RGBA.
-func (r *NRGBAPainter) Paint(ss []raster.Span, done bool) {
-	b := r.Image.Bounds()
-	for _, s := range ss {
-		if s.Y < b.Min.Y {
-			continue
-		}
-		if s.Y >= b.Max.Y {
-			return
-		}
-		if s.X0 < b.Min.X {
-			s.X0 = b.Min.X
-		}
-		if s.X1 > b.Max.X {
-			s.X1 = b.Max.X
-		}
-		if s.X0 >= s.X1 {
-			continue
-		}
-		base := s.Y * r.Image.Stride
-		p := r.Image.Pix[base+s.X0 : base+s.X1]
-		// This code is duplicated from drawGlyphOver in $GOROOT/src/pkg/image/draw/draw.go.
-		// TODO(nigeltao): Factor out common code into a utility function, once the compiler
-		// can inline such function calls.
-		ma := s.A >> 16
-		if r.Op == draw.Over {
-			for i, nrgba := range p {
-				dr, dg, db, da := nrgba.
-				a := M - (r.ca*ma)/M
-				da = (da*a + r.ca*ma) / M
-				if da != 0 {
-					dr = minUint32(M, (dr*a+r.cr*ma)/da)
-					dg = minUint32(M, (dg*a+r.cg*ma)/da)
-					db = minUint32(M, (db*a+r.cb*ma)/da)
-				} else {
-					dr, dg, db = 0, 0, 0
-				}
-				p[i] = image.NRGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
-			}
-		} else {
-			for i, nrgba := range p {
-				dr, dg, db, da := nrgba.RGBA()
-				a := M - ma
-				da = (da*a + r.ca*ma) / M
-				if da != 0 {
-					dr = minUint32(M, (dr*a+r.cr*ma)/da)
-					dg = minUint32(M, (dg*a+r.cg*ma)/da)
-					db = minUint32(M, (db*a+r.cb*ma)/da)
-				} else {
-					dr, dg, db = 0, 0, 0
-				}
-				p[i] = image.NRGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
-			}
-		}
-	}
-
-}
-
-// SetColor sets the color to paint the spans.
-func (r *NRGBAPainter) SetColor(c image.Color) {
-	r.cr, r.cg, r.cb, r.ca = c.RGBA()
-}
-
-// NewRGBAPainter creates a new RGBAPainter for the given image.
-func NewNRGBAPainter(m *image.NRGBA) *NRGBAPainter {
-	return &NRGBAPainter{Image: m}
-}
-*/

path.go

@@ -3,37 +3,221 @@
 
 package draw2d
 
-// Path describes the interface for path drawing.
+import (
-type Path interface {
+	"fmt"
-	// LastPoint returns the current point of the path
+	"math"
+)
+
+// PathBuilder describes the interface for path drawing.
+type PathBuilder interface {
+	// LastPoint returns the current point of the current sub path
 	LastPoint() (x, y float64)
 	// MoveTo creates a new subpath that start at the specified point
 	MoveTo(x, y float64)
-	// RMoveTo creates a new subpath that start at the specified point
-	// relative to the current point
-	RMoveTo(dx, dy float64)
 	// LineTo adds a line to the current subpath
 	LineTo(x, y float64)
-	// RLineTo adds a line to the current subpath
-	// relative to the current point
-	RLineTo(dx, dy float64)
 	// QuadCurveTo adds a quadratic Bézier curve to the current subpath
 	QuadCurveTo(cx, cy, x, y float64)
-	// QuadCurveTo adds a quadratic Bézier curve to the current subpath
-	// relative to the current point
-	RQuadCurveTo(dcx, dcy, dx, dy float64)
 	// CubicCurveTo adds a cubic Bézier curve to the current subpath
 	CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)
-	// RCubicCurveTo adds a cubic Bézier curve to the current subpath
-	// relative to the current point
-	RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64)
 	// ArcTo adds an arc to the current subpath
 	ArcTo(cx, cy, rx, ry, startAngle, angle float64)
-	// RArcTo adds an arc to the current subpath
-	// relative to the current point
-	RArcTo(dcx, dcy, rx, ry, startAngle, angle float64)
 	// Close creates a line from the current point to the last MoveTo
 	// point (if not the same) and mark the path as closed so the
 	// first and last lines join nicely.
 	Close()
 }
+
+// PathCmp represents component of a path
+type PathCmp int
+
+const (
+	// MoveToCmp is a MoveTo component in a Path
+	MoveToCmp PathCmp = iota
+	// LineToCmp is a LineTo component in a Path
+	LineToCmp
+	// QuadCurveToCmp is a QuadCurveTo component in a Path
+	QuadCurveToCmp
+	// CubicCurveToCmp is a CubicCurveTo component in a Path
+	CubicCurveToCmp
+	// ArcToCmp is a ArcTo component in a Path
+	ArcToCmp
+	// CloseCmp is a ArcTo component in a Path
+	CloseCmp
+)
+
+// Path stores points
+type Path struct {
+	// Components is a slice of PathCmp in a Path and mark the role of each points in the Path
+	Components []PathCmp
+	// Points are combined with Components to have a specific role in the path
+	Points []float64
+	// Last Point of the Path
+	x, y float64
+}
+
+func (p *Path) appendToPath(cmd PathCmp, points ...float64) {
+	p.Components = append(p.Components, cmd)
+	p.Points = append(p.Points, points...)
+}
+
+// LastPoint returns the current point of the current path
+func (p *Path) LastPoint() (x, y float64) {
+	return p.x, p.y
+}
+
+// MoveTo starts a new path at (x, y) position
+func (p *Path) MoveTo(x, y float64) {
+	p.appendToPath(MoveToCmp, x, y)
+	p.x = x
+	p.y = y
+}
+
+// LineTo adds a line to the current path
+func (p *Path) LineTo(x, y float64) {
+	if len(p.Components) == 0 { //special case when no move has been done
+		p.MoveTo(x, y)
+	} else {
+		p.appendToPath(LineToCmp, x, y)
+	}
+	p.x = x
+	p.y = y
+}
+
+// QuadCurveTo adds a quadratic bezier curve to the current path
+func (p *Path) QuadCurveTo(cx, cy, x, y float64) {
+	if len(p.Components) == 0 { //special case when no move has been done
+		p.MoveTo(x, y)
+	} else {
+		p.appendToPath(QuadCurveToCmp, cx, cy, x, y)
+	}
+	p.x = x
+	p.y = y
+}
+
+// CubicCurveTo adds a cubic bezier curve to the current path
+func (p *Path) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) {
+	if len(p.Components) == 0 { //special case when no move has been done
+		p.MoveTo(x, y)
+	} else {
+		p.appendToPath(CubicCurveToCmp, cx1, cy1, cx2, cy2, x, y)
+	}
+	p.x = x
+	p.y = y
+}
+
+// ArcTo adds an arc to the path
+func (p *Path) ArcTo(cx, cy, rx, ry, startAngle, angle float64) {
+	endAngle := startAngle + angle
+	clockWise := true
+	if angle < 0 {
+		clockWise = false
+	}
+	// normalize
+	if clockWise {
+		for endAngle < startAngle {
+			endAngle += math.Pi * 2.0
+		}
+	} else {
+		for startAngle < endAngle {
+			startAngle += math.Pi * 2.0
+		}
+	}
+	startX := cx + math.Cos(startAngle)*rx
+	startY := cy + math.Sin(startAngle)*ry
+	if len(p.Components) > 0 {
+		p.LineTo(startX, startY)
+	} else {
+		p.MoveTo(startX, startY)
+	}
+	p.appendToPath(ArcToCmp, cx, cy, rx, ry, startAngle, angle)
+	p.x = cx + math.Cos(endAngle)*rx
+	p.y = cy + math.Sin(endAngle)*ry
+}
+
+// Close closes the current path
+func (p *Path) Close() {
+	p.appendToPath(CloseCmp)
+}
+
+// Copy make a clone of the current path and return it
+func (p *Path) Copy() (dest *Path) {
+	dest = new(Path)
+	dest.Components = make([]PathCmp, len(p.Components))
+	copy(dest.Components, p.Components)
+	dest.Points = make([]float64, len(p.Points))
+	copy(dest.Points, p.Points)
+	dest.x, dest.y = p.x, p.y
+	return dest
+}
+
+// Clear reset the path
+func (p *Path) Clear() {
+	p.Components = p.Components[0:0]
+	p.Points = p.Points[0:0]
+	return
+}
+
+// IsEmpty returns true if the path is empty
+func (p *Path) IsEmpty() bool {
+	return len(p.Components) == 0
+}
+
+// String returns a debug text view of the path
+func (p *Path) String() string {
+	s := ""
+	j := 0
+	for _, cmd := range p.Components {
+		switch cmd {
+		case MoveToCmp:
+			s += fmt.Sprintf("MoveTo: %f, %f\n", p.Points[j], p.Points[j+1])
+			j = j + 2
+		case LineToCmp:
+			s += fmt.Sprintf("LineTo: %f, %f\n", p.Points[j], p.Points[j+1])
+			j = j + 2
+		case QuadCurveToCmp:
+			s += fmt.Sprintf("QuadCurveTo: %f, %f, %f, %f\n", p.Points[j], p.Points[j+1], p.Points[j+2], p.Points[j+3])
+			j = j + 4
+		case CubicCurveToCmp:
+			s += fmt.Sprintf("CubicCurveTo: %f, %f, %f, %f, %f, %f\n", p.Points[j], p.Points[j+1], p.Points[j+2], p.Points[j+3], p.Points[j+4], p.Points[j+5])
+			j = j + 6
+		case ArcToCmp:
+			s += fmt.Sprintf("ArcTo: %f, %f, %f, %f, %f, %f\n", p.Points[j], p.Points[j+1], p.Points[j+2], p.Points[j+3], p.Points[j+4], p.Points[j+5])
+			j = j + 6
+		case CloseCmp:
+			s += "Close\n"
+		}
+	}
+	return s
+}
+
+// Returns new Path with flipped y axes
+func (path *Path) VerticalFlip() *Path {
+	p := path.Copy()
+	j := 0
+	for _, cmd := range p.Components {
+		switch cmd {
+		case MoveToCmp, LineToCmp:
+			p.Points[j+1] = -p.Points[j+1]
+			j = j + 2
+		case QuadCurveToCmp:
+			p.Points[j+1] = -p.Points[j+1]
+			p.Points[j+3] = -p.Points[j+3]
+			j = j + 4
+		case CubicCurveToCmp:
+			p.Points[j+1] = -p.Points[j+1]
+			p.Points[j+3] = -p.Points[j+3]
+			p.Points[j+5] = -p.Points[j+5]
+			j = j + 6
+		case ArcToCmp:
+			p.Points[j+1] = -p.Points[j+1]
+			p.Points[j+3] = -p.Points[j+3]
+			p.Points[j+4] = -p.Points[j+4] // start angle
+			p.Points[j+5] = -p.Points[j+5] // angle
+			j = j + 6
+		case CloseCmp:
+		}
+	}
+	p.y = -p.y
+	return p
+}

path_adder.go

@@ -1,93 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 13/12/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"code.google.com/p/freetype-go/freetype/raster"
-)
-
-type VertexAdder struct {
-	command VertexCommand
-	adder   raster.Adder
-}
-
-func NewVertexAdder(adder raster.Adder) *VertexAdder {
-	return &VertexAdder{VertexNoCommand, adder}
-}
-
-func (vertexAdder *VertexAdder) NextCommand(cmd VertexCommand) {
-	vertexAdder.command = cmd
-}
-
-func (vertexAdder *VertexAdder) Vertex(x, y float64) {
-	switch vertexAdder.command {
-	case VertexStartCommand:
-		vertexAdder.adder.Start(raster.Point{
-			X: raster.Fix32(x * 256),
-			Y: raster.Fix32(y * 256)})
-	default:
-		vertexAdder.adder.Add1(raster.Point{
-			X: raster.Fix32(x * 256),
-			Y: raster.Fix32(y * 256)})
-	}
-	vertexAdder.command = VertexNoCommand
-}
-
-type PathAdder struct {
-	adder              raster.Adder
-	firstPoint         raster.Point
-	ApproximationScale float64
-}
-
-func NewPathAdder(adder raster.Adder) *PathAdder {
-	return &PathAdder{adder, raster.Point{X: 0, Y: 0}, 1}
-}
-
-func (pathAdder *PathAdder) Convert(paths ...*PathStorage) {
-	for _, path := range paths {
-		j := 0
-		for _, cmd := range path.Commands {
-			switch cmd {
-			case MoveTo:
-				pathAdder.firstPoint = raster.Point{
-					X: raster.Fix32(path.Vertices[j] * 256),
-					Y: raster.Fix32(path.Vertices[j+1] * 256)}
-				pathAdder.adder.Start(pathAdder.firstPoint)
-				j += 2
-			case LineTo:
-				pathAdder.adder.Add1(raster.Point{
-					X: raster.Fix32(path.Vertices[j] * 256),
-					Y: raster.Fix32(path.Vertices[j+1] * 256)})
-				j += 2
-			case QuadCurveTo:
-				pathAdder.adder.Add2(
-					raster.Point{
-						X: raster.Fix32(path.Vertices[j] * 256),
-						Y: raster.Fix32(path.Vertices[j+1] * 256)},
-					raster.Point{
-						X: raster.Fix32(path.Vertices[j+2] * 256),
-						Y: raster.Fix32(path.Vertices[j+3] * 256)})
-				j += 4
-			case CubicCurveTo:
-				pathAdder.adder.Add3(
-					raster.Point{
-						X: raster.Fix32(path.Vertices[j] * 256),
-						Y: raster.Fix32(path.Vertices[j+1] * 256)},
-					raster.Point{
-						X: raster.Fix32(path.Vertices[j+2] * 256),
-						Y: raster.Fix32(path.Vertices[j+3] * 256)},
-					raster.Point{
-						X: raster.Fix32(path.Vertices[j+4] * 256),
-						Y: raster.Fix32(path.Vertices[j+5] * 256)})
-				j += 6
-			case ArcTo:
-				lastPoint := arcAdder(pathAdder.adder, path.Vertices[j], path.Vertices[j+1], path.Vertices[j+2], path.Vertices[j+3], path.Vertices[j+4], path.Vertices[j+5], pathAdder.ApproximationScale)
-				pathAdder.adder.Add1(lastPoint)
-				j += 6
-			case Close:
-				pathAdder.adder.Add1(pathAdder.firstPoint)
-			}
-		}
-	}
-}

path_converter.go

@@ -1,173 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 06/12/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"math"
-)
-
-type PathConverter struct {
-	converter                                     VertexConverter
-	ApproximationScale, AngleTolerance, CuspLimit float64
-	startX, startY, x, y                          float64
-}
-
-func NewPathConverter(converter VertexConverter) *PathConverter {
-	return &PathConverter{converter, 1, 0, 0, 0, 0, 0, 0}
-}
-
-func (c *PathConverter) Convert(paths ...*PathStorage) {
-	for _, path := range paths {
-		j := 0
-		for _, cmd := range path.Commands {
-			j = j + c.ConvertCommand(cmd, path.Vertices[j:]...)
-		}
-		c.converter.NextCommand(VertexStopCommand)
-	}
-}
-
-func (c *PathConverter) ConvertCommand(cmd PathCmd, vertices ...float64) int {
-	switch cmd {
-	case MoveTo:
-		c.x, c.y = vertices[0], vertices[1]
-		c.startX, c.startY = c.x, c.y
-		c.converter.NextCommand(VertexStopCommand)
-		c.converter.NextCommand(VertexStartCommand)
-		c.converter.Vertex(c.x, c.y)
-		return 2
-	case LineTo:
-		c.x, c.y = vertices[0], vertices[1]
-		if c.startX == c.x && c.startY == c.y {
-			c.converter.NextCommand(VertexCloseCommand)
-		}
-		c.converter.Vertex(c.x, c.y)
-		c.converter.NextCommand(VertexJoinCommand)
-		return 2
-	case QuadCurveTo:
-		quadraticBezier(c.converter, c.x, c.y, vertices[0], vertices[1], vertices[2], vertices[3], c.ApproximationScale, c.AngleTolerance)
-		c.x, c.y = vertices[2], vertices[3]
-		if c.startX == c.x && c.startY == c.y {
-			c.converter.NextCommand(VertexCloseCommand)
-		}
-		c.converter.Vertex(c.x, c.y)
-		return 4
-	case CubicCurveTo:
-		cubicBezier(c.converter, c.x, c.y, vertices[0], vertices[1], vertices[2], vertices[3], vertices[4], vertices[5], c.ApproximationScale, c.AngleTolerance, c.CuspLimit)
-		c.x, c.y = vertices[4], vertices[5]
-		if c.startX == c.x && c.startY == c.y {
-			c.converter.NextCommand(VertexCloseCommand)
-		}
-		c.converter.Vertex(c.x, c.y)
-		return 6
-	case ArcTo:
-		c.x, c.y = arc(c.converter, vertices[0], vertices[1], vertices[2], vertices[3], vertices[4], vertices[5], c.ApproximationScale)
-		if c.startX == c.x && c.startY == c.y {
-			c.converter.NextCommand(VertexCloseCommand)
-		}
-		c.converter.Vertex(c.x, c.y)
-		return 6
-	case Close:
-		c.converter.NextCommand(VertexCloseCommand)
-		c.converter.Vertex(c.startX, c.startY)
-		return 0
-	}
-	return 0
-}
-
-func (c *PathConverter) MoveTo(x, y float64) *PathConverter {
-	c.x, c.y = x, y
-	c.startX, c.startY = c.x, c.y
-	c.converter.NextCommand(VertexStopCommand)
-	c.converter.NextCommand(VertexStartCommand)
-	c.converter.Vertex(c.x, c.y)
-	return c
-}
-
-func (c *PathConverter) RMoveTo(dx, dy float64) *PathConverter {
-	c.MoveTo(c.x+dx, c.y+dy)
-	return c
-}
-
-func (c *PathConverter) LineTo(x, y float64) *PathConverter {
-	c.x, c.y = x, y
-	if c.startX == c.x && c.startY == c.y {
-		c.converter.NextCommand(VertexCloseCommand)
-	}
-	c.converter.Vertex(c.x, c.y)
-	c.converter.NextCommand(VertexJoinCommand)
-	return c
-}
-
-func (c *PathConverter) RLineTo(dx, dy float64) *PathConverter {
-	c.LineTo(c.x+dx, c.y+dy)
-	return c
-}
-
-func (c *PathConverter) QuadCurveTo(cx, cy, x, y float64) *PathConverter {
-	quadraticBezier(c.converter, c.x, c.y, cx, cy, x, y, c.ApproximationScale, c.AngleTolerance)
-	c.x, c.y = x, y
-	if c.startX == c.x && c.startY == c.y {
-		c.converter.NextCommand(VertexCloseCommand)
-	}
-	c.converter.Vertex(c.x, c.y)
-	return c
-}
-
-func (c *PathConverter) RQuadCurveTo(dcx, dcy, dx, dy float64) *PathConverter {
-	c.QuadCurveTo(c.x+dcx, c.y+dcy, c.x+dx, c.y+dy)
-	return c
-}
-
-func (c *PathConverter) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) *PathConverter {
-	cubicBezier(c.converter, c.x, c.y, cx1, cy1, cx2, cy2, x, y, c.ApproximationScale, c.AngleTolerance, c.CuspLimit)
-	c.x, c.y = x, y
-	if c.startX == c.x && c.startY == c.y {
-		c.converter.NextCommand(VertexCloseCommand)
-	}
-	c.converter.Vertex(c.x, c.y)
-	return c
-}
-
-func (c *PathConverter) RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64) *PathConverter {
-	c.CubicCurveTo(c.x+dcx1, c.y+dcy1, c.x+dcx2, c.y+dcy2, c.x+dx, c.y+dy)
-	return c
-}
-
-func (c *PathConverter) ArcTo(cx, cy, rx, ry, startAngle, angle float64) *PathConverter {
-	endAngle := startAngle + angle
-	clockWise := true
-	if angle < 0 {
-		clockWise = false
-	}
-	// normalize
-	if clockWise {
-		for endAngle < startAngle {
-			endAngle += math.Pi * 2.0
-		}
-	} else {
-		for startAngle < endAngle {
-			startAngle += math.Pi * 2.0
-		}
-	}
-	startX := cx + math.Cos(startAngle)*rx
-	startY := cy + math.Sin(startAngle)*ry
-	c.MoveTo(startX, startY)
-	c.x, c.y = arc(c.converter, cx, cy, rx, ry, startAngle, angle, c.ApproximationScale)
-	if c.startX == c.x && c.startY == c.y {
-		c.converter.NextCommand(VertexCloseCommand)
-	}
-	c.converter.Vertex(c.x, c.y)
-	return c
-}
-
-func (c *PathConverter) RArcTo(dcx, dcy, rx, ry, startAngle, angle float64) *PathConverter {
-	c.ArcTo(c.x+dcx, c.y+dcy, rx, ry, startAngle, angle)
-	return c
-}
-
-func (c *PathConverter) Close() *PathConverter {
-	c.converter.NextCommand(VertexCloseCommand)
-	c.converter.Vertex(c.startX, c.startY)
-	return c
-}

path_storage.go

@@ -1,184 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-
-package draw2d
-
-import (
-	"fmt"
-	"math"
-)
-
-type PathCmd int
-
-const (
-	MoveTo PathCmd = iota
-	LineTo
-	QuadCurveTo
-	CubicCurveTo
-	ArcTo
-	Close
-)
-
-type PathStorage struct {
-	Commands []PathCmd
-	Vertices []float64
-	x, y     float64
-}
-
-func NewPathStorage() (p *PathStorage) {
-	p = new(PathStorage)
-	p.Commands = make([]PathCmd, 0, 256)
-	p.Vertices = make([]float64, 0, 256)
-	return
-}
-
-func (p *PathStorage) appendToPath(cmd PathCmd, Vertices ...float64) {
-	if cap(p.Vertices) <= len(p.Vertices)+6 {
-		a := make([]PathCmd, len(p.Commands), cap(p.Commands)+256)
-		b := make([]float64, len(p.Vertices), cap(p.Vertices)+256)
-		copy(a, p.Commands)
-		p.Commands = a
-		copy(b, p.Vertices)
-		p.Vertices = b
-	}
-	p.Commands = p.Commands[0 : len(p.Commands)+1]
-	p.Commands[len(p.Commands)-1] = cmd
-	copy(p.Vertices[len(p.Vertices):len(p.Vertices)+len(Vertices)], Vertices)
-	p.Vertices = p.Vertices[0 : len(p.Vertices)+len(Vertices)]
-}
-
-func (src *PathStorage) Copy() (dest *PathStorage) {
-	dest = new(PathStorage)
-	dest.Commands = make([]PathCmd, len(src.Commands))
-	copy(dest.Commands, src.Commands)
-	dest.Vertices = make([]float64, len(src.Vertices))
-	copy(dest.Vertices, src.Vertices)
-	return dest
-}
-
-func (p *PathStorage) LastPoint() (x, y float64) {
-	return p.x, p.y
-}
-
-func (p *PathStorage) IsEmpty() bool {
-	return len(p.Commands) == 0
-}
-
-func (p *PathStorage) Close() *PathStorage {
-	p.appendToPath(Close)
-	return p
-}
-
-func (p *PathStorage) MoveTo(x, y float64) *PathStorage {
-	p.appendToPath(MoveTo, x, y)
-	p.x = x
-	p.y = y
-	return p
-}
-
-func (p *PathStorage) RMoveTo(dx, dy float64) *PathStorage {
-	x, y := p.LastPoint()
-	p.MoveTo(x+dx, y+dy)
-	return p
-}
-
-func (p *PathStorage) LineTo(x, y float64) *PathStorage {
-	p.appendToPath(LineTo, x, y)
-	p.x = x
-	p.y = y
-	return p
-}
-
-func (p *PathStorage) RLineTo(dx, dy float64) *PathStorage {
-	x, y := p.LastPoint()
-	p.LineTo(x+dx, y+dy)
-	return p
-}
-
-func (p *PathStorage) QuadCurveTo(cx, cy, x, y float64) *PathStorage {
-	p.appendToPath(QuadCurveTo, cx, cy, x, y)
-	p.x = x
-	p.y = y
-	return p
-}
-
-func (p *PathStorage) RQuadCurveTo(dcx, dcy, dx, dy float64) *PathStorage {
-	x, y := p.LastPoint()
-	p.QuadCurveTo(x+dcx, y+dcy, x+dx, y+dy)
-	return p
-}
-
-func (p *PathStorage) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) *PathStorage {
-	p.appendToPath(CubicCurveTo, cx1, cy1, cx2, cy2, x, y)
-	p.x = x
-	p.y = y
-	return p
-}
-
-func (p *PathStorage) RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64) *PathStorage {
-	x, y := p.LastPoint()
-	p.CubicCurveTo(x+dcx1, y+dcy1, x+dcx2, y+dcy2, x+dx, y+dy)
-	return p
-}
-
-func (p *PathStorage) ArcTo(cx, cy, rx, ry, startAngle, angle float64) *PathStorage {
-	endAngle := startAngle + angle
-	clockWise := true
-	if angle < 0 {
-		clockWise = false
-	}
-	// normalize
-	if clockWise {
-		for endAngle < startAngle {
-			endAngle += math.Pi * 2.0
-		}
-	} else {
-		for startAngle < endAngle {
-			startAngle += math.Pi * 2.0
-		}
-	}
-	startX := cx + math.Cos(startAngle)*rx
-	startY := cy + math.Sin(startAngle)*ry
-	if len(p.Commands) > 0 {
-		p.LineTo(startX, startY)
-	} else {
-		p.MoveTo(startX, startY)
-	}
-	p.appendToPath(ArcTo, cx, cy, rx, ry, startAngle, angle)
-	p.x = cx + math.Cos(endAngle)*rx
-	p.y = cy + math.Sin(endAngle)*ry
-	return p
-}
-
-func (p *PathStorage) RArcTo(dcx, dcy, rx, ry, startAngle, angle float64) *PathStorage {
-	x, y := p.LastPoint()
-	p.ArcTo(x+dcx, y+dcy, rx, ry, startAngle, angle)
-	return p
-}
-
-func (p *PathStorage) String() string {
-	s := ""
-	j := 0
-	for _, cmd := range p.Commands {
-		switch cmd {
-		case MoveTo:
-			s += fmt.Sprintf("MoveTo: %f, %f\n", p.Vertices[j], p.Vertices[j+1])
-			j = j + 2
-		case LineTo:
-			s += fmt.Sprintf("LineTo: %f, %f\n", p.Vertices[j], p.Vertices[j+1])
-			j = j + 2
-		case QuadCurveTo:
-			s += fmt.Sprintf("QuadCurveTo: %f, %f, %f, %f\n", p.Vertices[j], p.Vertices[j+1], p.Vertices[j+2], p.Vertices[j+3])
-			j = j + 4
-		case CubicCurveTo:
-			s += fmt.Sprintf("CubicCurveTo: %f, %f, %f, %f, %f, %f\n", p.Vertices[j], p.Vertices[j+1], p.Vertices[j+2], p.Vertices[j+3], p.Vertices[j+4], p.Vertices[j+5])
-			j = j + 6
-		case ArcTo:
-			s += fmt.Sprintf("ArcTo: %f, %f, %f, %f, %f, %f\n", p.Vertices[j], p.Vertices[j+1], p.Vertices[j+2], p.Vertices[j+3], p.Vertices[j+4], p.Vertices[j+5])
-			j = j + 6
-		case Close:
-			s += "Close\n"
-		}
-	}
-	return s
-}

raster/coverage_table.go

@@ -1,203 +0,0 @@
-// Copyright 2011 The draw2d Authors. All rights reserved.
-// created: 27/05/2011 by Laurent Le Goff
-package raster
-
-var SUBPIXEL_OFFSETS_SAMPLE_8 = [8]float64{
-	5.0 / 8,
-	0.0 / 8,
-	3.0 / 8,
-	6.0 / 8,
-	1.0 / 8,
-	4.0 / 8,
-	7.0 / 8,
-	2.0 / 8,
-}
-
-var SUBPIXEL_OFFSETS_SAMPLE_8_FIXED = [8]Fix{
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[0] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[1] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[2] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[3] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[4] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[5] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[6] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_8[7] * FIXED_FLOAT_COEF),
-}
-
-var SUBPIXEL_OFFSETS_SAMPLE_16 = [16]float64{
-	1.0 / 16,
-	8.0 / 16,
-	4.0 / 16,
-	15.0 / 16,
-	11.0 / 16,
-	2.0 / 16,
-	6.0 / 16,
-	14.0 / 16,
-	10.0 / 16,
-	3.0 / 16,
-	7.0 / 16,
-	12.0 / 16,
-	0.0 / 16,
-	9.0 / 16,
-	5.0 / 16,
-	13.0 / 16,
-}
-
-var SUBPIXEL_OFFSETS_SAMPLE_16_FIXED = [16]Fix{
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[0] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[1] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[2] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[3] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[4] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[5] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[6] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[7] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[8] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[9] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[10] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[11] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[12] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[13] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[14] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_16[15] * FIXED_FLOAT_COEF),
-}
-
-var SUBPIXEL_OFFSETS_SAMPLE_32 = [32]float64{
-	28.0 / 32,
-	13.0 / 32,
-	6.0 / 32,
-	23.0 / 32,
-	0.0 / 32,
-	17.0 / 32,
-	10.0 / 32,
-	27.0 / 32,
-	4.0 / 32,
-	21.0 / 32,
-	14.0 / 32,
-	31.0 / 32,
-	8.0 / 32,
-	25.0 / 32,
-	18.0 / 32,
-	3.0 / 32,
-	12.0 / 32,
-	29.0 / 32,
-	22.0 / 32,
-	7.0 / 32,
-	16.0 / 32,
-	1.0 / 32,
-	26.0 / 32,
-	11.0 / 32,
-	20.0 / 32,
-	5.0 / 32,
-	30.0 / 32,
-	15.0 / 32,
-	24.0 / 32,
-	9.0 / 32,
-	2.0 / 32,
-	19.0 / 32,
-}
-var SUBPIXEL_OFFSETS_SAMPLE_32_FIXED = [32]Fix{
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[0] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[1] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[2] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[3] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[4] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[5] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[6] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[7] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[8] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[9] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[10] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[11] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[12] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[13] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[14] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[15] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[16] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[17] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[18] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[19] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[20] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[21] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[22] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[23] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[24] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[25] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[26] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[27] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[28] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[29] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[30] * FIXED_FLOAT_COEF),
-	Fix(SUBPIXEL_OFFSETS_SAMPLE_32[31] * FIXED_FLOAT_COEF),
-}
-
-var coverageTable = [256]uint8{
-	pixelCoverage(0x00), pixelCoverage(0x01), pixelCoverage(0x02), pixelCoverage(0x03),
-	pixelCoverage(0x04), pixelCoverage(0x05), pixelCoverage(0x06), pixelCoverage(0x07),
-	pixelCoverage(0x08), pixelCoverage(0x09), pixelCoverage(0x0a), pixelCoverage(0x0b),
-	pixelCoverage(0x0c), pixelCoverage(0x0d), pixelCoverage(0x0e), pixelCoverage(0x0f),
-	pixelCoverage(0x10), pixelCoverage(0x11), pixelCoverage(0x12), pixelCoverage(0x13),
-	pixelCoverage(0x14), pixelCoverage(0x15), pixelCoverage(0x16), pixelCoverage(0x17),
-	pixelCoverage(0x18), pixelCoverage(0x19), pixelCoverage(0x1a), pixelCoverage(0x1b),
-	pixelCoverage(0x1c), pixelCoverage(0x1d), pixelCoverage(0x1e), pixelCoverage(0x1f),
-	pixelCoverage(0x20), pixelCoverage(0x21), pixelCoverage(0x22), pixelCoverage(0x23),
-	pixelCoverage(0x24), pixelCoverage(0x25), pixelCoverage(0x26), pixelCoverage(0x27),
-	pixelCoverage(0x28), pixelCoverage(0x29), pixelCoverage(0x2a), pixelCoverage(0x2b),
-	pixelCoverage(0x2c), pixelCoverage(0x2d), pixelCoverage(0x2e), pixelCoverage(0x2f),
-	pixelCoverage(0x30), pixelCoverage(0x31), pixelCoverage(0x32), pixelCoverage(0x33),
-	pixelCoverage(0x34), pixelCoverage(0x35), pixelCoverage(0x36), pixelCoverage(0x37),
-	pixelCoverage(0x38), pixelCoverage(0x39), pixelCoverage(0x3a), pixelCoverage(0x3b),
-	pixelCoverage(0x3c), pixelCoverage(0x3d), pixelCoverage(0x3e), pixelCoverage(0x3f),
-	pixelCoverage(0x40), pixelCoverage(0x41), pixelCoverage(0x42), pixelCoverage(0x43),
-	pixelCoverage(0x44), pixelCoverage(0x45), pixelCoverage(0x46), pixelCoverage(0x47),
-	pixelCoverage(0x48), pixelCoverage(0x49), pixelCoverage(0x4a), pixelCoverage(0x4b),
-	pixelCoverage(0x4c), pixelCoverage(0x4d), pixelCoverage(0x4e), pixelCoverage(0x4f),
-	pixelCoverage(0x50), pixelCoverage(0x51), pixelCoverage(0x52), pixelCoverage(0x53),
-	pixelCoverage(0x54), pixelCoverage(0x55), pixelCoverage(0x56), pixelCoverage(0x57),
-	pixelCoverage(0x58), pixelCoverage(0x59), pixelCoverage(0x5a), pixelCoverage(0x5b),
-	pixelCoverage(0x5c), pixelCoverage(0x5d), pixelCoverage(0x5e), pixelCoverage(0x5f),
-	pixelCoverage(0x60), pixelCoverage(0x61), pixelCoverage(0x62), pixelCoverage(0x63),
-	pixelCoverage(0x64), pixelCoverage(0x65), pixelCoverage(0x66), pixelCoverage(0x67),
-	pixelCoverage(0x68), pixelCoverage(0x69), pixelCoverage(0x6a), pixelCoverage(0x6b),
-	pixelCoverage(0x6c), pixelCoverage(0x6d), pixelCoverage(0x6e), pixelCoverage(0x6f),
-	pixelCoverage(0x70), pixelCoverage(0x71), pixelCoverage(0x72), pixelCoverage(0x73),
-	pixelCoverage(0x74), pixelCoverage(0x75), pixelCoverage(0x76), pixelCoverage(0x77),
-	pixelCoverage(0x78), pixelCoverage(0x79), pixelCoverage(0x7a), pixelCoverage(0x7b),
-	pixelCoverage(0x7c), pixelCoverage(0x7d), pixelCoverage(0x7e), pixelCoverage(0x7f),
-	pixelCoverage(0x80), pixelCoverage(0x81), pixelCoverage(0x82), pixelCoverage(0x83),
-	pixelCoverage(0x84), pixelCoverage(0x85), pixelCoverage(0x86), pixelCoverage(0x87),
-	pixelCoverage(0x88), pixelCoverage(0x89), pixelCoverage(0x8a), pixelCoverage(0x8b),
-	pixelCoverage(0x8c), pixelCoverage(0x8d), pixelCoverage(0x8e), pixelCoverage(0x8f),
-	pixelCoverage(0x90), pixelCoverage(0x91), pixelCoverage(0x92), pixelCoverage(0x93),
-	pixelCoverage(0x94), pixelCoverage(0x95), pixelCoverage(0x96), pixelCoverage(0x97),
-	pixelCoverage(0x98), pixelCoverage(0x99), pixelCoverage(0x9a), pixelCoverage(0x9b),
-	pixelCoverage(0x9c), pixelCoverage(0x9d), pixelCoverage(0x9e), pixelCoverage(0x9f),
-	pixelCoverage(0xa0), pixelCoverage(0xa1), pixelCoverage(0xa2), pixelCoverage(0xa3),
-	pixelCoverage(0xa4), pixelCoverage(0xa5), pixelCoverage(0xa6), pixelCoverage(0xa7),
-	pixelCoverage(0xa8), pixelCoverage(0xa9), pixelCoverage(0xaa), pixelCoverage(0xab),
-	pixelCoverage(0xac), pixelCoverage(0xad), pixelCoverage(0xae), pixelCoverage(0xaf),
-	pixelCoverage(0xb0), pixelCoverage(0xb1), pixelCoverage(0xb2), pixelCoverage(0xb3),
-	pixelCoverage(0xb4), pixelCoverage(0xb5), pixelCoverage(0xb6), pixelCoverage(0xb7),
-	pixelCoverage(0xb8), pixelCoverage(0xb9), pixelCoverage(0xba), pixelCoverage(0xbb),
-	pixelCoverage(0xbc), pixelCoverage(0xbd), pixelCoverage(0xbe), pixelCoverage(0xbf),
-	pixelCoverage(0xc0), pixelCoverage(0xc1), pixelCoverage(0xc2), pixelCoverage(0xc3),
-	pixelCoverage(0xc4), pixelCoverage(0xc5), pixelCoverage(0xc6), pixelCoverage(0xc7),
-	pixelCoverage(0xc8), pixelCoverage(0xc9), pixelCoverage(0xca), pixelCoverage(0xcb),
-	pixelCoverage(0xcc), pixelCoverage(0xcd), pixelCoverage(0xce), pixelCoverage(0xcf),
-	pixelCoverage(0xd0), pixelCoverage(0xd1), pixelCoverage(0xd2), pixelCoverage(0xd3),
-	pixelCoverage(0xd4), pixelCoverage(0xd5), pixelCoverage(0xd6), pixelCoverage(0xd7),
-	pixelCoverage(0xd8), pixelCoverage(0xd9), pixelCoverage(0xda), pixelCoverage(0xdb),
-	pixelCoverage(0xdc), pixelCoverage(0xdd), pixelCoverage(0xde), pixelCoverage(0xdf),
-	pixelCoverage(0xe0), pixelCoverage(0xe1), pixelCoverage(0xe2), pixelCoverage(0xe3),
-	pixelCoverage(0xe4), pixelCoverage(0xe5), pixelCoverage(0xe6), pixelCoverage(0xe7),
-	pixelCoverage(0xe8), pixelCoverage(0xe9), pixelCoverage(0xea), pixelCoverage(0xeb),
-	pixelCoverage(0xec), pixelCoverage(0xed), pixelCoverage(0xee), pixelCoverage(0xef),
-	pixelCoverage(0xf0), pixelCoverage(0xf1), pixelCoverage(0xf2), pixelCoverage(0xf3),
-	pixelCoverage(0xf4), pixelCoverage(0xf5), pixelCoverage(0xf6), pixelCoverage(0xf7),
-	pixelCoverage(0xf8), pixelCoverage(0xf9), pixelCoverage(0xfa), pixelCoverage(0xfb),
-	pixelCoverage(0xfc), pixelCoverage(0xfd), pixelCoverage(0xfe), pixelCoverage(0xff),
-}
-
-func pixelCoverage(a uint8) uint8 {
-	return a&1 + a>>1&1 + a>>2&1 + a>>3&1 + a>>4&1 + a>>5&1 + a>>6&1 + a>>7&1
-}

raster/fillerAA.go

@@ -1,320 +0,0 @@
-// Copyright 2011 The draw2d Authors. All rights reserved.
-// created: 27/05/2011 by Laurent Le Goff
-package raster
-
-import (
-	"image"
-	"image/color"
-	"unsafe"
-)
-
-const (
-	SUBPIXEL_SHIFT = 3
-	SUBPIXEL_COUNT = 1 << SUBPIXEL_SHIFT
-)
-
-var SUBPIXEL_OFFSETS = SUBPIXEL_OFFSETS_SAMPLE_8_FIXED
-
-type SUBPIXEL_DATA uint8
-type NON_ZERO_MASK_DATA_UNIT uint8
-
-type Rasterizer8BitsSample struct {
-	MaskBuffer    []SUBPIXEL_DATA
-	WindingBuffer []NON_ZERO_MASK_DATA_UNIT
-
-	Width           int
-	BufferWidth     int
-	Height          int
-	ClipBound       [4]float64
-	RemappingMatrix [6]float64
-}
-
-/*  width and height define the maximum output size for the filler.
- *  The filler will output to larger bitmaps as well, but the output will
- *  be cropped.
- */
-func NewRasterizer8BitsSample(width, height int) *Rasterizer8BitsSample {
-	var r Rasterizer8BitsSample
-	// Scale the coordinates by SUBPIXEL_COUNT in vertical direction
-	// The sampling point for the sub-pixel is at the top right corner. This
-	// adjustment moves it to the pixel center.
-	r.RemappingMatrix = [6]float64{1, 0, 0, SUBPIXEL_COUNT, 0.5 / SUBPIXEL_COUNT, -0.5 * SUBPIXEL_COUNT}
-	r.Width = width
-	r.Height = height
-	// The buffer used for filling needs to be one pixel wider than the bitmap.
-	// This is because the end flag that turns the fill of is the first pixel
-	// after the actually drawn edge.
-	r.BufferWidth = width + 1
-
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*height)
-	r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*height*SUBPIXEL_COUNT)
-	r.ClipBound = clip(0, 0, width, height, SUBPIXEL_COUNT)
-	return &r
-}
-
-func clip(x, y, width, height, scale int) [4]float64 {
-	var clipBound [4]float64
-
-	offset := 0.99 / float64(scale)
-
-	clipBound[0] = float64(x) + offset
-	clipBound[2] = float64(x+width) - offset
-
-	clipBound[1] = float64(y * scale)
-	clipBound[3] = float64((y + height) * scale)
-	return clipBound
-}
-
-func intersect(r1, r2 [4]float64) [4]float64 {
-	if r1[0] < r2[0] {
-		r1[0] = r2[0]
-	}
-	if r1[2] > r2[2] {
-		r1[2] = r2[2]
-	}
-	if r1[0] > r1[2] {
-		r1[0] = r1[2]
-	}
-
-	if r1[1] < r2[1] {
-		r1[1] = r2[1]
-	}
-	if r1[3] > r2[3] {
-		r1[3] = r2[3]
-	}
-	if r1[1] > r1[3] {
-		r1[1] = r1[3]
-	}
-	return r1
-}
-
-func (r *Rasterizer8BitsSample) RenderEvenOdd(img *image.RGBA, color *color.RGBA, polygon *Polygon, tr [6]float64) {
-	// memset 0 the mask buffer
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
-
-	// inline matrix multiplication
-	transform := [6]float64{
-		tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
-		tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
-		tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
-		tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
-		tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
-		tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
-	}
-
-	clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
-	clipRect = intersect(clipRect, r.ClipBound)
-	p := 0
-	l := len(*polygon) / 2
-	var edges [32]PolygonEdge
-	for p < l {
-		edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
-		for k := 0; k < edgeCount; k++ {
-			r.addEvenOddEdge(&edges[k])
-		}
-		p += 16
-	}
-
-	r.fillEvenOdd(img, color, clipRect)
-}
-
-//! Adds an edge to be used with even-odd fill.
-func (r *Rasterizer8BitsSample) addEvenOddEdge(edge *PolygonEdge) {
-	x := Fix(edge.X * FIXED_FLOAT_COEF)
-	slope := Fix(edge.Slope * FIXED_FLOAT_COEF)
-	slopeFix := Fix(0)
-	if edge.LastLine-edge.FirstLine >= SLOPE_FIX_STEP {
-		slopeFix = Fix(edge.Slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) - slope<<SLOPE_FIX_SHIFT
-	}
-
-	var mask SUBPIXEL_DATA
-	var ySub uint32
-	var xp, yLine int
-	for y := edge.FirstLine; y <= edge.LastLine; y++ {
-		ySub = uint32(y & (SUBPIXEL_COUNT - 1))
-		xp = int((x + SUBPIXEL_OFFSETS[ySub]) >> FIXED_SHIFT)
-		mask = SUBPIXEL_DATA(1 << ySub)
-		yLine = y >> SUBPIXEL_SHIFT
-		r.MaskBuffer[yLine*r.BufferWidth+xp] ^= mask
-		x += slope
-		if y&SLOPE_FIX_MASK == 0 {
-			x += slopeFix
-		}
-	}
-}
-
-//! Adds an edge to be used with non-zero winding fill.
-func (r *Rasterizer8BitsSample) addNonZeroEdge(edge *PolygonEdge) {
-	x := Fix(edge.X * FIXED_FLOAT_COEF)
-	slope := Fix(edge.Slope * FIXED_FLOAT_COEF)
-	slopeFix := Fix(0)
-	if edge.LastLine-edge.FirstLine >= SLOPE_FIX_STEP {
-		slopeFix = Fix(edge.Slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) - slope<<SLOPE_FIX_SHIFT
-	}
-	var mask SUBPIXEL_DATA
-	var ySub uint32
-	var xp, yLine int
-	winding := NON_ZERO_MASK_DATA_UNIT(edge.Winding)
-	for y := edge.FirstLine; y <= edge.LastLine; y++ {
-		ySub = uint32(y & (SUBPIXEL_COUNT - 1))
-		xp = int((x + SUBPIXEL_OFFSETS[ySub]) >> FIXED_SHIFT)
-		mask = SUBPIXEL_DATA(1 << ySub)
-		yLine = y >> SUBPIXEL_SHIFT
-		r.MaskBuffer[yLine*r.BufferWidth+xp] |= mask
-		r.WindingBuffer[(yLine*r.BufferWidth+xp)*SUBPIXEL_COUNT+int(ySub)] += winding
-		x += slope
-		if y&SLOPE_FIX_MASK == 0 {
-			x += slopeFix
-		}
-	}
-}
-
-// Renders the mask to the canvas with even-odd fill.
-func (r *Rasterizer8BitsSample) fillEvenOdd(img *image.RGBA, color *color.RGBA, clipBound [4]float64) {
-	var x, y uint32
-
-	minX := uint32(clipBound[0])
-	maxX := uint32(clipBound[2])
-
-	minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
-	maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
-
-	//pixColor :=  (uint32(color.R) << 24) |  (uint32(color.G) << 16) |  (uint32(color.B) << 8) | uint32(color.A)
-	pixColor := (*uint32)(unsafe.Pointer(color))
-	cs1 := *pixColor & 0xff00ff
-	cs2 := *pixColor >> 8 & 0xff00ff
-
-	stride := uint32(img.Stride)
-	var mask SUBPIXEL_DATA
-
-	for y = minY; y < maxY; y++ {
-		tp := img.Pix[y*stride:]
-
-		mask = 0
-		for x = minX; x <= maxX; x++ {
-			p := (*uint32)(unsafe.Pointer(&tp[x]))
-			mask ^= r.MaskBuffer[y*uint32(r.BufferWidth)+x]
-			// 8bits
-			alpha := uint32(coverageTable[mask])
-			// 16bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
-			// 32bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
-
-			// alpha is in range of 0 to SUBPIXEL_COUNT
-			invAlpha := SUBPIXEL_COUNT - alpha
-
-			ct1 := *p & 0xff00ff * invAlpha
-			ct2 := *p >> 8 & 0xff00ff * invAlpha
-
-			ct1 = (ct1 + cs1*alpha) >> SUBPIXEL_SHIFT & 0xff00ff
-			ct2 = (ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT) & 0xff00ff00
-
-			*p = ct1 + ct2
-		}
-	}
-}
-
-/*
- * Renders the polygon with non-zero winding fill.
- *  param aTarget the target bitmap.
- *  param aPolygon the polygon to render.
- *  param aColor the color to be used for rendering.
- *  param aTransformation the transformation matrix.
- */
-func (r *Rasterizer8BitsSample) RenderNonZeroWinding(img *image.RGBA, color *color.RGBA, polygon *Polygon, tr [6]float64) {
-
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
-	r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*r.Height*SUBPIXEL_COUNT)
-
-	// inline matrix multiplication
-	transform := [6]float64{
-		tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
-		tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
-		tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
-		tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
-		tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
-		tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
-	}
-
-	clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
-	clipRect = intersect(clipRect, r.ClipBound)
-
-	p := 0
-	l := len(*polygon) / 2
-	var edges [32]PolygonEdge
-	for p < l {
-		edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
-		for k := 0; k < edgeCount; k++ {
-			r.addNonZeroEdge(&edges[k])
-		}
-		p += 16
-	}
-
-	r.fillNonZero(img, color, clipRect)
-}
-
-//! Renders the mask to the canvas with non-zero winding fill.
-func (r *Rasterizer8BitsSample) fillNonZero(img *image.RGBA, color *color.RGBA, clipBound [4]float64) {
-	var x, y uint32
-
-	minX := uint32(clipBound[0])
-	maxX := uint32(clipBound[2])
-
-	minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
-	maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
-
-	//pixColor :=  (uint32(color.R) << 24) |  (uint32(color.G) << 16) |  (uint32(color.B) << 8) | uint32(color.A)
-	pixColor := (*uint32)(unsafe.Pointer(color))
-	cs1 := *pixColor & 0xff00ff
-	cs2 := *pixColor >> 8 & 0xff00ff
-
-	stride := uint32(img.Stride)
-	var mask SUBPIXEL_DATA
-	var n uint32
-	var values [SUBPIXEL_COUNT]NON_ZERO_MASK_DATA_UNIT
-	for n = 0; n < SUBPIXEL_COUNT; n++ {
-		values[n] = 0
-	}
-
-	for y = minY; y < maxY; y++ {
-		tp := img.Pix[y*stride:]
-
-		mask = 0
-		for x = minX; x <= maxX; x++ {
-			p := (*uint32)(unsafe.Pointer(&tp[x]))
-			temp := r.MaskBuffer[y*uint32(r.BufferWidth)+x]
-			if temp != 0 {
-				var bit SUBPIXEL_DATA = 1
-				for n = 0; n < SUBPIXEL_COUNT; n++ {
-					if temp&bit != 0 {
-						t := values[n]
-						values[n] += r.WindingBuffer[(y*uint32(r.BufferWidth)+x)*SUBPIXEL_COUNT+n]
-						if (t == 0 || values[n] == 0) && t != values[n] {
-							mask ^= bit
-						}
-					}
-					bit <<= 1
-				}
-			}
-
-			// 8bits
-			alpha := uint32(coverageTable[mask])
-			// 16bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
-			// 32bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
-
-			// alpha is in range of 0 to SUBPIXEL_COUNT
-			invAlpha := uint32(SUBPIXEL_COUNT) - alpha
-
-			ct1 := *p & 0xff00ff * invAlpha
-			ct2 := *p >> 8 & 0xff00ff * invAlpha
-
-			ct1 = (ct1 + cs1*alpha) >> SUBPIXEL_SHIFT & 0xff00ff
-			ct2 = (ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT) & 0xff00ff00
-
-			*p = ct1 + ct2
-		}
-	}
-}

raster/fillerV1/fillerAA.go

@@ -1,306 +0,0 @@
-// Copyright 2011 The draw2d Authors. All rights reserved.
-// created: 27/05/2011 by Laurent Le Goff
-
-// +build ignore
-
-package raster
-
-import (
-	"image"
-	"image/color"
-	"unsafe"
-)
-
-const (
-	SUBPIXEL_SHIFT = 3
-	SUBPIXEL_COUNT = 1 << SUBPIXEL_SHIFT
-)
-
-var SUBPIXEL_OFFSETS = SUBPIXEL_OFFSETS_SAMPLE_8
-
-type SUBPIXEL_DATA uint16
-type NON_ZERO_MASK_DATA_UNIT uint8
-
-type Rasterizer8BitsSample struct {
-	MaskBuffer    []SUBPIXEL_DATA
-	WindingBuffer []NON_ZERO_MASK_DATA_UNIT
-
-	Width           int
-	BufferWidth     int
-	Height          int
-	ClipBound       [4]float64
-	RemappingMatrix [6]float64
-}
-
-/*  width and height define the maximum output size for the filler.
- *  The filler will output to larger bitmaps as well, but the output will
- *  be cropped.
- */
-func NewRasterizer8BitsSample(width, height int) *Rasterizer8BitsSample {
-	var r Rasterizer8BitsSample
-	// Scale the coordinates by SUBPIXEL_COUNT in vertical direction
-	// The sampling point for the sub-pixel is at the top right corner. This
-	// adjustment moves it to the pixel center.
-	r.RemappingMatrix = [6]float64{1, 0, 0, SUBPIXEL_COUNT, 0.5 / SUBPIXEL_COUNT, -0.5 * SUBPIXEL_COUNT}
-	r.Width = width
-	r.Height = height
-	// The buffer used for filling needs to be one pixel wider than the bitmap.
-	// This is because the end flag that turns the fill of is the first pixel
-	// after the actually drawn edge.
-	r.BufferWidth = width + 1
-
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*height)
-	r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*height*SUBPIXEL_COUNT)
-	r.ClipBound = clip(0, 0, width, height, SUBPIXEL_COUNT)
-	return &r
-}
-
-func clip(x, y, width, height, scale int) [4]float64 {
-	var clipBound [4]float64
-
-	offset := 0.99 / float64(scale)
-
-	clipBound[0] = float64(x) + offset
-	clipBound[2] = float64(x+width) - offset
-
-	clipBound[1] = float64(y * scale)
-	clipBound[3] = float64((y + height) * scale)
-	return clipBound
-}
-
-func intersect(r1, r2 [4]float64) [4]float64 {
-	if r1[0] < r2[0] {
-		r1[0] = r2[0]
-	}
-	if r1[2] > r2[2] {
-		r1[2] = r2[2]
-	}
-	if r1[0] > r1[2] {
-		r1[0] = r1[2]
-	}
-
-	if r1[1] < r2[1] {
-		r1[1] = r2[1]
-	}
-	if r1[3] > r2[3] {
-		r1[3] = r2[3]
-	}
-	if r1[1] > r1[3] {
-		r1[1] = r1[3]
-	}
-	return r1
-}
-
-func (r *Rasterizer8BitsSample) RenderEvenOdd(img *image.RGBA, color *color.RGBA, polygon *Polygon, tr [6]float64) {
-	// memset 0 the mask buffer
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
-
-	// inline matrix multiplication
-	transform := [6]float64{
-		tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
-		tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
-		tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
-		tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
-		tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
-		tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
-	}
-
-	clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
-	clipRect = intersect(clipRect, r.ClipBound)
-	p := 0
-	l := len(*polygon) / 2
-	var edges [32]PolygonEdge
-	for p < l {
-		edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
-		for k := 0; k < edgeCount; k++ {
-			r.addEvenOddEdge(&edges[k])
-		}
-		p += 16
-	}
-
-	r.fillEvenOdd(img, color, clipRect)
-}
-
-//! Adds an edge to be used with even-odd fill.
-func (r *Rasterizer8BitsSample) addEvenOddEdge(edge *PolygonEdge) {
-	x := edge.X
-	slope := edge.Slope
-	var ySub, mask SUBPIXEL_DATA
-	var xp, yLine int
-	for y := edge.FirstLine; y <= edge.LastLine; y++ {
-		ySub = SUBPIXEL_DATA(y & (SUBPIXEL_COUNT - 1))
-		xp = int(x + SUBPIXEL_OFFSETS[ySub])
-		mask = SUBPIXEL_DATA(1 << ySub)
-		yLine = y >> SUBPIXEL_SHIFT
-		r.MaskBuffer[yLine*r.BufferWidth+xp] ^= mask
-		x += slope
-	}
-}
-
-// Renders the mask to the canvas with even-odd fill.
-func (r *Rasterizer8BitsSample) fillEvenOdd(img *image.RGBA, color *color.RGBA, clipBound [4]float64) {
-	var x, y uint32
-
-	minX := uint32(clipBound[0])
-	maxX := uint32(clipBound[2])
-
-	minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
-	maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
-
-	//pixColor :=  (uint32(color.R) << 24) |  (uint32(color.G) << 16) |  (uint32(color.B) << 8) | uint32(color.A)
-	pixColor := (*uint32)(unsafe.Pointer(color))
-	cs1 := *pixColor & 0xff00ff
-	cs2 := *pixColor >> 8 & 0xff00ff
-
-	stride := uint32(img.Stride)
-	var mask SUBPIXEL_DATA
-
-	for y = minY; y < maxY; y++ {
-		tp := img.Pix[y*stride:]
-
-		mask = 0
-		for x = minX; x <= maxX; x++ {
-			p := (*uint32)(unsafe.Pointer(&tp[x]))
-			mask ^= r.MaskBuffer[y*uint32(r.BufferWidth)+x]
-			// 8bits
-			alpha := uint32(coverageTable[mask])
-			// 16bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
-			// 32bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
-
-			// alpha is in range of 0 to SUBPIXEL_COUNT
-			invAlpha := uint32(SUBPIXEL_COUNT) - alpha
-
-			ct1 := *p & 0xff00ff * invAlpha
-			ct2 := *p >> 8 & 0xff00ff * invAlpha
-
-			ct1 = (ct1 + cs1*alpha) >> SUBPIXEL_SHIFT & 0xff00ff
-			ct2 = (ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT) & 0xff00ff00
-
-			*p = ct1 + ct2
-		}
-	}
-}
-
-/*
- * Renders the polygon with non-zero winding fill.
- *  param aTarget the target bitmap.
- *  param aPolygon the polygon to render.
- *  param aColor the color to be used for rendering.
- *  param aTransformation the transformation matrix.
- */
-func (r *Rasterizer8BitsSample) RenderNonZeroWinding(img *image.RGBA, color *color.RGBA, polygon *Polygon, tr [6]float64) {
-
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
-	r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*r.Height*SUBPIXEL_COUNT)
-
-	// inline matrix multiplication
-	transform := [6]float64{
-		tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
-		tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
-		tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
-		tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
-		tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
-		tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
-	}
-
-	clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
-	clipRect = intersect(clipRect, r.ClipBound)
-
-	p := 0
-	l := len(*polygon) / 2
-	var edges [32]PolygonEdge
-	for p < l {
-		edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
-		for k := 0; k < edgeCount; k++ {
-			r.addNonZeroEdge(&edges[k])
-		}
-		p += 16
-	}
-
-	r.fillNonZero(img, color, clipRect)
-}
-
-//! Adds an edge to be used with non-zero winding fill.
-func (r *Rasterizer8BitsSample) addNonZeroEdge(edge *PolygonEdge) {
-	x := edge.X
-	slope := edge.Slope
-	var ySub, mask SUBPIXEL_DATA
-	var xp, yLine int
-	winding := NON_ZERO_MASK_DATA_UNIT(edge.Winding)
-	for y := edge.FirstLine; y <= edge.LastLine; y++ {
-		ySub = SUBPIXEL_DATA(y & (SUBPIXEL_COUNT - 1))
-		xp = int(x + SUBPIXEL_OFFSETS[ySub])
-		mask = SUBPIXEL_DATA(1 << ySub)
-		yLine = y >> SUBPIXEL_SHIFT
-		r.MaskBuffer[yLine*r.BufferWidth+xp] |= mask
-		r.WindingBuffer[(yLine*r.BufferWidth+xp)*SUBPIXEL_COUNT+int(ySub)] += winding
-		x += slope
-	}
-}
-
-//! Renders the mask to the canvas with non-zero winding fill.
-func (r *Rasterizer8BitsSample) fillNonZero(img *image.RGBA, color *color.RGBA, clipBound [4]float64) {
-	var x, y uint32
-
-	minX := uint32(clipBound[0])
-	maxX := uint32(clipBound[2])
-
-	minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
-	maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
-
-	//pixColor :=  (uint32(color.R) << 24) |  (uint32(color.G) << 16) |  (uint32(color.B) << 8) | uint32(color.A)
-	pixColor := (*uint32)(unsafe.Pointer(color))
-	cs1 := *pixColor & 0xff00ff
-	cs2 := *pixColor >> 8 & 0xff00ff
-
-	stride := uint32(img.Stride)
-	var mask SUBPIXEL_DATA
-	var n uint32
-	var values [SUBPIXEL_COUNT]NON_ZERO_MASK_DATA_UNIT
-	for n = 0; n < SUBPIXEL_COUNT; n++ {
-		values[n] = 0
-	}
-
-	for y = minY; y < maxY; y++ {
-		tp := img.Pix[y*stride:]
-
-		mask = 0
-		for x = minX; x <= maxX; x++ {
-			p := (*uint32)(unsafe.Pointer(&tp[x]))
-			temp := r.MaskBuffer[y*uint32(r.BufferWidth)+x]
-			if temp != 0 {
-				var bit SUBPIXEL_DATA = 1
-				for n = 0; n < SUBPIXEL_COUNT; n++ {
-					if temp&bit != 0 {
-						t := values[n]
-						values[n] += r.WindingBuffer[(y*uint32(r.BufferWidth)+x)*SUBPIXEL_COUNT+n]
-						if (t == 0 || values[n] == 0) && t != values[n] {
-							mask ^= bit
-						}
-					}
-					bit <<= 1
-				}
-			}
-
-			// 8bits
-			alpha := uint32(coverageTable[mask])
-			// 16bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
-			// 32bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
-
-			// alpha is in range of 0 to SUBPIXEL_COUNT
-			invAlpha := uint32(SUBPIXEL_COUNT) - alpha
-
-			ct1 := *p & 0xff00ff * invAlpha
-			ct2 := *p >> 8 & 0xff00ff * invAlpha
-
-			ct1 = (ct1 + cs1*alpha) >> SUBPIXEL_SHIFT & 0xff00ff
-			ct2 = (ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT) & 0xff00ff00
-
-			*p = ct1 + ct2
-		}
-	}
-}

raster/fillerV2/fillerAA.go

@@ -1,323 +0,0 @@
-// Copyright 2011 The draw2d Authors. All rights reserved.
-// created: 27/05/2011 by Laurent Le Goff
-
-// +build ignore
-
-package raster
-
-import (
-	"image"
-	"image/color"
-	"unsafe"
-)
-
-const (
-	SUBPIXEL_SHIFT = 5
-	SUBPIXEL_COUNT = 1 << SUBPIXEL_SHIFT
-)
-
-var SUBPIXEL_OFFSETS = SUBPIXEL_OFFSETS_SAMPLE_32_FIXED
-
-type SUBPIXEL_DATA uint32
-type NON_ZERO_MASK_DATA_UNIT uint8
-
-type Rasterizer8BitsSample struct {
-	MaskBuffer    []SUBPIXEL_DATA
-	WindingBuffer []NON_ZERO_MASK_DATA_UNIT
-
-	Width           int
-	BufferWidth     int
-	Height          int
-	ClipBound       [4]float64
-	RemappingMatrix [6]float64
-}
-
-/*  width and height define the maximum output size for the filler.
- *  The filler will output to larger bitmaps as well, but the output will
- *  be cropped.
- */
-func NewRasterizer8BitsSample(width, height int) *Rasterizer8BitsSample {
-	var r Rasterizer8BitsSample
-	// Scale the coordinates by SUBPIXEL_COUNT in vertical direction
-	// The sampling point for the sub-pixel is at the top right corner. This
-	// adjustment moves it to the pixel center.
-	r.RemappingMatrix = [6]float64{1, 0, 0, SUBPIXEL_COUNT, 0.5 / SUBPIXEL_COUNT, -0.5 * SUBPIXEL_COUNT}
-	r.Width = width
-	r.Height = height
-	// The buffer used for filling needs to be one pixel wider than the bitmap.
-	// This is because the end flag that turns the fill of is the first pixel
-	// after the actually drawn edge.
-	r.BufferWidth = width + 1
-
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*height)
-	r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*height*SUBPIXEL_COUNT)
-	r.ClipBound = clip(0, 0, width, height, SUBPIXEL_COUNT)
-	return &r
-}
-
-func clip(x, y, width, height, scale int) [4]float64 {
-	var clipBound [4]float64
-
-	offset := 0.99 / float64(scale)
-
-	clipBound[0] = float64(x) + offset
-	clipBound[2] = float64(x+width) - offset
-
-	clipBound[1] = float64(y * scale)
-	clipBound[3] = float64((y + height) * scale)
-	return clipBound
-}
-
-func intersect(r1, r2 [4]float64) [4]float64 {
-	if r1[0] < r2[0] {
-		r1[0] = r2[0]
-	}
-	if r1[2] > r2[2] {
-		r1[2] = r2[2]
-	}
-	if r1[0] > r1[2] {
-		r1[0] = r1[2]
-	}
-
-	if r1[1] < r2[1] {
-		r1[1] = r2[1]
-	}
-	if r1[3] > r2[3] {
-		r1[3] = r2[3]
-	}
-	if r1[1] > r1[3] {
-		r1[1] = r1[3]
-	}
-	return r1
-}
-
-func (r *Rasterizer8BitsSample) RenderEvenOdd(img *image.RGBA, color *color.RGBA, polygon *Polygon, tr [6]float64) {
-	// memset 0 the mask buffer
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
-
-	// inline matrix multiplication
-	transform := [6]float64{
-		tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
-		tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
-		tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
-		tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
-		tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
-		tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
-	}
-
-	clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
-	clipRect = intersect(clipRect, r.ClipBound)
-	p := 0
-	l := len(*polygon) / 2
-	var edges [32]PolygonEdge
-	for p < l {
-		edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
-		for k := 0; k < edgeCount; k++ {
-			r.addEvenOddEdge(&edges[k])
-		}
-		p += 16
-	}
-
-	r.fillEvenOdd(img, color, clipRect)
-}
-
-//! Adds an edge to be used with even-odd fill.
-func (r *Rasterizer8BitsSample) addEvenOddEdge(edge *PolygonEdge) {
-	x := Fix(edge.X * FIXED_FLOAT_COEF)
-	slope := Fix(edge.Slope * FIXED_FLOAT_COEF)
-	slopeFix := Fix(0)
-	if edge.LastLine-edge.FirstLine >= SLOPE_FIX_STEP {
-		slopeFix = Fix(edge.Slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) - slope<<SLOPE_FIX_SHIFT
-	}
-
-	var mask SUBPIXEL_DATA
-	var ySub uint32
-	var xp, yLine int
-	for y := edge.FirstLine; y <= edge.LastLine; y++ {
-		ySub = uint32(y & (SUBPIXEL_COUNT - 1))
-		xp = int((x + SUBPIXEL_OFFSETS[ySub]) >> FIXED_SHIFT)
-		mask = SUBPIXEL_DATA(1 << ySub)
-		yLine = y >> SUBPIXEL_SHIFT
-		r.MaskBuffer[yLine*r.BufferWidth+xp] ^= mask
-		x += slope
-		if y&SLOPE_FIX_MASK == 0 {
-			x += slopeFix
-		}
-	}
-}
-
-//! Adds an edge to be used with non-zero winding fill.
-func (r *Rasterizer8BitsSample) addNonZeroEdge(edge *PolygonEdge) {
-	x := Fix(edge.X * FIXED_FLOAT_COEF)
-	slope := Fix(edge.Slope * FIXED_FLOAT_COEF)
-	slopeFix := Fix(0)
-	if edge.LastLine-edge.FirstLine >= SLOPE_FIX_STEP {
-		slopeFix = Fix(edge.Slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) - slope<<SLOPE_FIX_SHIFT
-	}
-	var mask SUBPIXEL_DATA
-	var ySub uint32
-	var xp, yLine int
-	winding := NON_ZERO_MASK_DATA_UNIT(edge.Winding)
-	for y := edge.FirstLine; y <= edge.LastLine; y++ {
-		ySub = uint32(y & (SUBPIXEL_COUNT - 1))
-		xp = int((x + SUBPIXEL_OFFSETS[ySub]) >> FIXED_SHIFT)
-		mask = SUBPIXEL_DATA(1 << ySub)
-		yLine = y >> SUBPIXEL_SHIFT
-		r.MaskBuffer[yLine*r.BufferWidth+xp] |= mask
-		r.WindingBuffer[(yLine*r.BufferWidth+xp)*SUBPIXEL_COUNT+int(ySub)] += winding
-		x += slope
-		if y&SLOPE_FIX_MASK == 0 {
-			x += slopeFix
-		}
-	}
-}
-
-// Renders the mask to the canvas with even-odd fill.
-func (r *Rasterizer8BitsSample) fillEvenOdd(img *image.RGBA, color *color.RGBA, clipBound [4]float64) {
-	var x, y uint32
-
-	minX := uint32(clipBound[0])
-	maxX := uint32(clipBound[2])
-
-	minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
-	maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
-
-	//pixColor :=  (uint32(color.R) << 24) |  (uint32(color.G) << 16) |  (uint32(color.B) << 8) | uint32(color.A)
-	pixColor := (*uint32)(unsafe.Pointer(color))
-	cs1 := *pixColor & 0xff00ff
-	cs2 := *pixColor >> 8 & 0xff00ff
-
-	stride := uint32(img.Stride)
-	var mask SUBPIXEL_DATA
-
-	for y = minY; y < maxY; y++ {
-		tp := img.Pix[y*stride:]
-
-		mask = 0
-		for x = minX; x <= maxX; x++ {
-			p := (*uint32)(unsafe.Pointer(&tp[x]))
-			mask ^= r.MaskBuffer[y*uint32(r.BufferWidth)+x]
-			// 8bits
-			//alpha := uint32(coverageTable[mask])
-			// 16bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
-			// 32bits
-			alpha := uint32(coverageTable[mask&0xff] + coverageTable[mask>>8&0xff] + coverageTable[mask>>16&0xff] + coverageTable[mask>>24&0xff])
-
-			// alpha is in range of 0 to SUBPIXEL_COUNT
-			invAlpha := uint32(SUBPIXEL_COUNT) - alpha
-
-			ct1 := *p & 0xff00ff * invAlpha
-			ct2 := *p >> 8 & 0xff00ff * invAlpha
-
-			ct1 = (ct1 + cs1*alpha) >> SUBPIXEL_SHIFT & 0xff00ff
-			ct2 = (ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT) & 0xff00ff00
-
-			*p = ct1 + ct2
-		}
-	}
-}
-
-/*
- * Renders the polygon with non-zero winding fill.
- *  param aTarget the target bitmap.
- *  param aPolygon the polygon to render.
- *  param aColor the color to be used for rendering.
- *  param aTransformation the transformation matrix.
- */
-func (r *Rasterizer8BitsSample) RenderNonZeroWinding(img *image.RGBA, color *color.RGBA, polygon *Polygon, tr [6]float64) {
-
-	r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
-	r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*r.Height*SUBPIXEL_COUNT)
-
-	// inline matrix multiplication
-	transform := [6]float64{
-		tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
-		tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
-		tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
-		tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
-		tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
-		tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
-	}
-
-	clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
-	clipRect = intersect(clipRect, r.ClipBound)
-
-	p := 0
-	l := len(*polygon) / 2
-	var edges [32]PolygonEdge
-	for p < l {
-		edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
-		for k := 0; k < edgeCount; k++ {
-			r.addNonZeroEdge(&edges[k])
-		}
-		p += 16
-	}
-
-	r.fillNonZero(img, color, clipRect)
-}
-
-//! Renders the mask to the canvas with non-zero winding fill.
-func (r *Rasterizer8BitsSample) fillNonZero(img *image.RGBA, color *color.RGBA, clipBound [4]float64) {
-	var x, y uint32
-
-	minX := uint32(clipBound[0])
-	maxX := uint32(clipBound[2])
-
-	minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
-	maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
-
-	//pixColor :=  (uint32(color.R) << 24) |  (uint32(color.G) << 16) |  (uint32(color.B) << 8) | uint32(color.A)
-	pixColor := (*uint32)(unsafe.Pointer(color))
-	cs1 := *pixColor & 0xff00ff
-	cs2 := *pixColor >> 8 & 0xff00ff
-
-	stride := uint32(img.Stride)
-	var mask SUBPIXEL_DATA
-	var n uint32
-	var values [SUBPIXEL_COUNT]NON_ZERO_MASK_DATA_UNIT
-	for n = 0; n < SUBPIXEL_COUNT; n++ {
-		values[n] = 0
-	}
-
-	for y = minY; y < maxY; y++ {
-		tp := img.Pix[y*stride:]
-
-		mask = 0
-		for x = minX; x <= maxX; x++ {
-			p := (*uint32)(unsafe.Pointer(&tp[x]))
-			temp := r.MaskBuffer[y*uint32(r.BufferWidth)+x]
-			if temp != 0 {
-				var bit SUBPIXEL_DATA = 1
-				for n = 0; n < SUBPIXEL_COUNT; n++ {
-					if temp&bit != 0 {
-						t := values[n]
-						values[n] += r.WindingBuffer[(y*uint32(r.BufferWidth)+x)*SUBPIXEL_COUNT+n]
-						if (t == 0 || values[n] == 0) && t != values[n] {
-							mask ^= bit
-						}
-					}
-					bit <<= 1
-				}
-			}
-
-			// 8bits
-			//alpha := uint32(coverageTable[mask])
-			// 16bits
-			//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
-			// 32bits
-			alpha := uint32(coverageTable[mask&0xff] + coverageTable[mask>>8&0xff] + coverageTable[mask>>16&0xff] + coverageTable[mask>>24&0xff])
-
-			// alpha is in range of 0 to SUBPIXEL_COUNT
-			invAlpha := uint32(SUBPIXEL_COUNT) - alpha
-
-			ct1 := *p & 0xff00ff * invAlpha
-			ct2 := *p >> 8 & 0xff00ff * invAlpha
-
-			ct1 = (ct1 + cs1*alpha) >> SUBPIXEL_SHIFT & 0xff00ff
-			ct2 = (ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT) & 0xff00ff00
-
-			*p = ct1 + ct2
-		}
-	}
-}

raster/fixed_point.go

@@ -1,17 +0,0 @@
-package raster
-
-type Fix int32
-
-const (
-	FIXED_SHIFT      = 16
-	FIXED_FLOAT_COEF = 1 << FIXED_SHIFT
-)
-
-/*! Fixed point math inevitably introduces rounding error to the DDA. The error is
- *  fixed every now and then by a separate fix value. The defines below set these.
- */
-const (
-	SLOPE_FIX_SHIFT = 8
-	SLOPE_FIX_STEP  = 1 << SLOPE_FIX_SHIFT
-	SLOPE_FIX_MASK  = SLOPE_FIX_STEP - 1
-)

raster/polygon.go

@@ -1,581 +0,0 @@
-// Copyright 2011 The draw2d Authors. All rights reserved.
-// created: 27/05/2011 by Laurent Le Goff
-package raster
-
-const (
-	POLYGON_CLIP_NONE = iota
-	POLYGON_CLIP_LEFT
-	POLYGON_CLIP_RIGHT
-	POLYGON_CLIP_TOP
-	POLYGON_CLIP_BOTTOM
-)
-
-type Polygon []float64
-
-type PolygonEdge struct {
-	X, Slope            float64
-	FirstLine, LastLine int
-	Winding             int16
-}
-
-//! A more optimized representation of a polygon edge.
-type PolygonScanEdge struct {
-	FirstLine, LastLine int
-	Winding             int16
-	X                   Fix
-	Slope               Fix
-	SlopeFix            Fix
-	NextEdge            *PolygonScanEdge
-}
-
-//! Calculates the edges of the polygon with transformation and clipping to edges array.
-/*! \param startIndex the index for the first vertex.
- *  \param vertexCount the amount of vertices to convert.
- *  \param edges the array for result edges. This should be able to contain 2*aVertexCount edges.
- *  \param tr the transformation matrix for the polygon.
- *  \param aClipRectangle the clip rectangle.
- *  \return the amount of edges in the result.
- */
-func (p Polygon) getEdges(startIndex, vertexCount int, edges []PolygonEdge, tr [6]float64, clipBound [4]float64) int {
-	startIndex = startIndex * 2
-	endIndex := startIndex + vertexCount*2
-	if endIndex > len(p) {
-		endIndex = len(p)
-	}
-
-	x := p[startIndex]
-	y := p[startIndex+1]
-	// inline transformation
-	prevX := x*tr[0] + y*tr[2] + tr[4]
-	prevY := x*tr[1] + y*tr[3] + tr[5]
-
-	//! Calculates the clip flags for a point.
-	prevClipFlags := POLYGON_CLIP_NONE
-	if prevX < clipBound[0] {
-		prevClipFlags |= POLYGON_CLIP_LEFT
-	} else if prevX >= clipBound[2] {
-		prevClipFlags |= POLYGON_CLIP_RIGHT
-	}
-
-	if prevY < clipBound[1] {
-		prevClipFlags |= POLYGON_CLIP_TOP
-	} else if prevY >= clipBound[3] {
-		prevClipFlags |= POLYGON_CLIP_BOTTOM
-	}
-
-	edgeCount := 0
-	var k, clipFlags, clipSum, clipUnion int
-	var xleft, yleft, xright, yright, oldY, maxX, minX float64
-	var swapWinding int16
-	for n := startIndex; n < endIndex; n = n + 2 {
-		k = (n + 2) % len(p)
-		x = p[k]*tr[0] + p[k+1]*tr[2] + tr[4]
-		y = p[k]*tr[1] + p[k+1]*tr[3] + tr[5]
-
-		//! Calculates the clip flags for a point.
-		clipFlags = POLYGON_CLIP_NONE
-		if prevX < clipBound[0] {
-			clipFlags |= POLYGON_CLIP_LEFT
-		} else if prevX >= clipBound[2] {
-			clipFlags |= POLYGON_CLIP_RIGHT
-		}
-		if prevY < clipBound[1] {
-			clipFlags |= POLYGON_CLIP_TOP
-		} else if prevY >= clipBound[3] {
-			clipFlags |= POLYGON_CLIP_BOTTOM
-		}
-
-		clipSum = prevClipFlags | clipFlags
-		clipUnion = prevClipFlags & clipFlags
-
-		// Skip all edges that are either completely outside at the top or at the bottom.
-		if clipUnion&(POLYGON_CLIP_TOP|POLYGON_CLIP_BOTTOM) == 0 {
-			if clipUnion&POLYGON_CLIP_RIGHT != 0 {
-				// Both clip to right, edge is a vertical line on the right side
-				if getVerticalEdge(prevY, y, clipBound[2], &edges[edgeCount], clipBound) {
-					edgeCount++
-				}
-			} else if clipUnion&POLYGON_CLIP_LEFT != 0 {
-				// Both clip to left, edge is a vertical line on the left side
-				if getVerticalEdge(prevY, y, clipBound[0], &edges[edgeCount], clipBound) {
-					edgeCount++
-				}
-			} else if clipSum&(POLYGON_CLIP_RIGHT|POLYGON_CLIP_LEFT) == 0 {
-				// No clipping in the horizontal direction
-				if getEdge(prevX, prevY, x, y, &edges[edgeCount], clipBound) {
-					edgeCount++
-				}
-			} else {
-				// Clips to left or right or both.
-
-				if x < prevX {
-					xleft, yleft = x, y
-					xright, yright = prevX, prevY
-					swapWinding = -1
-				} else {
-					xleft, yleft = prevX, prevY
-					xright, yright = x, y
-					swapWinding = 1
-				}
-
-				slope := (yright - yleft) / (xright - xleft)
-
-				if clipSum&POLYGON_CLIP_RIGHT != 0 {
-					// calculate new position for the right vertex
-					oldY = yright
-					maxX = clipBound[2]
-
-					yright = yleft + (maxX-xleft)*slope
-					xright = maxX
-
-					// add vertical edge for the overflowing part
-					if getVerticalEdge(yright, oldY, maxX, &edges[edgeCount], clipBound) {
-						edges[edgeCount].Winding *= swapWinding
-						edgeCount++
-					}
-				}
-
-				if clipSum&POLYGON_CLIP_LEFT != 0 {
-					// calculate new position for the left vertex
-					oldY = yleft
-					minX = clipBound[0]
-
-					yleft = yleft + (minX-xleft)*slope
-					xleft = minX
-
-					// add vertical edge for the overflowing part
-					if getVerticalEdge(oldY, yleft, minX, &edges[edgeCount], clipBound) {
-						edges[edgeCount].Winding *= swapWinding
-						edgeCount++
-					}
-				}
-
-				if getEdge(xleft, yleft, xright, yright, &edges[edgeCount], clipBound) {
-					edges[edgeCount].Winding *= swapWinding
-					edgeCount++
-				}
-			}
-		}
-
-		prevClipFlags = clipFlags
-		prevX = x
-		prevY = y
-	}
-
-	return edgeCount
-}
-
-//! Creates a polygon edge between two vectors.
-/*! Clips the edge vertically to the clip rectangle. Returns true for edges that
- *  should be rendered, false for others.
- */
-func getEdge(x0, y0, x1, y1 float64, edge *PolygonEdge, clipBound [4]float64) bool {
-	var startX, startY, endX, endY float64
-	var winding int16
-
-	if y0 <= y1 {
-		startX = x0
-		startY = y0
-		endX = x1
-		endY = y1
-		winding = 1
-	} else {
-		startX = x1
-		startY = y1
-		endX = x0
-		endY = y0
-		winding = -1
-	}
-
-	// Essentially, firstLine is floor(startY + 1) and lastLine is floor(endY).
-	// These are refactored to integer casts in order to avoid function
-	// calls. The difference with integer cast is that numbers are always
-	// rounded towards zero. Since values smaller than zero get clipped away,
-	// only coordinates between 0 and -1 require greater attention as they
-	// also round to zero. The problems in this range can be avoided by
-	// adding one to the values before conversion and subtracting after it.
-
-	firstLine := int(startY + 1)
-	lastLine := int(endY+1) - 1
-
-	minClip := int(clipBound[1])
-	maxClip := int(clipBound[3])
-
-	// If start and end are on the same line, the edge doesn't cross
-	// any lines and thus can be ignored.
-	// If the end is smaller than the first line, edge is out.
-	// If the start is larger than the last line, edge is out.
-	if firstLine > lastLine || lastLine < minClip || firstLine >= maxClip {
-		return false
-	}
-
-	// Adjust the start based on the target.
-	if firstLine < minClip {
-		firstLine = minClip
-	}
-
-	if lastLine >= maxClip {
-		lastLine = maxClip - 1
-	}
-	edge.Slope = (endX - startX) / (endY - startY)
-	edge.X = startX + (float64(firstLine)-startY)*edge.Slope
-	edge.Winding = winding
-	edge.FirstLine = firstLine
-	edge.LastLine = lastLine
-
-	return true
-}
-
-//! Creates a vertical polygon edge between two y values.
-/*! Clips the edge vertically to the clip rectangle. Returns true for edges that
- *  should be rendered, false for others.
- */
-func getVerticalEdge(startY, endY, x float64, edge *PolygonEdge, clipBound [4]float64) bool {
-	var start, end float64
-	var winding int16
-	if startY < endY {
-		start = startY
-		end = endY
-		winding = 1
-	} else {
-		start = endY
-		end = startY
-		winding = -1
-	}
-
-	firstLine := int(start + 1)
-	lastLine := int(end+1) - 1
-
-	minClip := int(clipBound[1])
-	maxClip := int(clipBound[3])
-
-	// If start and end are on the same line, the edge doesn't cross
-	// any lines and thus can be ignored.
-	// If the end is smaller than the first line, edge is out.
-	// If the start is larger than the last line, edge is out.
-	if firstLine > lastLine || lastLine < minClip || firstLine >= maxClip {
-		return false
-	}
-
-	// Adjust the start based on the clip rect.
-	if firstLine < minClip {
-		firstLine = minClip
-	}
-	if lastLine >= maxClip {
-		lastLine = maxClip - 1
-	}
-
-	edge.Slope = 0
-	edge.X = x
-	edge.Winding = winding
-	edge.FirstLine = firstLine
-	edge.LastLine = lastLine
-
-	return true
-}
-
-type VertexData struct {
-	X, Y      float64
-	ClipFlags int
-	Line      int
-}
-
-//! Calculates the edges of the polygon with transformation and clipping to edges array.
-/*! Note that this may return upto three times the amount of edges that the polygon has vertices,
- *  in the unlucky case where both left and right side get clipped for all edges.
- *  \param edges the array for result edges. This should be able to contain 2*aVertexCount edges.
- *  \param aTransformation the transformation matrix for the polygon.
- *  \param aClipRectangle the clip rectangle.
- *  \return the amount of edges in the result.
- */
-func (p Polygon) getScanEdges(edges []PolygonScanEdge, tr [6]float64, clipBound [4]float64) int {
-	var n int
-	vertexData := make([]VertexData, len(p)/2+1)
-	for n = 0; n < len(vertexData)-1; n = n + 1 {
-		k := n * 2
-		vertexData[n].X = p[k]*tr[0] + p[k+1]*tr[2] + tr[4]
-		vertexData[n].Y = p[k]*tr[1] + p[k+1]*tr[3] + tr[5]
-		// Calculate clip flags for all vertices.
-		vertexData[n].ClipFlags = POLYGON_CLIP_NONE
-		if vertexData[n].X < clipBound[0] {
-			vertexData[n].ClipFlags |= POLYGON_CLIP_LEFT
-		} else if vertexData[n].X >= clipBound[2] {
-			vertexData[n].ClipFlags |= POLYGON_CLIP_RIGHT
-		}
-		if vertexData[n].Y < clipBound[1] {
-			vertexData[n].ClipFlags |= POLYGON_CLIP_TOP
-		} else if vertexData[n].Y >= clipBound[3] {
-			vertexData[n].ClipFlags |= POLYGON_CLIP_BOTTOM
-		}
-
-		// Calculate line of the vertex. If the vertex is clipped by top or bottom, the line
-		// is determined by the clip rectangle.
-		if vertexData[n].ClipFlags&POLYGON_CLIP_TOP != 0 {
-			vertexData[n].Line = int(clipBound[1])
-		} else if vertexData[n].ClipFlags&POLYGON_CLIP_BOTTOM != 0 {
-			vertexData[n].Line = int(clipBound[3] - 1)
-		} else {
-			vertexData[n].Line = int(vertexData[n].Y+1) - 1
-		}
-	}
-
-	// Copy the data from 0 to the last entry to make the data to loop.
-	vertexData[len(vertexData)-1] = vertexData[0]
-
-	// Transform the first vertex; store.
-	// Process mVertexCount - 1 times, next is n+1
-	// copy the first vertex to
-	// Process 1 time, next is n
-
-	edgeCount := 0
-	for n = 0; n < len(vertexData)-1; n++ {
-		clipSum := vertexData[n].ClipFlags | vertexData[n+1].ClipFlags
-		clipUnion := vertexData[n].ClipFlags & vertexData[n+1].ClipFlags
-
-		if clipUnion&(POLYGON_CLIP_TOP|POLYGON_CLIP_BOTTOM) == 0 &&
-			vertexData[n].Line != vertexData[n+1].Line {
-			var startIndex, endIndex int
-			var winding int16
-			if vertexData[n].Y < vertexData[n+1].Y {
-				startIndex = n
-				endIndex = n + 1
-				winding = 1
-			} else {
-				startIndex = n + 1
-				endIndex = n
-				winding = -1
-			}
-
-			firstLine := vertexData[startIndex].Line + 1
-			lastLine := vertexData[endIndex].Line
-
-			if clipUnion&POLYGON_CLIP_RIGHT != 0 {
-				// Both clip to right, edge is a vertical line on the right side
-				edges[edgeCount].FirstLine = firstLine
-				edges[edgeCount].LastLine = lastLine
-				edges[edgeCount].Winding = winding
-				edges[edgeCount].X = Fix(clipBound[2] * FIXED_FLOAT_COEF)
-				edges[edgeCount].Slope = 0
-				edges[edgeCount].SlopeFix = 0
-
-				edgeCount++
-			} else if clipUnion&POLYGON_CLIP_LEFT != 0 {
-				// Both clip to left, edge is a vertical line on the left side
-				edges[edgeCount].FirstLine = firstLine
-				edges[edgeCount].LastLine = lastLine
-				edges[edgeCount].Winding = winding
-				edges[edgeCount].X = Fix(clipBound[0] * FIXED_FLOAT_COEF)
-				edges[edgeCount].Slope = 0
-				edges[edgeCount].SlopeFix = 0
-
-				edgeCount++
-			} else if clipSum&(POLYGON_CLIP_RIGHT|POLYGON_CLIP_LEFT) == 0 {
-				// No clipping in the horizontal direction
-				slope := (vertexData[endIndex].X -
-					vertexData[startIndex].X) /
-					(vertexData[endIndex].Y -
-						vertexData[startIndex].Y)
-
-					// If there is vertical clip (for the top) it will be processed here. The calculation
-					// should be done for all non-clipping edges as well to determine the accurate position
-					// where the edge crosses the first scanline.
-				startx := vertexData[startIndex].X +
-					(float64(firstLine)-vertexData[startIndex].Y)*slope
-
-				edges[edgeCount].FirstLine = firstLine
-				edges[edgeCount].LastLine = lastLine
-				edges[edgeCount].Winding = winding
-				edges[edgeCount].X = Fix(startx * FIXED_FLOAT_COEF)
-				edges[edgeCount].Slope = Fix(slope * FIXED_FLOAT_COEF)
-
-				if lastLine-firstLine >= SLOPE_FIX_STEP {
-					edges[edgeCount].SlopeFix = Fix(slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) -
-						edges[edgeCount].Slope<<SLOPE_FIX_SHIFT
-				} else {
-					edges[edgeCount].SlopeFix = 0
-				}
-
-				edgeCount++
-			} else {
-				// Clips to left or right or both.
-				slope := (vertexData[endIndex].X -
-					vertexData[startIndex].X) /
-					(vertexData[endIndex].Y -
-						vertexData[startIndex].Y)
-
-				// The edge may clip to both left and right.
-				// The clip results in one or two new vertices, and one to three segments.
-				// The rounding for scanlines may produce a result where any of the segments is
-				// ignored.
-
-				// The start is always above the end. Calculate the clip positions to clipVertices.
-				// It is possible that only one of the vertices exist. This will be detected from the
-				// clip flags of the vertex later, so they are initialized here.
-				var clipVertices [2]VertexData
-
-				if vertexData[startIndex].X <
-					vertexData[endIndex].X {
-					clipVertices[0].X = clipBound[0]
-					clipVertices[1].X = clipBound[2]
-					clipVertices[0].ClipFlags = POLYGON_CLIP_LEFT
-					clipVertices[1].ClipFlags = POLYGON_CLIP_RIGHT
-				} else {
-					clipVertices[0].X = clipBound[2]
-					clipVertices[1].X = clipBound[0]
-					clipVertices[0].ClipFlags = POLYGON_CLIP_RIGHT
-					clipVertices[1].ClipFlags = POLYGON_CLIP_LEFT
-				}
-
-				var p int
-				for p = 0; p < 2; p++ {
-					// Check if either of the vertices crosses the edge marked for the clip vertex
-					if clipSum&clipVertices[p].ClipFlags != 0 {
-						// The the vertex is required, calculate it.
-						clipVertices[p].Y = vertexData[startIndex].Y +
-							(clipVertices[p].X-
-								vertexData[startIndex].X)/slope
-
-						// If there is clipping in the vertical direction, the new vertex may be clipped.
-						if clipSum&(POLYGON_CLIP_TOP|POLYGON_CLIP_BOTTOM) != 0 {
-							if clipVertices[p].Y < clipBound[1] {
-								clipVertices[p].ClipFlags = POLYGON_CLIP_TOP
-								clipVertices[p].Line = int(clipBound[1])
-							} else if clipVertices[p].Y > clipBound[3] {
-								clipVertices[p].ClipFlags = POLYGON_CLIP_BOTTOM
-								clipVertices[p].Line = int(clipBound[3] - 1)
-							} else {
-								clipVertices[p].ClipFlags = 0
-								clipVertices[p].Line = int(clipVertices[p].Y+1) - 1
-							}
-						} else {
-							clipVertices[p].ClipFlags = 0
-							clipVertices[p].Line = int(clipVertices[p].Y+1) - 1
-						}
-					}
-				}
-
-				// Now there are three or four vertices, in the top-to-bottom order of start, clip0, clip1,
-				// end. What kind of edges are required for connecting these can be determined from the
-				// clip flags.
-				// -if clip vertex has horizontal clip flags, it doesn't exist. No edge is generated.
-				// -if start vertex or end vertex has horizontal clip flag, the edge to/from the clip vertex is vertical
-				// -if the line of two vertices is the same, the edge is not generated, since the edge doesn't
-				//  cross any scanlines.
-
-				// The alternative patterns are:
-				// start - clip0 - clip1 - end
-				// start - clip0 - end
-				// start - clip1 - end
-
-				var topClipIndex, bottomClipIndex int
-				if (clipVertices[0].ClipFlags|clipVertices[1].ClipFlags)&
-					(POLYGON_CLIP_LEFT|POLYGON_CLIP_RIGHT) == 0 {
-					// Both sides are clipped, the order is start-clip0-clip1-end
-					topClipIndex = 0
-					bottomClipIndex = 1
-
-					// Add the edge from clip0 to clip1
-					// Check that the line is different for the vertices.
-					if clipVertices[0].Line != clipVertices[1].Line {
-						firstClipLine := clipVertices[0].Line + 1
-
-						startx := vertexData[startIndex].X +
-							(float64(firstClipLine)-vertexData[startIndex].Y)*slope
-
-						edges[edgeCount].X = Fix(startx * FIXED_FLOAT_COEF)
-						edges[edgeCount].Slope = Fix(slope * FIXED_FLOAT_COEF)
-						edges[edgeCount].FirstLine = firstClipLine
-						edges[edgeCount].LastLine = clipVertices[1].Line
-						edges[edgeCount].Winding = winding
-
-						if edges[edgeCount].LastLine-edges[edgeCount].FirstLine >= SLOPE_FIX_STEP {
-							edges[edgeCount].SlopeFix = Fix(slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) -
-								edges[edgeCount].Slope<<SLOPE_FIX_SHIFT
-						} else {
-							edges[edgeCount].SlopeFix = 0
-						}
-
-						edgeCount++
-					}
-				} else {
-					// Clip at either side, check which side. The clip flag is on for the vertex
-					// that doesn't exist, i.e. has not been clipped to be inside the rect.
-					if clipVertices[0].ClipFlags&(POLYGON_CLIP_LEFT|POLYGON_CLIP_RIGHT) != 0 {
-						topClipIndex = 1
-						bottomClipIndex = 1
-					} else {
-						topClipIndex = 0
-						bottomClipIndex = 0
-					}
-				}
-
-				// Generate the edges from start - clip top and clip bottom - end
-				// Clip top and clip bottom may be the same vertex if there is only one
-				// clipped vertex.
-
-				// Check that the line is different for the vertices.
-				if vertexData[startIndex].Line != clipVertices[topClipIndex].Line {
-					edges[edgeCount].FirstLine = firstLine
-					edges[edgeCount].LastLine = clipVertices[topClipIndex].Line
-					edges[edgeCount].Winding = winding
-
-					// If startIndex is clipped, the edge is a vertical one.
-					if vertexData[startIndex].ClipFlags&(POLYGON_CLIP_LEFT|POLYGON_CLIP_RIGHT) != 0 {
-						edges[edgeCount].X = Fix(clipVertices[topClipIndex].X * FIXED_FLOAT_COEF)
-						edges[edgeCount].Slope = 0
-						edges[edgeCount].SlopeFix = 0
-					} else {
-						startx := vertexData[startIndex].X +
-							(float64(firstLine)-vertexData[startIndex].Y)*slope
-
-						edges[edgeCount].X = Fix(startx * FIXED_FLOAT_COEF)
-						edges[edgeCount].Slope = Fix(slope * FIXED_FLOAT_COEF)
-
-						if edges[edgeCount].LastLine-edges[edgeCount].FirstLine >= SLOPE_FIX_STEP {
-							edges[edgeCount].SlopeFix = Fix(slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) -
-								edges[edgeCount].Slope<<SLOPE_FIX_SHIFT
-						} else {
-							edges[edgeCount].SlopeFix = 0
-						}
-					}
-
-					edgeCount++
-				}
-
-				// Check that the line is different for the vertices.
-				if clipVertices[bottomClipIndex].Line != vertexData[endIndex].Line {
-					firstClipLine := clipVertices[bottomClipIndex].Line + 1
-
-					edges[edgeCount].FirstLine = firstClipLine
-					edges[edgeCount].LastLine = lastLine
-					edges[edgeCount].Winding = winding
-
-					// If endIndex is clipped, the edge is a vertical one.
-					if vertexData[endIndex].ClipFlags&(POLYGON_CLIP_LEFT|POLYGON_CLIP_RIGHT) != 0 {
-						edges[edgeCount].X = Fix(clipVertices[bottomClipIndex].X * FIXED_FLOAT_COEF)
-						edges[edgeCount].Slope = 0
-						edges[edgeCount].SlopeFix = 0
-					} else {
-						startx := vertexData[startIndex].X +
-							(float64(firstClipLine)-vertexData[startIndex].Y)*slope
-
-						edges[edgeCount].X = Fix(startx * FIXED_FLOAT_COEF)
-						edges[edgeCount].Slope = Fix(slope * FIXED_FLOAT_COEF)
-
-						if edges[edgeCount].LastLine-edges[edgeCount].FirstLine >= SLOPE_FIX_STEP {
-							edges[edgeCount].SlopeFix = Fix(slope*SLOPE_FIX_STEP*FIXED_FLOAT_COEF) -
-								edges[edgeCount].Slope<<SLOPE_FIX_SHIFT
-						} else {
-							edges[edgeCount].SlopeFix = 0
-						}
-					}
-
-					edgeCount++
-				}
-
-			}
-		}
-	}
-
-	return edgeCount
-}

raster/raster_test.go

@@ -1,218 +0,0 @@
-package raster
-
-import (
-	"bufio"
-	"image"
-	"image/color"
-	"image/png"
-	"log"
-	"os"
-	"testing"
-
-	"code.google.com/p/freetype-go/freetype/raster"
-	"gopkg.in/llgcode/draw2d.v1/curve"
-)
-
-var flatteningThreshold = 0.5
-
-func savepng(filePath string, m image.Image) {
-	f, err := os.Create(filePath)
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-	defer f.Close()
-	b := bufio.NewWriter(f)
-	err = png.Encode(b, m)
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-	err = b.Flush()
-	if err != nil {
-		log.Println(err)
-		os.Exit(1)
-	}
-}
-
-type Path struct {
-	points []float64
-}
-
-func (p *Path) LineTo(x, y float64) {
-	if len(p.points)+2 > cap(p.points) {
-		points := make([]float64, len(p.points)+2, len(p.points)+32)
-		copy(points, p.points)
-		p.points = points
-	} else {
-		p.points = p.points[0 : len(p.points)+2]
-	}
-	p.points[len(p.points)-2] = x
-	p.points[len(p.points)-1] = y
-}
-
-func TestFreetype(t *testing.T) {
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-
-	img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-	rasterizer := raster.NewRasterizer(200, 200)
-	rasterizer.UseNonZeroWinding = false
-	rasterizer.Start(raster.Point{
-		X: raster.Fix32(10 * 256),
-		Y: raster.Fix32(190 * 256)})
-	for j := 0; j < len(poly); j = j + 2 {
-		rasterizer.Add1(raster.Point{
-			X: raster.Fix32(poly[j] * 256),
-			Y: raster.Fix32(poly[j+1] * 256)})
-	}
-	painter := raster.NewRGBAPainter(img)
-	painter.SetColor(color)
-	rasterizer.Rasterize(painter)
-
-	savepng("../output/raster/TestFreetype.png", img)
-}
-
-func TestFreetypeNonZeroWinding(t *testing.T) {
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-
-	img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-	rasterizer := raster.NewRasterizer(200, 200)
-	rasterizer.UseNonZeroWinding = true
-	rasterizer.Start(raster.Point{
-		X: raster.Fix32(10 * 256),
-		Y: raster.Fix32(190 * 256)})
-	for j := 0; j < len(poly); j = j + 2 {
-		rasterizer.Add1(raster.Point{
-			X: raster.Fix32(poly[j] * 256),
-			Y: raster.Fix32(poly[j+1] * 256)})
-	}
-	painter := raster.NewRGBAPainter(img)
-	painter.SetColor(color)
-	rasterizer.Rasterize(painter)
-
-	savepng("../output/raster/TestFreetypeNonZeroWinding.png", img)
-}
-
-func TestRasterizer(t *testing.T) {
-	img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-	tr := [6]float64{1, 0, 0, 1, 0, 0}
-	r := NewRasterizer8BitsSample(200, 200)
-	//PolylineBresenham(img, image.Black, poly...)
-
-	r.RenderEvenOdd(img, &color, &poly, tr)
-	savepng("../output/raster/TestRasterizer.png", img)
-}
-
-func TestRasterizerNonZeroWinding(t *testing.T) {
-	img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-	tr := [6]float64{1, 0, 0, 1, 0, 0}
-	r := NewRasterizer8BitsSample(200, 200)
-	//PolylineBresenham(img, image.Black, poly...)
-
-	r.RenderNonZeroWinding(img, &color, &poly, tr)
-	savepng("../output/raster/TestRasterizerNonZeroWinding.png", img)
-}
-
-func BenchmarkFreetype(b *testing.B) {
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-
-	for i := 0; i < b.N; i++ {
-		img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-		rasterizer := raster.NewRasterizer(200, 200)
-		rasterizer.UseNonZeroWinding = false
-		rasterizer.Start(raster.Point{
-			X: raster.Fix32(10 * 256),
-			Y: raster.Fix32(190 * 256)})
-		for j := 0; j < len(poly); j = j + 2 {
-			rasterizer.Add1(raster.Point{
-				X: raster.Fix32(poly[j] * 256),
-				Y: raster.Fix32(poly[j+1] * 256)})
-		}
-		painter := raster.NewRGBAPainter(img)
-		painter.SetColor(color)
-		rasterizer.Rasterize(painter)
-	}
-}
-
-func BenchmarkFreetypeNonZeroWinding(b *testing.B) {
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-
-	for i := 0; i < b.N; i++ {
-		img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-		rasterizer := raster.NewRasterizer(200, 200)
-		rasterizer.UseNonZeroWinding = true
-		rasterizer.Start(raster.Point{
-			X: raster.Fix32(10 * 256),
-			Y: raster.Fix32(190 * 256)})
-		for j := 0; j < len(poly); j = j + 2 {
-			rasterizer.Add1(raster.Point{
-				X: raster.Fix32(poly[j] * 256),
-				Y: raster.Fix32(poly[j+1] * 256)})
-		}
-		painter := raster.NewRGBAPainter(img)
-		painter.SetColor(color)
-		rasterizer.Rasterize(painter)
-	}
-}
-
-func BenchmarkRasterizerNonZeroWinding(b *testing.B) {
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-	tr := [6]float64{1, 0, 0, 1, 0, 0}
-	for i := 0; i < b.N; i++ {
-		img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-		rasterizer := NewRasterizer8BitsSample(200, 200)
-		rasterizer.RenderNonZeroWinding(img, &color, &poly, tr)
-	}
-}
-
-func BenchmarkRasterizer(b *testing.B) {
-	var p Path
-	p.LineTo(10, 190)
-	c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
-	c.Segment(&p, flatteningThreshold)
-	poly := Polygon(p.points)
-	color := color.RGBA{0, 0, 0, 0xff}
-	tr := [6]float64{1, 0, 0, 1, 0, 0}
-	for i := 0; i < b.N; i++ {
-		img := image.NewRGBA(image.Rect(0, 0, 200, 200))
-		rasterizer := NewRasterizer8BitsSample(200, 200)
-		rasterizer.RenderEvenOdd(img, &color, &poly, tr)
-	}
-}

rgba_interpolation.go

@@ -1,155 +0,0 @@
-// Copyright 2010 The draw2d Authors. All rights reserved.
-// created: 21/11/2010 by Laurent Le Goff
-// see http://pippin.gimp.org/image_processing/chap_resampling.html
-
-package draw2d
-
-import (
-	"image"
-	"image/color"
-	"image/draw"
-	"math"
-)
-
-// ImageFilter defines sampling filter (linear, bilinear or bicubic)
-type ImageFilter int
-
-const (
-	// LinearFilter uses linear interpolation
-	LinearFilter ImageFilter = iota
-	// BilinearFilter uses bilinear interpolation
-	BilinearFilter
-	// BicubicFilter uses bicubic interpolation
-	BicubicFilter
-)
-
-//see http://pippin.gimp.org/image_processing/chap_resampling.html
-func getColorLinear(img image.Image, x, y float64) color.Color {
-	return img.At(int(x), int(y))
-}
-
-func getColorBilinear(img image.Image, x, y float64) color.Color {
-	x0 := math.Floor(x)
-	y0 := math.Floor(y)
-	dx := x - x0
-	dy := y - y0
-
-	rt, gt, bt, at := img.At(int(x0), int(y0)).RGBA()
-	r0, g0, b0, a0 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = img.At(int(x0+1), int(y0)).RGBA()
-	r1, g1, b1, a1 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = img.At(int(x0+1), int(y0+1)).RGBA()
-	r2, g2, b2, a2 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = img.At(int(x0), int(y0+1)).RGBA()
-	r3, g3, b3, a3 := float64(rt), float64(gt), float64(bt), float64(at)
-
-	r := int(lerp(lerp(r0, r1, dx), lerp(r3, r2, dx), dy))
-	g := int(lerp(lerp(g0, g1, dx), lerp(g3, g2, dx), dy))
-	b := int(lerp(lerp(b0, b1, dx), lerp(b3, b2, dx), dy))
-	a := int(lerp(lerp(a0, a1, dx), lerp(a3, a2, dx), dy))
-	return color.RGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)}
-}
-
-/**
--- LERP
--- /lerp/, vi.,n.
---
--- Quasi-acronym for Linear Interpolation, used as a verb or noun for
--- the operation. "Bresenham's algorithm lerps incrementally between the
--- two endpoints of the line." (From Jargon File (4.4.4, 14 Aug 2003)
-*/
-func lerp(v1, v2, ratio float64) float64 {
-	return v1*(1-ratio) + v2*ratio
-}
-
-func getColorCubicRow(img image.Image, x, y, offset float64) color.Color {
-	c0 := img.At(int(x), int(y))
-	c1 := img.At(int(x+1), int(y))
-	c2 := img.At(int(x+2), int(y))
-	c3 := img.At(int(x+3), int(y))
-	rt, gt, bt, at := c0.RGBA()
-	r0, g0, b0, a0 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = c1.RGBA()
-	r1, g1, b1, a1 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = c2.RGBA()
-	r2, g2, b2, a2 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = c3.RGBA()
-	r3, g3, b3, a3 := float64(rt), float64(gt), float64(bt), float64(at)
-	r, g, b, a := cubic(offset, r0, r1, r2, r3), cubic(offset, g0, g1, g2, g3), cubic(offset, b0, b1, b2, b3), cubic(offset, a0, a1, a2, a3)
-	return color.RGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)}
-}
-
-func getColorBicubic(img image.Image, x, y float64) color.Color {
-	x0 := math.Floor(x)
-	y0 := math.Floor(y)
-	dx := x - x0
-	dy := y - y0
-	c0 := getColorCubicRow(img, x0-1, y0-1, dx)
-	c1 := getColorCubicRow(img, x0-1, y0, dx)
-	c2 := getColorCubicRow(img, x0-1, y0+1, dx)
-	c3 := getColorCubicRow(img, x0-1, y0+2, dx)
-	rt, gt, bt, at := c0.RGBA()
-	r0, g0, b0, a0 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = c1.RGBA()
-	r1, g1, b1, a1 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = c2.RGBA()
-	r2, g2, b2, a2 := float64(rt), float64(gt), float64(bt), float64(at)
-	rt, gt, bt, at = c3.RGBA()
-	r3, g3, b3, a3 := float64(rt), float64(gt), float64(bt), float64(at)
-	r, g, b, a := cubic(dy, r0, r1, r2, r3), cubic(dy, g0, g1, g2, g3), cubic(dy, b0, b1, b2, b3), cubic(dy, a0, a1, a2, a3)
-	return color.RGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)}
-}
-
-func cubic(offset, v0, v1, v2, v3 float64) uint32 {
-	// offset is the offset of the sampled value between v1 and v2
-	return uint32(((((-7*v0+21*v1-21*v2+7*v3)*offset+
-		(15*v0-36*v1+27*v2-6*v3))*offset+
-		(-9*v0+9*v2))*offset + (v0 + 16*v1 + v2)) / 18.0)
-}
-
-// DrawImage draws a source image on an destination image.
-func DrawImage(src image.Image, dest draw.Image, tr MatrixTransform, op draw.Op, filter ImageFilter) {
-	bounds := src.Bounds()
-	x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Max.X), float64(bounds.Max.Y)
-	tr.TransformRectangle(&x0, &y0, &x1, &y1)
-	var x, y, u, v float64
-	var c1, c2, cr color.Color
-	var r, g, b, a, ia, r1, g1, b1, a1, r2, g2, b2, a2 uint32
-	var color color.RGBA
-	for x = x0; x < x1; x++ {
-		for y = y0; y < y1; y++ {
-			u = x
-			v = y
-			tr.InverseTransform(&u, &v)
-			if bounds.Min.X <= int(u) && bounds.Max.X > int(u) && bounds.Min.Y <= int(v) && bounds.Max.Y > int(v) {
-				c1 = dest.At(int(x), int(y))
-				switch filter {
-				case LinearFilter:
-					c2 = src.At(int(u), int(v))
-				case BilinearFilter:
-					c2 = getColorBilinear(src, u, v)
-				case BicubicFilter:
-					c2 = getColorBicubic(src, u, v)
-				}
-				switch op {
-				case draw.Over:
-					r1, g1, b1, a1 = c1.RGBA()
-					r2, g2, b2, a2 = c2.RGBA()
-					ia = M - a2
-					r = ((r1 * ia) / M) + r2
-					g = ((g1 * ia) / M) + g2
-					b = ((b1 * ia) / M) + b2
-					a = ((a1 * ia) / M) + a2
-					color.R = uint8(r >> 8)
-					color.G = uint8(g >> 8)
-					color.B = uint8(b >> 8)
-					color.A = uint8(a >> 8)
-					cr = color
-				default:
-					cr = c2
-				}
-				dest.Set(int(x), int(y), cr)
-			}
-		}
-	}
-}

samples/README.md

@@ -19,7 +19,7 @@ import (
 function main(){}
 	// Initialize the graphic context on an RGBA image
 	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
-	gc := draw2d.NewGraphicContext(dest)
+	gc := draw2dimg.NewGraphicContext(dest)
 	// Draw Android logo
 	fn, err := android.Main(gc, "png")
 	if err != nil {

samples/android/android.go

@@ -8,8 +8,9 @@ import (
 	"image/color"
 	"math"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples"
 )
 
 // Main draws a droid and returns the filename. This should only be
@@ -44,32 +45,32 @@ func Draw(gc draw2d.GraphicContext, x, y float64) {
 	gc.Stroke()
 
 	// left eye
-	draw2d.Circle(gc, x+60, y+45, 5)
+	draw2dkit.Circle(gc, x+60, y+45, 5)
 	gc.FillStroke()
 
 	// right eye
-	draw2d.Circle(gc, x+100, y+45, 5)
+	draw2dkit.Circle(gc, x+100, y+45, 5)
 	gc.FillStroke()
 
 	// body
-	draw2d.RoundRect(gc, x+30, y+75, x+30+100, y+75+90, 10, 10)
+	draw2dkit.RoundedRectangle(gc, x+30, y+75, x+30+100, y+75+90, 10, 10)
 	gc.FillStroke()
-	draw2d.Rect(gc, x+30, y+75, x+30+100, y+75+80)
+	draw2dkit.Rectangle(gc, x+30, y+75, x+30+100, y+75+80)
 	gc.FillStroke()
 
 	// left arm
-	draw2d.RoundRect(gc, x+5, y+80, x+5+20, y+80+70, 10, 10)
+	draw2dkit.RoundedRectangle(gc, x+5, y+80, x+5+20, y+80+70, 10, 10)
 	gc.FillStroke()
 
 	// right arm
-	draw2d.RoundRect(gc, x+135, y+80, x+135+20, y+80+70, 10, 10)
+	draw2dkit.RoundedRectangle(gc, x+135, y+80, x+135+20, y+80+70, 10, 10)
 	gc.FillStroke()
 
 	// left leg
-	draw2d.RoundRect(gc, x+50, y+150, x+50+20, y+150+50, 10, 10)
+	draw2dkit.RoundedRectangle(gc, x+50, y+150, x+50+20, y+150+50, 10, 10)
 	gc.FillStroke()
 
 	// right leg
-	draw2d.RoundRect(gc, x+90, y+150, x+90+20, y+150+50, 10, 10)
+	draw2dkit.RoundedRectangle(gc, x+90, y+150, x+90+20, y+150+50, 10, 10)
 	gc.FillStroke()
 }

samples/appengine/server.go

@@ -9,9 +9,9 @@ import (
 	"image/png"
 	"net/http"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dimg"
-	"gopkg.in/llgcode/draw2d.v1/draw2dpdf"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dpdf"
-	"gopkg.in/llgcode/draw2d.v1/samples/android"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/android"
 
 	"appengine"
 )
@@ -59,7 +59,7 @@ func imgPng(w http.ResponseWriter, r *http.Request) *appError {
 
 	// Initialize the graphic context on an RGBA image
 	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
-	gc := draw2d.NewGraphicContext(dest)
+	gc := draw2dimg.NewGraphicContext(dest)
 
 	// Draw sample
 	android.Draw(gc, 65, 0)

samples/frameimage/frameimage.go

@@ -7,8 +7,10 @@ package frameimage
 import (
 	"math"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dimg"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples"
 )
 
 // Main draws the image frame and returns the filename.
@@ -33,13 +35,12 @@ func Main(gc draw2d.GraphicContext, ext string) (string, error) {
 func Draw(gc draw2d.GraphicContext, png string,
 	dw, dh, margin, lineWidth float64) error {
 	// Draw frame
-	draw2d.RoundRect(gc, lineWidth, lineWidth,
+	draw2dkit.RoundedRectangle(gc, lineWidth, lineWidth, dw-lineWidth, dh-lineWidth, 100, 100)
-		dw-lineWidth, dh-lineWidth, 100, 100)
 	gc.SetLineWidth(lineWidth)
 	gc.FillStroke()
 
 	// load the source image
-	source, err := draw2d.LoadFromPngFile(png)
+	source, err := draw2dimg.LoadFromPngFile(png)
 	if err != nil {
 		return err
 	}

samples/geometry/geometry.go

@@ -9,9 +9,10 @@ import (
 	"image/color"
 	"math"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
-	"gopkg.in/llgcode/draw2d.v1/samples/gopher2"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples/gopher2"
 )
 
 // Main draws geometry and returns the filename. This should only be
@@ -98,7 +99,7 @@ func Dash(gc draw2d.GraphicContext, x, y, width, height float64) {
 	gc.MoveTo(x+sx*60.0, y)
 	gc.LineTo(x+sx*60.0, y)
 	gc.LineTo(x+sx*162, y+sy*205)
-	gc.RLineTo(sx*-102.4, 0.0)
+	rLineTo(gc, sx*-102.4, 0)
 	gc.CubicCurveTo(x+sx*-17, y+sy*205, x+sx*-17, y+sy*103, x+sx*60.0, y+sy*103.0)
 	gc.Stroke()
 	gc.SetLineDash(nil, 0.0)
@@ -188,12 +189,13 @@ func CubicCurve(gc draw2d.GraphicContext, x, y, width, height float64) {
 }
 
 // FillString draws a filled and stroked string.
+// And filles/stroked path created from string. Which may have different - unselectable -  output in non raster gc implementations.
 func FillString(gc draw2d.GraphicContext, x, y, width, height float64) {
 	sx, sy := width/100, height/100
 	gc.Save()
 	gc.SetStrokeColor(image.Black)
 	gc.SetLineWidth(1)
-	draw2d.RoundRect(gc, x+sx*5, y+sy*5, x+sx*95, y+sy*95, sx*10, sy*10)
+	draw2dkit.RoundedRectangle(gc, x+sx*5, y+sy*5, x+sx*95, y+sy*95, sx*10, sy*10)
 	gc.FillStroke()
 	gc.SetFillColor(image.Black)
 	gc.SetFontSize(height / 6)
@@ -201,18 +203,27 @@ func FillString(gc draw2d.GraphicContext, x, y, width, height float64) {
 	gc.SetFontData(draw2d.FontData{
 		Name:   "luxi",
 		Family: draw2d.FontFamilyMono,
-		Style:  draw2d.FontStyleBold | draw2d.FontStyleItalic})
+		Style:  draw2d.FontStyleBold | draw2d.FontStyleItalic,
+	})
 	w := gc.FillString("Hug")
 	gc.Translate(w+sx, 0)
 	left, top, right, bottom := gc.GetStringBounds("cou")
 	gc.SetStrokeColor(color.NRGBA{255, 0x33, 0x33, 0x80})
-	draw2d.Rect(gc, left, top, right, bottom)
+	draw2dkit.Rectangle(gc, left, top, right, bottom)
 	gc.SetLineWidth(height / 50)
 	gc.Stroke()
 	gc.SetFillColor(color.NRGBA{0x33, 0x33, 0xff, 0xff})
 	gc.SetStrokeColor(color.NRGBA{0x33, 0x33, 0xff, 0xff})
 	gc.SetLineWidth(height / 100)
 	gc.StrokeString("Hug")
+
+	gc.Translate(-(w + sx), sy*24)
+	w = gc.CreateStringPath("Hug", 0, 0)
+	gc.Fill()
+	gc.Translate(w+sx, 0)
+	gc.CreateStringPath("Hug", 0, 0)
+	path := gc.GetPath()
+	gc.Stroke((&path).VerticalFlip())
 	gc.Restore()
 }
 
@@ -221,14 +232,14 @@ func FillStroke(gc draw2d.GraphicContext, x, y, width, height float64) {
 	sx, sy := width/210, height/215
 	gc.MoveTo(x+sx*113.0, y)
 	gc.LineTo(x+sx*215.0, y+sy*215)
-	gc.RLineTo(sx*-100, 0)
+	rLineTo(gc, sx*-100, 0)
 	gc.CubicCurveTo(x+sx*35, y+sy*215, x+sx*35, y+sy*113, x+sx*113.0, y+sy*113)
 	gc.Close()
 
 	gc.MoveTo(x+sx*50.0, y)
-	gc.RLineTo(sx*51.2, sy*51.2)
+	rLineTo(gc, sx*51.2, sy*51.2)
-	gc.RLineTo(sx*-51.2, sy*51.2)
+	rLineTo(gc, sx*-51.2, sy*51.2)
-	gc.RLineTo(sx*-51.2, sy*-51.2)
+	rLineTo(gc, sx*-51.2, sy*-51.2)
 	gc.Close()
 
 	gc.SetLineWidth(width / 20.0)
@@ -237,33 +248,37 @@ func FillStroke(gc draw2d.GraphicContext, x, y, width, height float64) {
 	gc.FillStroke()
 }
 
+func rLineTo(path draw2d.PathBuilder, x, y float64) {
+	x0, y0 := path.LastPoint()
+	path.LineTo(x0+x, y0+y)
+}
+
 // FillStyle demonstrates the difference between even odd and non zero winding rule.
 func FillStyle(gc draw2d.GraphicContext, x, y, width, height float64) {
 	sx, sy := width/232, height/220
 	gc.SetLineWidth(width / 40)
 
-	draw2d.Rect(gc, x+sx*0, y+sy*12, x+sx*232, y+sy*70)
+	draw2dkit.Rectangle(gc, x+sx*0, y+sy*12, x+sx*232, y+sy*70)
 
-	wheel1 := new(draw2d.PathStorage)
+	var wheel1, wheel2 draw2d.Path
 	wheel1.ArcTo(x+sx*52, y+sy*70, sx*40, sy*40, 0, 2*math.Pi)
-	wheel2 := new(draw2d.PathStorage)
 	wheel2.ArcTo(x+sx*180, y+sy*70, sx*40, sy*40, 0, -2*math.Pi)
 
 	gc.SetFillRule(draw2d.FillRuleEvenOdd)
 	gc.SetFillColor(color.NRGBA{0, 0xB2, 0, 0xFF})
 
 	gc.SetStrokeColor(image.Black)
-	gc.FillStroke(wheel1, wheel2)
+	gc.FillStroke(&wheel1, &wheel2)
 
-	draw2d.Rect(gc, x, y+sy*140, x+sx*232, y+sy*198)
+	draw2dkit.Rectangle(gc, x, y+sy*140, x+sx*232, y+sy*198)
-	wheel1 = new(draw2d.PathStorage)
+	wheel1.Clear()
 	wheel1.ArcTo(x+sx*52, y+sy*198, sx*40, sy*40, 0, 2*math.Pi)
-	wheel2 = new(draw2d.PathStorage)
+	wheel2.Clear()
 	wheel2.ArcTo(x+sx*180, y+sy*198, sx*40, sy*40, 0, -2*math.Pi)
 
 	gc.SetFillRule(draw2d.FillRuleWinding)
 	gc.SetFillColor(color.NRGBA{0, 0, 0xE5, 0xFF})
-	gc.FillStroke(wheel1, wheel2)
+	gc.FillStroke(&wheel1, &wheel2)
 }
 
 // PathTransform scales a path differently in horizontal and vertical direction.

samples/gopher/gopher.go

@@ -8,8 +8,8 @@ package gopher
 import (
 	"image/color"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples"
 )
 
 // Main draws a left hand and ear of a gopher. Afterwards it returns
@@ -39,17 +39,17 @@ func Draw(gc draw2d.GraphicContext) {
 	// c0.389-6.064,1.088-12.128,0.744-18.216c-10.23-0.927-21.357,1.509-29.744,7.602C10.277,286.542,2.177,296.561,10.634,300.493"/>
 	gc.SetFillColor(color.RGBA{0xF6, 0xD2, 0xA2, 0xff})
 	gc.MoveTo(10.634, 300.493)
-	gc.RCubicCurveTo(0.764, 15.751, 16.499, 8.463, 23.626, 3.539)
+	rCubicCurveTo(gc, 0.764, 15.751, 16.499, 8.463, 23.626, 3.539)
-	gc.RCubicCurveTo(6.765, -4.675, 8.743, -0.789, 9.337, -10.015)
+	rCubicCurveTo(gc, 6.765, -4.675, 8.743, -0.789, 9.337, -10.015)
-	gc.RCubicCurveTo(0.389, -6.064, 1.088, -12.128, 0.744, -18.216)
+	rCubicCurveTo(gc, 0.389, -6.064, 1.088, -12.128, 0.744, -18.216)
-	gc.RCubicCurveTo(-10.23, -0.927, -21.357, 1.509, -29.744, 7.602)
+	rCubicCurveTo(gc, -10.23, -0.927, -21.357, 1.509, -29.744, 7.602)
 	gc.CubicCurveTo(10.277, 286.542, 2.177, 296.561, 10.634, 300.493)
 	gc.FillStroke()
 
 	// <path fill-rule="evenodd" clip-rule="evenodd" fill="#C6B198" stroke="#000000" stroke-width="3" stroke-linecap="round" d="
 	// M10.634,300.493c2.29-0.852,4.717-1.457,6.271-3.528"/>
 	gc.MoveTo(10.634, 300.493)
-	gc.RCubicCurveTo(2.29, -0.852, 4.717, -1.457, 6.271, -3.528)
+	rCubicCurveTo(gc, 2.29, -0.852, 4.717, -1.457, 6.271, -3.528)
 	gc.Stroke()
 
 	// Left Ear
@@ -61,3 +61,13 @@ func Draw(gc draw2d.GraphicContext) {
 	gc.Close()
 	gc.Stroke()
 }
+
+func rQuadCurveTo(path draw2d.PathBuilder, dcx, dcy, dx, dy float64) {
+	x, y := path.LastPoint()
+	path.QuadCurveTo(x+dcx, y+dcy, x+dx, y+dy)
+}
+
+func rCubicCurveTo(path draw2d.PathBuilder, dcx1, dcy1, dcx2, dcy2, dx, dy float64) {
+	x, y := path.LastPoint()
+	path.CubicCurveTo(x+dcx1, y+dcy1, x+dcx2, y+dcy2, x+dx, y+dy)
+}

samples/gopher2/gopher2.go

@@ -10,8 +10,9 @@ import (
 	"image/color"
 	"math"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples"
 )
 
 // Main draws a rotated face of the gopher. Afterwards it returns
@@ -46,61 +47,76 @@ func Draw(gc draw2d.GraphicContext, x, y, w, h float64) {
 	gc.Close()
 	gc.SetFillColor(brb)
 	gc.Fill()
+
 	// rectangle head bottom
-	draw2d.RoundRect(gc, x, y+h, x+w, y+h+h, h/5, h/5)
+	draw2dkit.RoundedRectangle(gc, x, y+h, x+w, y+h+h, h/5, h/5)
 	gc.Fill()
+
 	// left ear outside
-	draw2d.Circle(gc, x, y+h, w/12)
+	draw2dkit.Circle(gc, x, y+h, w/12)
 	gc.SetFillColor(brf)
 	gc.Fill()
+
 	// left ear inside
-	draw2d.Circle(gc, x, y+h, 0.5*w/12)
+	draw2dkit.Circle(gc, x, y+h, 0.5*w/12)
 	gc.SetFillColor(nf)
 	gc.Fill()
+
 	// right ear outside
-	draw2d.Circle(gc, x+w, y+h, w/12)
+	draw2dkit.Circle(gc, x+w, y+h, w/12)
 	gc.SetFillColor(brf)
 	gc.Fill()
+
 	// right ear inside
-	draw2d.Circle(gc, x+w, y+h, 0.5*w/12)
+	draw2dkit.Circle(gc, x+w, y+h, 0.5*w/12)
 	gc.SetFillColor(nf)
 	gc.Fill()
+
 	// left eye outside white
-	draw2d.Circle(gc, x+w/3, y+h23, w/9)
+	draw2dkit.Circle(gc, x+w/3, y+h23, w/9)
 	gc.SetFillColor(wf)
 	gc.Fill()
+
 	// left eye black
-	draw2d.Circle(gc, x+w/3+w/24, y+h23, 0.5*w/9)
+	draw2dkit.Circle(gc, x+w/3+w/24, y+h23, 0.5*w/9)
 	gc.SetFillColor(blf)
 	gc.Fill()
+
 	// left eye inside white
-	draw2d.Circle(gc, x+w/3+w/24+w/48, y+h23, 0.2*w/9)
+	draw2dkit.Circle(gc, x+w/3+w/24+w/48, y+h23, 0.2*w/9)
 	gc.SetFillColor(wf)
 	gc.Fill()
+
 	// right eye outside white
-	draw2d.Circle(gc, x+w-w/3, y+h23, w/9)
+	draw2dkit.Circle(gc, x+w-w/3, y+h23, w/9)
 	gc.Fill()
+
 	// right eye black
-	draw2d.Circle(gc, x+w-w/3+w/24, y+h23, 0.5*w/9)
+	draw2dkit.Circle(gc, x+w-w/3+w/24, y+h23, 0.5*w/9)
 	gc.SetFillColor(blf)
 	gc.Fill()
+
 	// right eye inside white
-	draw2d.Circle(gc, x+w-(w/3)+w/24+w/48, y+h23, 0.2*w/9)
+	draw2dkit.Circle(gc, x+w-(w/3)+w/24+w/48, y+h23, 0.2*w/9)
 	gc.SetFillColor(wf)
 	gc.Fill()
+
 	// left tooth
 	gc.SetFillColor(wf)
-	draw2d.RoundRect(gc, x+w/2-w/8, y+h+h/2.5, x+w/2-w/8+w/8, y+h+h/2.5+w/6, w/10, w/10)
+	draw2dkit.RoundedRectangle(gc, x+w/2-w/8, y+h+h/2.5, x+w/2-w/8+w/8, y+h+h/2.5+w/6, w/10, w/10)
 	gc.Fill()
+
 	// right tooth
-	draw2d.RoundRect(gc, x+w/2, y+h+h/2.5, x+w/2+w/8, y+h+h/2.5+w/6, w/10, w/10)
+	draw2dkit.RoundedRectangle(gc, x+w/2, y+h+h/2.5, x+w/2+w/8, y+h+h/2.5+w/6, w/10, w/10)
 	gc.Fill()
+
 	// snout
-	draw2d.Ellipse(gc, x+(w/2), y+h+h/2.5, w/6, w/12)
+	draw2dkit.Ellipse(gc, x+(w/2), y+h+h/2.5, w/6, w/12)
 	gc.SetFillColor(nf)
 	gc.Fill()
+
 	// nose
-	draw2d.Ellipse(gc, x+(w/2), y+h+h/7, w/10, w/12)
+	draw2dkit.Ellipse(gc, x+(w/2), y+h+h/7, w/10, w/12)
 	gc.SetFillColor(blf)
 	gc.Fill()
 }

samples/helloworld/helloworld.go

@@ -8,11 +8,10 @@ package helloworld
 import (
 	"fmt"
 	"image"
-	"image/color"
-	"math"
 
-	"gopkg.in/llgcode/draw2d.v1"
+	"git.fromouter.space/crunchy-rocks/draw2d"
-	"gopkg.in/llgcode/draw2d.v1/samples"
+	"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
+	"git.fromouter.space/crunchy-rocks/draw2d/samples"
 )
 
 // Main draws "Hello World" and returns the filename. This should only be
@@ -28,35 +27,14 @@ func Main(gc draw2d.GraphicContext, ext string) (string, error) {
 // Draw "Hello World"
 func Draw(gc draw2d.GraphicContext, text string) {
 	// Draw a rounded rectangle using default colors
-	draw2d.RoundRect(gc, 5, 5, 292, 205, 10, 10)
+	draw2dkit.RoundedRectangle(gc, 5, 5, 135, 95, 10, 10)
 	gc.FillStroke()
 
 	// Set the font luximbi.ttf
-	gc.SetFontData(draw2d.FontData{
+	gc.SetFontData(draw2d.FontData{Name: "luxi", Family: draw2d.FontFamilyMono, Style: draw2d.FontStyleBold | draw2d.FontStyleItalic})
-		Name:   "luxi",
-		Family: draw2d.FontFamilyMono,
-		Style:  draw2d.FontStyleBold | draw2d.FontStyleItalic})
 	// Set the fill text color to black
 	gc.SetFillColor(image.Black)
-	gc.SetDPI(72)
 	gc.SetFontSize(14)
 	// Display Hello World
-	gc.SetStrokeColor(color.NRGBA{0x33, 0xFF, 0x33, 0xFF})
+	gc.FillStringAt("Hello World", 8, 52)
-	gc.MoveTo(8, 0)
-	gc.LineTo(8, 52)
-	gc.LineTo(297, 52)
-	gc.Stroke()
-	gc.FillString(text)
-	gc.FillStringAt(text, 8, 52)
-
-	gc.Save()
-	gc.SetFillColor(color.NRGBA{0xFF, 0x33, 0x33, 0xFF})
-	gc.SetStrokeColor(color.NRGBA{0xFF, 0x33, 0x33, 0xFF})
-	gc.Translate(145, 85)
-	gc.StrokeStringAt(text, -50, 0)
-	gc.Rotate(math.Pi / 4)
-	gc.SetFillColor(color.NRGBA{0x33, 0x33, 0xFF, 0xFF})
-	gc.SetStrokeColor(color.NRGBA{0x33, 0x33, 0xFF, 0xFF})
-	gc.StrokeString(text)
-	gc.Restore()
 }