Start path package
This commit is contained in:
Laurent Le Goff
parent
06178b5d2d
commit
d6812fd8e6
3 changed files with 283 additions and 0 deletions
44
path/drawing_kit.go
Normal file
44
path/drawing_kit.go
Normal file
|
|
@ -0,0 +1,44 @@
|
|||
// Copyright 2010 The draw2d Authors. All rights reserved.
|
||||
// created: 13/12/2010 by Laurent Le Goff
|
||||
|
||||
package path
|
||||
|
||||
import (
|
||||
"math"
|
||||
)
|
||||
|
||||
// Rectangle draw a rectangle using a PathBuilder
|
||||
func Rectangle(path PathBuilder, x1, y1, x2, y2 float64) {
|
||||
path.MoveTo(x1, y1)
|
||||
path.LineTo(x2, y1)
|
||||
path.LineTo(x2, y2)
|
||||
path.LineTo(x1, y2)
|
||||
path.Close()
|
||||
}
|
||||
|
||||
// RoundedRectangle draw a rounded rectangle using a PathBuilder
|
||||
func RoundedRectangle(path PathBuilder, x1, y1, x2, y2, arcWidth, arcHeight float64) {
|
||||
arcWidth = arcWidth / 2
|
||||
arcHeight = arcHeight / 2
|
||||
path.MoveTo(x1, y1+arcHeight)
|
||||
path.QuadCurveTo(x1, y1, x1+arcWidth, y1)
|
||||
path.LineTo(x2-arcWidth, y1)
|
||||
path.QuadCurveTo(x2, y1, x2, y1+arcHeight)
|
||||
path.LineTo(x2, y2-arcHeight)
|
||||
path.QuadCurveTo(x2, y2, x2-arcWidth, y2)
|
||||
path.LineTo(x1+arcWidth, y2)
|
||||
path.QuadCurveTo(x1, y2, x1, y2-arcHeight)
|
||||
path.Close()
|
||||
}
|
||||
|
||||
// Ellipse draw an ellipse using a PathBuilder
|
||||
func Ellipse(path PathBuilder, cx, cy, rx, ry float64) {
|
||||
path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2)
|
||||
path.Close()
|
||||
}
|
||||
|
||||
// Circle draw an circle using a PathBuilder
|
||||
func Circle(path PathBuilder, cx, cy, radius float64) {
|
||||
path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2)
|
||||
path.Close()
|
||||
}
|
||||
63
path/interpret.go
Normal file
63
path/interpret.go
Normal file
|
|
@ -0,0 +1,63 @@
|
|||
// Copyright 2010 The draw2d Authors. All rights reserved.
|
||||
// created: 06/12/2010 by Laurent Le Goff
|
||||
|
||||
package path
|
||||
|
||||
import (
|
||||
"github.com/llgcode/draw2d/curve"
|
||||
)
|
||||
|
||||
type PathConverter struct {
|
||||
converter LineBuilder
|
||||
ApproximationScale float64
|
||||
}
|
||||
|
||||
func NewPathConverter(converter LineBuilder) *PathConverter {
|
||||
return &PathConverter{converter, 1, 0, 0, 0, 0}
|
||||
}
|
||||
|
||||
// may not been in path instead put it in a troke package thing
|
||||
func (c *PathConverter) Interpret(liner LineBuilder, scale float64, paths ...*Path) {
|
||||
// First Point
|
||||
var startX, startY float64 = 0, 0
|
||||
// Current Point
|
||||
var x, y float64 = 0, 0
|
||||
for _, path := range paths {
|
||||
i := 0
|
||||
for _, cmd := range path.Components {
|
||||
switch cmd {
|
||||
case MoveToCmp:
|
||||
x, y = path.Points[i], path.Points[i+1]
|
||||
startX, startY = x, y
|
||||
if i != 0 {
|
||||
liner.End()
|
||||
}
|
||||
liner.MoveTo(x, y)
|
||||
i += 2
|
||||
case LineToCmp:
|
||||
x, y = path.Points[i], path.Points[i+1]
|
||||
liner.LineTo(x, y)
|
||||
liner.LineJoin()
|
||||
i += 2
|
||||
case QuadCurveToCmp:
|
||||
curve.TraceQuad(liner, path.Points[i-2:], 0.5)
|
||||
x, y = path.Points[i+2], path.Points[i+3]
|
||||
liner.LineTo(x, y)
|
||||
i += 4
|
||||
case CubicCurveToCmp:
|
||||
curve.TraceCubic(liner, path.Points[i-2:], 0.5)
|
||||
x, y = path.Points[i+4], path.Points[i+5]
|
||||
liner.LineTo(x, y)
|
||||
i += 6
|
||||
case ArcToCmp:
|
||||
x, y = arc(liner, path.Points[i], path.Points[i+1], path.Points[i+2], path.Points[i+3], path.Points[i+4], path.Points[i+5], scale)
|
||||
liner.LineTo(x, y)
|
||||
i += 6
|
||||
case CloseCmp:
|
||||
liner.LineTo(startX, startY)
|
||||
liner.Close()
|
||||
}
|
||||
}
|
||||
liner.End()
|
||||
}
|
||||
}
|
||||
176
path/path.go
Normal file
176
path/path.go
Normal file
|
|
@ -0,0 +1,176 @@
|
|||
// Copyright 2010 The draw2d Authors. All rights reserved.
|
||||
// created: 21/11/2010 by Laurent Le Goff
|
||||
|
||||
// Package path implements function to build path
|
||||
package path
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"math"
|
||||
)
|
||||
|
||||
// PathBuilder define method that create path
|
||||
type PathBuilder interface {
|
||||
// Return the current point of the current path
|
||||
LastPoint() (x, y float64)
|
||||
|
||||
// MoveTo start a new path at (x, y) position
|
||||
MoveTo(x, y float64)
|
||||
|
||||
// LineTo add a line to the current path
|
||||
LineTo(x, y float64)
|
||||
|
||||
// QuadCurveTo add a quadratic curve to the current path
|
||||
QuadCurveTo(cx, cy, x, y float64)
|
||||
|
||||
// CubicCurveTo add a cubic bezier curve to the current path
|
||||
CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)
|
||||
|
||||
// ArcTo add an arc to the path
|
||||
ArcTo(cx, cy, rx, ry, startAngle, angle float64)
|
||||
|
||||
// Close the current path
|
||||
Close()
|
||||
}
|
||||
|
||||
// Component represent components of a path
|
||||
type Component int
|
||||
|
||||
const (
|
||||
MoveToCmp Component = iota
|
||||
LineToCmp
|
||||
QuadCurveToCmp
|
||||
CubicCurveToCmp
|
||||
ArcToCmp
|
||||
CloseCmp
|
||||
)
|
||||
|
||||
// Type Path store path
|
||||
type Path struct {
|
||||
Components []Component
|
||||
Points []float64
|
||||
x, y float64
|
||||
}
|
||||
|
||||
func (p *Path) Clear() {
|
||||
p.Components = p.Components[0:0]
|
||||
p.Points = p.Points[0:0]
|
||||
return
|
||||
}
|
||||
|
||||
func (p *Path) appendToPath(cmd Component, points ...float64) {
|
||||
p.Components = append(p.Components, cmd)
|
||||
p.Points = append(p.Points, points...)
|
||||
}
|
||||
|
||||
// Copy make a clone of the current path and return it
|
||||
func (src *Path) Copy() (dest *Path) {
|
||||
dest = new(Path)
|
||||
dest.Components = make([]Component, len(src.Components))
|
||||
copy(dest.Components, src.Components)
|
||||
dest.Points = make([]float64, len(src.Points))
|
||||
copy(dest.Points, src.Points)
|
||||
dest.x, dest.y = src.x, src.y
|
||||
return dest
|
||||
}
|
||||
|
||||
func (p *Path) LastPoint() (x, y float64) {
|
||||
return p.x, p.y
|
||||
}
|
||||
|
||||
func (p *Path) IsEmpty() bool {
|
||||
return len(p.Components) == 0
|
||||
}
|
||||
|
||||
func (p *Path) Close() {
|
||||
p.appendToPath(CloseCmp)
|
||||
}
|
||||
|
||||
func (p *Path) MoveTo(x, y float64) {
|
||||
p.appendToPath(MoveToCmp, x, y)
|
||||
|
||||
p.x = x
|
||||
p.y = y
|
||||
}
|
||||
|
||||
func (p *Path) LineTo(x, y float64) {
|
||||
if len(p.Components) == 0 { //special case when no move has been done
|
||||
p.MoveTo(0, 0)
|
||||
}
|
||||
p.appendToPath(LineToCmp, x, y)
|
||||
p.x = x
|
||||
p.y = y
|
||||
}
|
||||
|
||||
func (p *Path) QuadCurveTo(cx, cy, x, y float64) {
|
||||
if len(p.Components) == 0 { //special case when no move has been done
|
||||
p.MoveTo(0, 0)
|
||||
}
|
||||
p.appendToPath(QuadCurveToCmp, cx, cy, x, y)
|
||||
p.x = x
|
||||
p.y = y
|
||||
}
|
||||
|
||||
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(0, 0)
|
||||
}
|
||||
p.appendToPath(CubicCurveToCmp, cx1, cy1, cx2, cy2, x, y)
|
||||
p.x = x
|
||||
p.y = y
|
||||
}
|
||||
|
||||
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
|
||||
}
|
||||
|
||||
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
|
||||
}
|
||||
Loading…
Reference in a new issue