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Merge pull request #59 from stanim/stani

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golint fixes and redirect curve tests results to output.curve folder
This commit is contained in:
Stani 2015-07-10 17:23:04 +02:00
commit fbb061ceef
12 changed files with 61 additions and 37 deletions
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2
.gitignore vendored
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@ -20,4 +20,4 @@ _test*
**/*.dll **/*.dll
**/core*[0-9] **/core*[0-9]
.private .private
output

4
README.md
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@ -1,14 +1,14 @@
draw2d 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 (draw2dopengl), which can also be used on the google app engine. It can be used as a pure go [Cairo](http://www.cairographics.org/) alternative. 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 (draw2dopengl), 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. See the [documentation](http://godoc.org/github.com/llgcode/draw2d) for more details.
Features Features
-------- --------
Operations in draw2d include stroking and filling polygons, arcs, Bézier curves, drawing images and text rendering with truetype fonts. All drawing operations can be transformed by affine transformations (scale, rotation, translation). draw2d is released under the BSD license. Operations in draw2d include stroking and filling polygons, arcs, Bézier curves, drawing images and text rendering with truetype fonts. All drawing operations can be transformed by affine transformations (scale, rotation, translation).
Package draw2d follows the conventions of the [HTML Canvas 2D Context](http://www.w3.org/TR/2dcontext/) for coordinate system, angles, etc... Package draw2d follows the conventions of the [HTML Canvas 2D Context](http://www.w3.org/TR/2dcontext/) for coordinate system, angles, etc...

36
curve/curve_test.go
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@ -15,7 +15,7 @@ import (
) )
var ( var (
flattening_threshold float64 = 0.5 flatteningThreshold = 0.5
testsCubicFloat64 = []CubicCurveFloat64{ testsCubicFloat64 = []CubicCurveFloat64{
CubicCurveFloat64{100, 100, 200, 100, 100, 200, 200, 200}, CubicCurveFloat64{100, 100, 200, 100, 100, 200, 200, 200},
CubicCurveFloat64{100, 100, 300, 200, 200, 200, 300, 100}, CubicCurveFloat64{100, 100, 300, 200, 200, 200, 300, 100},
@ -51,7 +51,7 @@ func (p *Path) LineTo(x, y float64) {
} }
func init() { func init() {
f, err := os.Create("_test.html") f, err := os.Create("../output/curve/test.html")
if err != nil { if err != nil {
log.Println(err) log.Println(err)
os.Exit(1) os.Exit(1)
@ -60,10 +60,10 @@ func init() {
log.Printf("Create html viewer") log.Printf("Create html viewer")
f.Write([]byte("<html><body>")) f.Write([]byte("<html><body>"))
for i := 0; i < len(testsCubicFloat64); i++ { 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))) 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++ { 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(fmt.Sprintf("<div><img src='testQuad%d.png'/>\n</div>\n", i)))
} }
f.Write([]byte("</body></html>")) f.Write([]byte("</body></html>"))
@ -110,13 +110,13 @@ func TestCubicCurveRec(t *testing.T) {
for i, curve := range testsCubicFloat64 { for i, curve := range testsCubicFloat64 {
var p Path var p Path
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.SegmentRec(&p, flattening_threshold) curve.SegmentRec(&p, flatteningThreshold)
img := image.NewNRGBA(image.Rect(0, 0, 300, 300)) img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...) raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
raster.PolylineBresenham(img, image.Black, p.points...) raster.PolylineBresenham(img, image.Black, p.points...)
//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...) //drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...) drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
savepng(fmt.Sprintf("_testRec%d.png", i), img) savepng(fmt.Sprintf("../output/curve/testRec%d.png", i), img)
log.Printf("Num of points: %d\n", len(p.points)) log.Printf("Num of points: %d\n", len(p.points))
} }
fmt.Println() fmt.Println()
@ -126,13 +126,13 @@ func TestCubicCurve(t *testing.T) {
for i, curve := range testsCubicFloat64 { for i, curve := range testsCubicFloat64 {
var p Path var p Path
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.Segment(&p, flattening_threshold) curve.Segment(&p, flatteningThreshold)
img := image.NewNRGBA(image.Rect(0, 0, 300, 300)) img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...) raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
raster.PolylineBresenham(img, image.Black, p.points...) raster.PolylineBresenham(img, image.Black, p.points...)
//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...) //drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...) drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
savepng(fmt.Sprintf("_test%d.png", i), img) savepng(fmt.Sprintf("../output/curve/test%d.png", i), img)
log.Printf("Num of points: %d\n", len(p.points)) log.Printf("Num of points: %d\n", len(p.points))
} }
fmt.Println() fmt.Println()
@ -148,7 +148,7 @@ func TestCubicCurveAdaptiveRec(t *testing.T) {
raster.PolylineBresenham(img, image.Black, p.points...) raster.PolylineBresenham(img, image.Black, p.points...)
//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...) //drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...) drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
savepng(fmt.Sprintf("_testAdaptiveRec%d.png", i), img) savepng(fmt.Sprintf("../output/curve/testAdaptiveRec%d.png", i), img)
log.Printf("Num of points: %d\n", len(p.points)) log.Printf("Num of points: %d\n", len(p.points))
} }
fmt.Println() fmt.Println()
@ -164,7 +164,7 @@ func TestCubicCurveAdaptive(t *testing.T) {
raster.PolylineBresenham(img, image.Black, p.points...) raster.PolylineBresenham(img, image.Black, p.points...)
//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...) //drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...) drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
savepng(fmt.Sprintf("_testAdaptive%d.png", i), img) savepng(fmt.Sprintf("../output/curve/testAdaptive%d.png", i), img)
log.Printf("Num of points: %d\n", len(p.points)) log.Printf("Num of points: %d\n", len(p.points))
} }
fmt.Println() fmt.Println()
@ -174,13 +174,13 @@ func TestCubicCurveParabolic(t *testing.T) {
for i, curve := range testsCubicFloat64 { for i, curve := range testsCubicFloat64 {
var p Path var p Path
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.ParabolicSegment(&p, flattening_threshold) curve.ParabolicSegment(&p, flatteningThreshold)
img := image.NewNRGBA(image.Rect(0, 0, 300, 300)) img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...) raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
raster.PolylineBresenham(img, image.Black, p.points...) raster.PolylineBresenham(img, image.Black, p.points...)
//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...) //drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...) drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
savepng(fmt.Sprintf("_testParabolic%d.png", i), img) savepng(fmt.Sprintf("../output/curve/testParabolic%d.png", i), img)
log.Printf("Num of points: %d\n", len(p.points)) log.Printf("Num of points: %d\n", len(p.points))
} }
fmt.Println() fmt.Println()
@ -190,13 +190,13 @@ func TestQuadCurve(t *testing.T) {
for i, curve := range testsQuadFloat64 { for i, curve := range testsQuadFloat64 {
var p Path var p Path
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.Segment(&p, flattening_threshold) curve.Segment(&p, flatteningThreshold)
img := image.NewNRGBA(image.Rect(0, 0, 300, 300)) img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...) raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, curve[:]...)
raster.PolylineBresenham(img, image.Black, p.points...) raster.PolylineBresenham(img, image.Black, p.points...)
//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...) //drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...) drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
savepng(fmt.Sprintf("_testQuad%d.png", i), img) savepng(fmt.Sprintf("../output/curve/testQuad%d.png", i), img)
log.Printf("Num of points: %d\n", len(p.points)) log.Printf("Num of points: %d\n", len(p.points))
} }
fmt.Println() fmt.Println()
@ -207,7 +207,7 @@ func BenchmarkCubicCurveRec(b *testing.B) {
for _, curve := range testsCubicFloat64 { for _, curve := range testsCubicFloat64 {
p := Path{make([]float64, 0, 32)} p := Path{make([]float64, 0, 32)}
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.SegmentRec(&p, flattening_threshold) curve.SegmentRec(&p, flatteningThreshold)
} }
} }
} }
@ -217,7 +217,7 @@ func BenchmarkCubicCurve(b *testing.B) {
for _, curve := range testsCubicFloat64 { for _, curve := range testsCubicFloat64 {
p := Path{make([]float64, 0, 32)} p := Path{make([]float64, 0, 32)}
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.Segment(&p, flattening_threshold) curve.Segment(&p, flatteningThreshold)
} }
} }
} }
@ -247,7 +247,7 @@ func BenchmarkCubicCurveParabolic(b *testing.B) {
for _, curve := range testsCubicFloat64 { for _, curve := range testsCubicFloat64 {
p := Path{make([]float64, 0, 32)} p := Path{make([]float64, 0, 32)}
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.ParabolicSegment(&p, flattening_threshold) curve.ParabolicSegment(&p, flatteningThreshold)
} }
} }
} }
@ -257,7 +257,7 @@ func BenchmarkQuadCurve(b *testing.B) {
for _, curve := range testsQuadFloat64 { for _, curve := range testsQuadFloat64 {
p := Path{make([]float64, 0, 32)} p := Path{make([]float64, 0, 32)}
p.LineTo(curve[0], curve[1]) p.LineTo(curve[0], curve[1])
curve.Segment(&p, flattening_threshold) curve.Segment(&p, flatteningThreshold)
} }
} }
} }

0
output/.empty
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4
output/curve/.gitignore vendored Normal file
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@ -0,0 +1,4 @@
# Ignore everything in this directory
*
# Except this file
!.gitignore

4
output/raster/.gitignore vendored Normal file
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@ -0,0 +1,4 @@
# Ignore everything in this directory
*
# Except this file
!.gitignore

4
output/samples/.gitignore vendored Normal file
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@ -0,0 +1,4 @@
# Ignore everything in this directory
*
# Except this file
!.gitignore

26
raster/raster_test.go
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@ -13,7 +13,7 @@ import (
"github.com/llgcode/draw2d/curve" "github.com/llgcode/draw2d/curve"
) )
var flattening_threshold float64 = 0.5 var flatteningThreshold = 0.5
func savepng(filePath string, m image.Image) { func savepng(filePath string, m image.Image) {
f, err := os.Create(filePath) f, err := os.Create(filePath)
@ -55,7 +55,7 @@ func TestFreetype(t *testing.T) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
@ -74,14 +74,14 @@ func TestFreetype(t *testing.T) {
painter.SetColor(color) painter.SetColor(color)
rasterizer.Rasterize(painter) rasterizer.Rasterize(painter)
savepng("../output/raster_TestFreetype.png", img) savepng("../output/raster/TestFreetype.png", img)
} }
func TestFreetypeNonZeroWinding(t *testing.T) { func TestFreetypeNonZeroWinding(t *testing.T) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
@ -100,7 +100,7 @@ func TestFreetypeNonZeroWinding(t *testing.T) {
painter.SetColor(color) painter.SetColor(color)
rasterizer.Rasterize(painter) rasterizer.Rasterize(painter)
savepng("../output/raster_TestFreetypeNonZeroWinding.png", img) savepng("../output/raster/TestFreetypeNonZeroWinding.png", img)
} }
func TestRasterizer(t *testing.T) { func TestRasterizer(t *testing.T) {
@ -108,7 +108,7 @@ func TestRasterizer(t *testing.T) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
tr := [6]float64{1, 0, 0, 1, 0, 0} tr := [6]float64{1, 0, 0, 1, 0, 0}
@ -116,7 +116,7 @@ func TestRasterizer(t *testing.T) {
//PolylineBresenham(img, image.Black, poly...) //PolylineBresenham(img, image.Black, poly...)
r.RenderEvenOdd(img, &color, &poly, tr) r.RenderEvenOdd(img, &color, &poly, tr)
savepng("../output/raster_TestRasterizer.png", img) savepng("../output/raster/TestRasterizer.png", img)
} }
func TestRasterizerNonZeroWinding(t *testing.T) { func TestRasterizerNonZeroWinding(t *testing.T) {
@ -124,7 +124,7 @@ func TestRasterizerNonZeroWinding(t *testing.T) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
tr := [6]float64{1, 0, 0, 1, 0, 0} tr := [6]float64{1, 0, 0, 1, 0, 0}
@ -132,14 +132,14 @@ func TestRasterizerNonZeroWinding(t *testing.T) {
//PolylineBresenham(img, image.Black, poly...) //PolylineBresenham(img, image.Black, poly...)
r.RenderNonZeroWinding(img, &color, &poly, tr) r.RenderNonZeroWinding(img, &color, &poly, tr)
savepng("../output/raster_TestRasterizerNonZeroWinding.png", img) savepng("../output/raster/TestRasterizerNonZeroWinding.png", img)
} }
func BenchmarkFreetype(b *testing.B) { func BenchmarkFreetype(b *testing.B) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
@ -165,7 +165,7 @@ func BenchmarkFreetypeNonZeroWinding(b *testing.B) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
@ -191,7 +191,7 @@ func BenchmarkRasterizerNonZeroWinding(b *testing.B) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
tr := [6]float64{1, 0, 0, 1, 0, 0} tr := [6]float64{1, 0, 0, 1, 0, 0}
@ -206,7 +206,7 @@ func BenchmarkRasterizer(b *testing.B) {
var p Path var p Path
p.LineTo(10, 190) p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190} c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flattening_threshold) c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points) poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff} color := color.RGBA{0, 0, 0, 0xff}
tr := [6]float64{1, 0, 0, 1, 0, 0} tr := [6]float64{1, 0, 0, 1, 0, 0}

5
rgba_interpolation.go
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@ -11,11 +11,15 @@ import (
"math" "math"
) )
// ImageFilter defines sampling filter (linear, bilinear or bicubic)
type ImageFilter int type ImageFilter int
const ( const (
// LinearFilter uses linear interpolation
LinearFilter ImageFilter = iota LinearFilter ImageFilter = iota
// BilinearFilter uses bilinear interpolation
BilinearFilter BilinearFilter
// BicubicFilter uses bicubic interpolation
BicubicFilter BicubicFilter
) )
@ -103,6 +107,7 @@ func cubic(offset, v0, v1, v2, v3 float64) uint32 {
(-9*v0+9*v2))*offset + (v0 + 16*v1 + v2)) / 18.0) (-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) { func DrawImage(src image.Image, dest draw.Image, tr MatrixTransform, op draw.Op, filter ImageFilter) {
bounds := src.Bounds() bounds := src.Bounds()
x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Max.X), float64(bounds.Max.Y) x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Max.X), float64(bounds.Max.Y)

2
samples/samples.go
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@ -20,5 +20,5 @@ func Output(name, ext string) string {
if ext == "pdf" { if ext == "pdf" {
root = "../" root = "../"
} }
return fmt.Sprintf("%soutput/%s.%s", root, name, ext) return fmt.Sprintf("%soutput/samples/%s.%s", root, name, ext)
} }

2
test
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@ -1,5 +1,5 @@
echo golint echo golint
golint ./... | grep "draw2dpdf\|samples" golint ./... | grep "draw2dpdf\|samples\|^advanced_path\|^arc\|draw2d[.]\|fileutil\|^gc\|math\|^path[.]\|rgba_interpolation\|test\|vertex2d"
echo echo
echo go vet echo go vet
go vet ./... go vet ./...

7
vertex2d.go
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@ -3,16 +3,23 @@
package draw2d package draw2d
// VertexCommand defines different commands to describe the vertex of a path.
type VertexCommand byte type VertexCommand byte
const ( const (
// VertexNoCommand does nothing
VertexNoCommand VertexCommand = iota VertexNoCommand VertexCommand = iota
// VertexStartCommand starts a (sub)path
VertexStartCommand VertexStartCommand
// VertexJoinCommand joins the two edges at the vertex
VertexJoinCommand VertexJoinCommand
// VertexCloseCommand closes the subpath
VertexCloseCommand VertexCloseCommand
// VertexStopCommand is the endpoint of the path.
VertexStopCommand VertexStopCommand
) )
// VertexConverter allows to convert vertices.
type VertexConverter interface { type VertexConverter interface {
NextCommand(cmd VertexCommand) NextCommand(cmd VertexCommand)
Vertex(x, y float64) Vertex(x, y float64)