crunchy-rocks/draw2d
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Draw points of segments to see subdivion

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This commit is contained in:
Laurent Le Goff 2011-05-19 10:44:16 +02:00
parent f02c5bc8c0
commit cc37e5c658
2 changed files with 26 additions and 4 deletions
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27
draw2d/curve/curve_test.go
View file

@ -8,6 +8,7 @@ import (
"bufio"
"image"
"image/png"
"exp/draw"
"draw2d.googlecode.com/hg/draw2d/raster"
)
@ -56,6 +57,22 @@ func savepng(filePath string, m image.Image) {
}
}
func drawPoints(img draw.Image, c image.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 testsFloat64 {
@ -67,7 +84,10 @@ func TestCubicCurveRec(t *testing.T) {
s = curve.SegmentRec(s)
img := image.NewNRGBA(300, 300)
raster.PolylineBresenham(img, image.NRGBAColor{0xff, 0, 0, 0xff}, curve.X1, curve.Y1, curve.X2, curve.Y2, curve.X3, curve.Y3, curve.X4, curve.Y4)
savepng(fmt.Sprintf("_testRec%d.png", i), raster.PolylineBresenham(img, image.Black, s...))
raster.PolylineBresenham(img, image.Black, s...)
drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve.X1, curve.Y1, curve.X2, curve.Y2, curve.X3, curve.Y3, curve.X4, curve.Y4)
drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, s...)
savepng(fmt.Sprintf("_testRec%d.png", i), img)
log.Printf("Num of points: %d\n", len(s))
}
}
@ -82,7 +102,10 @@ func TestCubicCurve(t *testing.T) {
s = curve.Segment(s)
img := image.NewNRGBA(300, 300)
raster.PolylineBresenham(img, image.NRGBAColor{0xff, 0, 0, 0xff}, curve.X1, curve.Y1, curve.X2, curve.Y2, curve.X3, curve.Y3, curve.X4, curve.Y4)
savepng(fmt.Sprintf("_test%d.png", i), raster.PolylineBresenham(img, image.Black, s...))
raster.PolylineBresenham(img, image.Black, s...)
drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve.X1, curve.Y1, curve.X2, curve.Y2, curve.X3, curve.Y3, curve.X4, curve.Y4)
drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, s...)
savepng(fmt.Sprintf("_test%d.png", i), img)
log.Printf("Num of points: %d\n", len(s))
}
}

3
draw2d/raster/line.go
View file

@ -12,11 +12,10 @@ func abs(i int) int {
return i
}
func PolylineBresenham(img draw.Image, c image.Color, s ...float64) image.Image {
func PolylineBresenham(img draw.Image, c image.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))
}
return img
}
func Bresenham(img draw.Image, color image.Color, x0, y0, x1, y1 int) {