2012-01-13 09:14:12 +00:00
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package curve
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import (
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2015-04-23 08:05:48 +00:00
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"bufio"
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2012-01-13 09:14:12 +00:00
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"fmt"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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2012-01-13 09:14:12 +00:00
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"log"
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"os"
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"testing"
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2015-04-16 09:51:13 +00:00
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2015-04-19 15:14:42 +00:00
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"github.com/llgcode/draw2d/raster"
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2012-01-13 09:14:12 +00:00
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)
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var (
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flattening_threshold float64 = 0.5
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testsCubicFloat64 = []float64{
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100, 100, 200, 100, 100, 200, 200, 200,
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100, 100, 300, 200, 200, 200, 300, 100,
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100, 100, 0, 300, 200, 0, 300, 300,
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150, 290, 10, 10, 290, 10, 150, 290,
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10, 290, 10, 10, 290, 10, 290, 290,
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100, 290, 290, 10, 10, 10, 200, 290,
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}
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testsQuadFloat64 = []float64{
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100, 100, 200, 100, 200, 200,
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100, 100, 290, 200, 290, 100,
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100, 100, 0, 290, 200, 290,
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150, 290, 10, 10, 290, 290,
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10, 290, 10, 10, 290, 290,
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100, 290, 290, 10, 120, 290,
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}
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)
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type Path struct {
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points []float64
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}
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2015-04-23 13:36:56 +00:00
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func (p *Path) MoveTo(x, y float64) {
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p.points = append(p.points, x, y)
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}
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func (p *Path) LineTo(x, y float64) {
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p.points = append(p.points, x, y)
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}
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func init() {
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os.Mkdir("test_results", 0666)
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f, err := os.Create("test_results/_test.html")
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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defer f.Close()
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log.Printf("Create html viewer")
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f.Write([]byte("<html><body>"))
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for i := 0; i < len(testsCubicFloat64)/8; i++ {
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f.Write([]byte(fmt.Sprintf("<div><img src='_test%d.png'/></div>\n", i)))
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}
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for i := 0; i < len(testsQuadFloat64); i++ {
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f.Write([]byte(fmt.Sprintf("<div><img src='_testQuad%d.png'/>\n</div>\n", i)))
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}
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f.Write([]byte("</body></html>"))
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}
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func drawPoints(img draw.Image, c color.Color, s ...float64) image.Image {
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for i := 0; i < len(s); i += 2 {
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x, y := int(s[i]+0.5), int(s[i+1]+0.5)
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img.Set(x, y, c)
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img.Set(x, y+1, c)
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img.Set(x, y-1, c)
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img.Set(x+1, y, c)
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img.Set(x+1, y+1, c)
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img.Set(x+1, y-1, c)
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img.Set(x-1, y, c)
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img.Set(x-1, y+1, c)
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img.Set(x-1, y-1, c)
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}
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return img
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}
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func TestCubicCurve(t *testing.T) {
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for i := 0; i < len(testsCubicFloat64); i += 8 {
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var p Path
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p.MoveTo(testsCubicFloat64[i], testsCubicFloat64[i+1])
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TraceCubic(&p, testsCubicFloat64[i:], flattening_threshold)
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img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
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raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, testsCubicFloat64[i:i+8]...)
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raster.PolylineBresenham(img, image.Black, p.points...)
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//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
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drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
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SaveToPngFile(fmt.Sprintf("test_results/_test%d.png", i/8), img)
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log.Printf("Num of points: %d\n", len(p.points))
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}
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fmt.Println()
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}
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func TestQuadCurve(t *testing.T) {
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for i := 0; i < len(testsQuadFloat64); i += 6 {
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var p Path
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p.MoveTo(testsQuadFloat64[i], testsQuadFloat64[i+1])
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TraceQuad(&p, testsQuadFloat64[i:], flattening_threshold)
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img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
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raster.PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, testsQuadFloat64[i:i+6]...)
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raster.PolylineBresenham(img, image.Black, p.points...)
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//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
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drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.points...)
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SaveToPngFile(fmt.Sprintf("test_results/_testQuad%d.png", i), img)
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log.Printf("Num of points: %d\n", len(p.points))
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}
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fmt.Println()
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}
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func BenchmarkCubicCurve(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for i := 0; i < len(testsCubicFloat64); i += 8 {
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var p Path
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p.MoveTo(testsCubicFloat64[i], testsCubicFloat64[i+1])
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TraceCubic(&p, testsCubicFloat64[i:], flattening_threshold)
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}
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}
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}
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// SaveToPngFile create and save an image to a file using PNG format
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func SaveToPngFile(filePath string, m image.Image) error {
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// Create the file
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f, err := os.Create(filePath)
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if err != nil {
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return err
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}
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defer f.Close()
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// Create Writer from file
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b := bufio.NewWriter(f)
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// Write the image into the buffer
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err = png.Encode(b, m)
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if err != nil {
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return err
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}
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err = b.Flush()
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if err != nil {
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return err
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}
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return nil
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}
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