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("")) for i := 0; i < len(testsCubicFloat64)/8; i++ { f.Write([]byte(fmt.Sprintf("
\n", i))) } for i := 0; i < len(testsQuadFloat64); i++ { f.Write([]byte(fmt.Sprintf("
\n
\n", i))) } f.Write([]byte("")) } 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 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 }