func TestTraceBoth(t *testing.T) {
img := genTestBitmap()
bm := gtr.NewBitmapFromImage(img, gtr.ThresholdAlpha)
{
paths, err := Trace(bm, nil)
if err != nil {
t.Fatal(err)
} else if len(paths) != 1 {
t.Fatal("wrong paths count:", len(paths))
} else if paths[0].Sign != +1 {
t.Fatal("wrong sign in path:", paths[0].Sign)
}
t.Log(paths)
}
{
paths, err := Trace(bm, nil)
if err != nil {
t.Fatal(err)
} else if len(paths) != 1 {
t.Fatal("wrong paths count:", len(paths))
} else if paths[0].Sign != +1 {
t.Fatal("wrong sign in path:", paths[0].Sign)
}
t.Log(paths)
}
}
func loadBitmap(t *testing.T) *gtr.Bitmap {
file, err := os.Open("../../inp.png")
if err != nil {
t.Skip(err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
t.Fatal(err)
}
bm := gtr.NewBitmapFromImage(img, func(x, y int, c color.Color) bool {
r, _, _, _ := c.RGBA()
return (float64(r)/0xffff)*0xff > 128
})
return bm
}