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graphics: Add TestImage90DegreeRotate

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This commit is contained in:
Hajime Hoshi 2017-02-04 21:41:00 +09:00
parent c00a4985d4
commit dfa9eef753
1 changed files with 31 additions and 0 deletions
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31
image_test.go
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@ -203,6 +203,37 @@ func TestImageSelf(t *testing.T) {
} }
} }
func TestImage90DegreeRotate(t *testing.T) {
img0, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Size()
img1, err := NewImage(h, w, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
op := &DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 2)
op.GeoM.Translate(float64(h), 0)
if err := img1.DrawImage(img0, op); err != nil {
t.Fatal(err)
return
}
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
c0 := img0.At(i, j).(color.RGBA)
c1 := img1.At(h-j-1, i).(color.RGBA)
if c0 != c1 {
t.Errorf("img0.At(%[1]d, %[2]d) should equal to img1.At(%[3]d, %[4]d) but not: %[5]v vs %[6]v", i, j, h-j-1, i, c0, c1)
}
}
}
}
func TestImageDotByDotInversion(t *testing.T) { func TestImageDotByDotInversion(t *testing.T) {
img0, _, err := openEbitenImage("testdata/ebiten.png") img0, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil { if err != nil {