func animateDeadGopher(a *f32.Affine, t clock.Time) {
dt := float32(t)
a.Scale(a, 1+dt/20, 1+dt/20)
a.Translate(a, 0.5, 0.5)
a.Rotate(a, dt/math.Pi/-8)
a.Translate(a, -0.5, -0.5)
}
func (a *arrangerFunc) Arrange(e s.Engine, n *s.Node, t clock.Time) {
sprite, _ := a.eng.sprites[n]
frameTime := float32(t - a.eng.lastUpdate)
updatePosition(sprite, frameTime)
screenWidthScaler, screenHeightScaler := a.eng.GetScreenScalers()
actualScaleX := screenWidthScaler * sprite.ScaleX
actualScaleY := screenHeightScaler * sprite.ScaleY
actualPositionX := screenWidthScaler * sprite.X
actualPositionY := screenHeightScaler * sprite.Y
e.SetSubTex(n, *sprite.GetCurrentFrame().Texture)
r := sprite.Rotation * math.Pi / 180
matrix := f32.Affine{
{1, 0, 0},
{0, 1, 0},
}
matrix.Translate(&matrix, actualPositionX, actualPositionY)
//matrix.Translate(&matrix, sprite.X, sprite.Y)
matrix.Rotate(&matrix, r)
matrix.Scale(&matrix, actualScaleX, actualScaleY)
e.SetTransform(n, matrix)
a.eng.lastUpdate = t
}
func TestAffine(t *testing.T) {
f, err := os.Open("../../../testdata/testpattern.png")
if err != nil {
t.Fatal(err)
}
defer f.Close()
srcOrig, _, err := image.Decode(f)
if err != nil {
t.Fatal(err)
}
src := image.NewRGBA(srcOrig.Bounds())
draw.Draw(src, src.Rect, srcOrig, srcOrig.Bounds().Min, draw.Src)
const (
pixW = 100
pixH = 100
ptW = geom.Pt(50)
ptH = geom.Pt(50)
)
cfg := event.Config{
Width: ptW,
Height: ptH,
PixelsPerPt: float32(pixW) / float32(ptW),
}
got := image.NewRGBA(image.Rect(0, 0, pixW, pixH))
blue := image.NewUniform(color.RGBA{B: 0xff, A: 0xff})
draw.Draw(got, got.Bounds(), blue, image.Point{}, draw.Src)
b := src.Bounds()
b.Min.X += 10
b.Max.Y /= 2
var a f32.Affine
a.Identity()
a.Scale(&a, cfg.PixelsPerPt, cfg.PixelsPerPt)
a.Translate(&a, 0, 24)
a.Rotate(&a, float32(math.Asin(12./20)))
// See commentary in the render method defined in portable.go.
a.Scale(&a, 40/float32(b.Dx()), 20/float32(b.Dy()))
a.Inverse(&a)
affine(got, src, b, nil, &a, draw.Over)
ptTopLeft := geom.Point{0, 24}
ptBottomRight := geom.Point{12 + 32, 16}
drawCross(got, 0, 0)
drawCross(got, int(ptTopLeft.X.Px(cfg.PixelsPerPt)), int(ptTopLeft.Y.Px(cfg.PixelsPerPt)))
drawCross(got, int(ptBottomRight.X.Px(cfg.PixelsPerPt)), int(ptBottomRight.Y.Px(cfg.PixelsPerPt)))
drawCross(got, pixW-1, pixH-1)
const wantPath = "../../../testdata/testpattern-window.png"
f, err = os.Open(wantPath)
if err != nil {
t.Fatal(err)
}
defer f.Close()
wantSrc, _, err := image.Decode(f)
if err != nil {
t.Fatal(err)
}
want, ok := wantSrc.(*image.RGBA)
if !ok {
b := wantSrc.Bounds()
want = image.NewRGBA(b)
draw.Draw(want, b, wantSrc, b.Min, draw.Src)
}
if !imageEq(got, want) {
gotPath, err := writeTempPNG("testpattern-window-got", got)
if err != nil {
t.Fatal(err)
}
t.Errorf("got\n%s\nwant\n%s", gotPath, wantPath)
}
}
