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Simplify rotate/main.go

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This commit is contained in:
Hajime Hoshi 2014-12-28 14:40:20 +09:00
parent a653ba9258
commit 161b3d1316
1 changed files with 2 additions and 20 deletions
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18
example/rotate/main.go
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@ -29,31 +29,13 @@ const (
var ( var (
count int count int
horizontalCount int
verticalCount int
gophersImage *ebiten.Image gophersImage *ebiten.Image
) )
func update(screen *ebiten.Image) error { func update(screen *ebiten.Image) error {
count++ count++
if ebiten.IsKeyPressed(ebiten.KeyLeft) {
horizontalCount--
}
if ebiten.IsKeyPressed(ebiten.KeyRight) {
horizontalCount++
}
if ebiten.IsKeyPressed(ebiten.KeyDown) {
verticalCount--
}
if ebiten.IsKeyPressed(ebiten.KeyUp) {
verticalCount++
}
w, h := gophersImage.Size() w, h := gophersImage.Size()
geo := ebiten.TranslateGeo(-float64(w)/2, -float64(h)/2) geo := ebiten.TranslateGeo(-float64(w)/2, -float64(h)/2)
scaleX := math.Pow(1.05, float64(horizontalCount))
scaleY := math.Pow(1.05, float64(verticalCount))
geo.Concat(ebiten.ScaleGeo(scaleX, scaleY))
geo.Concat(ebiten.RotateGeo(float64(count%720) * 2 * math.Pi / 720)) geo.Concat(ebiten.RotateGeo(float64(count%720) * 2 * math.Pi / 720))
geo.Concat(ebiten.TranslateGeo(screenWidth/2, screenHeight/2)) geo.Concat(ebiten.TranslateGeo(screenWidth/2, screenHeight/2))
if err := screen.DrawImage(gophersImage, &ebiten.DrawImageOptions{ if err := screen.DrawImage(gophersImage, &ebiten.DrawImageOptions{