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examples/minify: Add rotation

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This commit is contained in:
Hajime Hoshi 2018-07-29 23:24:18 +09:00
parent a321155ab5
commit b02b2de626
1 changed files with 13 additions and 2 deletions
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15
examples/minify/main.go
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@ -30,6 +30,7 @@ import (
"github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil" "github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/examples/resources/images" "github.com/hajimehoshi/ebiten/examples/resources/images"
"github.com/hajimehoshi/ebiten/inpututil"
) )
const ( const (
@ -39,6 +40,7 @@ const (
var ( var (
gophersImage *ebiten.Image gophersImage *ebiten.Image
rotate = false
counter = 0 counter = 0
) )
@ -48,17 +50,26 @@ func update(screen *ebiten.Image) error {
counter = 0 counter = 0
} }
if inpututil.IsKeyJustPressed(ebiten.KeyR) {
rotate = !rotate
}
if ebiten.IsDrawingSkipped() { if ebiten.IsDrawingSkipped() {
return nil return nil
} }
s := 1.5 / math.Pow(1.01, float64(counter)) s := 1.5 / math.Pow(1.01, float64(counter))
ebitenutil.DebugPrint(screen, fmt.Sprintf("Minifying images (Nearest filter vs Linear filter)\nScale: %0.2f", s)) ebitenutil.DebugPrint(screen, fmt.Sprintf("Minifying images (Nearest filter vs Linear filter): Press R to rotate the images.\nScale: %0.2f", s))
for i, f := range []ebiten.Filter{ebiten.FilterNearest, ebiten.FilterLinear} { for i, f := range []ebiten.Filter{ebiten.FilterNearest, ebiten.FilterLinear} {
w, _ := gophersImage.Size() w, h := gophersImage.Size()
op := &ebiten.DrawImageOptions{} op := &ebiten.DrawImageOptions{}
if rotate {
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
op.GeoM.Rotate(float64(counter) / 300 * 2 * math.Pi)
op.GeoM.Translate(float64(w)/2, float64(h)/2)
}
op.GeoM.Scale(s, s) op.GeoM.Scale(s, s)
op.GeoM.Translate(32+float64(i*w)*s+float64(i*4), 64) op.GeoM.Translate(32+float64(i*w)*s+float64(i*4), 64)
op.Filter = f op.Filter = f