ebiten/_docs/public/examples/rotate.html
2016-08-28 00:48:15 +09:00

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<title>Ebiten example - rotate</title>
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<h2>Ebiten example - rotate</h2>
<iframe src="rotate.content.html" width="640" height="480"></iframe>
<pre><code class="language-go">// &#43;build example
package main
import (
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;math&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
gophersImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
count&#43;&#43;
w, h := gophersImage.Size()
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
op.GeoM.Rotate(float64(count%360) * 2 * math.Pi / 360)
op.GeoM.Translate(screenWidth/2, screenHeight/2)
if err := screen.DrawImage(gophersImage, op); err != nil {
return err
}
return nil
}
func main() {
var err error
gophersImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/gophers.jpg&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Rotate (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
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