ebiten/docs/examples/hue.html
2018-03-21 14:34:48 +09:00

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<h2>Ebiten example - hue</h2>
<iframe src="hue.content.html" width="640" height="480"></iframe>
<div class="card"><pre class="card-body"><code class="language-go">// &#43;build example jsgo
package main
import (
&#34;bytes&#34;
&#34;image&#34;
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;math&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/examples/resources/images&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
gophersImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
count&#43;&#43;
if ebiten.IsRunningSlowly() {
return nil
}
// Center the image on the screen.
w, h := gophersImage.Size()
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
// Rotate the hue.
op.ColorM.RotateHue(float64(count%360) * 2 * math.Pi / 360)
screen.DrawImage(gophersImage, op)
return nil
}
func main() {
// Decode image from a byte slice instead of a file so that
// this example works in any working directory.
// If you want to use a file, there are some options:
// 1) Use os.Open and pass the file to the image decoder.
// This is a very regular way, but doesn&#39;t work on browsers.
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
// This works even on browsers.
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
// This also works on browsers.
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
if err != nil {
log.Fatal(err)
}
gophersImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Hue (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre></div>
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