ebiten/docs/examples/alphablending.html
2017-08-18 03:00:05 +09:00

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<h2>Ebiten example - alphablending</h2>
<iframe src="alphablending.content.html" width="640" height="480"></iframe>
<pre class="card"><div class="card-body"><code class="language-go">// &#43;build example
package main
import (
&#34;image/color&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
ebitenImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
count&#43;&#43;
count %= ebiten.FPS * 10
diff := float64(count) * 0.2
switch {
case 480 &lt; count:
diff = 0
case 240 &lt; count:
diff = float64(480-count) * 0.2
}
if ebiten.IsRunningSlowly() {
return nil
}
screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
op := &amp;ebiten.DrawImageOptions{}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
for i := 0; i &lt; 10*10; i&#43;&#43; {
op.GeoM.Reset()
x := float64(i%10)*diff &#43; 15
y := float64(i/10)*diff &#43; 20
op.GeoM.Translate(x, y)
screen.DrawImage(ebitenImage, op)
}
return nil
}
func main() {
var err error
ebitenImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/ebiten.png&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Alpha Blending (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></div></pre>
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