ebiten/docs/examples/alphablending.html

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<!DOCTYPE html>
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<title>Ebiten example - alphablending</title>
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<a class="navbar-brand" href="..">Ebiten</a>
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<main><div class="container">
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<h2>Ebiten example - alphablending</h2>
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<iframe src="alphablending.content.html" width="640" height="480"></iframe>
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<pre><code class="language-go">// &#43;build example
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package main
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import (
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&#34;image/color&#34;
_ &#34;image/png&#34;
&#34;log&#34;
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&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
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)
const (
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screenWidth = 320
screenHeight = 240
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)
var (
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count int
ebitenImage *ebiten.Image
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)
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type imageParts struct {
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diff float64
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}
func (p *imageParts) Src(i int) (int, int, int, int) {
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w, h := ebitenImage.Size()
return 0, 0, w, h
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}
func (p *imageParts) Dst(i int) (int, int, int, int) {
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x := int(float64(i%10)*p.diff &#43; 15)
y := int(float64(i/10)*p.diff &#43; 20)
w, h := ebitenImage.Size()
return x, y, x &#43; w, y &#43; h
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}
func (p *imageParts) Len() int {
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return 10 * 10
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}
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func update(screen *ebiten.Image) error {
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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 err := screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff}); err != nil {
return err
}
op := &amp;ebiten.DrawImageOptions{}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
op.ImageParts = &amp;imageParts{
diff: diff,
}
if err := screen.DrawImage(ebitenImage, op); err != nil {
return err
}
return nil
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}
func main() {
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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)
}
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}
</code></pre>
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</div></main>
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<p>© 2013 Hajime Hoshi</p>
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<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
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<p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p>
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