ebiten/docs/examples/masking.html

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<!DOCTYPE html>
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<script src="../scripts/force-https.js"></script>
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
<link rel="icon" href="../favicon.png" type="image/png" >
<title>Ebiten example - masking</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<nav class="navbar"><div class="container">
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<nav class="d-flex flex-row" style="width: 100%;">
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<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<main><div class="container">
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<h2>Ebiten example - masking</h2>
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<iframe src="masking.content.html" width="640" height="480"></iframe>
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<pre class="card"><div class="card-body"><code class="language-go">// &#43;build example
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package main
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import (
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&#34;image&#34;
&#34;image/color&#34;
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;math&#34;
&#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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gophersImage *ebiten.Image
fiveyearsImage *ebiten.Image
maskImage *ebiten.Image
spotLightImage *ebiten.Image
spotLightX = 0
spotLightY = 0
spotLightVX = 1
spotLightVY = 1
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)
func update(screen *ebiten.Image) error {
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spotLightX &#43;= spotLightVX
spotLightY &#43;= spotLightVY
if spotLightX &lt; 0 {
spotLightX = -spotLightX
spotLightVX = -spotLightVX
}
if spotLightY &lt; 0 {
spotLightY = -spotLightY
spotLightVY = -spotLightVY
}
w, h := spotLightImage.Size()
maxX, maxY := screenWidth-w, screenHeight-h
if maxX &lt; spotLightX {
spotLightX = -spotLightX &#43; 2*maxX
spotLightVX = -spotLightVX
}
if maxY &lt; spotLightY {
spotLightY = -spotLightY &#43; 2*maxY
spotLightVY = -spotLightVY
}
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if ebiten.IsRunningSlowly() {
return nil
}
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maskImage.Clear()
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op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(spotLightX), float64(spotLightY))
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maskImage.DrawImage(spotLightImage, op)
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op = &amp;ebiten.DrawImageOptions{}
op.CompositeMode = ebiten.CompositeModeSourceOut
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maskImage.DrawImage(fiveyearsImage, op)
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screen.Fill(color.RGBA{0x00, 0x00, 0x80, 0xff})
screen.DrawImage(gophersImage, &amp;ebiten.DrawImageOptions{})
screen.DrawImage(maskImage, &amp;ebiten.DrawImageOptions{})
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return nil
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}
func max(a, b int) int {
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if a &lt; b {
return b
}
return a
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}
func min(a, b int) int {
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if a &lt; b {
return a
}
return b
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}
func main() {
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var err error
gophersImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/gophers.jpg&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
fiveyearsImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/fiveyears.jpg&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
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maskImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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as := image.Point{128, 128}
a := image.NewAlpha(image.Rectangle{image.ZP, as})
for j := 0; j &lt; as.Y; j&#43;&#43; {
for i := 0; i &lt; as.X; i&#43;&#43; {
r := as.X / 2
d := math.Sqrt(float64((i-r)*(i-r) &#43; (j-r)*(j-r)))
b := uint8(max(0, min(0xff, 3*0xff-int(d*3*0xff)/r)))
a.SetAlpha(i, j, color.Alpha{b})
}
}
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spotLightImage, _ = ebiten.NewImageFromImage(a, ebiten.FilterNearest)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Masking (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
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}
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</code></div></pre>
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</div></main>
<footer><div class="container">
<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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