ebiten/docs/examples/perspective.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" >
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<title>Ebiten example - perspective</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<header class="navbar"><div class="container">
<div class="navbar-header">
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<a class="navbar-brand" href="..">Ebiten</a>
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<li><a href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<main><div class="container">
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<h2>Ebiten example - perspective</h2>
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<iframe src="perspective.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/jpeg&#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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gophersImage *ebiten.Image
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)
type parts struct {
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image *ebiten.Image
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}
func (p parts) Len() int {
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_, h := p.image.Size()
return h
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}
func (p parts) Dst(i int) (x0, y0, x1, y1 int) {
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w, h := p.image.Size()
width := w &#43; i*3/4
x := ((h - i) * 3 / 4) / 2
return x, i, x &#43; width, i &#43; 1
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}
func (p parts) Src(i int) (x0, y0, x1, y1 int) {
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w, _ := p.image.Size()
return 0, i, w, i &#43; 1
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}
func update(screen *ebiten.Image) error {
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if ebiten.IsRunningSlowly() {
return nil
}
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op := &amp;ebiten.DrawImageOptions{
ImageParts: &amp;parts{gophersImage},
}
w, h := gophersImage.Size()
maxWidth := float64(w) &#43; float64(h)*0.75
op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
op.GeoM.Translate(screenWidth/2, screenHeight/2)
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screen.DrawImage(gophersImage, op)
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return nil
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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)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Perspective (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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