ebiten/docs/examples/perspective.html
2018-01-06 02:59:32 +09:00

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<title>Ebiten example - perspective</title>
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<h2>Ebiten example - perspective</h2>
<iframe src="perspective.content.html" width="640" height="480"></iframe>
<div class="card"><pre class="card-body"><code class="language-go">// &#43;build example
package main
import (
&#34;image&#34;
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
gophersImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
if ebiten.IsRunningSlowly() {
return nil
}
op := &amp;ebiten.DrawImageOptions{}
w, h := gophersImage.Size()
for i := 0; i &lt; h; i&#43;&#43; {
op.GeoM.Reset()
width := w &#43; i*3/4
x := ((h - i) * 3 / 4) / 2
op.GeoM.Scale(float64(width)/float64(w), 1)
op.GeoM.Translate(float64(x), float64(i))
maxWidth := float64(w) &#43; float64(h)*3/4
op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
op.GeoM.Translate(screenWidth/2, screenHeight/2)
r := image.Rect(0, i, w, i&#43;1)
op.SourceRect = &amp;r
screen.DrawImage(gophersImage, op)
}
return nil
}
func main() {
var err error
gophersImage, _, err = ebitenutil.NewImageFromFile(ebitenutil.JoinStringsIntoFilePath(&#34;_resources&#34;, &#34;images&#34;, &#34;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)
}
}
</code></pre></div>
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