ebiten/_docs/public/examples/perspective.html
2016-08-27 14:00:06 +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>
<pre><code class="language-go">// &#43;build example
package main
import (
_ &#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
)
type parts struct {
image *ebiten.Image
}
func (p parts) Len() int {
_, h := p.image.Size()
return h
}
func (p parts) Dst(i int) (x0, y0, x1, y1 int) {
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
}
func (p parts) Src(i int) (x0, y0, x1, y1 int) {
w, _ := p.image.Size()
return 0, i, w, i &#43; 1
}
func update(screen *ebiten.Image) error {
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)
if err := screen.DrawImage(gophersImage, op); err != nil {
return err
}
return nil
}
func main() {
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)
}
}
</code></pre>
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