ebiten/_docs/public/examples/alphablending.html
2016-08-27 02:37:08 +09:00

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<title>Ebiten example - alphablending</title>
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<h1>Ebiten example - alphablending</h1>
<iframe src="alphablending.content.html" width="640" height="480"></iframe>
<pre><code>// &#43;build example
package main
import (
&#34;image/color&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
ebitenImage *ebiten.Image
)
type imageParts struct {
diff float64
}
func (p *imageParts) Src(i int) (int, int, int, int) {
w, h := ebitenImage.Size()
return 0, 0, w, h
}
func (p *imageParts) Dst(i int) (int, int, int, int) {
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
}
func (p *imageParts) Len() int {
return 10 * 10
}
func update(screen *ebiten.Image) error {
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
}
func main() {
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)
}
}
</code></pre>
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