mirror of
https://github.com/hajimehoshi/ebiten.git
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116 lines
3.4 KiB
HTML
116 lines
3.4 KiB
HTML
<!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" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - alphablending</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<link rel="stylesheet" href="../stylesheets/highlight-github.css">
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<link rel="stylesheet" href="../stylesheets/ebiten.css">
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<script src="../scripts/googleanalytics.js"></script>
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<header class="navbar"><div class="container">
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<div class="navbar-header">
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<a class="navbar-brand" href="..">Ebiten</a>
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</div>
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<nav class="collapse navbar-collapse">
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<ul class="nav navbar-nav navbar-right">
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<li><a href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li><a href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<li><a href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
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</ul>
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</nav>
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</header>
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<main><div class="container">
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<h2>Ebiten example - alphablending</h2>
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<iframe src="alphablending.content.html" width="640" height="480"></iframe>
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<pre><code class="language-go">// +build example
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package main
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import (
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"image/color"
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_ "image/png"
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"log"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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count int
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ebitenImage *ebiten.Image
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)
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type imageParts struct {
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diff float64
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}
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func (p *imageParts) Src(i int) (int, int, int, int) {
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w, h := ebitenImage.Size()
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return 0, 0, w, h
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}
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func (p *imageParts) Dst(i int) (int, int, int, int) {
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x := int(float64(i%10)*p.diff + 15)
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y := int(float64(i/10)*p.diff + 20)
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w, h := ebitenImage.Size()
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return x, y, x + w, y + h
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}
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func (p *imageParts) Len() int {
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return 10 * 10
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}
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func update(screen *ebiten.Image) error {
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count++
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count %= ebiten.FPS * 10
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diff := float64(count) * 0.2
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switch {
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case 480 < count:
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diff = 0
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case 240 < count:
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diff = float64(480-count) * 0.2
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}
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if ebiten.IsRunningSlowly() {
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return nil
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}
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screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
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op := &ebiten.DrawImageOptions{}
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op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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op.ImageParts = &imageParts{
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diff: diff,
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}
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screen.DrawImage(ebitenImage, op)
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return nil
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}
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func main() {
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var err error
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ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre>
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</div></main>
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<footer><div class="container">
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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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<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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</div></footer>
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<script src="../scripts/highlight.pack.js"></script>
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<script>hljs.initHighlightingOnLoad();</script>
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