ebiten/_docs/public/examples/hue.html
2016-05-14 21:15:27 +09:00

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<!DOCTYPE html>
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Copyright 2013 Hajime Hoshi
Licensed under the Apache License, Version 2.0 (the "License");
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
<link rel="icon" href="../favicon.png" type="image/png" >
<title>Ebiten example - hue</title>
<style>
body {
font-family: sans-serif;
}
iframe {
border-color: #999;
border-style: solid;
border-width: 1px;
overflow: hidden;
}
pre {
background: #eee;
padding: 1em;
}
</style>
<nav><a href="..">Ebiten</a></nav>
<h1>Ebiten example - hue</h1>
<iframe src="hue.content.html" width="640" height="480"></iframe>
<pre><code>package main
import (
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;math&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/examples/common&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
gophersImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
count&#43;&#43;
w, h := gophersImage.Size()
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
op.ColorM.RotateHue(float64(count%360) * 2 * math.Pi / 360)
if err := screen.DrawImage(gophersImage, op); err != nil {
return err
}
return nil
}
func main() {
var err error
gophersImage, _, err = common.AssetImage(&#34;gophers.jpg&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Hue (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
<footer>© 2013 Hajime Hoshi</footer>