mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
125 lines
4.4 KiB
HTML
125 lines
4.4 KiB
HTML
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<!DOCTYPE html>
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<meta charset="utf-8">
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<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/mandelbrot.png">
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<meta name="description" content="Ebiten example - mandelbrot">
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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 - mandelbrot</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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<nav class="navbar"><div class="container">
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<nav class="d-flex flex-row" style="width: 100%;">
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<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
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<ul class="nav">
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
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<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>
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</ul>
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</nav>
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</div></nav>
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<main><div class="container">
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<h2>Ebiten example - mandelbrot</h2>
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<iframe src="mandelbrot.content.html" width="640" height="640"></iframe>
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<div class="card"><pre class="card-body"><code class="language-go">// +build example
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package main
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import (
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"log"
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"math"
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"github.com/hajimehoshi/ebiten"
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)
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const (
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screenWidth = 640
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screenHeight = 640
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maxIt = 128
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)
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var (
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offscreen *ebiten.Image
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offscreenPix []byte
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palette [maxIt]byte
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)
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func init() {
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offscreen, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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offscreenPix = make([]byte, screenWidth*screenHeight*4)
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for i := range palette {
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palette[i] = byte(math.Sqrt(float64(i)/float64(len(palette))) * 0x80)
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}
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}
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func color(it int) (r, g, b byte) {
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if it == maxIt {
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return 0xff, 0xff, 0xff
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}
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c := palette[it]
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return c, c, c
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}
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func updateOffscreen(centerX, centerY, size float64) {
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for j := 0; j < screenHeight; j++ {
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for i := 0; i < screenHeight; i++ {
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x := float64(i)*size/screenWidth - size/2 + centerX
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y := (screenHeight-float64(j))*size/screenHeight - size/2 + centerY
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c := complex(x, y)
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z := complex(0, 0)
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it := 0
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for ; it < maxIt; it++ {
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z = z*z + c
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if real(z)*real(z)+imag(z)*imag(z) > 4 {
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break
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}
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}
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r, g, b := color(it)
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p := 4 * (i + j*screenWidth)
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offscreenPix[p] = r
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offscreenPix[p+1] = g
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offscreenPix[p+2] = b
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offscreenPix[p+3] = 0xff
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}
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}
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offscreen.ReplacePixels(offscreenPix)
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}
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func init() {
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// Now it is not feasible to call updateOffscreen every frame due to performance.
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updateOffscreen(-0.75, 0.25, 2)
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}
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func update(screen *ebiten.Image) error {
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if ebiten.IsRunningSlowly() {
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return nil
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}
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screen.DrawImage(offscreen, nil)
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return nil
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}
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func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Mandelbrot (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></div>
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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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