mirror of
https://github.com/hajimehoshi/ebiten.git
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211 lines
6.8 KiB
HTML
211 lines
6.8 KiB
HTML
<!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/life.png">
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<meta name="description" content="Ebiten example - life">
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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 - life</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 - life</h2>
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<iframe src="life.content.html" width="640" height="480"></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/rand"
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"time"
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"github.com/hajimehoshi/ebiten"
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)
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// World represents the game state.
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type World struct {
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area [][]bool
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}
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func newArea(width, height int) [][]bool {
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a := make([][]bool, height)
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for i := 0; i < height; i++ {
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a[i] = make([]bool, width)
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}
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return a
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}
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// NewWorld creates a new world.
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func NewWorld(width, height int, maxInitLiveCells int) *World {
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w := &World{
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area: newArea(width, height),
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}
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w.init(maxInitLiveCells)
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return w
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}
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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// init inits world with a random state.
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func (w *World) init(maxLiveCells int) {
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height := len(w.area)
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width := len(w.area[0])
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for i := 0; i < maxLiveCells; i++ {
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x := rand.Intn(width)
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y := rand.Intn(height)
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w.area[y][x] = true
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}
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}
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// Update game state by one tick.
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func (w *World) Update() {
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height := len(w.area)
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width := len(w.area[0])
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next := newArea(width, height)
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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pop := neighbourCount(w.area, x, y)
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switch {
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case pop < 2:
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// rule 1. Any live cell with fewer than two live neighbours
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// dies, as if caused by under-population.
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next[y][x] = false
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case (pop == 2 || pop == 3) && w.area[y][x]:
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// rule 2. Any live cell with two or three live neighbours
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// lives on to the next generation.
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next[y][x] = true
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case pop > 3:
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// rule 3. Any live cell with more than three live neighbours
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// dies, as if by over-population.
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next[y][x] = false
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case pop == 3:
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// rule 4. Any dead cell with exactly three live neighbours
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// becomes a live cell, as if by reproduction.
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next[y][x] = true
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}
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}
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}
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w.area = next
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}
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// Draw paints current game state.
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func (w *World) Draw(pix []byte) {
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height := len(w.area)
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width := len(w.area[0])
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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idx := 4*y*width + 4*x
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if w.area[y][x] {
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pix[idx] = 0xff
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pix[idx+1] = 0xff
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pix[idx+2] = 0xff
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pix[idx+3] = 0xff
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} else {
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pix[idx] = 0
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pix[idx+1] = 0
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pix[idx+2] = 0
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pix[idx+3] = 0
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}
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}
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}
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}
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func max(a, b int) int {
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if a < b {
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return b
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}
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return a
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}
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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// neighbourCount calculates the Moore neighborhood of (x, y).
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func neighbourCount(a [][]bool, x, y int) int {
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w := len(a[0])
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h := len(a)
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minI := max(x-1, 0)
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minJ := max(y-1, 0)
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maxI := min(x+1, w-1)
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maxJ := min(y+1, h-1)
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c := 0
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for j := minJ; j <= maxJ; j++ {
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for i := minI; i <= maxI; i++ {
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if i == x && j == y {
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continue
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}
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if a[j][i] {
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c++
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}
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}
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}
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return c
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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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world = NewWorld(screenWidth, screenHeight, int((screenWidth*screenHeight)/10))
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pixels = make([]byte, screenWidth*screenHeight*4)
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)
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func update(screen *ebiten.Image) error {
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world.Update()
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if ebiten.IsRunningSlowly() {
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return nil
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}
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world.Draw(pixels)
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screen.ReplacePixels(pixels)
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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, 2, "Game of Life (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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