mirror of
https://github.com/hajimehoshi/ebiten.git
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218 lines
6.6 KiB
HTML
218 lines
6.6 KiB
HTML
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<!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 - 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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<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 - life</h2>
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<iframe src="life.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"
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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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var (
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randSource = rand.NewSource(time.Now().UnixNano())
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rnd = rand.New(randSource)
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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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// NewWorld creates a new world
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func NewWorld(width, height int) *World {
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world := World{}
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world.area = makeArea(width, height)
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return &world
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}
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// RandomSeed inits world with a random state
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func (w *World) RandomSeed(limit 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 < limit; i++ {
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x := rnd.Intn(width)
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y := rnd.Intn(height)
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w.area[y][x] = true
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}
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}
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// Progress game state by one tick
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func (w *World) Progress() {
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height := len(w.area)
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width := len(w.area[0])
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next := makeArea(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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// DrawImage paints current game state
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func (w *World) DrawImage(img *image.RGBA) {
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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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pos := 4*y*width + 4*x
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if w.area[y][x] {
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img.Pix[pos] = 0xff
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img.Pix[pos+1] = 0xff
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img.Pix[pos+2] = 0xff
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img.Pix[pos+3] = 0xff
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} else {
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img.Pix[pos] = 0
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img.Pix[pos+1] = 0
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img.Pix[pos+2] = 0
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img.Pix[pos+3] = 0
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}
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}
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}
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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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height := len(a)
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width := len(a[0])
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lowX := 0
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if x > 0 {
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lowX = x - 1
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}
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lowY := 0
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if y > 0 {
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lowY = y - 1
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}
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highX := width - 1
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if x < width-1 {
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highX = x + 1
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}
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highY := height - 1
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if y < height-1 {
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highY = y + 1
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}
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near := 0
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for pY := lowY; pY <= highY; pY++ {
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for pX := lowX; pX <= highX; pX++ {
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if !(pX == x && pY == y) && a[pY][pX] {
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near++
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}
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}
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}
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return near
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}
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func makeArea(width, height int) [][]bool {
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area := make([][]bool, height)
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for i := 0; i < height; i++ {
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area[i] = make([]bool, width)
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}
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return area
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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 *World
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noiseImage *image.RGBA
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)
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func update(screen *ebiten.Image) error {
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world.Progress()
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world.DrawImage(noiseImage)
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if err := screen.ReplacePixels(noiseImage.Pix); err != nil {
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return err
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}
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return nil
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}
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func main() {
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population := int((screenWidth * screenHeight) / 10)
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scale := 2.0
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world = NewWorld(screenWidth, screenHeight)
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world.RandomSeed(population)
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noiseImage = image.NewRGBA(image.Rect(0, 0, screenWidth, screenHeight))
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if err := ebiten.Run(update, screenWidth, screenHeight, scale, "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>
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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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