mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
203 lines
6.8 KiB
HTML
203 lines
6.8 KiB
HTML
<!DOCTYPE html>
|
|
<meta charset="utf-8">
|
|
<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/life.png">
|
|
<meta name="description" content="Ebiten example - life">
|
|
<link rel="shortcut icon" href="../favicon.png" type="image/png" >
|
|
<link rel="icon" href="../favicon.png" type="image/png" >
|
|
<title>Ebiten example - life</title>
|
|
|
|
<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
|
|
<link rel="stylesheet" href="../stylesheets/highlight-github.css">
|
|
<link rel="stylesheet" href="../stylesheets/ebiten.css">
|
|
<script src="../scripts/googleanalytics.js"></script>
|
|
|
|
<nav class="navbar"><div class="container">
|
|
<nav class="d-flex flex-row" style="width: 100%;">
|
|
<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
|
|
<ul class="nav">
|
|
<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
|
|
<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
|
|
<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
|
|
<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>
|
|
</ul>
|
|
</nav>
|
|
</div></nav>
|
|
|
|
<main><div class="container">
|
|
|
|
<h2>Ebiten example - life</h2>
|
|
<iframe src="life.content.html" width="640" height="480"></iframe>
|
|
<div class="card"><pre class="card-body"><code class="language-go">// +build example
|
|
|
|
package main
|
|
|
|
import (
|
|
"log"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
)
|
|
|
|
// World represents the game state
|
|
type World struct {
|
|
area [][]bool
|
|
rnd *rand.Rand
|
|
}
|
|
|
|
// NewWorld creates a new world
|
|
func NewWorld(width, height int) *World {
|
|
world := World{
|
|
area: makeArea(width, height),
|
|
rnd: rand.New(rand.NewSource(time.Now().UnixNano())),
|
|
}
|
|
return &world
|
|
}
|
|
|
|
// RandomSeed inits world with a random state
|
|
func (w *World) RandomSeed(limit int) {
|
|
height := len(w.area)
|
|
width := len(w.area[0])
|
|
for i := 0; i < limit; i++ {
|
|
x := w.rnd.Intn(width)
|
|
y := w.rnd.Intn(height)
|
|
w.area[y][x] = true
|
|
}
|
|
}
|
|
|
|
// Progress game state by one tick
|
|
func (w *World) Progress() {
|
|
height := len(w.area)
|
|
width := len(w.area[0])
|
|
next := makeArea(width, height)
|
|
for y := 0; y < height; y++ {
|
|
for x := 0; x < width; x++ {
|
|
|
|
pop := neighbourCount(w.area, x, y)
|
|
switch {
|
|
case pop < 2:
|
|
// rule 1. Any live cell with fewer than two live neighbours
|
|
// dies, as if caused by under-population.
|
|
next[y][x] = false
|
|
|
|
case (pop == 2 || pop == 3) && w.area[y][x]:
|
|
// rule 2. Any live cell with two or three live neighbours
|
|
// lives on to the next generation.
|
|
next[y][x] = true
|
|
|
|
case pop > 3:
|
|
// rule 3. Any live cell with more than three live neighbours
|
|
// dies, as if by over-population.
|
|
next[y][x] = false
|
|
|
|
case pop == 3:
|
|
// rule 4. Any dead cell with exactly three live neighbours
|
|
// becomes a live cell, as if by reproduction.
|
|
next[y][x] = true
|
|
}
|
|
}
|
|
}
|
|
w.area = next
|
|
}
|
|
|
|
// DrawImage paints current game state
|
|
func (w *World) DrawImage(pix []uint8) {
|
|
height := len(w.area)
|
|
width := len(w.area[0])
|
|
for y := 0; y < height; y++ {
|
|
for x := 0; x < width; x++ {
|
|
pos := 4*y*width + 4*x
|
|
if w.area[y][x] {
|
|
pix[pos] = 0xff
|
|
pix[pos+1] = 0xff
|
|
pix[pos+2] = 0xff
|
|
pix[pos+3] = 0xff
|
|
} else {
|
|
pix[pos] = 0
|
|
pix[pos+1] = 0
|
|
pix[pos+2] = 0
|
|
pix[pos+3] = 0
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// neighbourCount calculates the Moore neighborhood of x, y
|
|
func neighbourCount(a [][]bool, x, y int) int {
|
|
height := len(a)
|
|
width := len(a[0])
|
|
lowX := 0
|
|
if x > 0 {
|
|
lowX = x - 1
|
|
}
|
|
lowY := 0
|
|
if y > 0 {
|
|
lowY = y - 1
|
|
}
|
|
highX := width - 1
|
|
if x < width-1 {
|
|
highX = x + 1
|
|
}
|
|
highY := height - 1
|
|
if y < height-1 {
|
|
highY = y + 1
|
|
}
|
|
near := 0
|
|
for pY := lowY; pY <= highY; pY++ {
|
|
for pX := lowX; pX <= highX; pX++ {
|
|
if !(pX == x && pY == y) && a[pY][pX] {
|
|
near++
|
|
}
|
|
}
|
|
}
|
|
|
|
return near
|
|
}
|
|
|
|
func makeArea(width, height int) [][]bool {
|
|
area := make([][]bool, height)
|
|
for i := 0; i < height; i++ {
|
|
area[i] = make([]bool, width)
|
|
}
|
|
return area
|
|
}
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
world = NewWorld(screenWidth, screenHeight)
|
|
pixels = make([]uint8, screenWidth*screenHeight*4)
|
|
)
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
world.Progress()
|
|
if ebiten.IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
world.DrawImage(pixels)
|
|
screen.ReplacePixels(pixels)
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
world.RandomSeed(int((screenWidth * screenHeight) / 10))
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2.0, "Game of Life (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
</code></pre></div>
|
|
|
|
</div></main>
|
|
|
|
<footer><div class="container">
|
|
<p>© 2013 Hajime Hoshi</p>
|
|
<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
|
|
<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>
|
|
</div></footer>
|
|
|
|
<script src="../scripts/highlight.pack.js"></script>
|
|
<script>hljs.initHighlightingOnLoad();</script>
|