[SWF(width=500, height=500)]
var canvasSize:int=stage.stageWidth;
var canvas:BitmapData=new BitmapData(canvasSize,canvasSize,false,0x000001);
addChild(new Bitmap(canvas, "auto", true));
var size:int=canvas.width*canvas.height - canvasSize;
var pixels:Vector.<uint>=canvas.getVector(canvas.rect);
for (var i:int = 0; i<canvasSize; i++) {
var xp:int=int(Math.random()*canvasSize);
var yp:int=int(Math.random()*canvasSize);
pixels[xp+yp*canvasSize]=0xFF000000;
}
var targetCol:uint=0xFF000000;
var buffer:Vector.<uint>=pixels.concat();
var fade:uint=1;
addEventListener(Event.ENTER_FRAME, onLoop);
function onLoop(evt:Event):void {
var curr:uint=targetCol;
var r:int = (curr >> 16) & 0xFF;
var g:int = (curr >> 8) & 0xFF;
var b:int=curr&0xFF;
r+=fade;
g+=fade;
b+=fade;
if (r>255) r=255;
if (g>255) g=255;
if (b>255) b=255;
var darker:uint=0xFF000000|r<<16|g<<8|b;
if (darker==0xFFFFFFFF) {
removeEventListener(Event.ENTER_FRAME, onLoop);
}
for (var i:int = canvasSize; i<size; i++) {
curr=pixels[i];
if (curr==targetCol) {
var index:int=i-canvasSize+int(Math.random()*3) - 1;
if (index>0) buffer[index]=darker;
if (int(Math.random()*50)==1) {
index=i-canvasSize+int(Math.random()*3)-1;
if (index>0) buffer[index]=darker;
}
}
}
targetCol=darker;
canvas.lock();
canvas.setVector(canvas.rect, buffer);
pixels=buffer.concat();
canvas.unlock();
}
This snippet uses setVector() to draw something that looks like this:
This is a cellular automaton. It has kind of a strange rule set – but you could easily use this snippet to do more traditional cellular automata.
