forked from: RandomWalk

/**
 * Copyright wwbeyondww1 ( http://wonderfl.net/user/wwbeyondww1 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/2lUs
 */

// forked from Ricki_G's RandomWalk
//playing around with something Zevan Rosser from http://actionsnippet.com/?p=1236 did
//on his blog

package {
    
    import flash.display.*;
    import flash.events.*;
    
    [SWF( width="512", height = "512", backgroundColor = "0x222222", frameRate = "30" )]
    
    public class RandomWalk extends Sprite 
    {
        
        private var _canvas:BitmapData;
        private var _count:int = 100;
        private var _movers:Vector.<Mover>;
        
        public function RandomWalk()
        {
            var w:Number = 512;
            var h:Number = 512;
            scaleX=scaleY = 0.25;
            _canvas = new BitmapData( w * 4, h * 4, false, 0x222222 );
            addChild( new Bitmap( _canvas ));
            
            _movers = new Vector.<Mover>();
            
            for ( var i:int = 0; i < _count; i++ ) 
            {
                _movers[ i ] = new Mover( _canvas, w * 1.5 + Math.random() * w, h * 1.5 + Math.random() * h );
            }
            addEventListener( Event.ENTER_FRAME, onRun );
        }
        private function onRun( evt:Event ):void 
        {
            for (var i:int = 0; i < 200; i++) 
            {
                for (var j:int = 0; j < _count; j++) 
                {
                    _movers[ j ].run();
                }
            }
        }
    }
}

import flash.display.BitmapData;
class Mover 
{
    public var x:Number;
    public var y:Number;
    public var velX:Number;
    public var velY:Number;
    public var speed:Number;
    private var _canvas:BitmapData;
    private var _color:uint;
    
    public function Mover( canvas:BitmapData, xp:Number, yp:Number ) 
    {
        _color = Math.random() * 0xFFFFFF;
        _canvas = canvas;
        x = xp;
        y = yp;
        velX = 0;
        velY = 0;
        speed=Math.random() * 5 - 2.5;
    }
    
    public function run():void 
    {
        x += velX;
        y += velY;
        _canvas.setPixel( x, y, _color );
        
        var dir:Number = int( Math.random() * 4 );
        
        if (dir == 0) 
        {
            velX = 0;
            velY =- speed;
        } 
        else if (dir == 1) 
        {
            velX = 0;
            velY = speed;
        } 
        else if (dir == 2) 
        {
            velX =- speed;
            velY = 0;
        } 
        else if (dir == 3) 
        {
            velX = speed;
            velY = 0;
        }
    }
}