Langton's Ants

old school fun with BitmapData

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favorite:2
lines:92
license : MIT License
modified : 2012-08-17 06:10:08

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package 
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.events.Event;
    
    [SWF(     
        height = "600",
        width = "600",
        framerate = "50",
        backgroundColor = "0x000000"
    )]
    
    /**
     * ...
     * @author milchreis
     */
    public class Main extends Sprite 
    {
        private static const ANT_COUNT:uint = 7; //number of ants in one row
        private static const SIZE:uint = 200; //initial size of bitmap, will be scaled up (2x)
        
        private var _bm:Bitmap;
        private var _bmd:BitmapData;
        private var _hive:Array;
        
        
        public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            
            _hive = [];
            
            _bmd = new BitmapData(SIZE, SIZE, false, 0x000000);
            _bm = new Bitmap(_bmd);
            _bm.scaleX = _bm.scaleY = Math.min(stage.stageHeight, stage.stageWidth)/SIZE;
            addChild(_bm);
            
            for (var j:uint = 0; j < ANT_COUNT; j++) for (var i:uint = 0; i < ANT_COUNT; i++)
            {
                _hive.push(new Ant(_bmd, SIZE /2 /ANT_COUNT + SIZE /ANT_COUNT * j, SIZE /2 /ANT_COUNT + SIZE /ANT_COUNT * i, 0xffffff * Math.random()));
            }
            
            addEventListener(Event.ENTER_FRAME, loop);
            
        }
        
        private function loop(e:Event):void
        {
            _bmd.lock()
            
            for each (var ant:Ant in _hive) ant.update();
            
            _bmd.unlock();
        }

}
}

import flash.display.BitmapData;

internal class Ant
{
        private var _hole:BitmapData;
        
        private var _direction:uint, _x:uint, _y:uint, _color:uint;
        
        public function Ant(bitmapdata:BitmapData, x:uint = 0, y:uint = 0, color:uint = 0xffff00) 
        {
            _x = x;
            _y = y;
            _color = color;
            _hole = bitmapdata;
            _direction = Math.ceil(Math.random()*4);
        }
        public function update():void
        {
            // this is how the langton algorithm works, setting/unsetting pixels and changing direction.
            if (_hole.getPixel(_x, _y) == 0)
            {
                _hole.setPixel(_x, _y, _color);
                _direction += 1;
            }
            else 
            {
                _hole.setPixel(_x, _y, 0);
                _direction -= 1;
            }
            
            //making sure that we only have 4 directions and cycle through them
            if (_direction > 4)
            {
                _direction = 1;
            }
            else if (_direction < 1)
            {
                _direction = 4;
            }
            //this moves the ant and projects the bitmapData on a torus, this way, no ant can be lost. =)
            switch(_direction)
            {
                case 1: _y = (_y == 0) ? _hole.height-1 : (_y - 1); 
                break;
                case 2: _x = (_x == _hole.width-1) ? 0 : (_x + 1); 
                break; 
                case 3: _y = (_y == _hole.height-1) ? 0 : (_y + 1); 
                break;
                case 4: _x = (_x == 0) ? _hole.width-1 : (_x - 1); 
                break;
            }
            
        }
}

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