package org.papervision3d.core.utils{	import flash.events.EventDispatcher;	import flash.utils.getTimer;	public class StopWatch extends EventDispatcher	{		private var startTime:int;		private var stopTime:int;		private var elapsedTime:int;		private var isRunning:Boolean;				public function StopWatch()		{			super();		}				public function start():void		{			if(!isRunning){				startTime = getTimer();				isRunning = true;			}		}				public function stop():int		{			if(isRunning){				stopTime = getTimer();				elapsedTime = stopTime-startTime;				isRunning = false;				return elapsedTime;			}else{				return 0;			}		}				public function reset():void		{			isRunning = false;		}		}}