Line Following Mouse

Question

HiActually I already have a class that does this exact thing you can enjoy it here - http://megaswf.com/serve/1154775if you play around with it you will notice that the frame rate drops significantly when you move the mouse fast for a long time,especially if you add more objects and logic to the game (press space and see what happens )my question is how can I make this efficiant and not affect the frame rate.heres the code:package  
{
     import adobe.utils.ProductManager;
     import flash.display.DisplayObject;
     import flash.display.DisplayObjectContainer;
     import flash.display.MovieClip;
     import flash.display.Sprite;
     import flash.events.Event;
     import flash.events.MouseEvent;
     import flash.geom.Point;
     /**
      * ...
      * @7111211 Gadi G
      */
     public class MouseHandler extends Sprite
     {
          private  var _stage:DisplayObjectContainer;
          public var _bDraw:Boolean = false;
          private var _arrLine:Array = new Array();;
          private var _angle;
          private var _p1:Point =  new Point();
          private var _p2:Point = new Point();
          private var cos:Number;
          private var sin:Number;
          private var lineDrawing:Line;
          private var angle;
          private var distance:uint;
          private static var instance:MouseHandler;
          public var _mousePos:Point = new Point();
          
          public function MouseHandler() 
          {
          }
          
          public static function getInstance():MouseHandler
          {
               if (instance == null)
               {
                    instance = new MouseHandler();
               }
               
               return instance;
          }
          
          public function startListening(prnt:DisplayObjectContainer)
          {
               _stage = prnt;
               _stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
               _stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
          }
          
          private function mouseDownHandler(e:MouseEvent):void
          {
               _bDraw = true;
               _p2.x = mouseX;
               _p2.y = mouseY;
               _stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
               _stage.addEventListener(MouseEvent.MOUSE_MOVE, drawMouseLine);
          }

private function mouseUpHandler(e:MouseEvent):void
          {
               _bDraw = false;
               _stage.removeEventListener(MouseEvent.MOUSE_MOVE, drawMouseLine);
          }
          
          private function enterFrameHandler(e:Event):void
          {
               for each (var s:Line in _arrLine)
               {
                    s.scaleX = s.scaleY *=  .79;
                    // the lowest possile value is one twip which is 0.05
                    if (s.width < .7)
                    {
                         _arrLine.splice(_arrLine.indexOf(s), 1);
                         _stage.removeChild(s);
                         s = null;
                    }
               }
               if (!_bDraw)
               {
                    //_mousePos = null;
                    
                    if (_arrLine.length == 0) 
                    {
                         _stage.removeEventListener(Event.ENTER_FRAME, enterFrameHandler);
                    }
               }
               
               _mousePos.x = mouseX;
               _mousePos.y = mouseY;
          }

private function drawMouseLine(e:MouseEvent):void
          {
               _p1.x = mouseX;
               _p1.y = mouseY;
               _angle = Math.atan2(_p1.y - _p2.y,_p1.x - _p2.x);
               var rot:Number = (180 / Math.PI ) * _angle + 180;
               cos = Math.cos(_angle);
               sin = Math.sin(_angle);
               distance = Math.round(Point.distance(_p1,_p2)) + 1;
               while (--distance)
               {
                    lineDrawing = new Line();
                    lineDrawing.x = _p2.x;
                    lineDrawing.y = _p2.y;
                    lineDrawing.rotation = rot;
                    _arrLine.push(_stage.addChild(lineDrawing));
                    lineDrawing = null;
                    _p2.x +=  cos;
                    _p2.y +=  sin;
               }
               _p2.x = _p1.x;
               _p2.y = _p1.y;
          }
     }

}Thanks

kglad · Answer

use:package { import adobe.utils.ProductManager; import flash.display.DisplayObject; import flash.display.DisplayObjectContainer; import flash.display.MovieClip; import flash.display.Sprite; import flash.events.Event; import flash.events.MouseEvent; import flash.geom.Point; /** * ... * @author Gadi G */ public class MouseHandler extends Sprite { private var _stage:DisplayObjectContainer; public var _bDraw:Boolean = false; private var _arrLine:Array = new Array();; private var _angle; private var _p1:Point = new Point(); private var _p2:Point = new Point(); private var cos:Number; private var sin:Number; private var lineDrawing:Line; private var angle; private var distance:uint; private static var instance:MouseHandler; public var _mousePos:Point = new Point();  public function MouseHandler()  { }  public static function getInstance():MouseHandler { if (instance == null) { instance = new MouseHandler(); }  return instance; }  public function startListening(prnt:DisplayObjectContainer) { _stage = prnt; _stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler); _stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler); }  private function mouseDownHandler(e:MouseEvent):void { _bDraw = true; _p2.x = mouseX; _p2.y = mouseY; _stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler); _stage.addEventListener(MouseEvent.MOUSE_MOVE, drawMouseLine); }  private function mouseUpHandler(e:MouseEvent):void { _bDraw = false; _stage.removeEventListener(MouseEvent.MOUSE_MOVE, drawMouseLine); }  private function enterFrameHandler(e:Event):void { for each (var i:int= _arrLine.length-1;i>=0;i--) {var s:Line=_arrLine; s.scaleX = s.scaleY *= .79; // the lowest possile value is one twip which is 0.05 if (s.width < .7) { _arrLine.splice(_arrLine.indexOf(s), 1); _stage.removeChild(s); s = null; } } if (!_bDraw) { //_mousePos = null;  if (_arrLine.length == 0)  { _stage.removeEventListener(Event.ENTER_FRAME, enterFrameHandler); } }  _mousePos.x = mouseX; _mousePos.y = mouseY; }  private function drawMouseLine(e:MouseEvent):void { _p1.x = mouseX; _p1.y = mouseY; _angle = Math.atan2(_p1.y - _p2.y,_p1.x - _p2.x); var rot:Number = (180 / Math.PI ) * _angle + 180; cos = Math.cos(_angle); sin = Math.sin(_angle); distance = Math.round(Point.distance(_p1,_p2)) + 1; while (--distance) { lineDrawing = new Line(); lineDrawing.x = _p2.x; lineDrawing.y = _p2.y; lineDrawing.rotation = rot;_stage.addChild(lineDrawing) _arrLine.push(lineDrawing); lineDrawing = null; _p2.x += cos; _p2.y += sin; } _p2.x = _p1.x; _p2.y = _p1.y; } } } Thanks

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