[]路径显示会添加DrawCall，每增加一条路径都会添加，有什么办法降DrawCall

package

{

	

	import laya.display.Node;

	import laya.display.Sprite;

	import laya.maths.Rectangle;

	import laya.ui.Dialog;

	import laya.ui.Image;

	import laya.utils.Handler;

	

	import ui.TestDialogUI;

	import ui.TestViewUI;

	

	public class TestView extends TestViewUI

	{

		private var PATH_LEN:Number = 120.0;

		private var speed:Number = 15;

		

		private var _path:Sprite = new Sprite();

		private var _path2:Sprite = new Sprite();

		private var arr:Array = ;



		private var arr2:Array = ;

		private var pop:TestDialogUI;

		public function TestView()

		{

			super();

			_path.pivot(0,0);

			_path.pos(a.x,a.y);

			this.addChild(_path);

			_path.rotation = Math.atan2(b.y - a.y, b.x - a.x) / Math.PI * 180;



			_path2.rotation = Math.atan2(b.y - a.y+300, b.x - a.x) / Math.PI * 180;

			_path2.pos(a.x,a.y);

			this.addChild(_path2);

			var len:int = Math.floor(GetPathLen()/PATH_LEN)+2;

			

			SetPathArr(arr,_path);

			SetPathArr(arr2,_path2);

			//注释下面这行就正常了

			_path.scrollRect = new Rectangle(0,0,(len-3)*PATH_LEN-30,58);

			_path2.scrollRect = new Rectangle(0,0,(len-3)*PATH_LEN-30,58);

			//_path.viewPort = new Rectangle(0,0,(len-3)*PATH_LEN-30,58);

			btn_start.clickHandler = new Handler(this,StartMove,[len]);

			add_other.clickHandler = new Handler(this,OnShow);

//			aa.dataSource = {text:"mmmm"};



			for(var i:int = 0;i<100;i++){

				var img:Image = TestScrollImage();

				img.pos(100+i*10,100+i+10);

				this.addChild(img);

			}

		}





		private function TestScrollImage():Image{

			var img:Image = new Image("comp/image.png");

			img.scrollRect = new Rectangle(0,0,100,100);

			return img;

		}





		private function SetPathArr(ar:Array,path:Sprite):void{

			var len:int = Math.floor(GetPathLen()/PATH_LEN)+2;

			var p:Image;

			for(var i:int = 0;i<len;i++){

				p = new Image("test/footprint.png");

				p.pos((i-1)*PATH_LEN,0);

				ar.push(p);

				path.addChild(p);



			}

		}

		

		private function OnShow():void

		{

			// TODO Auto Generated method stub

			if(pop==null){

				pop = new TestDialogUI();

				pop.btn_close.clickHandler = new Handler(this,function(){pop.parent.removeChild(pop);});

			}

			this.addChild(pop);

		}

		

		private function StartMove(len:int):void

		{

			trace("[TestView.StartMove]")

			// TODO Auto Generated method stub

			Laya.timer.loop(100,this,UpdatePath,[len]);

		}

		

		private function UpdatePath(len:int):void

		{

			// TODO Auto Generated method stub

			var show:int = len -1;

			for(var i=0;i<len;i++){

				if(arr[i]){

					arr[i].x+= speed;

					if(arr[i].x>= (show-1)* PATH_LEN){

						arr[i].x-=show* PATH_LEN;

					}

				}

				if(arr2[i]){

					arr2[i].x+=speed;

					if(arr2[i].x>=(show-1)* PATH_LEN){

						arr2[i].x-=show* PATH_LEN;

					}

				}

			}

			// _path.scrollRect = new Rectangle(PATH_LEN,0,(len-3)*PATH_LEN-30,58);

			// _path2.scrollRect = new Rectangle(PATH_LEN,0,(len-3)*PATH_LEN-30,58);

		}

		

		private function GetPathLen():Number

		{

			// TODO Auto Generated method stub

			var disX:Number = a.x-b.x;

			var disY:Number = a.y-b.y; 

			var p:Number = Math.sqrt(disX*disX+disY*disY);

			return p;

		}		

		

		

		

	}

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