[]如何用Tween 给graphics.drawLine 设置缓动

package 

{

	import laya.display.Sprite;



	public class LayaAirDemo

	{

		private var sp:Sprite;

		private var endX:Number;

		private var endY:Number;

		public function LayaAirDemo()

		{

			Laya.init(600,600);

			sp=new Sprite();

			Laya.stage.addChild(sp);

			endX=0;

			endY=0;

			sp.graphics.drawLine(10,10,endX,endY,'#FF0000');

			Laya.timer.frameLoop(1,this,onFrameLoop);

		}

		

		private function onFrameLoop():void

		{

			endX+=2;

			endY+=2;

			sp.graphics.drawLine(10,10,endX,endY,'#FF0000');

		}

	}	

}