物体围绕另一个物体圆形运动

package 

{

	/*库中有两个元件Ball和Mc*/

	import flash.display.Sprite;

	import flash.events.Event;



	public class Circle extends Sprite

	{

		private var ball:Ball;

		private var mc:Mc;

		private var angle:Number = 0;

		private var centerX:Number = 200;

		private var centerY:Number = 200;

		private var radius:Number = 40;

		private var speed:Number = 0.1;



		public function Circle()

		{

			init();

		}



		private function init()

		{

			mc = new Mc  ;

			mc.x = centerX;

			mc.y = centerY;

			addChild(mc);

			ball = new Ball  ;

			ball.x = 0;

			addChild(ball);

			addEventListener(Event.ENTER_FRAME,onEnter);

		}



		public function onEnter(e:Event):void

		{

			ball.x = centerX + Math.sin(angle) * radius;

			ball.y = centerY + Math.cos(angle) * radius;

			angle +=  speed;



			var dx:Number = ball.x - mc.x;

			var dy:Number = ball.y - mc.y;

			var dis:Number = Math.sqrt(dx * dx + dy * dy);

			trace(dis);

			var radians:Number = Math.atan2(dy,dx);

			mc.rotation = radians * 180 / Math.PI;

			trace(mc.rotation);

		}



	}

}

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