package {
	import flash.display.*;
	import flash.text.*;
	import flash.events.*;
	
	public class MyAnimation extends MovieClip {
		
		// Properties
		var myCircle:Sprite;
		var moveX:Number = 10;
		var moveY:Number = 10;

		// Constructor
		public function MyAnimation() {
			myCircle = new Sprite();
			myCircle.graphics.lineStyle(5,0x000000);
			myCircle.graphics.beginFill(0xCCCCCC);
			myCircle.graphics.drawCircle(0,0,25);
			addChild(myCircle);
			
			myCircle.x = 100;
			myCircle.y = 150;
			
			addEventListener(Event.ENTER_FRAME, moveCircle);
		}


		// Methods
		public function moveCircle(e:Event):void{
			 if(myCircle.x > stage.stageWidth ||  myCircle.x < 0){
			        moveX = -moveX;  //change direction
			    }     
			 if(myCircle.y > stage.stageHeight ||  myCircle.y < 0){
			        moveY = -moveY;  //change direction
			    }    

			myCircle.x = myCircle.x + moveX;
			myCircle.y = myCircle.y + moveY;
		}


	}
}