package {

	import flash.display.*;
	import flash.events.Event;

	public class DrawTest {
		var canvas:Sprite;
		var tmpmc:MovieClip;
		var tmpno:Number=0;
		var oldtx:Number;
		var oldty:Number;
		var color:uint=0x666666;

		//
		public function DrawTest(targetmc:MovieClip) {
			tmpmc=targetmc;
			tmpmc.addEventListener(Event.ENTER_FRAME,enterFrameCaller);
		}
		public function enterFrameCaller(event:Event) {
			tmpno++;
			tx=tmpno;
			var tx:Number;
			var ty:Number;
			var r:Number=50;
			
			ty=(Math.sqrt(Math.abs(r*r)-((tx-50)*(tx-50))));

			canvas=new Sprite();
			//
			var alpha:Number=1.0;
			var thickness:uint=1;
			//
			var container:DisplayObjectContainer=tmpmc.root as DisplayObjectContainer;
			canvas.graphics.lineStyle(thickness,color,alpha);
			if (isNaN(oldtx)) {
				canvas.graphics.moveTo(tx,ty);
			} else {
				canvas.graphics.moveTo(oldtx,oldty);
			}
			canvas.graphics.lineTo(tx,ty);
			container.addChild(canvas);
			oldtx=tx;
			oldty=ty;

			if (tmpno>300) {
				tmpmc.removeEventListener(Event.ENTER_FRAME,enterFrameCaller);
			}
		}
	}
}