forked from: forked from: forked from: forked from: flash on 2009-12-3

/**
 * Copyright terra1119 ( http://wonderfl.net/user/terra1119 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/q9gO
 */

// forked from terra1119's forked from: forked from: forked from: flash on 2009-12-3
// forked from terra1119's forked from: forked from: flash on 2009-12-3
// forked from terra1119's forked from: flash on 2009-12-3
// forked from terra1119's flash on 2009-12-3
package {
	import flash.display.Sprite;
	import flash.events.Event;

	public class Spring1 extends Sprite {
		
		private var ball:Ball;
		private var spring:Number = 0.1;
		private var targetX:Number = stage.stageWidth / 2;
		private var targetY:Number = stage.stageHeight / 2;
		private var vx:Number = 50;
		private var vy:Number = 0;
		private var friction:Number = 0.95;
		private var gravity:Number = 5;
		
		public function Spring1() {
			init();
		}
		
		private function init():void
		{
			ball = new Ball();
			addChild(ball);
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		
		private function onEnterFrame(e:Event):void 
		{
			var dx:Number = mouseX - ball.x;
			var dy:Number = mouseY - ball.y;
			var ax:Number = dx * spring;
			var ay:Number = dy * spring;
			vx += ax;
			vy += ay;
			vy += gravity;
			vx *= friction;
			vy *= friction;
			ball.x += vx;
			ball.y += vy;
			graphics.clear();
			graphics.lineStyle(1);
			graphics.moveTo(ball.x, ball.y);
			graphics.lineTo(mouseX, mouseY);
		}
		
    }
}
import flash.display.Sprite;
class Ball extends Sprite {
	public var radius:Number;
	public var color:uint;
	public var vx:Number;
	public var vy:Number;
	
	public function Ball(radius:Number=40,color:uint=0xff0000){
		this.radius = radius;
		this.color = color;
		init();
	}
		
	private function init():void{
		graphics.beginFill(color);
		graphics.drawCircle(0, 0, radius);
		graphics.endFill();
	}
}