forked from: forked from: base

/**
 * Copyright _wonder ( http://wonderfl.net/user/_wonder )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/w2Hv
 */

// forked from _wonder's forked from: base
// forked from _wonder's base
package {
    import flash.display.Sprite;
    import flash.events.Event;
    
    public class FlashTest extends Sprite {
    		private var balls:Array;
    		private var numBalls:Number = 10;
    		private var centerBall:Ball;
    		private var bounce:Number = -1;
    		private var spring:Number = 0.2;
    		
        public function FlashTest() {
            init();
        }
        
        private function init():void{
        		balls = new Array();
        		centerBall = new Ball(100,0xcccccc);
        		addChild( centerBall );
        		centerBall.x = stage.stageWidth / 2;
        		centerBall.y = stage.stageHeight / 2;
        		
        		for( var i:int=0; i < numBalls; i++ ){
        			var ball:Ball = new Ball(Math.random()*40+5, Math.random() * 0xffffff);
        			ball.x = Math.random() * stage.stageWidth;
        			ball.y = Math.random() * stage.stageHeight;
        			ball.vx = Math.random() * 6-3;
        			ball.vy = Math.random() * 6-3;
        			addChild( ball );
        			balls.push( ball );
        		}
        		
        		addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        private function onEnterFrame(e:Event):void {
        		for( var i:int=0; i < numBalls; i++ ){
        			var ball:Ball = balls[i];
        			move(ball);
        			
        			var dx:Number = ball.x - centerBall.x;
        			var dy:Number = ball.y - centerBall.y;
        			var dist:Number = Math.sqrt(dx*dx + dy*dy);
        			var minDist:Number = ball.radius + centerBall.radius;
        			
        			if( dist < minDist ){
        				var angle:Number = Math.atan2( dy,dx );
        				var tx:Number = centerBall.x + Math.cos( angle ) * minDist;
        				var ty:Number = centerBall.y + Math.sin( angle ) * minDist;
        				ball.vx +=( tx - ball.x ) * spring;
        				ball.vy +=( ty - ball.y ) * spring;
        			}
        		}
        }
        
        private function move(ball:Ball):void{
        		ball.x += ball.vx;
        		ball.y += ball.vy;
        		if( ball.x + ball.radius > stage.stageWidth ){
        			ball.x = stage.stageWidth - ball.radius;
        			ball.vx *= bounce;
        		} else if( ball.x - ball.radius < 0 ){
        			ball.x = ball.radius;
        			ball.vx *= bounce;
        		}
        		
        		if( ball.y + ball.radius > stage.stageHeight ){
        			ball.y = stage.stageHeight - ball.radius;
        			ball.vy *= bounce;
        		} else if( ball.y - ball.radius < 0 ){
        			ball.y = ball.radius;
        			ball.vy *= bounce;
        		}
        }
    }
}

import flash.display.Sprite;

class Ball extends Sprite {
	public var radius:Number;
	public var color:uint;
	public var vx:Number = 0;
	public var vy:Number = 0;
	
	public function Ball(radius:Number=40, color:uint=0Xff0000){
		this.radius = radius;
		this.color = color;
		init();
	}
	
	public function init():void {
		graphics.beginFill(color);
		graphics.drawCircle(0, 0, radius);
		graphics.endFill();
	}
}