Bubbles

by crossisland 25 Feb 2012

Tags

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

package {
    import flash.display.Sprite;
    import flash.events.Event;
    
    public class Bubbles 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 Bubbles() {
            init();
        }
        
        private function init():void {
            balls = new Array();
            centerBall = new Ball(60, 0x000000);
            addChild(centerBall);
            centerBall.x = stage.stageWidth / 2;
            centerBall.y = stage.stageHeight / 2;
            
            for (var i:uint = 0; i < numBalls; i++) {
                var ball:Ball = new Ball(Math.random() * 20 + 10, Math.random() * 0x000000);
                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(event:Event):void {
            for (var i:uint = 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 targetX:Number = centerBall.x + Math.cos(angle) * minDist;
                    var targetY:Number = centerBall.y + Math.sin(angle) * minDist;
                    ball.vx += (targetX - ball.x) * spring;
                    ball.vy += (targetY - 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=0x000000) {
        this.radius = radius;
        this.color = color;
        init();
    }
    
    public function init():void {
        graphics.beginFill(color);
        graphics.drawCircle(0, 0, radius);
        graphics.endFill();
    }
}