forked from: さくらパーティクル

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

// forked from chieinoue's さくらパーティクル
package {
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;

    public class Main extends Sprite {
    
            public function Main(){    
            var base:Sprite = new Sprite();
            
            var fillType:String = GradientType.LINEAR;
            var colors:Array = [0xB4E7FA, 0xFFFFFF];
            var alphas:Array = [1, 1];
            var ratios:Array = [0x00, 0xFF];
            var matr:Matrix = new Matrix();
            var rotation:Number = Math.PI / 2;
            matr.createGradientBox(250, 450, rotation, 0, 0);
            var spreadMethod:String = SpreadMethod.PAD;
            base.graphics.beginGradientFill(fillType, colors, alphas, ratios, matr, spreadMethod);  
            base.graphics.drawRect(0,0,500,500);
            addChild(base);
            
            addEventListener(Event.ENTER_FRAME, function(event:Event):void{
                for(var i:int = 0; i < 15; i++){
                    var circle:Circle = new Circle();
                    base.addChild(circle);
                }
            });
            }
    }
}

import flash.display.Graphics;
import flash.display.Shape;
import flash.display.Sprite;
import com.flashdynamix.motion.*;
import fl.motion.easing.*;
import flash.events.*;

internal class Circle extends Sprite{

    public function Circle():void{
        var container:Sprite = new Sprite();        
        var child:Shape = new Shape();
        var size:uint = Math.round((2 + Math.random() * 2));
        child.graphics.beginFill(getColor());
        child.graphics.drawCircle(size, size, size);
        child.graphics.endFill();
        child.x = -500 + Math.random() * 1000;
        child.y = 0;
        child.scaleY = 1.5;
        child.rotation = -30 + Math.random() * 60;
        container.addChild(child);
        addChild(container);
        
        var direction:int = 1;
        var rangeX:int = 50 + Math.floor(Math.random() * 50);
        var duration:int = 15 + Math.floor(Math.random() * 10);
        var timeline:TweensyTimeline = Tweensy.to(container, {y:500+child.height}, duration, Back.easeOut);
        timeline.onComplete = function():void{
            removeChild(container);
        };
        Tweensy.to(container, {x:500}, duration);
        addEventListener(Event.ENTER_FRAME, function(event:Event):void{
            child.x += direction;
            
            if(child.x < -1 * rangeX) direction *= -1;
            if(child.x > rangeX) direction *= -1;
        });        
    }
    
    private function getColor():uint{
        /*
        var red:uint = 0x0000FF << 16;
        var green:uint = (Math.random()*0x000066) << 8;
        var blue:uint = Math.random()*0x0000CC;
        return red+green+blue;
        */
        return 0xFFE6E6;    //FFEEEE
    }
}