flash on 2011-4-6

/**
 * Copyright yama3 ( http://wonderfl.net/user/yama3 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/3ItJ
 */

package {
    import flash.display.Sprite;
    
    [SWF(backgroundColor="#000000", width="465", height="465", frameRate="30")]    
    
    public class FlashTest extends Sprite {
        private var twinkle:TwinkleParticles;
        
        public function FlashTest() {
            init();            
        }
        
        private function init():void {
            graphics.beginFill(0x000000);
            graphics.drawRect(0, 0, 465, 465);
            graphics.endFill();
            
            twinkle = new TwinkleParticles();
            addChild(twinkle);
        }
    }
}

import flash.display.Sprite;
import flash.events.Event;
import flash.geom.Rectangle;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.ColorTransform;
import flash.geom.Point;
import flash.filters.BlurFilter;
import frocessing.color.ColorHSV;

class TwinkleParticles extends Sprite {
    private var particles:Array;
    private var rect:Rectangle;
    private var bitmapData:BitmapData;
    private var bitmap:Bitmap;
    private var container:Sprite;
    private static var colorTrans:ColorTransform;
    private static var point:Point = new Point();
    private static var blur:BlurFilter;
    private var count:uint = 0;
    private var color:ColorHSV;
    private static var cx:uint = 232;
    private static var cy:uint = 232;
    private static var radius:uint = 160;
    private static var radian:Number = Math.PI / 180;
    
    public function TwinkleParticles() {
        particles = new Array();
        if(stage) init();
        else addEventListener(Event.ADDED_TO_STAGE, init, false, 0, true);
    }
    
    private function init(evt:Event = null):void {
        removeEventListener(Event.ADDED_TO_STAGE, init);
        rect = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);
        bitmapData = new BitmapData(rect.width, rect.height, true, 0x00000000);
        bitmap = new Bitmap(bitmapData);
        addChild(bitmap);
        container = new Sprite();
        addChild(container);
        colorTrans = new ColorTransform(1, 1, 1, 0.6, 0, 0, 0, 0);
        blur = new BlurFilter(16, 16, 3);
        color = new ColorHSV(0, 0.5);
        addEventListener(Event.ENTER_FRAME, create, false, 0, true);
        addEventListener(Event.ENTER_FRAME, update, false, 0, true);
    }
    private function create(evt:Event):void {
        count += 2;
        color.h = count;
        var particle:Particle = new Particle(color.value);
        particle.x = cx + radius*Math.sin(count * 4 * radian)*Math.cos(count*radian);
        particle.y = cy + radius*Math.sin(count * 9 * radian)*Math.sin(count*radian);
        container.addChild(particle);
        particles.push(particle);
    }
    
    private function update(evt:Event):void {
        for(var n:uint=0; n < particles.length; n++) {
            var particle:Particle = particles[n];
            particle.update();
            if(particle.life < 0 || particle.y > stage.stageHeight + 50) {
                container.removeChild(particle);
                particles.splice(n, 1);
                particle = null;
            }
        }
        draw();
    }
    private function draw():void {
        bitmapData.lock();
        bitmapData.draw(container, null, colorTrans);
        bitmapData.applyFilter(bitmapData, rect, point, blur);
        bitmapData.unlock();
    }
}

import flash.display.Sprite;
import flash.filters.GlowFilter;

class Particle extends Sprite {
    private var glow:GlowFilter;
    private var _width:uint = 12;
    private var _height:uint = 18;
    private var blur:uint = 8;
    private static var color:uint = 0xffffff;
    private static var max:uint = 50;
    public var life:int = max;
    private static var radius:Number = 3;
    private var dx:Number = 0;
    private var gravity:Number = -6;
    private static var acceleration:Number = 0.8;
    
    public function Particle(rgb:uint=0xffffff, w:uint=12, h:uint=18, b:uint=8) {
        _width = w;
        _height = h;
        blur = b;
        glow = new GlowFilter(rgb, 1, blur, blur, 2, 3, false, false);
        draw();
        init();
    }
    
    private function init():void {
        dx = Math.random()*radius*2 - radius;
    }
    public function update():void {
        if(life < 0) return;
        life--;
        x += dx;
        gravity += acceleration;
        y += gravity;
        alpha = (life/max < 0.5) ? life * 2 / max : 1;
        blink();
    }
    private function blink():void {
        if(life%4 == 0) {
            visible = false;
        } else {
            visible = true;
        }
    }
    private function draw():void {
        graphics.beginFill(color);
        graphics.moveTo(0, -_height/2);
        graphics.curveTo(0, 0, -_width/2, 0);
        graphics.curveTo(0, 0, 0, _height/2);
        graphics.curveTo(0, 0, _width/2, 0);
        graphics.curveTo(0, 0, 0, -_height/2);
        graphics.endFill();
        filters = [glow];
    }
}