// forked from soundkitchen's パァン！
package
{
    import flash.display.BlendMode;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.TimerEvent;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;
    import flash.filters.BitmapFilterQuality;
    import flash.filters.BlurFilter;
    import flash.geom.Point;
    import flash.utils.Timer;

import com.flashdynamix.utils.SWFProfiler;
    import frocessing.color.ColorHSV;
    import org.libspark.betweenas3.BetweenAS3;
    import org.libspark.betweenas3.easing.*;
    import org.libspark.betweenas3.tweens.ITween;

[SWF(width=465, height=465, frameRate=60, backgroundColor=0x000000)]
    public class Main extends Sprite
    {
        private static var P_ZERO:Point = new Point();
        private static var F_BLUR:BlurFilter = new BlurFilter(4, 4, BitmapFilterQuality.LOW);

private var _txt:TextField;
        private var _hsv:ColorHSV;
        private var _film:BitmapData;
        private var _timer:Timer;
        private var _activeParticles:Vector.<Particle>;
        private var _inactiveParticles:Vector.<Particle>;

public function Main()
        {
            addEventListener(Event.ADDED_TO_STAGE, initialize);
        }

private function initialize(evt:Event):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, initialize);

SWFProfiler.init(this);

var i:uint,
                fmt:TextFormat,
                bm:Bitmap;

_activeParticles = new Vector.<Particle>();
            _inactiveParticles = new Vector.<Particle>();
            for (i=0; i<10000; i++)
            {
                _inactiveParticles.push(new Particle());
            }

_hsv = new ColorHSV(0, 1, 1, 1);

fmt = new TextFormat();
            fmt.font = "Verdana";
            fmt.bold = true;
            fmt.size = 36;

_txt = new TextField();
            _txt.defaultTextFormat = fmt;
            _txt.autoSize = TextFieldAutoSize.LEFT;
            _txt.text = "LOADING...";

_film = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0);
            bm = new Bitmap(_film);
            //bm.blendMode = BlendMode.ADD;
            addChild(bm);

_timer = new Timer(0);
            _timer.addEventListener(TimerEvent.TIMER, timerHandler);
            _timer.start();

addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }

private function enterFrameHandler(evt:Event):void
        {
            var i:uint,
                p:Particle;

_hsv.h = ++_hsv.h % 360;

_film.lock();
            _film.applyFilter(_film, _film.rect, P_ZERO, F_BLUR);
            for (i=0; i<_activeParticles.length; i++)
            {
                p = _activeParticles[i];
                p.x += p.vx;
                p.y += p.vy;
                p.life--;

_film.setPixel32(p.x, p.y, p.color);

if (!p.life)
                {
                    _activeParticles.splice(i, 1);
                    _inactiveParticles.push(p);
                    i--;
                }
            }
            _film.unlock();
        }

private function timerHandler(evt:TimerEvent):void
        {
            _timer.delay = (50 + Math.random() * 950) >> 0;

var sp:Sprite,
                bm:Bitmap,
                bmd:BitmapData,
                t:ITween;

//_hsv.h = ++_hsv.h % 360;
            _txt.textColor = _hsv.value;

bmd = new BitmapData(_txt.width, _txt.height, true, 0);
            bmd.draw(_txt);

bm = new Bitmap(bmd);
            bm.smoothing = true;
            bm.x -= bm.width >> 1;
            bm.y -= bm.height >> 1;

sp = new Sprite();
            sp.addChild(bm);
            sp.x = (Math.random() * stage.stageWidth) >> 0;
            sp.y = (Math.random() * stage.stageHeight) >> 0;
            sp.scaleX = 0;
            sp.scaleY = 0;
            sp.rotation = (Math.random() * 360) >> 0;
            //sp.blendMode = BlendMode.ADD;

addChild(sp);

t = BetweenAS3.serial(
                BetweenAS3.to(sp, {
                    'scaleX': 1,
                    'scaleY': 1,
                    'rotation': 0
                }, 2, Expo.easeIn),
                BetweenAS3.removeFromParent(sp)
            );

t.onComplete = tweenComplete;
            t.onCompleteParams = [sp, bm, bmd];
            t.play();
        }

private function tweenComplete(sp:Sprite, bm:Bitmap, bmd:BitmapData):void
        {
            var i:uint, j:uint, c:uint,
                cx:Number, cy:Number,
                angle:Number, strength:Number,
                p:Particle;

cx = sp.x + bm.x;
            cy = sp.y + bm.y;

for (i=0; i<bmd.width; i++)
            {
                for (j=0; j<bmd.height; j++)
                {
                    c = bmd.getPixel32(i, j);

if (!c) continue;

p = _inactiveParticles.length ? _inactiveParticles.shift() : new Particle();

angle = Math.random() * Math.PI * 2;
                    strength = Math.random() * 20;

p.vx = Math.cos(angle) * strength;
                    p.vy = Math.sin(angle) * strength;
                    p.x = cx + i;
                    p.y = cy + j;
                    p.color = c;
                    p.life = 200;

_activeParticles.push(p);
                }
            }
            bmd.dispose();
        }
    }
}

class Particle
{
    public var vx:Number;
    public var vy:Number;
    public var x:Number;
    public var y:Number;
    public var color:uint;
    public var life:uint;
}

forked from: パァン！