forked from: burn

/**
 * Copyright Etienne.Verhote ( http://wonderfl.net/user/Etienne.Verhote )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/lz6N
 */

// forked from 178ep3's burn
package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.filters.BlurFilter;

    public class Burn extends Sprite
    {
        public function Burn()
        {
            var stg:Sprite = new Sprite();
            var list:Array = [];
            
            var i:uint=0;
            for(i=0; i<3000; i++)
            {
                var p:Particle = stg.addChild(new Particle())as Particle;
                p.x = Math.random()*100-50 + 233;
                p.y = Math.random()*100-50 + 233;
                var angle:Number = Math.random()*360*Math.PI/180;
                p.speed = Math.random()*2+1;
                p.sx = Math.cos(angle)*p.speed;
                p.sy = Math.sin(angle)*p.speed;
                list[i] = p;
            }
            
            var center:Shape = stg.addChild(new Shape())as Shape;
            center.x = center.y = 233;
            center.graphics.beginFill(0);
            center.graphics.drawCircle(0,0,40);
            center.graphics.endFill();
            
            stg.filters = [new BlurFilter(5,5,2)];
            
            addEventListener(Event.ENTER_FRAME,loop);
            
            var bmp:Bitmap = addChild(new Bitmap(new BitmapData(465,465,true,0)))as Bitmap;
            
            var shape:Shape = new Shape();
            shape.graphics.beginFill(0,0.05);
            shape.graphics.drawRect(0,0,465,465);
            shape.graphics.endFill();
            
            function loop(e:Event):void
            {
                bmp.bitmapData.draw(shape);
                for(i=0; i<3000; i++)
                {
                    list[i].move();
                }
                bmp.bitmapData.draw(stg);
            }
        }
        
    }
}
    import flash.display.Shape;
    import flash.geom.Point;
    
class Particle extends Shape
{
    public var speed:Number;
    public var sx:Number;
    public var sy:Number;
    private var _zero:Point = new Point(233,233);
    public var gravity:Number=1;
    
    public function Particle()
    {
        this.graphics.beginFill(0xff<<16 | 0x90*Math.random()<<8 | 0x00);
        this.graphics.drawCircle(0,0,1);
        this.graphics.endFill();
        this.scaleX = this.scaleY = 0.75;
    }
    
    public function move():void
    {
        if(this.x > _zero.x)sx -= gravity;
        else sx += gravity;
        if(this.y > _zero.y)sy -= gravity;
        else sy += gravity;
        sx*=0.998;
        sy*=0.998;
        this.x += sx;
        this.y += sy;
    }
}