forked from: forked from: ぱーてぃくる花火 [corrected leak]

corrected leak - now safe and endless 花火 
@Hasufel

by spectrum 12 Dec 2012

• Forked from Hasufel's forked from: ぱーてぃくる花火 [corrected leak]
• Diff: 1
• Related works: 2
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// forked from Hasufel's forked from: ぱーてぃくる花火 [corrected leak]
// forked from Susisu's ぱーてぃくる花火
// corrected leak - now safe and endless 花火 
// @Hasufel

package {

    import flash.display.Sprite;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.display.StageQuality;
    import flash.filters.BlurFilter;
    import flash.geom.Point;
    import flash.events.Event;
    import net.hires.debug.Stats;
    
    [SWF(width="465", height="465", backgroundColor="0x0", frameRate="60")]
    
    public class Rain extends Sprite{
        private var h:int = stage.stageHeight;
        private var w:int = stage.stageWidth;
        private var bmpData:BitmapData=new BitmapData(h,w,true,0);
        private var filterObj:BlurFilter;
        private var obj:Array=[];
        private var angle:int;
        private var pt:int=50;
        private var cols:Array=[Math.round(Math.random()*255),Math.round(Math.random()*255),Math.round(Math.random()*255)];
    
        public function Rain(){
            stage.scaleMode=StageScaleMode.NO_SCALE;
            stage.align=StageAlign.TOP_LEFT;
            stage.quality=StageQuality.LOW;
            addChild(new Stats());
            filterObj=new BlurFilter(2,2,2);
            addChild(new Bitmap(bmpData)) as Bitmap;
            addEventListener(Event.ENTER_FRAME,loop);
        }
        private function loop(e:Event):void{
            for (var j:int=0;j<3;j++){
                cols[j]+=Math.floor(Math.random()*9)-4;
                if(cols[j]>255){cols[j]=255;}else if(cols[j]<0){cols[j]=0;}
            }
            for(var i:int=0;i<pt;i++){
                angle=Math.round(Math.random()*360);
                createParticle(Math.cos(angle/180*Math.PI)*Math.random()*5,Math.sin(angle/180*Math.PI)*Math.random()*5,0xff000000|cols[0]<<16|cols[1]<<8|cols[2],mouseX,mouseY);
            }
            
            var o:int = obj.length;
            bmpData.applyFilter(bmpData,bmpData.rect,new Point(0,0),filterObj);
            bmpData.lock();
            while(o--) {
                var p:Particle = obj[o];
                p.x+=p.vx;
                p.y+=p.vy;
                p.vx*=.95;
                p.vy*=.95;
                bmpData.setPixel32(p.x,p.y,p.c);
                if (p.vx+p.vy<.1&&p.vx+p.vy>-.1){obj.splice(o,1);}
            }
            bmpData.unlock();
        }


        private function createParticle(vx:Number, vy:Number, c:uint, xx:Number=0, yy:Number=0):void {
            var p:Particle = new Particle();
            p.x = xx;
            p.y = yy;
            p.vx = vx;
            p.vy = vy;
            p.c = c;
            obj.push(p);
        }
    }
}

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