package {
	
	import flash.display.Sprite;
	import flash.display.BitmapData;
	import flash.display.Bitmap;
	import flash.geom.*;
	import flash.filters.*;
	import flash.events.*;
	import flash.ui.ContextMenu;
    import flash.ui.ContextMenuItem;
    import flash.ui.ContextMenuBuiltInItems;
    import flash.events.ContextMenuEvent;
	
	public class BlurFade extends Sprite {
		
		private var sprMain:Sprite;
		private var bmpMain:BitmapData;
		private var bmp:Bitmap;
		
		private var blur:BlurFilter;
		private var rate:Number = .95;//this will make our effect fade to black
		private var colorMatrix:ColorMatrixFilter;
		
		private var rectMain:Rectangle;
		private var pntOrigin:Point;
		
		private var currX:Number;
		private var currY:Number;
		
		private var range:Number = stage.stageWidth/4;;
		private var currAngle:Number = 180/Math.PI*2;
		
		public function BlurFade() {
			
			//drawing sprite and bitmap object
			sprMain = new Sprite();
			bmpMain = new BitmapData(stage.stageWidth,stage.stageHeight,true,0);
			
			//filters
			blur = new BlurFilter(3,3,3);
			
			colorMatrix = new ColorMatrixFilter([
			   rate,0,0,0,1,
			   0,rate,0,0,1,
			   0,0,rate,0,1,
			   0,0,0,rate,
			]);
			
			//these are for the applyFilter method
			rectMain = new Rectangle(0,0,stage.stageWidth,stage.stageHeight);
			pntOrigin = new Point(0,0);
			
			this.addEventListener(Event.ENTER_FRAME,goDraw);
			
			currX = stage.stageWidth/2;
			currY = stage.stageHeight/2;
			
		}
		
		private function goDraw(evt:Event):void {
			
			sprMain.graphics.clear();
			
			sprMain.graphics.beginFill(0xFFFFFF);
			
			var newX:Number = Math.sin(currAngle)*range+currX;
			var newY:Number = Math.cos(currAngle)*range+currY;
			
			sprMain.graphics.drawCircle(newX,newY,50);
			
			currAngle+=.1;
			
			bmpMain.draw(sprMain);
			
			//apply our filters
			bmpMain.applyFilter(bmpMain,rectMain,pntOrigin,blur);
			bmpMain.applyFilter(bmpMain,rectMain,pntOrigin,colorMatrix);
			
			//this is what will be shown on the stage
			bmp = new Bitmap(bmpMain);
			
			//here I'm adding the drawing behind the previous effects so that we don't ever see the raw circle
			stage.addChildAt(bmp,0);
			
			if(stage.numChildren > 3) {
				stage.removeChildAt(1);
			}
			
		}
		
	}
	
}