?/*** FireFX by Grant Skinner. May 30, 2007* Visit www.gskinner.com/blog for documentation, updates and more free code.** You may distribute and modify this class freely, provided that you leave this header intact,* and add appropriate headers to indicate your changes. Credit is appreciated in applications* that use this code, but is not required.** Please contact info@gskinner.com for more information.*/package com.gskinner.effects {	import flash.display.BitmapData;	import flash.geom.Matrix;	import flash.geom.Point;	import flash.geom.ColorTransform;	import flash.filters.ColorMatrixFilter;	import flash.filters.BlurFilter;	import flash.filters.DisplacementMapFilter;	import flash.display.Sprite;	import flash.display.MovieClip;	import flash.events.Event;	import flash.display.Bitmap;	import flash.display.DisplayObject;		public class FireFX extends Sprite {		private var _fadeRate:Number=0.4;		private var _distortionScale:Number=0.4;		private var _distortion:Number=0.5;		private var _flameHeight:Number=0.3;		private var _flameSpread:Number=0.3;		private var _blueFlame:Boolean = false;		private var _smoke:Number = 0;			// private properties:		// display elements:		private var displayBmp:BitmapData;		private var scratchBmp:BitmapData;		private var perlinBmp:BitmapData;				// geom:		private var mtx:Matrix;		private var pnt:Point;		private var drawColorTransform:ColorTransform;				// filters:		private var fireCMF:ColorMatrixFilter;		private var dispMapF:DisplacementMapFilter;		private var blurF:BlurFilter;				// other:		private var endCount:Number;		private var bmpsValid:Boolean=false;		private var perlinValid:Boolean=false;		private var filtersValid:Boolean=false;		private var _target:DisplayObject;				public function FireFX() {			var frame:DisplayObject = getChildAt(0);			frame.visible = false;			frame.height = height;			frame.width = width;			scaleX = scaleY = 1;						mtx = new Matrix();			pnt = new Point();						startFire();		}				// getter/setters:		override public function set width(value:Number):void {			bmpsValid &&= (value == width);			super.width = value|0;		}		override public function get width():Number {			return super.width;		}				override public function set height(value:Number):void {			bmpsValid &&= (value == height);			super.height = value|0;		}		override public function get height():Number {			return super.height;		}				[Inspectable(defaultValue=0.4,name='fadeRate (0-1)')]		/**         * Sets the rate that flames fade as they move up. 0 is slowest, 1 is fastest.         *         * @default 0.4		 */		public function set fadeRate(value:Number):void {			filtersValid &&= (value == _fadeRate);			_fadeRate = value;		}		public function get fadeRate():Number {			return _fadeRate;		}				[Inspectable(defaultValue=0.4,name='distortionScale (0-1)')]		/**         * Sets the scale of flame distortion. 0.1 is tiny and chaotic, 1 is large and smooth.         *         * @default 0.4		 */		public function set distortionScale(value:Number):void {			perlinValid &&= (value == _distortionScale);			_distortionScale = value;		}		public function get distortionScale():Number {			return _distortionScale;		}				[Inspectable(defaultValue=0.4,name='distortion (0-1)')]		/**         * Sets the amount of distortion. 0.1 is little, 1 is chaotic.         *         * @default 0.4		 */		public function set distortion(value:Number):void {			filtersValid &&= (value == _fadeRate);			_distortion = value;		}		public function get distortion():Number {			return _distortion;		}				[Inspectable(defaultValue=0.3,name='flameHeight (0-1)')]		/**         * Sets the how high the flame will burn. 0 is zero gravity, 1 is a bonfire.         *         * @default 0.3		 */		public function set flameHeight(value:Number):void {			perlinValid &&= (value == _flameHeight);			_flameHeight = value;		}		public function get flameHeight():Number {			return _flameHeight;		}				[Inspectable(defaultValue=0.3,name='flameSpread (0-1)')]		/**         * Sets the how much the fire will spread out around the target. 0 is no spread, 1 is a lot.         *         * @default 0.3		 */		public function set flameSpread(value:Number):void {			filtersValid &&= (value == _flameSpread);			_flameSpread = value;		}		public function get flameSpread():Number {			return _flameSpread;		}				[Inspectable(defaultValue=false,name='blueFlame')]		/**         * Indicates whether it should use a blue or red flame.         *         * @default false		 */		public function set blueFlame(value:Boolean):void {			filtersValid &&= (value == _blueFlame);			_blueFlame = value;		}		public function get blueFlame():Boolean {			return _blueFlame;		}				[Inspectable(defaultValue=0,name='smoke (0-1)')]		/**         * Sets the amount of smoke. 0 little, 1 lots.         *         * @default 0		 */		public function set smoke(value:Number):void {			filtersValid &&= (value == _smoke);			_smoke = value;		}		public function get smoke():Number {			return _smoke;		}						[Inspectable(defaultValue='',name='target')]		/**         * Sets the amount of smoke. 0 little, 1 lots.         *         * @default 		 */		public function set targetName(value:String):void {			var targ:DisplayObject = parent.getChildByName(value);			if (targ == null) {				try { targ = parent[value] as DisplayObject; }				catch (e:*) {}			}			target = targ;		}				/**         * Defines the shape of the fire. The fire will burn upwards, so it should be near the bottom, and centered in the FireFX component.         *         * @default 		 */		public function set target(value:DisplayObject):void {			_target = value;			clear();		}		public function get target():DisplayObject {			return _target;		}				/**         * Clears the fire.		 */		public function clear():void {			if (displayBmp) {				displayBmp.fillRect(displayBmp.rect,0);			}		}				/**         * Stops the fire effect after letting it burn down over 20 frames.		 */		public function stopFire():void {			// let the fire burn down for 20 frames:			if (endCount == 0) { endCount = 20; }		}						private function updateBitmaps():void {			if (displayBmp) {				displayBmp.dispose();				displayBmp = null;				scratchBmp.dispose();				scratchBmp = null;				perlinBmp.dispose();				perlinBmp = null;			}						displayBmp = new BitmapData(width, height, true, 0);			scratchBmp = displayBmp.clone();			perlinBmp = new BitmapData(width*3, height*3, false, 0);						while (numChildren) { removeChildAt(0); }			addChild(new Bitmap(displayBmp));						updatePerlin();			updateFilters();			bmpsValid = true;		}				private function updatePerlin():void {			perlinBmp.perlinNoise(30*_distortionScale,20*_distortionScale,1,-Math.random()*1000|0,false,true,1|2,false);			perlinBmp.colorTransform(perlinBmp.rect,new ColorTransform(1,  1-_flameHeight*0.5  ,1,1,0,0,0,0));			perlinValid = true;		}				function updateFilters():void {			if (_blueFlame) {				fireCMF = new ColorMatrixFilter([0.8-0.55*_fadeRate,0,0,0,0,												 0,0.93-0.48*_fadeRate,0,0,0,												 0,0.1,0.96-0.35*_fadeRate,0,0,												 0,0.1,0,1,-25+_smoke*24]);				drawColorTransform = new ColorTransform(0,0,0,1,210,240,255,0);			} else {				fireCMF = new ColorMatrixFilter([0.96-0.35*_fadeRate,0.1,0,0,-1,												 0,0.9-0.45*_fadeRate,0,0,0,												 0,0,0.8-0.55*_fadeRate,0,0,												 0,0.1,0,1,-25+_smoke*24]);				drawColorTransform = new ColorTransform(0,0,0,1,255,255,210,0);			}			dispMapF = new DisplacementMapFilter(perlinBmp,pnt,1,2,14*_distortion,-30,"clamp");			blurF = new BlurFilter(32*_flameSpread,32*_flameSpread,1);						filtersValid = true;		}								private function startFire():void {			endCount = 0;			addEventListener(Event.ENTER_FRAME,doFire);		}				private function doFire(evt:Event):void {			if (_target == null) { return; }			if (!bmpsValid) { updateBitmaps(); }			if (!perlinValid) { updatePerlin(); }			if (!filtersValid) { updateFilters(); }			if (endCount == 0) {				var drawMtx:Matrix = _target.transform.matrix;				drawMtx.tx = _target.x-x;				drawMtx.ty = _target.y-y;				scratchBmp.fillRect(scratchBmp.rect,0);				drawColorTransform.alphaOffset = -Math.random()*200|0;				scratchBmp.draw(_target,drawMtx,drawColorTransform,"add");				scratchBmp.applyFilter(scratchBmp,scratchBmp.rect,pnt,blurF);				displayBmp.draw(scratchBmp,mtx,null,"add");			}			dispMapF.mapPoint = new Point( -Math.random()*(perlinBmp.width-displayBmp.width)|0, -Math.random()*(perlinBmp.height-displayBmp.height)|0 );			displayBmp.applyFilter(displayBmp,displayBmp.rect,pnt,dispMapF);			displayBmp.applyFilter(displayBmp,displayBmp.rect,pnt,fireCMF);						if (endCount != 0 && --endCount == 0) {				removeEventListener(Event.ENTER_FRAME,doFire);			}		}			}}