Wave.as

package com.shanimal.fx {

    import flash.display.BitmapData;
    import flash.display.BitmapDataChannel;
    import flash.events.TimerEvent;
    import flash.filters.DisplacementMapFilter;
    import flash.filters.DisplacementMapFilterMode;
    import flash.filters.GlowFilter;
    import flash.geom.Point;
    import flash.utils.Timer;

    import spark.components.Image;

    public class Wave {

        // private stuff
        private var _animating:Boolean = false;
        private var _dmFilter:DisplacementMapFilter;
        private var _originalBmpData:BitmapData;
        private var _originalFilters:Array;
        private var _target:*;
        private var _timer:Timer = new Timer(Math.floor(1000/32));

        // constructor
        public function Wave(){
            _timer.addEventListener(TimerEvent.TIMER,eof);
            _timer.start();
        }

        // public getters/setters
        /**
         * releases the prior target and assigns a new target. making this a good button component for a list of <s:Image flags
         *
         * usage:flex <fx:Script ...
         * <pre>
         *   [Bindable] private var wave:Wave = new Wave();
         *   private var _locale:String = "";
         *
         *   [Bindable]
         *   private function get locale():String {
         *      return _locale;
         *   }
         *   private function set locale(s:String):void{
         *      _locale = s;
         *      var defaultChain:Array = ["es_MX",LocaleID.DEFAULT];
         *      var flags:Object = {
         *          "en_US":{target:flagEnglish,chain:["en_US"].concat(defaultChain)},
         *          "de_DE":{target:flagDeutsch,chain:["de_DE"].concat(defaultChain)},
         *          "pi_RT":{target:flagPirate,chain:["pi_RT","en_GB"].concat(defaultChain)}
         *      }
         *      resourceManager.localeChain = flags[s].chain;
         *      wave.target = flags[s].target;
         *   }
         * </pre>
         */
        [Bindable]
        public function get target():* {
            return _target;
        }
        public function set target(t:*):void{
            if(t == target) return;
            if(t.hasOwnProperty("bitmapData")){
                initTarget(t);
            }
        }

        //public methods
        public function play():void{
            _animating = true;
        }
        public function restore():void{
            if(_originalBmpData && target){
                (target as Image).bitmapData.draw(_originalBmpData);
                target.filters = _originalFilters
            }
        }
        public function stop():void{
            _animating = false;
        }

        // protected methods
        protected function applyEffect(t:Image):void{
            var mapBmd:BitmapData = t.bitmapData;
            mapBmd.perlinNoise(15,30,2,0,true,false,BitmapDataChannel.RED|BitmapDataChannel.BLUE,false,[new Point(-_timer.currentCount,_timer.currentCount/100),new Point(mapBmd.rect.width,mapBmd.rect.height)]);
            _dmFilter = _dmFilter || new flash.filters.DisplacementMapFilter(mapBmd, new Point(), BitmapDataChannel.RED, BitmapDataChannel.BLUE, -5, -5, DisplacementMapFilterMode.CLAMP);
            _dmFilter.mapBitmap = mapBmd;
            t.filters = [_dmFilter];
        }
        protected function eof(e:TimerEvent):void{
            if(_animating && target && target.bitmapData)
                applyEffect(target);
        }
        protected function initTarget(t:*):void{
            restore();
            _target = t;
            _originalBmpData = target.bitmapData.clone();
            _originalFilters = target.filters;
            play();
        }
    }
}