package

{

    import flash.display.Sprite;

    import flash.display.*

    import flash.events.Event;

    import flash.filters.DisplacementMapFilter;

    import flash.geom.*

    /**

     * @author:Frost.Yen

     * @E-mail:871979853@qq.com

     * @create:    2016-6-28 下午3:37:51

     *

     */

    [SWF(width="1024",height="768")]

    public class FireEffect extends Sprite

    {

        private var bmd:BitmapData;

        private var target:Sprite = createSharp(400, 30,0);

        private var speed:Number = Math.random() * 4 + 4;

        private var strengh:Number = Math.random() * 60 + 60;

        private var size:Number = Math.random() * 17 + 20;

        private var randomseed:Number = Math.floor(Math.random() * 10);

        private var offset:Point = new Point();

        private var v:Point;

        private var w:Number = 50;

        public function FireEffect()

        {

            addChild(target);

            addTo(target);

            target.x = 0;

            target.y = 200;

        }

        private function createSharp(width:Number,height:Number,angle:Number):Sprite {

            var s:Sprite = new Sprite();

            s.graphics.beginFill(0, 0);

            s.graphics.drawRect( -w, -w, width + 2 * w,  w);

            s.graphics.beginFill(0xffffff);

            s.graphics.drawRect( -w, height, width + 2 * w,  w);

            var fillType:String = GradientType.LINEAR;

            var colors:Array = [0x900000, 0x900000,0xff9900,0xfffd8a,0xffffff];

            var alphas:Array = [0,1,1,1, 1];

            var ratios:Array = [0x00,0xff/16,0xff*2/6,0xff*2/3, 0xFF];

            var matr:Matrix = new Matrix();

            matr.createGradientBox(width, height, Math.PI / 2);

            var spreadMethod:String = SpreadMethod.PAD;

            s.graphics.beginGradientFill(fillType, colors, alphas, ratios, matr, spreadMethod);

            s.graphics.drawRect(0, 0, width, height);

            return s;

        }

        public function addTo(target:Object):void {

            bmd = new BitmapData(target.width, target.height);

            v = new Point(Math.random() * (speed / 4) - speed / 8,Math.random() * (speed / 4) + speed / 4 * 3);

            target.addEventListener(Event.ENTER_FRAME, update);

        }

        private function update(e:Event):void {

            target.filters = [new DisplacementMapFilter(bmd, new Point(), BitmapDataChannel.RED,BitmapDataChannel.RED, 10, strengh, "clamp")];

            offset=offset.add(v);

            bmd.perlinNoise(size / 2, size, 3, randomseed, false, true, 1, true, [offset, offset]);

        }

    }

}