逼真的水波效果

package {
import flash.display.*;
import flash.events.*;
import flash.filters.ConvolutionFilter;
import flash.filters.DisplacementMapFilter;
import flash.geom.*;
import flash.net.URLRequest;
public class BitMapDemo extends Sprite {
private var mouseDown:Boolean = false;
private var result:BitmapData;
private var result2:BitmapData;
private var source:BitmapData;
private var buffer:BitmapData;
private var output:BitmapData;
private var surface:BitmapData;
private var pic:Bitmap;
private var bounds:Rectangle;
private var origin:Point;
private var matrix:Matrix;
private var matrix2:Matrix;
private var wave:ConvolutionFilter;
private var damp:ColorTransform;
private var water:DisplacementMapFilter;
//
private var imgW:Number = 400;
private var imgH:Number = 300;

public function BitMapDemo () {
super ();
buildwave ();
}
private function buildwave ():void {
result = new BitmapData(imgW, imgH, false, 128);
result2 = new BitmapData(imgW*2, imgH*2, false, 128);
source = new BitmapData(imgW, imgH, false, 128);
buffer = new BitmapData(imgW, imgH, false, 128);
output = new BitmapData(imgW*2, imgH*2, true, 128);
bounds = new Rectangle(0, 0, imgW, imgH);
origin = new Point();
matrix = new Matrix();
matrix2 = new Matrix();
matrix2.a = matrix2.d=2;
wave = new ConvolutionFilter(3, 3, [1, 1, 1, 1, 1, 1, 1, 1, 1], 9, 0);
damp = new ColorTransform(0, 0, 9.960937E-001, 1, 0, 0, 2, 0);
water = new DisplacementMapFilter(result2, origin, 4, 4, 48, 48);
var _bg:Sprite = new Sprite();
addChild (_bg);
_bg.graphics.beginFill (0xFFFFFF,0);
_bg.graphics.drawRect (0,0,imgW,imgH);
_bg.graphics.endFill ();
addChild (new Bitmap(output));
buildImg ();
}
private function frameHandle (_e:Event):void {

var _x:Number = mouseX/2;
var _y:Number = mouseY/2;
source.setPixel (_x+1, _y, 16777215);
source.setPixel (_x-1, _y, 16777215);
source.setPixel (_x, _y+1, 16777215);
source.setPixel (_x, _y-1, 16777215);
source.setPixel (_x, _y, 16777215);
result.applyFilter (source, bounds, origin, wave);
result.draw (result, matrix, null, BlendMode.ADD);
result.draw (buffer, matrix, null, BlendMode.DIFFERENCE);
result.draw (result, matrix, damp);
result2.draw (result, matrix2, null, null, null, true);
output.applyFilter (surface, new Rectangle(0, 0, imgW, imgH), origin, water);
buffer = source;
source = result.clone();
}
private function buildImg ():void {

///建一个pic00资源类
surface = new pic00(10,10);
addEventListener (Event.ENTER_FRAME,frameHandle);
}
}
}