bitmapdata的功能，不规则图形的遮罩

import flash.display.Bitmap;

import flash.display.BitmapData;

import flash.display.BitmapDataChannel;

import flash.geom.Point;

import flash.geom.Rectangle;

 

var bmd1:BitmapData = new BitmapData(200, 200, true, 0xFFCCCCCC);

 

var seed:int = int(Math.random() * int.MAX_VALUE);

var channels:uint = BitmapDataChannel.RED | BitmapDataChannel.BLUE;

bmd1.perlinNoise(100, 80, 12, seed, false, true, channels, false, null);

 

var bitmap1:Bitmap = new Bitmap(bmd1);

addChild(bitmap1);

 

var bmd2:BitmapData = new BitmapData(200, 200, true, 0xFFCCCCCC);

var pt:Point = new Point(0, 0);

var rect:Rectangle = new Rectangle(0, 0, 200, 200);

var threshold:uint =  0x00800000; 

var color:uint = 0x20FF0000;

var maskColor:uint = 0x00FF0000;

bmd2.threshold(bmd1, rect, pt, ">", threshold, color, maskColor, true);

 

var bitmap2:Bitmap = new Bitmap(bmd2);

bitmap2.x = bitmap1.x + bitmap1.width + 10;

addChild(bitmap2);

 

 

import flash.display.Bitmap;

import flash.display.BitmapData;

import flash.display.BitmapDataChannel;

import flash.geom.Point;

import flash.geom.Rectangle;

var bmd:BitmapData =new BitmapData(200,200, true,0xFFFF0000);

var bmdMask:BitmapData =new BitmapData(200,200, true);

var seed:int=int(Math.random() *int.MAX_VALUE);

var channels:uint= BitmapDataChannel.RED | BitmapDataChannel.BLUE;

bmdMask.perlinNoise(100, 80, 12, seed, false, true,channels, false, null);

var bitmap:Bitmap =new Bitmap(bmd);

var bitmapMask:Bitmap =new Bitmap(bmdMask);

//addChild(bitmap);

//addChild(bitmapMask);

var threshold:uint= 0x00800000;

 

var color:uint= 0x00FFFFFF;

var maskColor:uint= 0x00FF0000;

bmdMask.threshold(bmdMask, bmdMask.rect, new Point(), ">",threshold, color, maskColor, true);

var spriteMask =new Sprite();

spriteMask.addChild(bitmapMask);

spriteMask.cacheAsBitmap =true;

addChild(spriteMask);

 

 

 

var display =new Sprite();

display.addChild(bitmap);

display.cacheAsBitmap =true;

addChild(display);

display.mask = spriteMask;