Flex「放大鏡」/掩蔽

我在製作放大鏡應用程序，需要一些幫助。目前，我有以下代碼：Flex「放大鏡」/掩蔽

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()"> 
<mx:Script> 
<![CDATA[ 
    // This code assumes it's being run within a display object container 

// such as a MovieClip or Sprite instance. 

import flash.display.GradientType; 
import flash.display.Loader; 
import flash.display.Sprite; 
import flash.geom.Matrix; 
import flash.net.URLRequest; 

private function init():void { 
// Load an image and add it to the display list. 
var loader:Loader = new Loader(); 
var url:URLRequest = new URLRequest("images/ZionsMap.png"); 
loader.load(url); 
this.stage.addChild(loader); 
    // Create a Sprite. 
var oval:Sprite = new Sprite(); 
// Draw a gradient oval. 
/* var colors:Array = [0x000000, 0x000000]; 
var alphas:Array = [1, 0]; 
var ratios:Array = [0, 255]; 
var matrix:Matrix = new Matrix(); 
matrix.createGradientBox(200, 100, 0, -100, -50); 
    oval.graphics.beginGradientFill(GradientType.RADIAL, 
            colors, 
            alphas, 
            ratios, 
            matrix); */ 
oval.graphics.beginFill(0xFFFFFF,1.0); 
oval.graphics.drawEllipse(-200, -50, 200, 200); 
oval.graphics.endFill(); 
// add the Sprite to the display list 
this.stage.addChild(oval); 
// Set cacheAsBitmap = true for both display objects. 
//loader.cacheAsBitmap = true; 
//oval.cacheAsBitmap = true; 
// Set the oval as the mask for the loader (and its child, the loaded image) 
loader.mask = oval; 
// Make the oval draggable. 
oval.startDrag(true); 
} 
]]> 
</mx:Script> </mx:Application>

但我不確定如何有超過「在」圖像縮放頂部的縮小「走出去」的形象。當前可拖動蒙版將通過縮小圖像顯示放大圖像。有小費嗎？

來源

2011-03-08 Eponine