本文主要是介绍AS3基础-放大镜，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
预览图片时，我们常常用到的放大镜效果：
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.events.Event;
import flash.filters.BlurFilter;
import flash.net.URLRequest;/**
*
* @author hacker47...
*/
public class Main extends MovieClip
{private var bitmap:Bitmap;private var bitmap2:Bitmap;private var shape:Sprite = new Sprite();private var loader:Loader;public function Main() {loader = new Loader();loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);loader.load(new URLRequest("assets/child.jpg"));}private function onLoadComplete(e:Event):void {bitmap = e.target.content as Bitmap;addChild(bitmap);initMap();}private function initMap() {var bitdata:BitmapData = bitmap.bitmapData;var bitdata2:BitmapData = bitdata.clone();bitmap.scaleX = bitmap.scaleY = 0.9;bitmap.x = stage.stageWidth / 2 - bitmap.width / 2;bitmap.y = stage.stageHeight / 2 - bitmap.height / 2;bitmap2 = new Bitmap(bitdata2);addChild(bitmap2);bitmap2.cacheAsBitmap = true;bitmap2.x = stage.stageWidth / 2 - bitmap2.width / 2;bitmap2.y = stage.stageHeight / 2 - bitmap2.height / 2;addMaskShap();}private function addMaskShap() {with (shape.graphics) {beginFill(0x000000);drawCircle(0, 0, 100);endFill();}addChild(shape);shape.buttonMode = true;shape.cacheAsBitmap = true;shape.filters = [new BlurFilter(5,5)];bitmap2.mask = shape;addEventListener(Event.ENTER_FRAME, enterFrame);}private function enterFrame(e:Event) {shape.x += (mouseX - shape.x) / 10;shape.y += (mouseY - shape.y) / 10;}}}
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