AS3.0图片加载的方式

 

下面介绍了两种图片加载处理的不同方式了，在工作中我们是经常遇到的，在不同的环境用途下使用的方式也是不同的，

 1 package net.burchin.loading {
 2     import flash.display.Sprite;
 3     import flash.display.Bitmap;
 4     import flash.display.BitmapData;
 5     import flash.display.Loader;
 6     import flash.display.LoaderInfo;
 7     import flash.text.TextField;
 8     import flash.net.URLRequest;
 9     import flash.events.Event;
10     import flash.events.ProgressEvent;
11     import flash.geom.Matrix;
12     public class LoadingDoc extends Sprite {
13         private var _imageData:BitmapData;    //图片
14         private var _loader:Loader;    //装载
15         private var _rate:TextField;    //进度显示
16         public function LoadingDoc() {
17             init();
18             _rate.text = '开始下载';
19             _rate.autoSize = 'center';
20             _rate.textColor = 0x000000;
21             _rate.x = (stage.stageWidth - _rate.width)/2;
22             _rate.y = (stage.stageHeight - _rate.height)/2;
23             this.addChild(_rate);
24             sendRequest('images/flower.jpg');
25         }
26         //初始化
27         private function init() {
28             _imageData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0xFFFFFFFF);
29             _loader = new Loader();
30             _rate = new TextField();
31         }
32         //发送请求
33         private function sendRequest(p_url:String) {
34             var m_request = new URLRequest(p_url);
35             _loader.load(m_request);
36             _loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
37             _loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgress);
38         }
39         //事件，下载完毕
40         private function onComplete(e:Event) {
41             _imageData.draw(_loader, new Matrix(stage.stageWidth/_loader.width, 0, 0, stage.stageHeight/_loader.height, 0, 0));
42             var m_image:Bitmap = new Bitmap(_imageData);
43             this.removeChild(_rate);
44             this.addChild(m_image);
45         }
46         //事件，下载中
47         private function onProgress(e:Event) {
48             var m_info:LoaderInfo = e.target as LoaderInfo;
49             var m_percent:uint = (m_info.bytesLoaded/m_info.bytesTotal)*100;
50             _rate.text = '已经下载'+m_percent.toString()+'%';
51         }
52     }
53 }

 

另一种：

 1 package net.burchin.loading {
 2     import flash.display.Sprite;
 3     import flash.display.BitmapData;
 4     import flash.display.Bitmap;
 5     import flash.display.Loader;
 6     import flash.net.URLRequest;
 7     import flash.net.URLLoader;
 8     import flash.net.URLLoaderDataFormat;
 9     import flash.utils.ByteArray;
10     import flash.events.Event;
11     import flash.geom.Matrix;
12     public class LoadingByByteArrayDoc extends Sprite {
13         private var _imageData:BitmapData;    //图片数据
14         private var _loader:Loader;    //装载
15         public function LoadingByByteArrayDoc():void {
16             init();
17             sendRequest('images/flower.jpg');
18         }
19         //初始化
20         private function init():void {
21             _imageData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0xFFFFFFFF);
22             _loader = new Loader();
23         }
24         //发送请求
25         private function sendRequest(p_url:String):void {
26             var m_request:URLRequest = new URLRequest(p_url);
27             var m_loader:URLLoader = new URLLoader();
28             m_loader.dataFormat = URLLoaderDataFormat.BINARY;
29             m_loader.addEventListener(Event.COMPLETE, onSendComplete);
30             m_loader.load(m_request);
31         }
32         //事件，请求发送完毕
33         private function onSendComplete(e:Event):void {
34             var m_content:ByteArray = e.target.data as ByteArray;
35             _loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
36             _loader.loadBytes(m_content);
37         }
38         //事件，装载完毕
39         private function onLoadComplete(e:Event):void {
40             _imageData.draw(_loader, new Matrix(stage.stageWidth/_loader.width, 0, 0, stage.stageHeight/_loader.height, 0, 0));
41             var m_image:Bitmap = new Bitmap(_imageData);
42             this.addChild(m_image);
43         }
44     }
45 }