在实际使用之前,还是需要测试一下图形引擎的效率吧。当然,也同时体验一下开发效率。
设计一个最简单的场景:在一个背景上,有许多的UFO在飞,这些UFO都与背景进行某种层度的Alpha混合。测试画面如下:
程序结构很简单:
其中,Sprite、BitmapAsset、MovieClipAsset是ActionScript3所提供的基类。我们需要编写的是ExUfo和UfoSprite这两个Sprite。至于BackClass和UfoClass则是背景图片和飞碟动画的实体类,只需要在程序中定义就可以使用了。
ExUfo类:
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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UfoSprite类:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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编译
如果使用Flex2 SDK,则在Flex2SDK的命令行提示中打入:
D:\test\exUfo>mxmlc -use-network=true -default-size 800 600 -default-frame-rate30 exUfo.as
执行结果为:
Loading configuration file C:\Program Files\Adobe\Flex Builder 2\Flex SDK 2\frameworks\flex-config.xml
D:\test\exUfo\exUfo.swf (84431 bytes)
如果使用Flex2 Builder,应创建ActionScriptProject,然后创建ActionScriptFile(也就是*.as文件),然后需在编译器的选项中加入“-default-size 800 600 -default-frame-rate30”,目的是为了让生成的swf文件,按照800*600的尺寸,帧率以30fps为基准。
源代码包含完整的Flex Builder 2项目,可以直接在Flex Builder 2打开。
示例(安装Flash9浏览器插件):点鼠标左键一次,增加一个飞碟。
示例文件下载:
http://www.cnblogs.com/images/cnblogs_com/ly4cn/exUfo.swf
完整的代码下载:
https://files.cnblogs.com/ly4cn/exUfo.rar
Flex2 SDK 和 Flex2 Builder 试用版下载:http://www.adobe.com/cn/products/flex/?promoid=BINV
Flex2 Builder包含了Flex2 SDK,以及一个Flash9的独立播放器。