该程序只是为了验证 iPhone 的应用程序开发，学习 iPhone 的开发人员不妨看看。该项目主要包含 iPhone 的一些编程概念包括：
MVC patterns: this application uses the Interface Builder and an MVC approach to modeling a polygon shape.
Custom UIViews and Drawing: Using Quartz2D, this program renders a polygon based on user actions. This is done using a child of the UIView class and overriding the drawRect: method.
Animation: using an NSTimer this application animates the active polygon. This uses the Affine transforms in Quartz2D.
Multi-touch: detects swipes to allow the user to speed up or slow down the spinning of the animated polygon.
项目主页：http://code.google.com/p/iphone-poly-demo/
下载地址：http://code.google.com/p/iphone-poly-demo/downloads/list
来自:oschina开源中国社区
