http://blog.csdn.net/xhhjin/article/details/6444782
http://blog.csdn.net/xhhjin/article/details/6445460http://www.cnblogs.com/graphics/archive/2012/08/23/2643086.htmlhttp://www.oschina.net/code/snippet_1425046_27446本文共 217 字，大约阅读时间需要 1 分钟。
http://blog.csdn.net/xhhjin/article/details/6444782
http://blog.csdn.net/xhhjin/article/details/6445460http://www.cnblogs.com/graphics/archive/2012/08/23/2643086.htmlhttp://www.oschina.net/code/snippet_1425046_27446