CGContextRef用法
http://blog.csdn.net/wmqi10/article/details/8730352
iOS重绘机制drawRect
http://blog.csdn.net/fww330666557/article/details/8647608
iOS CGContextRef画图小结
http://blog.sina.com.cn/s/blog_9693f61a0101deko.html
iOS使用CGContextRef绘制各种图形
http://www.devstore.cn/essay/essayInfo/116.html
iOS用CGContextRef画各种图形(文字、圆、直线、弧线、矩形、扇形、椭圆、三角形、圆角矩形、贝塞尔曲线、图片)
http://blog.csdn.net/rhljiayou/article/details/9919713
CGContextDrawImage画图图形相反镜像
http://blog.csdn.net/koupoo/article/details/8670024
drawRect:和- (void)setNeedsDisplay的一些理解
http://www.cnblogs.com/pengyingh/articles/2383688.html
iOS画图以及清空
http://blog.csdn.net/woshidaniu/article/details/46683409
drawRect自动清除屏幕
http://www.cocoachina.com/bbs/read.php?tid=7085
drawRect中,如何清除之前所绘制的内容
http://www.cocoachina.com/bbs/read.php?tid=28302&page=e&#a
drawRect中,如何清除之前所绘制的内容
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