iOS 曲线拟合
iOS 曲线拟合
http://sourceforge.net/projects/curve/
https://github.com/gerhardsletten/ios_curves
https://github.com/levinunnink/Smooth-Line-View
http://tonyngo.net/2011/09/smooth-line-drawing-in-ios/
http://devmag.org.za/2011/04/05/bzier-curves-a-tutorial/
http://stackoverflow.com/questions/4606680/drawing-app-on-ipad-using-ope...