ios 小画板功能 ：撤销擦除，橡皮擦，重画和回撤功能，支持保存图片，加载图片！-ios small sketchpad function: revocation erase, eraser, repaint and retracement functional support to save the image, load the image!

CartoType是一个渲染和路径规划库，这里是一个DEMO。-CartoType ([1]) is a renderer and routing library. Available now for Windows, Windows Mobile, iOS, MacOS, Android, Linux (and FreeBSD and other versions of Unix) and Symbian OS. Both map rendering and routing are usual