跨平台跨编译器的c++绘图框架，支持无限Undo和Redo，诸多设计模式的结合使用，可以很方便的进行扩展。-cross-platform cross-compiler of c Mapping framework to support unlimited Undo and Redo. many of the design patterns used in conjunction, can facilitate the expansion.

本文利用MFC类库，利用设计模式的思想实现了画图工具。可以画直线、圆、椭圆、矩形、填充等-this system can draw shape by Design Patterns methods.

利用设计模式写的简单画图程序，用到了几个模式-The use of design patterns written in a simple drawing program using several models