这个是整合的绘图系统，模仿autoCAD功能的程序，而且提供浮动的工具栏，对于画线，画矩形，画曲线，画常用的形状，都已经实现了，是学习vc++的好例子。-This is the integrated graphics system, mimic the the autoCAD function program, and the floating toolbar, draw lines, draw a rectangle, draw curve, draw commonly used shapes