《用VB_NET和VC#_NET开发交互式CAD系统》（请用超星阅览器打开）本书共有十二章，内容包括面向对象编程、基本图元类设计、交互绘图类设计、图元的编辑、图元变换、相交图元、优化处理等。-《Interactive CAD system developed using VB_NET VC# _NET》The book consists of 12 chapters, including object-oriented programming, basic class design, the d