objectArx开发用的。C++语言。objectarx的库函数。有04到15版本的哦-ObjectArx development use.C++ language.Objectarx library functions.There are 4 to 15 version of oh

qt-cad, cad 开源项目，基于qt实现，里面有很多可以借鉴学习的部分，比如几何部分的算法等-cad project wroten by qt, good for learning