断面绘制Lisp源代码，自带有 纵横断面原始数据示例，可以参考学习。-Section draws Lisp source code comes with the original data of the vertical and horizontal cross-section sample, can refer to the study.

opendwg库文件，包含库，说明文档，以及示例代码！-opendwg library file that contains the library, documentation, and sample code!