说明：  使用perl语言编写的CAD图形格式转换程序，用以提取DXF平面图中的线型，并转换为Gambit、gmsh和ANSYS等分析需要的输入格式，可以转化直线、多线段、圆(弧)、椭圆、样条线，附带了一个简单的例子
(A CAD graphics format conversion program written in Perl language is used to extract the line type in DXF plane drawing and convert it into the input format needed for analysis such as Gambit, Gmsh and ANSYS. It can transform straight line, multi-line segment, circle (arc), ellipse and spline. A simple example is attached.)