计算任意线段长度，包括直线、多段线、曲线等任意线段的长度。-Calculate the length of any segment, including linear, polylines, curves and other arbitrary length of the segment.

读取DXF文件和保存DXF文件,处理通用实体，并且加入了Polygon和Polyface的接口-his is not a complete DXF reader package, but it handles most entities that are commonly found. With this release I ve added the Polygon mesh and Polyface mesh varieties of POLYLINE, so a great

实现幕墙分格的：定数等分，定距等分，任意分格，极限等分，定距等分多余分到两边，定距等分多余的分到中间。可对直线、圆弧、多段线进行操作(The realization of curtain wall partition is as follows: fixed number equal division, fixed distance equal division, arbitrary division, limit equal division, fixed distance equal div