AutoCAD中圆弧折线化方法与实现

AutoCAD作为一种重要的地形图制图软件,图中存在大量的圆弧图元。由于圆弧只有端点或圆心坐标,弧线本身缺乏精确的坐标信息,因此导致一些数据检查时出错。Auto CAD软件本身不提供圆弧转折线的功能。本文尝试采用等角切分方法,利用VBA二次开发技术,在保持图形原有特征及精度要求的前提下,将圆弧、圆及多段线中的圆弧分别转换为纯折线的多段线,从而去除圆弧部分。满足基础地理信息数据库建库等特殊的数据需求。

The Method of Converting the Arc Into Broken Lines and its Implementation in AutoCAD

As an important topographic map mapping software,AutoCAD contains a lot of arc graphic elements in the graph. Due to the arc only include endpoint or the coordinates of the center of circle,and the arc itself do not has accu-rate coordinate information which leading to some error when checking data. But AutoCAD software itself does not provide the function of change arc into broken lines. In this paper,we try to propose a new method for dividing the arc into broken lines. In the proposed method,equiangular segmentation algorithm is used and VBA language is adopted for algorithm de-veloping;it can maintains the original feature and the accuracy of the figure,and convert the arc of the circle and the arc of the multi-lines into the multi section lines of the pure line,respectively,thereby the arc part is removed. The proposed method can meet the special needs of basic geographic information database construction.