公路平面图制图系统的坐标转换

Coordinate Transformation of Highway Ichnography Drawing System

在利用 Auto CAD绘制公路平面图的过程中 ,依据桩号和距中线距离直接绘图能够提高绘图速度和准确性。基于 VBA语言设计了一种新算法 ,实现了用户坐标系 (UCS)与以中线为参照的相对坐标系 (midline relative coordinate system,MRCS)之间的坐标转换。最后给出了两个典型应用实例。

In the process of drawing highway ichnography in AutoCAD, drawing directly accor ding to stake and the distance to midline can promote speed and accuracy of draw ing. In this paper, a VBA oriented algorithm is introduced, which realizes the c oordinate transformation between the user coordinate system (UCS) and the relati ve coordinate system based on midline (MRCS). In the end, this paper gives two typical examples of application.