基于VC的构件相贯线绘制系统的设计

钣金构件CAD系统需要绘制零件工作图,这就要绘制构件的相贯线,但是相贯线的绘制比较麻烦,特别是内相贯线的绘制,常常需要求出可见的内相贯线的临界点.以圆柱三通管为实例,重点分析并求出它的内相贯线在俯视图中的投影方程,对此方程进行坐标转换得到它在AutoCAD世界坐标系中的方程,并用基于ObjectARX的VC程序对内相贯线进行了绘制.

Design of Piece Intersection-line Drawing System Based on VC

The CAD style of sheet metal piece may draw hardware working drawing with piece intersection line,but it is hard to draw the piece intersection line,especially inner piece intersection line because of computing critical points of eyeable inner intersection line.This paper takes three-way point of the cylinder for example to analyze and find the projection equations of the inner intersection lines in the its plan form and converts them into new ones in the world coordinates of AutoCAD,and then VC programs based on Objectarx is used to draw the inner intersection lines.