摘要
本文描述了计算机对空间共面的任意二多边形的交集处理问题，着重阐述了当二多边形的若干条棱边共线时的点的处理问题。
The problem of intersection collection about the two free polygons on same plane treated with a computer is described. The problem of those points to be handled when several edges of the two polygons are on same line is explained chiefly.
关键词
共线
计算机制图
多地形
交集处理
intersection
collection
common line
normal
edge
dot product
