今天在autodesk讨论组中看到一个话题: 大意如下:给出一个点,如何得到离该点最近的且包含这点的封闭曲线。(circle,polyline....),如果有,返回该曲线图元名,如果不存在包含这点的封闭曲线,则返回nil值。 I am familiar with some methods to determine if a point is inside a given polyline... but I am looking to find... or create... a function to select a closed polyline given a point which is inside its space... if the point is not within a closed polyline then returns nil. Gilles Chanteau给出了一个lisp程序,但并不很准确,有时会出错。 如果对这个题目有兴趣的话,不妨讨论一下. |