对平面图形进行内外裁剪的统一算法

An Algorithm for the Inside and Outside Cut-off of Geometrical Pattern

通过平面图形和裁剪边界交点的有效性和出入性，设计一种新的算法，不需要 对图形进行任何的预处理，就可以对各种图形和裁剪窗口进行统一的内、外裁剪。

Based on the effective property and In-and-out property of geometrical pattern, this paper exhibits a new algorithm which can simultaneously deal with inside and outside cut-off of a geometrical pattern within a working window wit hout any pre-processing.