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本文研究了一种实用的二维图形集合运算的自动实现的方法。参加集合运算的图形可以是屏幕上所画图形的一部分，该图形的数据由图中自动提取。提出了扫描线算法，用于自动搜索集合运算图形的内、外轮廓。
This paper studies a practical method of automatic realization of two-dimensional graphics collection operations. The graph that participates in the set operation can be a part of the graph drawn on the screen, and the graph data is automatically extracted from the graph. A scanning line algorithm is proposed to automatically search the inner and outer contours of a set of operation graphics.