圆形窗口各种图素的剪裁算法

Clipping algorithms for various graphic elements against circular window

对圆形窗口剪裁各种图素进行了系统研究，得到直线段、圆弧剪裁的两个可视判断命题，给出了圆形窗口剪裁直线段、圆和弧的各种算法．实验表明给出的算法是高效的．

Based on the systematicaly research of various relations between the various graphic elements and circular window, two visible judgement propositions of the line segmentation and the arc are obtained. The various clipping algorithms for the line segmentation and the circle and the arc against circular window are given.The experimental evidence shows that the algorithms given here are efficient.