polygon window meaning in Chinese

多边形窗口

Second , after limitations of present algorithms are analyzed , two improved clipping algorithms of polygon against rectangle window and line against polygon window are presented
其次在分析现有算法不足的基础上提出了矩形窗口多边形裁剪和一般多边形窗口线裁剪的改进算法。
The new line against polygon window clipping algorithm which makes full use of two judgement conditions to confirm noneffective intersections between the lines and the polygon edges can only calculate the effective intersections and increases the efficiency of the clipping . third , a new 3 - d clipping algorithm of line against spherical surface window is introduced for the first time
一般多边形窗口线裁剪的改进算法充分利用确定被裁线段与多边形边无交的两个判断条件，对完全不可见线段以及与被裁线段无有效交点的多边形边进行了排除，只有当线段与多边形边有有效交点时才求交，避免了不必要的求交，提高了算法效率。