geometry:convexhull-by-graham-scan
说明:graham-scan算法计算点集凸包参数: pts:点表
用法:
(geometry:convexhull-by-graham-scan pts)参数:1 pts : 多个坐标点列表;
返回值:凸包点表
示例:
(geometry:convexhull-by-graham-scan '(pt1 pt2 pt3 ...))
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