curve:3pt2bulge-plus

说明:三点求凸度,任意两点的垂线的交点即圆心。增加pt2是否在圆弧上的判断

用法:
 (curve:3pt2bulge-plus pt1 pt2 pt3)

参数:1 pt1 : 单个2D/3D坐标点;2 pt2 : 单个2D/3D坐标点;3 pt3 : 单个2D/3D坐标点;

返回值:number

示例:
(curve:3pt2bulge-plus (getpoint)(getpoint)(getpoint))