C++ src for simple b-spline curve algorithm

根据空间任意点数坐标拟合得到空间样条曲线，特别适合测量实际孔轴线拟合。-According to the spatial coordinates of any point of space-spline curve fitting, especially suitable for measuring the actual hole axis fitting.

用于将圆弧或样条曲线转化为多段线，Auto CAD VBA-Arc or spline curve is used to translate into polylines, Auto CAD VBA