实现曲线(三次贝塞尔曲线,三次B样条曲线,三叶梅花线,圆锥\圆柱螺线),曲面(贝塞尔曲面,B样条曲面,环形曲面,旋转曲面)等功能.-Curve (cubic Bezier curve, cubic B-spline curves, clover Plum Line, cone \ cylindrical spirals), surfaces (Bezier, B-spline surfaces, annular curved surface of revolution).