curve_test is a set of 3 programs to demonstrate 3 different kind of third-order parametric curves: Hemite curve segments, Bezier curve segments, and Splines. Hemite curves are defined by two endpoints and two vectors, Bezier curves are defi

特征提取：重点是几何特征环,交叉点,端点和变换 不错的-Feature extraction: with a focus on the geometric feature of ring, intersection, endpoints, and transform is good