本次作业要求你完整实现一个简单的2D样条曲线编辑器。该编辑器应支持Bezier曲线和B样条曲线, 可以实现两种曲线的转换(仅对四个控制点的双三次样条曲线)。在你的曲线程序能工作后，将转到由这些曲线来产生曲面：旋转曲面和双三次Bezier 片.(This assignment requires you to implement a simple 2D spline editor. The editor should support the Bezier curve and the B spline curve, and you can achieve the conversion of the two curves (only the double three spline curve of the four control points). After your curve program can work, you'll go through the curves to produce surfaces: rotating surfaces and double three Bezier slices)