实现映射的映射

代码说明：

VC实现的绘制B样条曲线曲面的小软件,可绘制均匀,准均匀B样条和贝塞尔曲线曲面,鼠标点取控制点可调节曲线曲面的形状-VC realize the mapping B-spline curves and surfaces of the small software rendering uniform, quasi-uniform B-spline and Bezier curves and surfaces, mouse point adjustable from the control point of the shape of curves and surfaces