用MFC做的可以实现画三种平滑曲线的程序(三次样条插值，贝塞尔曲线，GDI+曲线平滑)-Using MFC to do three pictures to achieve a smooth curve of the procedure (cubic spline interpolation, Bezier curves, GDI+ curve smoothing)

三次Beizer曲线方程，找到轮廓中的特征点，然后根据两个相邻的特征点拟合成一段三次Beizer曲线，控制点AB是借助周围几个点得到的(In the three Beizer curve equation, the feature points in the contour are found, and then a three Beizer curve is synthesized according to two adjacent feature points. The control po