鼠标画曲线， 然后提取特征点，将提取的特征点由bezier曲线进行拟合， 然后得到最终的拟合曲线， 拟合的曲线可以通过调整曲线的控制点来调整曲线的形状-And then extract the feature points, the feature points extracted by the bezier curve fitting, and then get the final fitting curve, the curve can be adjusted by adjusting th