对二维平面内的圆曲线进行拟合计算，调用拟合函数Circle_Fit(）前需要给定圆心、半径一个初始值，以便快速迭代解算结果。-Fitting calculation of the circular curve in the two-dimensional plane, call () before fitting function Circle_Fit need to be given to the center of the circle, the radius of the initial