三个点拟合圆形的函数

函数说明

public void FitCircleFromThreePoints(double 点1X, double 点1Y, double 点2X, double 点2Y, double 点3X, double 点3Y, out double 圆心X坐标, out double 圆心Y坐标, out double 圆形半径大小)

 public void FitCircleFromThreePoints(double Points1X, double Points1Y, double Points2X, double Points2Y, double Points3X, double Points3Y, out double Col, out double Row, out double Rad)
        { 
            try
            { 
            //先判断一下这三个点是否共线，如果共线就不求了。
                if ((Points1X - Points2X) / (Points1Y - Points2Y) == (Points2X - Points3X) / (Points2Y - Points3Y))
                { 
                Col = 0;
                Row = 0;
                Rad = 0;
                    return ;
                }
                //求圆形
                double x1, y1, x2, y2, x3, y3;
                double a, b, c, g, h, f;
                x1 = Points1X;
                y1 = Points1Y;
                x2 = Points2X;
                y2 = Points2Y;
                x3 = Points3X;
                y3 = Points3Y;
                h = 2 * (x2 - x1);
                f = 2 * (y2 - y1);
                g = x2 * x2 - x1 * x1 + y2 * y2 - y1 * y1;
                a = 2 * (x3 - x2);
                b = 2 * (y3 - y2);
                c = x3 * x3 - x2 * x2 + y3 * y3 - y2 * y2;
                Col = (g * b - c * f) / (h * b - a * f);
                Row = (a * g - c * h) / (a * f - b * h);
                Rad = Math.Sqrt((Col - x1) * (Col - x1) + (Row - y1) * (Row - y1));
            }
            catch
            { 
                Col = 0;
                Row = 0;
                Rad = 0;
            }
        }

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