三個點擬合圓形的函數

函數說明

public void FitCircleFromThreePoints(double 點1X, double 點1Y, double 點2X, double 點2Y, double 點3X, double 點3Y, out double 圓心X坐標, out double 圓心Y坐標, out double 圓形半徑大小) 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{//先判斷一下這三個點是否共線，如果共線就不求了。if ((Points1X - Points2X) / (Points1Y - Points2Y) == (Points2X - Points3X) / (Points2Y - Points3Y)){Col = 0;Row = 0;Rad = 0;return ;}//求圓形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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