本文主要是介绍【运动控制】三点定圆，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
//三点定圆
EXTERN_C short WINAPI _Point3(unsigned short Axis,double dDistX1,double dDistY1,double dDistX2,double dDistY2,double dDistX3,double dDistY3,short Position_Mode = 0, unsigned short CardNum = 0)
{double mat1,mat2,mat3; //参数double center1, center2; //求出圆心坐标double k,b; //直线斜率k； y=kx+bdouble direction; //求出方向short stat = 0;unsigned short rtn;rtn = MCF_Switch_Card(CardNum);if (rtn != 0){return rtn;}unsigned short temp[MaxAxis] = {0};unsigned short AxisNum=0;stat = MultiAxis_BitToDate(Axis,&AxisNum,&temp[AxisNum]);if (8 == stat){return 8;}if (fabs(dDistX1-dDistX2) < 0.000001) //第一个点与第二个点的直线垂直于X轴{if (fabs(dDistX3-dDistX2) < 0.000001){return 8;}else{if (dDistX3 > dDistX1){direction = 0;}else{direction = 1;}}}else{k = (dDistY2-dDistY1)/(dDistX2-dDistX1);b = dDistY1-k*dDistX1;if (fabs(k*dDistX3+b-dDistY3) < 0.000001) //第三个点在直线上，return 8{return 8;}else{if (k*dDistX3+b > dDistY3) //第三个点在直线下方——顺时针{direction = 0;}elsedirection = 1; //第三个点在直线上方——逆时针}}mat1=((dDistX2*dDistX2)+(dDistY2*dDistY2)-(dDistX1*dDistX1+dDistY1*dDistY1))*(2*(dDistY3-dDistY1))-((dDistX3*dDistX3+dDistY3*dDistY3)-(dDistX1*dDistX1+dDistY1*dDistY1))*(2*(dDistY2-dDistY1));mat2=(2*(dDistX2-dDistX1))*((dDistX3*dDistX3+dDistY3*dDistY3)-(dDistX1*dDistX1 +dDistY1*dDistY1))- (2*(dDistX3-dDistX1))*((dDistX2*dDistX2+dDistY2*dDistY2)-(dDistX1*dDistX1 +dDistY1*dDistY1));mat3 = 4*((dDistX2-dDistX1)*(dDistY3-dDistY1) - (dDistX3-dDistX1)*(dDistY2-dDistY1)); center1 = mat1/mat3;center2 = mat2/mat3;dDistX1 = dDistX1*EquivalentMolecule[CardNum][temp[0]]/EquivalentDenominator[CardNum][temp[0]];dDistY1 = dDistY1*EquivalentMolecule[CardNum][temp[1]]/EquivalentDenominator[CardNum][temp[1]];dDistX2 = dDistX2*EquivalentMolecule[CardNum][temp[0]]/EquivalentDenominator[CardNum][temp[0]];dDistY2 = dDistY2*EquivalentMolecule[CardNum][temp[1]]/EquivalentDenominator[CardNum][temp[1]];dDistX3 = dDistX3*EquivalentMolecule[CardNum][temp[0]]/EquivalentDenominator[CardNum][temp[0]];dDistY3 = dDistY3*EquivalentMolecule[CardNum][temp[1]]/EquivalentDenominator[CardNum][temp[1]];center1 = center1*EquivalentMolecule[CardNum][temp[0]]/EquivalentDenominator[CardNum][temp[0]];center2 = center2*EquivalentMolecule[CardNum][temp[1]]/EquivalentDenominator[CardNum][temp[1]];if (dDistX1 > 2147483648){return 26;}if (dDistY1 > 2147483648){return 26;}if (dDistX2 > 2147483648){return 26;}if (dDistY2 > 2147483648){return 26;}if (dDistX3 > 2147483648){return 26;}if (dDistY3 > 2147483648){return 26;}return stat;
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