设实际圆心坐标为(A,B)。为了求某一截面圆的半径,我们可按下列步骤进行迭代计算。
首先,假定该截面圆的圆心坐标初始值为:A0=0,B0=0;
代码如下:
void CFitCircleDlg::Iteration(double &x,double &y, double &R)
{
double A0=0.0,B0=0.0,R0=0.0,R1,A1,B1,Ri,r;
double X=0.0,Y=0.0,X1=0.0,Y1=0.0;
int count,i,j,k;
Point node,point;
count=m_PointDataArray.GetSize();
R1=0.0;
for (i=0;i<count;i++)
{
node=m_PointDataArray.GetAt(i);
R1+=sqrt((node.East-A0)*(node.East-A0)+(node.North-B0)*(node.North-B0));
}
r=R0;
while(fabs(R1-r)>0.0001)
{
R1=0.0;
for (k=0;k<count;k++)
{
node=m_PointDataArray.GetAt(k);
R1+=sqrt((node.East-A0)*(node.East-A0)+(node.North-B0)*(node.North-B0));
}
X=0.0;
X1=0.0;
Y=0.0;
Y1=0.0;
for(j=0;j<count;j++)
{
point=m_PointDataArray.GetAt(j);
Ri=sqrt((point.East-A0)*(point.East-A0)+(point.North-B0)*(point.North-B0));
X+=point.East;
X1+=(point.East-A0)/Ri;
Y+=point.North;
Y1+=(point.North-B0)/Ri;
}
A1=X/count-R1/count*X1;
B1=Y/count-R1/count*Y1;
if (fabs(R1-R0)>0.0001)
{
r=R0;
R0=R1;
A0=A1;
B0=B1;
}
else
break;
}
R=R1;
x=A1;
y=B1;
}
不知道在哪里弄错了,往各位指点。