public static PointPolar PtdDecartToPolar(PointD decartPointD, PointD center, PointD zeroAnglePoint)
{
double diffX = zeroAnglePoint.X - center.X;
double diffY = zeroAnglePoint.Y - center.Y;
double zeroAnglePointR = Math.Sqrt(diffX * diffX + diffY * diffY);
double zeroAngle = 0.0d;
if (zeroAnglePointR != 0.0d)
{
zeroAngle = Math.Acos(diffX / zeroAnglePointR);
if (diffY >= 0)
{
zeroAngle = 2.0d * Math.PI - zeroAngle;
}
}
PointPolar polarPointD = new PointPolar();
diffX = decartPointD.X - center.X;
diffY = decartPointD.Y - center.Y;
polarPointD.R = Math.Sqrt(diffX * diffX + diffY * diffY);
polarPointD.Phi = Math.Acos(diffX / polarPointD.R);
if (diffY >= 0)
{
polarPointD.Phi = 2.0d * Math.PI - polarPointD.Phi;
}
polarPointD.Phi -= zeroAngle;
polarPointD.CropAngle(true);
return(polarPointD);
}
public static List <PointPolar> ListDecartToPolar(List <PointD> decartPointdList, PointD center, PointD zeroAnglePoint, out double zeroAngleValue)
{
double diffX = zeroAnglePoint.X - center.X;
double diffY = zeroAnglePoint.Y - center.Y;
double zeroAnglePointR = Math.Sqrt(diffX * diffX + diffY * diffY);
double zeroAngle = 0.0d;
if (zeroAnglePointR != 0.0d)
{
zeroAngle = Math.Acos(diffX / zeroAnglePointR);
if (diffY >= 0)
{
zeroAngle = 2.0d * Math.PI - zeroAngle;
}
}
zeroAngleValue = zeroAngle;
List <PointPolar> retList = new List <PointPolar>();
foreach (PointD curPointDecart in decartPointdList)
{
PointPolar polarPointD = new PointPolar();
diffX = curPointDecart.X - center.X;
diffY = curPointDecart.Y - center.Y;
polarPointD.R = Math.Sqrt(diffX * diffX + diffY * diffY);
polarPointD.Phi = Math.Acos(diffX / polarPointD.R);
if (diffY >= 0)
{
polarPointD.Phi = 2.0d * Math.PI - polarPointD.Phi;
}
polarPointD.Phi -= zeroAngle;
polarPointD.CropAngle(true);
retList.Add(polarPointD);
}
return(retList);
}
