example-CircularEngine.cpp

using namespace System;
using namespace NETGeographicLib;

int main(array<System::String ^> ^/*args*/)
{
    // This computes the same value as example-SphericalHarmonic.cpp using a
    // CircularEngine (which will be faster if many values on a circle of
    // latitude are to be found).
    try {
        int N = 3;                  // The maxium degree
        array<double>^ ca = {10, 9, 8, 7, 6, 5, 4, 3, 2, 1}; // cosine coefficients
        array<double>^ sa = {6, 5, 4, 3, 2, 1}; // sine coefficients
        double a = 1;
        SphericalHarmonic^ h = gcnew SphericalHarmonic(ca, sa, N, a, SphericalHarmonic::Normalization::SCHMIDT);
        double x = 2, y = 3, z = 1, p = Math::Sqrt(x*x+y*y);
        CircularEngine^ circ = h->Circle(p, z, true);
        double v, vx, vy, vz;
        v = circ->LongitudeSum(x/p, y/p, vx, vy, vz);
        Console::WriteLine(String::Format("{0} {1} {2} {3}", v, vx, vy, vz));
    }
    catch (GeographicErr^ e) {
        Console::WriteLine(String::Format("Caught exception: {0}", e->Message));
        return -1;
    }
    return 0;
}