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// Example of using the GeographicLib::CircularEngine class
#include <iostream>
#include <exception>
#include <vector>
#include <GeographicLib/CircularEngine.hpp>
#include <GeographicLib/SphericalHarmonic.hpp>
using namespace std;
using namespace GeographicLib;
int main() {
// 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
double ca[] = {10, 9, 8, 7, 6, 5, 4, 3, 2, 1}; // cosine coefficients
vector<double> C(ca, ca + (N + 1) * (N + 2) / 2);
double sa[] = {6, 5, 4, 3, 2, 1}; // sine coefficients
vector<double> S(sa, sa + N * (N + 1) / 2);
double a = 1;
SphericalHarmonic h(C, S, N, a);
double x = 2, y = 3, z = 1, p = Math::hypot(x, y);
CircularEngine circ = h.Circle(p, z, true);
double v, vx, vy, vz;
v = circ(x/p, y/p, vx, vy, vz);
cout << v << " " << vx << " " << vy << " " << vz << "\n";
}
catch (const exception& e) {
cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
return 0;
}
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