ADD: new track message, Entity class and Position class

libs/geographiclib/examples/example-SphericalHarmonic2.cpp

@@ -0,0 +1,37 @@
+// Example of using the GeographicLib::SphericalHarmonic2 class
+
+#include <iostream>
+#include <exception>
+#include <vector>
+#include <GeographicLib/SphericalHarmonic2.hpp>
+
+using namespace std;
+using namespace GeographicLib;
+
+int main() {
+  try {
+    int N = 3, N1 = 2, N2 = 1;                     // The maxium degrees
+    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 cb[] = {1, 2, 3, 4, 5, 6};
+    vector<double> C1(cb, cb + (N1 + 1) * (N1 + 2) / 2);
+    double sb[] = {3, 2, 1};
+    vector<double> S1(sb, sb + N1 * (N1 + 1) / 2);
+    double cc[] = {2, 1};
+    vector<double> C2(cc, cc + (N2 + 1));
+    vector<double> S2;
+    double a = 1;
+    SphericalHarmonic2 h(C, S, N, N, N, C1, S1, N1, N1, N1,
+                         C2, S2, N2, N2, 0, a);
+    double tau1 = 0.1, tau2 = 0.05, x = 2, y = 3, z = 1;
+    double v, vx, vy, vz;
+    v = h(tau1, tau2, x, y, z, vx, vy, vz);
+    cout << v << " " << vx << " " << vy << " " << vz << "\n";
+  }
+  catch (const exception& e) {
+    cerr << "Caught exception: " << e.what() << "\n";
+    return 1;
+  }
+}