ADD: new track message, Entity class and Position class

libs/geographiclib/examples/example-LambertConformalConic.cpp

@@ -0,0 +1,48 @@
+// Example of using the GeographicLib::LambertConformalConic class
+
+#include <iostream>
+#include <exception>
+#include <GeographicLib/LambertConformalConic.hpp>
+
+using namespace std;
+using namespace GeographicLib;
+
+int main() {
+  try {
+    // Define the Pennsylvania South state coordinate system EPSG:3364
+    // https://www.spatialreference.org/ref/epsg/3364/
+    const double
+      a = Constants::WGS84_a(),
+      f = 1/298.257222101,                      // GRS80
+      lat1 = 40 + 58/60.0, lat2 = 39 + 56/60.0, // standard parallels
+      k1 = 1,                                   // scale
+      lat0 = 39 + 20/60.0, lon0 =-77 - 45/60.0, // origin
+      fe = 600000, fn = 0;                      // false easting and northing
+    // Set up basic projection
+    const LambertConformalConic PASouth(a, f, lat1, lat2, k1);
+    double x0, y0;
+    // Transform origin point
+    PASouth.Forward(lon0, lat0, lon0, x0, y0);
+    x0 -= fe; y0 -= fn;
+    {
+      // Sample conversion from geodetic to PASouth grid
+      double lat = 39.95, lon = -75.17;    // Philadelphia
+      double x, y;
+      PASouth.Forward(lon0, lat, lon, x, y);
+      x -= x0; y -= y0;
+      cout << x << " " << y << "\n";
+    }
+    {
+      // Sample conversion from PASouth grid to geodetic
+      double x = 820e3, y = 72e3;
+      double lat, lon;
+      x += x0; y += y0;
+      PASouth.Reverse(lon0, x, y, lat, lon);
+      cout << lat << " " << lon << "\n";
+    }
+  }
+  catch (const exception& e) {
+    cerr << "Caught exception: " << e.what() << "\n";
+    return 1;
+  }
+}