Organic Maps sources as of 02.04.2025 (fad26bbf22ac3da75e01e62aa01e5c8e11861005)

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geometry/distance_on_sphere.cpp

@@ -0,0 +1,29 @@
+#include "geometry/distance_on_sphere.hpp"
+
+#include "base/math.hpp"
+
+#include <algorithm>
+#include <cmath>
+
+namespace ms
+{
+double DistanceOnSphere(double lat1Deg, double lon1Deg, double lat2Deg, double lon2Deg)
+{
+  double const lat1 = base::DegToRad(lat1Deg);
+  double const lat2 = base::DegToRad(lat2Deg);
+  double const dlat = sin((lat2 - lat1) * 0.5);
+  double const dlon = sin((base::DegToRad(lon2Deg) - base::DegToRad(lon1Deg)) * 0.5);
+  double const y = dlat * dlat + dlon * dlon * cos(lat1) * cos(lat2);
+  return 2.0 * atan2(sqrt(y), sqrt(std::max(0.0, 1.0 - y)));
+}
+
+double DistanceOnEarth(double lat1Deg, double lon1Deg, double lat2Deg, double lon2Deg)
+{
+  return kEarthRadiusMeters * DistanceOnSphere(lat1Deg, lon1Deg, lat2Deg, lon2Deg);
+}
+
+double DistanceOnEarth(LatLon const & ll1, LatLon const & ll2)
+{
+  return DistanceOnEarth(ll1.m_lat, ll1.m_lon, ll2.m_lat, ll2.m_lon);
+}
+}  // namespace ms