Organic Maps sources as of 02.04.2025 (fad26bbf22ac3da75e01e62aa01e5c8e11861005)

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generator/routing_city_boundaries_processor.cpp

@@ -0,0 +1,36 @@
+#include "generator/routing_city_boundaries_processor.hpp"
+
+#include "geometry/distance_on_sphere.hpp"
+#include "geometry/mercator.hpp"
+
+#include "std/boost_geometry.hpp"
+#include <boost/geometry/geometries/point_xy.hpp>
+#include <boost/geometry/geometries/polygon.hpp>
+
+namespace generator
+{
+
+double AreaOnEarth(std::vector<m2::PointD> const & points)
+{
+  namespace bg = boost::geometry;
+  using LonLatCoords = bg::cs::spherical_equatorial<bg::degree>;
+  bg::model::ring<bg::model::point<double, 2, LonLatCoords>> sphericalPolygon;
+
+  auto const addPoint = [&sphericalPolygon](auto const & point) {
+    auto const latlon = mercator::ToLatLon(point);
+    sphericalPolygon.emplace_back(latlon.m_lon, latlon.m_lat);
+  };
+
+  sphericalPolygon.reserve(points.size());
+  for (auto point : points)
+    addPoint(point);
+
+  addPoint(points.front());
+
+  bg::strategy::area::spherical<> areaCalculationStrategy(ms::kEarthRadiusMeters);
+
+  double const area = bg::area(sphericalPolygon, areaCalculationStrategy);
+  return fabs(area);
+}
+
+}  // namespace generator