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