73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
#include "testing/testing.hpp"
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#include "geometry/circle_on_earth.hpp"
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#include "geometry/distance_on_sphere.hpp"
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#include "geometry/mercator.hpp"
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#include "geometry/point2d.hpp"
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#include "base/math.hpp"
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#include <sstream>
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#include <vector>
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namespace
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{
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void TestGeometryAlmostEqualAbs(std::vector<m2::PointD> const & geometry, std::vector<m2::PointD> const & answer,
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double eps)
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{
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TEST_EQUAL(geometry.size(), answer.size(), ());
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for (size_t i = 0; i < geometry.size(); ++i)
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TEST_ALMOST_EQUAL_ABS(geometry[i], answer[i], eps, ());
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}
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void TestGeometryAlmostEqualMeters(std::vector<m2::PointD> const & geometry, std::vector<m2::PointD> const & answer,
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double epsMeters)
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{
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TEST_EQUAL(geometry.size(), answer.size(), ());
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for (size_t i = 0; i < geometry.size(); ++i)
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TEST_LESS(mercator::DistanceOnEarth(geometry[i], answer[i]), epsMeters, ());
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}
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} // namespace
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UNIT_TEST(CircleOnEarth)
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{
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ms::LatLon const center(90.0 /* lat */, 0.0 /* lon */);
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double const radiusMeters = 2.0 * math::pi * ms::kEarthRadiusMeters / 4.0;
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auto const geometry = ms::CreateCircleGeometryOnEarth(center, radiusMeters, 90.0 /* angleStepDegree */);
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std::vector<m2::PointD> const result = {mercator::FromLatLon(0.0, 0.0), mercator::FromLatLon(0.0, 90.0),
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mercator::FromLatLon(0.0, 180.0), mercator::FromLatLon(0.0, -90.0)};
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TestGeometryAlmostEqualAbs(geometry, result, 1e-9 /* eps */);
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}
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UNIT_TEST(CircleOnEarthEquator)
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{
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ms::LatLon const center(0.0 /* lat */, 0.0 /* lon */);
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auto const point = mercator::FromLatLon(center);
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auto constexpr kRadiusMeters = 10000.0;
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double const kRadiusMercator = mercator::MetersToMercator(kRadiusMeters);
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auto constexpr kAngleStepDegree = 30.0;
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auto constexpr kN = static_cast<size_t>(360.0 / kAngleStepDegree);
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std::vector<m2::PointD> result;
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result.reserve(kN);
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auto constexpr kStepRad = math::DegToRad(kAngleStepDegree);
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double angleSumRad = 0.0;
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double angleRad = -math::pi2;
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while (angleSumRad < 2 * math::pi)
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{
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angleSumRad += kStepRad;
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result.emplace_back(point.x + kRadiusMercator * cos(angleRad), point.y + kRadiusMercator * sin(angleRad));
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angleRad += kStepRad;
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if (angleRad > 2 * math::pi)
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angleRad -= 2 * math::pi;
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}
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auto const geometry = ms::CreateCircleGeometryOnEarth(center, kRadiusMeters, kAngleStepDegree);
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TestGeometryAlmostEqualMeters(geometry, result, 20.0 /* epsMeters */);
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}
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