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#include <mbgl/test/util.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/geo.hpp>
#include <mbgl/util/projection.hpp>
#include <limits>
using namespace mbgl;
TEST(Projection, MetersPerPixelAtLatitude) {
double zoom = 0;
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom), 78271.516964020484);
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(-util::LATITUDE_MAX, zoom), 6752.2284729446501);
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(util::LATITUDE_MAX, zoom),
Projection::getMetersPerPixelAtLatitude(-util::LATITUDE_MAX, zoom));
zoom = 20;
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom), 0.074645535434742435);
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(-util::LATITUDE_MAX, zoom), 0.0064394268731543065);
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(std::numeric_limits<double>::lowest(), zoom),
Projection::getMetersPerPixelAtLatitude(std::numeric_limits<double>::max(), zoom));
zoom = std::numeric_limits<double>::min();
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom),
Projection::getMetersPerPixelAtLatitude(0, util::MIN_ZOOM));
zoom = std::numeric_limits<double>::lowest();
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom),
Projection::getMetersPerPixelAtLatitude(0, util::MIN_ZOOM));
zoom = std::numeric_limits<double>::max();
EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom),
Projection::getMetersPerPixelAtLatitude(0, util::MAX_ZOOM));
}
TEST(Projection, ProjectedMeters) {
auto latLng = LatLng {};
auto projectedMeters = Projection::projectedMetersForLatLng(latLng);
EXPECT_EQ(projectedMeters.northing, projectedMeters.easting);
EXPECT_EQ(latLng, Projection::latLngForProjectedMeters(projectedMeters));
const auto southWest = LatLng { -util::LATITUDE_MAX, -util::LONGITUDE_MAX };
projectedMeters = Projection::projectedMetersForLatLng(southWest);
EXPECT_DOUBLE_EQ(projectedMeters.northing, -20037508.342789274);
EXPECT_DOUBLE_EQ(projectedMeters.easting, -20037508.342789244);
const auto northEast = LatLng { util::LATITUDE_MAX, util::LONGITUDE_MAX };
projectedMeters = Projection::projectedMetersForLatLng(northEast);
EXPECT_DOUBLE_EQ(projectedMeters.northing, 20037508.342789274);
EXPECT_DOUBLE_EQ(projectedMeters.easting, 20037508.342789244);
projectedMeters = ProjectedMeters { std::numeric_limits<double>::lowest(), std::numeric_limits<double>::lowest() };
latLng = Projection::latLngForProjectedMeters(projectedMeters);
EXPECT_EQ(latLng.latitude(), -util::LATITUDE_MAX);
EXPECT_EQ(latLng.longitude(), -util::LONGITUDE_MAX);
projectedMeters = ProjectedMeters { std::numeric_limits<double>::max(), std::numeric_limits<double>::max() };
latLng = Projection::latLngForProjectedMeters(projectedMeters);
EXPECT_EQ(latLng.latitude(), util::LATITUDE_MAX);
EXPECT_EQ(latLng.longitude(), util::LONGITUDE_MAX);
}
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