121 lines
5.1 KiB
C++
121 lines
5.1 KiB
C++
#include <mbgl/test/util.hpp>
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#include <mbgl/util/constants.hpp>
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#include <mbgl/util/projection.hpp>
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#include <limits>
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using namespace mbgl;
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TEST(Projection, Boundaries) {
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LatLng sw { -90.0, -180.0 };
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LatLng ne { 90.0, 180.0 };
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const double minScale = std::pow(2, 0);
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const double maxScale = std::pow(2, util::DEFAULT_MAX_ZOOM);
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Point<double> projected {};
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LatLng unprojected {};
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projected = Projection::project(sw, minScale);
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EXPECT_DOUBLE_EQ(projected.x, 0.0);
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EXPECT_DOUBLE_EQ(projected.y, util::tileSize);
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unprojected = Projection::unproject(projected, minScale);
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EXPECT_DOUBLE_EQ(unprojected.latitude(), -util::LATITUDE_MAX);
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EXPECT_DOUBLE_EQ(unprojected.longitude(), sw.longitude());
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projected = Projection::project(sw, maxScale);
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EXPECT_DOUBLE_EQ(projected.x, 0.0);
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EXPECT_DOUBLE_EQ(projected.y, util::tileSize * maxScale);
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unprojected = Projection::unproject(projected, maxScale);
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EXPECT_DOUBLE_EQ(unprojected.latitude(), -util::LATITUDE_MAX);
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EXPECT_DOUBLE_EQ(unprojected.longitude(), sw.longitude());
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projected = Projection::project(ne, minScale);
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EXPECT_DOUBLE_EQ(projected.x, util::tileSize);
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ASSERT_NEAR(projected.y, 0.0, 1e-10);
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unprojected = Projection::unproject(projected, minScale);
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EXPECT_DOUBLE_EQ(unprojected.latitude(), util::LATITUDE_MAX);
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EXPECT_DOUBLE_EQ(unprojected.longitude(), ne.longitude());
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projected = Projection::project(ne, maxScale);
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EXPECT_DOUBLE_EQ(projected.x, util::tileSize * maxScale);
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ASSERT_NEAR(projected.y, 0.0, 1e-6);
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unprojected = Projection::unproject(projected, maxScale);
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EXPECT_DOUBLE_EQ(unprojected.latitude(), util::LATITUDE_MAX);
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EXPECT_DOUBLE_EQ(unprojected.longitude(), ne.longitude());
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}
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TEST(Projection, MetersPerPixelAtLatitude) {
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double zoom = 0;
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom), 78271.516964020484);
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(-util::LATITUDE_MAX, zoom), 6752.2284729446501);
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(util::LATITUDE_MAX, zoom),
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Projection::getMetersPerPixelAtLatitude(-util::LATITUDE_MAX, zoom));
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zoom = 20;
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom), 0.074645535434742435);
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(-util::LATITUDE_MAX, zoom), 0.0064394268731543065);
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(std::numeric_limits<double>::lowest(), zoom),
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Projection::getMetersPerPixelAtLatitude(std::numeric_limits<double>::max(), zoom));
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zoom = std::numeric_limits<double>::min();
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom),
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Projection::getMetersPerPixelAtLatitude(0, util::MIN_ZOOM));
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zoom = std::numeric_limits<double>::lowest();
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom),
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Projection::getMetersPerPixelAtLatitude(0, util::MIN_ZOOM));
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zoom = std::numeric_limits<double>::max();
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EXPECT_DOUBLE_EQ(Projection::getMetersPerPixelAtLatitude(0, zoom),
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Projection::getMetersPerPixelAtLatitude(0, util::MAX_ZOOM));
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}
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TEST(Projection, ProjectedMeters) {
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auto latLng = LatLng {};
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auto projectedMeters = Projection::projectedMetersForLatLng(latLng);
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EXPECT_EQ(projectedMeters.northing(), projectedMeters.easting());
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EXPECT_EQ(latLng, Projection::latLngForProjectedMeters(projectedMeters));
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const auto southWest = LatLng { -util::LATITUDE_MAX, -util::LONGITUDE_MAX };
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projectedMeters = Projection::projectedMetersForLatLng(southWest);
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EXPECT_DOUBLE_EQ(projectedMeters.northing(), -20037508.342789274);
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EXPECT_DOUBLE_EQ(projectedMeters.easting(), -20037508.342789244);
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const auto northEast = LatLng { util::LATITUDE_MAX, util::LONGITUDE_MAX };
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projectedMeters = Projection::projectedMetersForLatLng(northEast);
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EXPECT_DOUBLE_EQ(projectedMeters.northing(), 20037508.342789274);
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EXPECT_DOUBLE_EQ(projectedMeters.easting(), 20037508.342789244);
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projectedMeters = ProjectedMeters { std::numeric_limits<double>::lowest(), std::numeric_limits<double>::lowest() };
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latLng = Projection::latLngForProjectedMeters(projectedMeters);
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EXPECT_EQ(latLng.latitude(), -util::LATITUDE_MAX);
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EXPECT_EQ(latLng.longitude(), -util::LONGITUDE_MAX);
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projectedMeters = ProjectedMeters { std::numeric_limits<double>::max(), std::numeric_limits<double>::max() };
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latLng = Projection::latLngForProjectedMeters(projectedMeters);
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EXPECT_EQ(latLng.latitude(), util::LATITUDE_MAX);
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EXPECT_EQ(latLng.longitude(), util::LONGITUDE_MAX);
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}
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TEST(Projection, InvalidProjectedMeters) {
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try {
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ProjectedMeters { NAN };
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ASSERT_TRUE(false) << "should throw";
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} catch (const std::domain_error& error) {
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ASSERT_EQ(std::string(error.what()), "northing must not be NaN");
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}
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try {
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ProjectedMeters { 0, NAN };
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ASSERT_TRUE(false) << "should throw";
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} catch (const std::domain_error& error) {
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ASSERT_EQ(std::string(error.what()), "easting must not be NaN");
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}
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}
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