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transform.cpp
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transform.cpp
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#include "../fixtures/util.hpp"
#include "../fixtures/mock_view.hpp"
#include <mbgl/map/transform.hpp>
#include <mbgl/util/geo.hpp>
using namespace mbgl;
TEST(Transform, InvalidScale) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(1, transform.getScale());
transform.setScale(2 << 0);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
const double invalid = std::nan("");
transform.setScale(invalid);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
transform.scaleBy(invalid);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
transform.setZoom(invalid);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
transform.setLatLngZoom({ 0, 0 }, invalid);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
}
TEST(Transform, InvalidLatLng) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(1, transform.getScale());
transform.setScale(2 << 0);
transform.setLatLng({ 8, 10 });
ASSERT_DOUBLE_EQ(8, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(10, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
transform.setLatLngZoom({ 10, 8 }, 2);
ASSERT_DOUBLE_EQ(10, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(8, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(4, transform.getScale());
const double invalid = std::nan("");
transform.setLatLngZoom({ invalid, 8 }, 2);
ASSERT_DOUBLE_EQ(10, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(8, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(4, transform.getScale());
transform.setLatLngZoom({ 10, invalid }, 2);
ASSERT_DOUBLE_EQ(10, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(8, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(4, transform.getScale());
}
TEST(Transform, InvalidBearing) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(1, transform.getScale());
transform.setScale(2 << 0);
transform.setAngle(2);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
ASSERT_DOUBLE_EQ(2, transform.getAngle());
const double invalid = std::nan("");
transform.setAngle(invalid);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(2, transform.getScale());
ASSERT_DOUBLE_EQ(2, transform.getAngle());
}
TEST(Transform, PerspectiveProjection) {
MockView view;
LatLng loc;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
transform.setScale(2 << 9);
transform.setPitch(0.9);
transform.setLatLng(LatLng(38, -77));
// expected values are from mapbox-gl-js
loc = transform.getLatLng();
ASSERT_NEAR(-77, loc.longitude, 0.0001);
ASSERT_NEAR(38, loc.latitude, 0.0001);
loc = transform.getState().screenCoordinateToLatLng({ 0, 1000 });
ASSERT_NEAR(-77.59198961199148, loc.longitude, 0.0002);
ASSERT_NEAR(38.74661326302018, loc.latitude, 0.0001);
loc = transform.getState().screenCoordinateToLatLng({ 1000, 0 });
ASSERT_NEAR(-76.75823239205641, loc.longitude, 0.0001);
ASSERT_NEAR(37.692872969426375, loc.latitude, 0.0001);
ScreenCoordinate point = transform.getState().latLngToScreenCoordinate({38.74661326302018, -77.59198961199148});
ASSERT_NEAR(point.x, 0, 0.01);
ASSERT_NEAR(point.y, 1000, 0.01);
point = transform.getState().latLngToScreenCoordinate({37.692872969426375, -76.75823239205641});
ASSERT_NEAR(point.x, 1000, 0.02);
ASSERT_NEAR(point.y, 0, 0.02);
}
TEST(Transform, UnwrappedLatLng) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
transform.setScale(2 << 9);
transform.setPitch(0.9);
transform.setLatLng(LatLng(38, -77));
const TransformState& state = transform.getState();
LatLng fromGetLatLng = state.getLatLng();
ASSERT_DOUBLE_EQ(fromGetLatLng.latitude, 38);
ASSERT_DOUBLE_EQ(fromGetLatLng.longitude, -77);
LatLng fromScreenCoordinate = state.screenCoordinateToLatLng({ 500, 500 });
ASSERT_NEAR(fromScreenCoordinate.latitude, 37.999999999999829, 0.0001); // 1.71E-13
ASSERT_NEAR(fromScreenCoordinate.longitude, -76.999999999999773, 0.0001); // 2.27E-13
LatLng wrappedForwards = state.screenCoordinateToLatLng(state.latLngToScreenCoordinate({ 38, 283 }));
ASSERT_NEAR(wrappedForwards.latitude, 37.999999999999716, 0.0001); // 2.84E-13
ASSERT_NEAR(wrappedForwards.longitude, 282.99999999988751, 0.0001); // 1.1249E-11
wrappedForwards.wrap();
ASSERT_NEAR(wrappedForwards.longitude, -77.000000000112493, 0.001); // 1.1249E-11
LatLng wrappedBackwards = state.screenCoordinateToLatLng(state.latLngToScreenCoordinate({ 38, -437 }));
ASSERT_NEAR(wrappedBackwards.latitude, wrappedForwards.latitude, 0.001);
ASSERT_NEAR(wrappedBackwards.longitude, -436.99999999988728, 0.001); // 1.1272E-11
wrappedBackwards.wrap();
ASSERT_NEAR(wrappedBackwards.longitude, -76.99999999988728, 0.001); // 1.1272E-11
}
TEST(Transform, ConstrainHeightOnly) {
MockView view;
LatLng loc;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
transform.setScale(std::pow(2, util::MAX_ZOOM));
transform.setLatLng(LatLngBounds::world().southwest());
loc = transform.getLatLng();
ASSERT_NEAR(-util::LATITUDE_MAX, loc.latitude, 0.001);
ASSERT_NEAR(util::LONGITUDE_MAX, std::abs(loc.longitude), 0.001);
transform.setLatLng(LatLngBounds::world().northeast());
loc = transform.getLatLng();
ASSERT_NEAR(util::LATITUDE_MAX, loc.latitude, 0.001);
ASSERT_NEAR(util::LONGITUDE_MAX, std::abs(loc.longitude), 0.001);
}
TEST(Transform, ConstrainWidthAndHeight) {
MockView view;
LatLng loc;
Transform transform(view, ConstrainMode::WidthAndHeight);
transform.resize({{ 1000, 1000 }});
transform.setScale(std::pow(2, util::MAX_ZOOM));
transform.setLatLng(LatLngBounds::world().southwest());
loc = transform.getLatLng();
ASSERT_NEAR(-util::LATITUDE_MAX, loc.latitude, 0.001);
ASSERT_NEAR(-util::LONGITUDE_MAX, loc.longitude, 0.001);
transform.setLatLng(LatLngBounds::world().northeast());
loc = transform.getLatLng();
ASSERT_NEAR(util::LATITUDE_MAX, loc.latitude, 0.001);
ASSERT_NEAR(util::LONGITUDE_MAX, std::abs(loc.longitude), 0.001);
}
TEST(Transform, Anchor) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
const LatLng latLng { 10, -100 };
transform.setLatLngZoom(latLng, 10);
ASSERT_DOUBLE_EQ(latLng.latitude, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(latLng.longitude, transform.getLatLng().longitude);
ASSERT_DOUBLE_EQ(10, transform.getZoom());
ASSERT_DOUBLE_EQ(0, transform.getAngle());
transform.setAngle(M_PI_4);
ASSERT_NEAR(M_PI_4, transform.getAngle(), 0.000001);
ASSERT_DOUBLE_EQ(latLng.latitude, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(latLng.longitude, transform.getLatLng().longitude);
const ScreenCoordinate anchorPoint = { 150, 150 };
const LatLng anchorLatLng = transform.getState().screenCoordinateToLatLng(anchorPoint);
transform.setAngle(-45 * util::DEG2RAD, anchorPoint);
ASSERT_NEAR(-45 / util::RAD2DEG, transform.getAngle(), 0.000001);
ASSERT_NE(latLng.latitude, transform.getLatLng().latitude);
ASSERT_NE(latLng.longitude, transform.getLatLng().longitude);
ASSERT_NEAR(anchorLatLng.latitude, transform.getLatLng().latitude, 1);
ASSERT_NEAR(anchorLatLng.longitude, transform.getLatLng().longitude, 1);
}
TEST(Transform, Padding) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
ASSERT_DOUBLE_EQ(0, transform.getLatLng().latitude);
ASSERT_DOUBLE_EQ(0, transform.getLatLng().longitude);
transform.setLatLngZoom({ 10, -100 }, 10);
const LatLng trueCenter = transform.getLatLng();
ASSERT_DOUBLE_EQ(10, trueCenter.latitude);
ASSERT_DOUBLE_EQ(-100, trueCenter.longitude);
ASSERT_DOUBLE_EQ(10, transform.getZoom());
const LatLng manualShiftedCenter = transform.getState().screenCoordinateToLatLng({
1000.0 / 2.0,
1000.0 / 4.0,
});
EdgeInsets padding;
padding.top = 0;
ASSERT_FALSE(bool(padding));
padding.top = NAN;
ASSERT_FALSE(bool(padding));
padding.top = 1000.0 / 2.0;
ASSERT_TRUE(bool(padding));
const LatLng shiftedCenter = transform.getLatLng(padding);
ASSERT_NE(trueCenter.latitude, shiftedCenter.latitude);
ASSERT_DOUBLE_EQ(trueCenter.longitude, shiftedCenter.longitude);
ASSERT_DOUBLE_EQ(manualShiftedCenter.latitude, shiftedCenter.latitude);
ASSERT_DOUBLE_EQ(manualShiftedCenter.longitude, shiftedCenter.longitude);
}
TEST(Transform, MoveBy) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
transform.setLatLngZoom({ 0, 0 }, 10);
LatLng trueCenter = transform.getLatLng();
ASSERT_DOUBLE_EQ(0, trueCenter.latitude);
ASSERT_DOUBLE_EQ(0, trueCenter.longitude);
ASSERT_DOUBLE_EQ(10, transform.getZoom());
for (uint8_t x = 0; x < 20; ++x) {
bool odd = x % 2;
bool forward = x % 10;
LatLng coordinate = transform.screenCoordinateToLatLng({ odd ? 400. : 600., forward ? 400. : 600 });
transform.moveBy({ odd ? 100. : -100., forward ? 100. : -100 });
trueCenter = transform.getLatLng();
ASSERT_NEAR(coordinate.latitude, trueCenter.latitude, 0.0001);
ASSERT_NEAR(coordinate.longitude, trueCenter.longitude, 0.0001);
}
// We have ~1.1 precision loss for each coordinate for 20 rounds of moveBy.
ASSERT_NEAR(0, trueCenter.latitude, 1.1);
ASSERT_NEAR(0, trueCenter.longitude, 1.1);
}
TEST(Transform, Antimeridian) {
MockView view;
Transform transform(view, ConstrainMode::HeightOnly);
transform.resize({{ 1000, 1000 }});
transform.setLatLngZoom({ 0, 0 }, 1);
const LatLng coordinateSanFrancisco { 37.7833, -122.4167 };
ScreenCoordinate pixelSF = transform.latLngToScreenCoordinate(coordinateSanFrancisco);
ASSERT_DOUBLE_EQ(151.79409149185352, pixelSF.x);
ASSERT_DOUBLE_EQ(383.76774094913071, pixelSF.y);
transform.setLatLng({ 0, -181 });
ScreenCoordinate pixelSFBackwards = transform.latLngToScreenCoordinate(coordinateSanFrancisco);
ASSERT_DOUBLE_EQ(666.63617954008976, pixelSFBackwards.x);
ASSERT_DOUBLE_EQ(pixelSF.y, pixelSFBackwards.y);
transform.setLatLng({ 0, 179 });
ScreenCoordinate pixelSFForwards = transform.latLngToScreenCoordinate(coordinateSanFrancisco);
ASSERT_DOUBLE_EQ(pixelSFBackwards.x, pixelSFForwards.x);
ASSERT_DOUBLE_EQ(pixelSFBackwards.y, pixelSFForwards.y);
const LatLng coordinateWaikiri{ -16.9310, 179.9787 };
transform.setLatLngZoom(coordinateWaikiri, 10);
ScreenCoordinate pixelWaikiri = transform.latLngToScreenCoordinate(coordinateWaikiri);
ASSERT_DOUBLE_EQ(500.00000000007759, pixelWaikiri.x);
ASSERT_DOUBLE_EQ(500, pixelWaikiri.y);
transform.setLatLng({ coordinateWaikiri.latitude, 180.0213 });
ScreenCoordinate pixelWaikiriForwards = transform.latLngToScreenCoordinate(coordinateWaikiri);
ASSERT_DOUBLE_EQ(437.95953728819512, pixelWaikiriForwards.x);
ASSERT_DOUBLE_EQ(pixelWaikiri.y, pixelWaikiriForwards.y);
transform.setLatLng({ coordinateWaikiri.latitude, -179.9787 });
ScreenCoordinate pixelWaikiriBackwards = transform.latLngToScreenCoordinate(coordinateWaikiri);
ASSERT_DOUBLE_EQ(pixelWaikiriForwards.x, pixelWaikiriBackwards.x);
ASSERT_DOUBLE_EQ(pixelWaikiriForwards.y, pixelWaikiriBackwards.y);
}