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[core] Fix screen coordinates when crossing the antimeridian

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If the center and point coordinates are not in the same side of the
antimeridian, we need to unwrap the point longitude to make sure
it can still be seen from the visible side of the antimeridian that is
opposite to the center side.

Fixes #4155.
This commit is contained in:
Bruno de Oliveira Abinader
2016-03-10 03:24:47 +02:00
parent 7dde622db1
commit 1a4b8f3e2f
3 changed files with 38 additions and 1 deletions
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16
src/mbgl/map/transform.cpp
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@@ -660,7 +660,21 @@ void Transform::setGestureInProgress(bool inProgress) {
ScreenCoordinate Transform::latLngToScreenCoordinate(const LatLng& latLng) const {
if (!latLng) return {};
ScreenCoordinate point = state.latLngToScreenCoordinate(latLng);
// If the center and point coordinates are not in the same side of the
// antimeridian, we need to unwrap the point longitude to make sure it can
// still be seen from the visible side of the antimeridian that is opposite
// to the center side.
double longitude = latLng.longitude;
const double centerLng = getLatLng().longitude;
if (centerLng - latLng.longitude > util::LONGITUDE_MAX) {
if (centerLng > 0 && latLng.longitude < 0) {
longitude += util::DEGREES_MAX;
} else if (centerLng < 0 && latLng.longitude > 0) {
longitude -= util::DEGREES_MAX;
}
}
ScreenCoordinate point = state.latLngToScreenCoordinate({ latLng.latitude, longitude });
point.y = state.height - point.y;
return point;
}