[Qt] Added missing conversion helpers

3 files changed, 32 insertions, 0 deletions

diff --git a/platform/qt/include/qmapbox.hpp b/platform/qt/include/qmapbox.hpp
index b93187910b..f5fa9a3a68 100644
--- a/platform/qt/include/qmapbox.hpp
+++ b/platform/qt/include/qmapbox.hpp
@@ -15,6 +15,9 @@ namespace QMapbox {
 typedef QPair<double, double> Coordinate;
 typedef QPair<Coordinate, double> CoordinateZoom;
 
+// Reflects mbgl::ProjectedMeters<double>.
+typedef QPair<double, double> ProjectedMeters;
+
 // Reflects mbgl::{LineString,LinearRing,MultiPoint}<double>.
 typedef QList<Coordinate> Coordinates;
 
diff --git a/platform/qt/include/qmapboxgl.hpp b/platform/qt/include/qmapboxgl.hpp
index d5ec4b678f..f60ad8e677 100644
--- a/platform/qt/include/qmapboxgl.hpp
+++ b/platform/qt/include/qmapboxgl.hpp
@@ -198,6 +198,9 @@ public:
 
     void resize(const QSize &size, const QSize &framebufferSize);
 
+    double metersPerPixelAtLatitude(double latitude, double zoom) const;
+    QMapbox::ProjectedMeters projectedMetersForCoordinate(const QMapbox::Coordinate &) const;
+    QMapbox::Coordinate coordinateForProjectedMeters(const QMapbox::ProjectedMeters &) const;
     QPointF pixelForCoordinate(const QMapbox::Coordinate &) const;
     QMapbox::Coordinate coordinateForPixel(const QPointF &) const;
 
diff --git a/platform/qt/src/qmapboxgl.cpp b/platform/qt/src/qmapboxgl.cpp
index e94a0e1bc6..a1749ff456 100644
--- a/platform/qt/src/qmapboxgl.cpp
+++ b/platform/qt/src/qmapboxgl.cpp
@@ -1121,6 +1121,32 @@ void QMapboxGL::addAnnotationIcon(const QString &name, const QImage &icon)
 }
 
 /*!
+    Returns the amount of meters per pixel from a given \a latitude and \a zoom.
+*/
+double QMapboxGL::metersPerPixelAtLatitude(double latitude, double zoom) const
+{
+    return d_ptr->mapObj->getMetersPerPixelAtLatitude(latitude, zoom);
+}
+
+/*!
+    Return the projected meters for a given \a coordinate object.
+*/
+QMapbox::ProjectedMeters QMapboxGL::projectedMetersForCoordinate(const QMapbox::Coordinate &coordinate_) const
+{
+    auto projectedMeters = d_ptr->mapObj->projectedMetersForLatLng(mbgl::LatLng { coordinate_.first, coordinate_.second });
+    return QMapbox::ProjectedMeters(projectedMeters.northing, projectedMeters.easting);
+}
+
+/*!
+    Returns the coordinate for a given \a projectedMeters object.
+*/
+QMapbox::Coordinate QMapboxGL::coordinateForProjectedMeters(const QMapbox::ProjectedMeters &projectedMeters) const
+{
+    auto latLng = d_ptr->mapObj->latLngForProjectedMeters(mbgl::ProjectedMeters { projectedMeters.first, projectedMeters.second });
+    return QMapbox::Coordinate(latLng.latitude, latLng.longitude);
+}
+
+/*!
     \fn QMapboxGL::pixelForCoordinate(const QMapbox::Coordinate &coordinate) const
 
     Returns the offset in pixels for \a coordinate. The origin pixel coordinate is