Add setBearing overload to rotate around a coordinate

This patch adds an overload for setBearing in QDeclarativeGeoMap to
rotate the map around a specific QGeoCoordinate.

[ChangeLog][QtLocation][QDeclarativeGeoMap] Added setBearing overload to
rotate the map around a given QGeoCoordinate.

Change-Id: I5d2428d852b0c3537f4a1cdb1925c059788c45c5
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

2 files changed, 29 insertions, 0 deletions

diff --git a/src/location/declarativemaps/qdeclarativegeomap.cpp b/src/location/declarativemaps/qdeclarativegeomap.cpp
index cb991341..47283d85 100644
--- a/src/location/declarativemaps/qdeclarativegeomap.cpp
+++ b/src/location/declarativemaps/qdeclarativegeomap.cpp
@@ -1460,6 +1460,33 @@ QQmlListProperty<QDeclarativeGeoMapType> QDeclarativeGeoMap::supportedMapTypes()
 }
 
 /*!
+    \qmlmethod void QtLocation::Map::setBearing(real bearing, coordinate coordinate)
+
+    Sets the bearing for the map to \a bearing, rotating it around \a coordinate.
+    If the Plugin used for the Map supports bearing, the valid range for \a bearing is between 0 and 360.
+    If the Plugin used for the Map does not support bearing, or if the map is tilted and \a coordinate happens
+    to be behind the camera, or if the map is not ready (see \l mapReady), calling this method will have no effect.
+
+    \since 5.10
+*/
+void QDeclarativeGeoMap::setBearing(qreal bearing, const QGeoCoordinate &coordinate)
+{
+    if (!m_map)
+        return;
+
+    const QDoubleVector2D coordWrapped = m_map->geoProjection().geoToWrappedMapProjection(coordinate);
+    if (!m_map->geoProjection().isProjectable(coordWrapped))
+        return;
+
+    const QPointF rotationPoint = m_map->geoProjection().wrappedMapProjectionToItemPosition(coordWrapped).toPointF();
+
+    // First set bearing
+    setBearing(bearing);
+    // then reanchor
+    setCenter(m_map->geoProjection().anchorCoordinateToPoint(coordinate, rotationPoint));
+}
+
+/*!
     \qmlmethod coordinate QtLocation::Map::toCoordinate(QPointF position, bool clipToViewPort)
 
     Returns the coordinate which corresponds to the \a position relative to the map item.
diff --git a/src/location/declarativemaps/qdeclarativegeomap_p.h b/src/location/declarativemaps/qdeclarativegeomap_p.h
index f07a2e7f..2f20e3ae 100644
--- a/src/location/declarativemaps/qdeclarativegeomap_p.h
+++ b/src/location/declarativemaps/qdeclarativegeomap_p.h
@@ -155,6 +155,8 @@ public:
 
     QQmlListProperty<QDeclarativeGeoMapType> supportedMapTypes();
 
+    Q_INVOKABLE void setBearing(qreal bearing, const QGeoCoordinate &coordinate);
+
     Q_INVOKABLE void removeMapItem(QDeclarativeGeoMapItemBase *item);
     Q_INVOKABLE void addMapItem(QDeclarativeGeoMapItemBase *item);