Introduce Qt.labs.location QtLocationLabs singleton type

This singleton is meant to offer tech-preview map-related API.
It starts with a mapObjectsAt invokable, that can be used to probe
MapObjects at a specific coordinate of a map.
Reference implementation for Q*ObjectQSG, based on QGeoShape::contains,
included.

Change-Id: Ief692eb5a43115ca02d4642c82023d1b2e217400
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

2 files changed, 40 insertions, 0 deletions

diff --git a/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.cpp b/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.cpp
index f6520484..1ebad08d 100644
--- a/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.cpp
+++ b/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.cpp
@@ -65,6 +65,7 @@ public:
     virtual QList<QGeoMapObject *> mapObjects() const override;
     void removeMapObject(QGeoMapObject *obj);
     void updateMapObjects(QSGNode *root, QQuickWindow *window);
+    QList<QObject *>mapObjectsAt(const QGeoCoordinate &coordinate) const;
 
     QGeoMapObjectQSGSupport m_qsgSupport;
 #endif
@@ -137,6 +138,16 @@ void QGeoMapItemsOverlay::removeMapObject(QGeoMapObject *obj)
 #endif
 }
 
+QList<QObject *> QGeoMapItemsOverlay::mapObjectsAt(const QGeoCoordinate &coordinate) const
+{
+#ifdef LOCATIONLABS
+    Q_D(const QGeoMapItemsOverlay);
+    return d->mapObjectsAt(coordinate);
+#else
+    return QGeoMap::mapObjectsAt(coordinate);
+#endif
+}
+
 void QGeoMapItemsOverlayPrivate::setVisibleArea(const QRectF &visibleArea)
 {
     Q_Q(QGeoMapItemsOverlay);
@@ -185,6 +196,34 @@ void QGeoMapItemsOverlayPrivate::updateMapObjects(QSGNode *root, QQuickWindow *w
 {
     m_qsgSupport.updateMapObjects(root, window);
 }
+
+QList<QObject *> QGeoMapItemsOverlayPrivate::mapObjectsAt(const QGeoCoordinate &coordinate) const
+{
+    // ToDo: use a space partitioning strategy
+    QList<QObject *> res;
+    for (const auto o: mapObjects()) {
+        // explicitly handle lines
+        bool contains = false;
+        if (o->type() == QGeoMapObject::PolylineType ) {
+            QMapPolylineObject *mpo = static_cast<QMapPolylineObject *>(o);
+            qreal mpp = QLocationUtils::metersPerPixel(m_cameraData.zoomLevel(), coordinate);
+            QGeoPath path = o->geoShape();
+            path.setWidth(mpp * mpo->border()->width());
+            contains = path.contains(coordinate);
+        } else if (o->type() == QGeoMapObject::RouteType) {
+            qreal mpp = QLocationUtils::metersPerPixel(m_cameraData.zoomLevel(), coordinate);
+            QGeoPath path = o->geoShape();
+            path.setWidth(mpp * 4); // MapRouteObjectQSG has a hardcoded 4 pixels width;
+            contains = path.contains(coordinate);
+        } else {
+            contains = o->geoShape().contains(coordinate);
+        }
+
+        if (contains)
+            res.append(o);
+    }
+    return res;
+}
 #endif
 
 void QGeoMapItemsOverlayPrivate::updateObjectsGeometry()
diff --git a/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.h b/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.h
index 1594ffb3..c287345c 100644
--- a/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.h
+++ b/src/plugins/geoservices/itemsoverlay/qgeomapitemsoverlay.h
@@ -56,6 +56,7 @@ public:
     QGeoMap::Capabilities capabilities() const override;
     bool createMapObjectImplementation(QGeoMapObject *obj) override;
     void removeMapObject(QGeoMapObject *obj) override;
+    QList<QObject *> mapObjectsAt(const QGeoCoordinate &coordinate) const override;
 
 protected:
     QSGNode *updateSceneGraph(QSGNode *node, QQuickWindow *window) override;