[Qt] Implement bearing on the QML Mapbox Map type

platform/qt/include/qquickmapboxgl.hpp

@@ -29,6 +29,7 @@ class Q_DECL_EXPORT QQuickMapboxGL : public QQuickFramebufferObject
 
     // MapboxGL QML Type interface.
     Q_PROPERTY(QString style READ style WRITE setStyle NOTIFY styleChanged)
+    Q_PROPERTY(qreal bearing READ bearing WRITE setBearing NOTIFY bearingChanged)
 
 public:
     QQuickMapboxGL(QQuickItem *parent = 0);
@@ -71,6 +72,9 @@ public:
     void setStyle(const QString &style);
     QString style() const;
 
+    void setBearing(qreal bearing);
+    qreal bearing() const;
+
     QPointF swapPan();
 
     enum SyncState {
@@ -79,6 +83,7 @@ public:
         CenterNeedsSync  = 0x02,
         StyleNeedsSync   = 0x04,
         PanNeedsSync     = 0x08,
+        BearingNeedsSync = 0x16,
     };
 
     int swapSyncState();
@@ -97,6 +102,7 @@ signals:
     void colorChanged(const QColor &color);
 
     void styleChanged();
+    void bearingChanged(qreal angle);
 
 private:
     qreal m_minimumZoomLevel = 0;
@@ -109,6 +115,7 @@ private:
     QGeoShape m_visibleRegion;
 
     QString m_style;
+    qreal m_bearing = 0;
 
     int m_syncState = NothingNeedsSync;
 };

platform/qt/src/qquickmapboxgl.cpp

@@ -6,6 +6,8 @@
 #include <QString>
 #include <QtGlobal>
 
+#include <cmath>
+
 QQuickMapboxGL::QQuickMapboxGL(QQuickItem *parent_)
     : QQuickFramebufferObject(parent_)
 {
@@ -186,6 +188,27 @@ QString QQuickMapboxGL::style() const
     return m_style;
 }
 
+void QQuickMapboxGL::setBearing(qreal angle)
+{
+    angle = std::fmod(angle, 360.);
+
+    if (m_bearing == angle) {
+        return;
+    }
+
+    m_bearing = angle;
+
+    m_syncState |= BearingNeedsSync;
+    update();
+
+    emit bearingChanged(m_bearing);
+}
+
+qreal QQuickMapboxGL::bearing() const
+{
+    return m_bearing;
+}
+
 QPointF QQuickMapboxGL::swapPan()
 {
     QPointF oldPan = m_pan;

platform/qt/src/qquickmapboxglrenderer.cpp

@@ -65,4 +65,8 @@ void QQuickMapboxGLRenderer::synchronize(QQuickFramebufferObject *item)
     if (syncStatus & QQuickMapboxGL::PanNeedsSync) {
         m_map->moveBy(quickMap->swapPan());
     }
+
+    if (syncStatus & QQuickMapboxGL::BearingNeedsSync) {
+        m_map->setBearing(quickMap->bearing());
+    }
 }