Support touchscreen gestures (zoom/pan/rotate) in 3D viewer.

Though rotate doesn't work yet on MSW due to a wxWidgets bug.

3d-viewer/3d_canvas/eda_3d_canvas.cpp

@@ -73,6 +73,11 @@ BEGIN_EVENT_TABLE( EDA_3D_CANVAS, HIDPI_GL_3D_CANVAS )
     EVT_MOTION( EDA_3D_CANVAS::OnMouseMove )
     EVT_MAGNIFY( EDA_3D_CANVAS::OnMagnify )
 
+    // touch gesture events
+    EVT_GESTURE_ZOOM( wxID_ANY, EDA_3D_CANVAS::OnZoomGesture )
+    EVT_GESTURE_PAN( wxID_ANY, EDA_3D_CANVAS::OnPanGesture )
+    EVT_GESTURE_ROTATE( wxID_ANY, EDA_3D_CANVAS::OnRotateGesture )
+
     // other events
     EVT_ERASE_BACKGROUND( EDA_3D_CANVAS::OnEraseBackground )
     EVT_CUSTOM(wxEVT_REFRESH_CUSTOM_COMMAND, ID_CUSTOM_EVENT_1, EDA_3D_CANVAS::OnRefreshRequest )
@@ -144,6 +149,8 @@ EDA_3D_CANVAS::EDA_3D_CANVAS( wxWindow* aParent, const wxGLAttributes& aGLAttrib
     wxASSERT( a3DCachePointer != nullptr );
     m_boardAdapter.Set3dCacheManager( a3DCachePointer );
 
+    EnableTouchEvents( wxTOUCH_ZOOM_GESTURE | wxTOUCH_PAN_GESTURES | wxTOUCH_ROTATE_GESTURE );
+
     const wxEventType events[] =
     {
         // Binding both EVT_CHAR and EVT_CHAR_HOOK ensures that all key events,
@@ -631,6 +638,75 @@ void EDA_3D_CANVAS::OnMagnify( wxMouseEvent& event )
 }
 
 
+void EDA_3D_CANVAS::OnZoomGesture( wxZoomGestureEvent& aEvent )
+{
+    SetFocus();
+
+    if( aEvent.IsGestureStart() )
+    {
+        m_gestureLastZoomFactor = 1.0;
+        m_camera.SetCurMousePosition( aEvent.GetPosition() );
+    }
+
+    if( m_camera_is_moving )
+        return;
+
+    restart_editingTimeOut_Timer();
+
+    m_camera.Pan( aEvent.GetPosition() );
+    m_camera.SetCurMousePosition( aEvent.GetPosition() );
+
+    m_camera.Zoom( aEvent.GetZoomFactor() / m_gestureLastZoomFactor );
+
+    m_gestureLastZoomFactor = aEvent.GetZoomFactor();
+
+    DisplayStatus();
+    Request_refresh();
+}
+
+
+void EDA_3D_CANVAS::OnPanGesture( wxPanGestureEvent& aEvent )
+{
+    SetFocus();
+
+    if( aEvent.IsGestureStart() )
+        m_camera.SetCurMousePosition( aEvent.GetPosition() );
+
+    if( m_camera_is_moving )
+        return;
+
+    m_camera.Pan( aEvent.GetPosition() );
+    m_camera.SetCurMousePosition( aEvent.GetPosition() );
+
+    DisplayStatus();
+    Request_refresh();
+}
+
+
+void EDA_3D_CANVAS::OnRotateGesture( wxRotateGestureEvent& aEvent )
+{
+    SetFocus();
+
+    if( aEvent.IsGestureStart() )
+    {
+        m_gestureLastAngle = 0;
+        m_camera.SetCurMousePosition( aEvent.GetPosition() );
+
+        // We don't want to process the first angle
+        return;
+    }
+
+    if( m_camera_is_moving )
+        return;
+
+    m_camera.RotateScreen( m_gestureLastAngle - aEvent.GetRotationAngle() );
+    m_gestureLastAngle = aEvent.GetRotationAngle();
+
+    DisplayStatus();
+    Request_refresh();
+}
+
+
 void EDA_3D_CANVAS::OnMouseMove( wxMouseEvent& event )
 {
     if( m_3d_render && m_3d_render->IsReloadRequestPending() )

3d-viewer/3d_canvas/eda_3d_canvas.h

@@ -237,6 +237,10 @@ private:
     void OnResize( wxSizeEvent& event );
     void OnTimerTimeout_Redraw( wxTimerEvent& event );
 
+    void OnZoomGesture( wxZoomGestureEvent& event );
+    void OnPanGesture( wxPanGestureEvent& event );
+    void OnRotateGesture( wxRotateGestureEvent& event );
+
     DECLARE_EVENT_TABLE()
 
     /**
@@ -324,6 +328,10 @@ private:
     bool    m_render3dmousePivot = false; // Render the 3dmouse pivot
     SFVEC3F m_3dmousePivotPos;            // The position of the 3dmouse pivot
 
+    ///< Used to track gesture events.
+    double   m_gestureLastZoomFactor = 1.0;
+    double   m_gestureLastAngle = 0.0;
+
     /**
      *  Trace mask used to enable or disable the trace output of this class.
      *  The debug output can be turned on by setting the WXTRACE environment variable to

common/gal/3d/camera.cpp

@@ -647,6 +647,14 @@ bool CAMERA::Zoom_T1( float aFactor )
 }
 
 
+void CAMERA::RotateScreen( float aAngleInRadians )
+{
+    glm::mat4 matrix = GetRotationMatrix();
+    SetRotationMatrix( glm::rotate( matrix, aAngleInRadians, GetDir() ) );
+    updateRotationMatrix();
+}
+
+
 void CAMERA::RotateX( float aAngleInRadians )
 {
     m_rotate_aux.x += aAngleInRadians;

include/gal/3d/camera.h

@@ -236,6 +236,11 @@ public:
 
     bool ViewCommand_T1( VIEW3D_TYPE aRequestedView );
 
+    /**
+     * Rotates the camera in screen plane.
+     */
+    void RotateScreen( float aAngleInRadians );
+
     void RotateX( float aAngleInRadians );
     void RotateY( float aAngleInRadians );
     void RotateZ( float aAngleInRadians );