vtk camera position widget on viewer

src/Vtk/uLibVtkViewer.h

@@ -33,12 +33,14 @@
 #include <vtkOrientationMarkerWidget.h>
 #include <vtkRenderWindow.h>
 #include <vtkRenderer.h>
+#include <vtkSmartPointer.h>
 
 class vtkProp;
 class vtk3DWidget;
 class vtkCornerAnnotation;
 class vtkRenderWindowInteractor;
 class vtkRenderer;
+class vtkCameraOrientationWidget;
 
 namespace uLib {
 namespace Vtk {
@@ -62,6 +64,10 @@ public:
 
   void AddWidget(vtk3DWidget *widget);
 
+  static vtkSmartPointer<vtkCameraOrientationWidget>
+  MakeCameraOrientationWidget(vtkRenderWindowInteractor *interactor,
+                              vtkRenderer *renderer);
+
   void Reset();
   void ZoomAuto();
 
@@ -73,6 +79,8 @@ public:
 
   vtkRenderWindowInteractor *GetInteractor();
 
+  vtkCameraOrientationWidget *GetCameraWidget();
+
   void addProp(vtkProp *prop);
 
   void RemoveProp(vtkProp *prop);
@@ -85,6 +93,7 @@ private:
   vtkRenderWindow *m_RenderWindow;
   vtkCornerAnnotation *m_Annotation;
   vtkOrientationMarkerWidget *m_Marker;
+  vtkCameraOrientationWidget *m_CameraWidget;
 };
 
 template <> class Tie<Viewer> {