add calc_centroid methods for all elements returning calc_face_centroid, calc_edge_midpoint and point respectively

src/OpenMesh/Core/Mesh/PolyMeshT.hh

@@ -276,9 +276,24 @@ public:
       _pt = calc_face_centroid(_fh);
   }
 
-  /// Computes and returns the average of the vertices defining _gh
+  /// Computes and returns the average of the vertices defining _fh
   Point calc_face_centroid(FaceHandle _fh) const;
 
+  /// Computes and returns the average of the vertices defining _fh (same as calc_face_centroid)
+  Point calc_centroid(FaceHandle _fh) const;
+
+  /// Computes and returns the average of the vertices defining _eh (same as calc_edge_midpoint)
+  Point calc_centroid(EdgeHandle _eh) const;
+
+  /// Computes and returns the average of the vertices defining _heh (same as calc_edge_midpoint for edge of halfedge)
+  Point calc_centroid(HalfedgeHandle _heh) const;
+
+  /// Returns the point of _vh
+  Point calc_centroid(VertexHandle _vh) const;
+
+  /// Computes and returns the average of the vertices defining the mesh
+  Point calc_centroid(MeshHandle _mh) const;
+
   /// Update normal for halfedge _heh
   void update_normal(HalfedgeHandle _heh, const double _feature_angle = 0.8)
   { this->set_normal(_heh, calc_halfedge_normal(_heh,_feature_angle)); }

src/OpenMesh/Core/Mesh/PolyMeshT_impl.hh

@@ -250,8 +250,58 @@ calc_face_centroid(FaceHandle _fh) const
   _pt /= valence;
   return _pt;
 }
+
 //-----------------------------------------------------------------------------
 
+template<class Kernel>
+typename PolyMeshT<Kernel>::Point
+PolyMeshT<Kernel>::
+calc_centroid(FaceHandle _fh) const
+{
+  return calc_face_centroid(_fh);
+}
+
+//-----------------------------------------------------------------------------
+
+template<class Kernel>
+typename PolyMeshT<Kernel>::Point
+PolyMeshT<Kernel>::
+calc_centroid(EdgeHandle _eh) const
+{
+  return this->calc_edge_midpoint(_eh);
+}
+
+//-----------------------------------------------------------------------------
+
+template<class Kernel>
+typename PolyMeshT<Kernel>::Point
+PolyMeshT<Kernel>::
+calc_centroid(HalfedgeHandle _heh) const
+{
+  return this->calc_edge_midpoint(this->edge_handle(_heh));
+}
+
+//-----------------------------------------------------------------------------
+
+template<class Kernel>
+typename PolyMeshT<Kernel>::Point
+PolyMeshT<Kernel>::
+calc_centroid(VertexHandle _vh) const
+{
+  return this->point(_vh);
+}
+
+//-----------------------------------------------------------------------------
+
+template<class Kernel>
+typename PolyMeshT<Kernel>::Point
+PolyMeshT<Kernel>::
+calc_centroid(MeshHandle /*_mh*/) const
+{
+  return this->vertices().avg(getPointsProperty(*this));
+}
+
+//-----------------------------------------------------------------------------
 
 template <class Kernel>
 void