mesh_smoother_laplace.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_MESH_SMOOTHER_LAPLACE_H
#define LIBMESH_MESH_SMOOTHER_LAPLACE_H

// C++ Includes
#include <vector>

// Local Includes
#include "libmesh/libmesh.h"
#include "libmesh/mesh_smoother.h"

namespace libMesh
{

class LaplaceMeshSmoother : public MeshSmoother
{
public:
  explicit LaplaceMeshSmoother(UnstructuredMesh &mesh,
                               const unsigned int n_iterations);

#ifdef LIBMESH_ENABLE_DEPRECATED

  explicit LaplaceMeshSmoother(UnstructuredMesh &mesh)
      : LaplaceMeshSmoother(mesh, 1) {
    libmesh_deprecated();
  }
#endif

  virtual ~LaplaceMeshSmoother() = default;

  virtual void smooth() override;

#ifdef LIBMESH_ENABLE_DEPRECATED

  void smooth(unsigned int n_iterations);
#endif

  void init();

  void print_graph(std::ostream & out_stream = libMesh::out) const;

private:
  void allgather_graph();

  bool _initialized;

  std::vector<std::vector<dof_id_type>> _graph;

  unsigned int _n_iterations;
};


} // namespace libMesh

#endif // LIBMESH_MESH_SMOOTHER_LAPLACE_H