vtk_io.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2024 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_VTK_IO_H
#define LIBMESH_VTK_IO_H

// Local includes
#include "libmesh/libmesh_common.h"
#include "libmesh/mesh_input.h"
#include "libmesh/mesh_output.h"
#include "libmesh/utility.h"

#ifdef LIBMESH_HAVE_VTK
// Ignore "deprecated...header" warning from strstream
#include "libmesh/ignore_warnings.h"
#include "vtkType.h"
#include "vtkSmartPointer.h"
#include "libmesh/restore_warnings.h"
#endif

// C++ includes
#include <cstddef>
#include <map>

// Forward declarations
class vtkUnstructuredGrid;

namespace libMesh
{

class MeshBase;

class VTKIO : public MeshInput<MeshBase>,
              public MeshOutput<MeshBase>
{
public:
  explicit
  VTKIO (MeshBase & mesh);

  explicit
  VTKIO (const MeshBase & mesh);

  using MeshOutput<MeshBase>::write_nodal_data;

  virtual void write_nodal_data (const std::string &,
                                 const std::vector<Number> &,
                                 const std::vector<std::string> &) override;

  virtual void read (const std::string &) override;

  virtual void write (const std::string &) override;

#ifdef LIBMESH_HAVE_VTK

  void set_compression(bool b);

  vtkUnstructuredGrid * get_vtk_grid();

private:
  void nodes_to_vtk();

  void cells_to_vtk();

  void node_values_to_vtk(const std::string & name,
                          const std::vector<Real> & local_values);

  void get_local_node_values(std::vector<Number> & local_values,
                             std::size_t variable,
                             const std::vector<Number> & soln,
                             const std::vector<std::string> & names);

  // void system_vectors_to_vtk(const EquationSystems & es,
  //                            vtkUnstructuredGrid * & grid);

  vtkSmartPointer<vtkUnstructuredGrid> _vtk_grid;

  bool _compress;

  std::map<dof_id_type, dof_id_type> _local_node_map;


  struct ElementMaps
  {
    // Associate libmesh_type with vtk_type (searchable in both directions).
    void associate(ElemType libmesh_type, vtkIdType vtk_type)
    {
      writing_map[libmesh_type] = vtk_type;
      reading_map[vtk_type] = libmesh_type;
    }

    // Find an entry in the writing map, or throw an error.
    vtkIdType find(ElemType libmesh_type)
    {
      return libmesh_map_find(writing_map, libmesh_type);
    }

    // Find an entry in the reading map, or throw an error.
    ElemType find(vtkIdType vtk_type)
    {
      return libmesh_map_find(reading_map, vtk_type);
    }

    std::map<ElemType, vtkIdType> writing_map;
    std::map<vtkIdType, ElemType> reading_map;
  };

  static std::map<ElemMappingType, ElementMaps> _element_maps;

  static std::map<ElemMappingType, ElementMaps> build_element_maps();

#endif
};



} // namespace libMesh


#endif // LIBMESH_VTK_IO_H