C++ MeshBase::clone方法代码示例

void ErrorVector::plot_error(const std::string& filename,
                             const MeshBase& oldmesh) const
{
  AutoPtr<MeshBase> meshptr = oldmesh.clone();
  MeshBase &mesh = *meshptr;
  mesh.all_first_order();
  EquationSystems temp_es (mesh);
  ExplicitSystem& error_system
    = temp_es.add_system<ExplicitSystem> ("Error");
  error_system.add_variable("error", CONSTANT, MONOMIAL);
  temp_es.init();

  const DofMap& error_dof_map = error_system.get_dof_map();

  MeshBase::const_element_iterator       el     =
    mesh.active_local_elements_begin();
  const MeshBase::const_element_iterator end_el =
    mesh.active_local_elements_end();
  std::vector<unsigned int> dof_indices;

  for ( ; el != end_el; ++el)
  {
    const Elem* elem = *el;

    error_dof_map.dof_indices(elem, dof_indices);

    const unsigned int elem_id = elem->id();

    //0 for the monomial basis
    const unsigned int solution_index = dof_indices[0];

    // libMesh::out << "elem_number=" << elem_number << std::endl;
    libmesh_assert_less (elem_id, (*this).size());

    // We may have zero error values in special circumstances
    // libmesh_assert_greater ((*this)[elem_id], 0.);
    error_system.solution->set(solution_index, (*this)[elem_id]);
  }

  // We may have to renumber if the original numbering was not
  // contiguous.  Since this is just a temporary mesh, that's probably
  // fine.
  if (mesh.max_elem_id() != mesh.n_elem() ||
      mesh.max_node_id() != mesh.n_nodes())
    {
      mesh.allow_renumbering(true);
      mesh.renumber_nodes_and_elements();
    }

  if (filename.rfind(".gmv") < filename.size())
    {
      GMVIO(mesh).write_discontinuous_gmv(filename,
                                          temp_es, false);
    }
  else if (filename.rfind(".plt") < filename.size())
    {
      TecplotIO (mesh).write_equation_systems
        (filename, temp_es);
    }
#ifdef LIBMESH_HAVE_EXODUS_API
  else if( (filename.rfind(".exo") < filename.size()) ||
	   (filename.rfind(".e") < filename.size()) )
    {
      ExodusII_IO io(mesh);
      io.write(filename);
      io.write_element_data(temp_es);
    }
#endif
  else
    {
      libmesh_here();
      libMesh::err << "Warning: ErrorVector::plot_error currently only"
                    << " supports .gmv and .plt and .exo/.e (if enabled) output;" << std::endl;
      libMesh::err << "Could not recognize filename: " << filename
                    << std::endl;
    }
}

void ErrorVector::plot_error(const std::string & filename,
                             const MeshBase & oldmesh) const
{
  std::unique_ptr<MeshBase> meshptr = oldmesh.clone();
  MeshBase & mesh = *meshptr;

  // The all_first_order routine will prepare_for_use(), which would
  // break our ordering if elements get changed.
  mesh.allow_renumbering(false);
  mesh.all_first_order();

#ifdef LIBMESH_ENABLE_AMR
  // We don't want p elevation when plotting a single constant value
  // per element
  for (auto & elem : mesh.element_ptr_range())
    {
      elem->set_p_refinement_flag(Elem::DO_NOTHING);
      elem->set_p_level(0);
    }
#endif // LIBMESH_ENABLE_AMR

  EquationSystems temp_es (mesh);
  ExplicitSystem & error_system
    = temp_es.add_system<ExplicitSystem> ("Error");
  error_system.add_variable("error", CONSTANT, MONOMIAL);
  temp_es.init();

  const DofMap & error_dof_map = error_system.get_dof_map();
  std::vector<dof_id_type> dof_indices;

  for (const auto & elem : mesh.active_local_element_ptr_range())
    {
      error_dof_map.dof_indices(elem, dof_indices);

      const dof_id_type elem_id = elem->id();

      //0 for the monomial basis
      const dof_id_type solution_index = dof_indices[0];

      // libMesh::out << "elem_number=" << elem_number << std::endl;
      libmesh_assert_less (elem_id, (*this).size());

      // We may have zero error values in special circumstances
      // libmesh_assert_greater ((*this)[elem_id], 0.);
      error_system.solution->set(solution_index, (*this)[elem_id]);
    }

  error_system.solution->close();

  // We may have to renumber if the original numbering was not
  // contiguous.  Since this is just a temporary mesh, that's probably
  // fine.
  if (mesh.max_elem_id() != mesh.n_elem() ||
      mesh.max_node_id() != mesh.n_nodes())
    {
      mesh.allow_renumbering(true);
      mesh.renumber_nodes_and_elements();
    }

  if (filename.rfind(".gmv") < filename.size())
    {
      GMVIO(mesh).write_discontinuous_gmv(filename,
                                          temp_es, false);
    }
  else if (filename.rfind(".plt") < filename.size())
    {
      TecplotIO (mesh).write_equation_systems
        (filename, temp_es);
    }
#ifdef LIBMESH_HAVE_EXODUS_API
  else if ((filename.rfind(".exo") < filename.size()) ||
           (filename.rfind(".e") < filename.size()))
    {
      ExodusII_IO io(mesh);
      io.write(filename);
      io.write_element_data(temp_es);
    }
#endif
  else if (filename.rfind(".xda") < filename.size())
    {
      XdrIO(mesh).write("mesh-"+filename);
      temp_es.write("soln-"+filename,WRITE,
                    EquationSystems::WRITE_DATA |
                    EquationSystems::WRITE_ADDITIONAL_DATA);
    }
  else if (filename.rfind(".xdr") < filename.size())
    {
      XdrIO(mesh,true).write("mesh-"+filename);
      temp_es.write("soln-"+filename,ENCODE,
                    EquationSystems::WRITE_DATA |
                    EquationSystems::WRITE_ADDITIONAL_DATA);
    }
  else
    {
      libmesh_here();
      libMesh::err << "Warning: ErrorVector::plot_error currently only"
                   << " supports .gmv, .plt, .xdr/.xda, and .exo/.e (if enabled) output;" << std::endl;
      libMesh::err << "Could not recognize filename: " << filename
                   << std::endl;
    }
//.........这里部分代码省略.........