dof_renumbering.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2003 - 2018 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------

#ifndef dealii_dof_renumbering_h
#define dealii_dof_renumbering_h


#include <deal.II/base/config.h>

#include <deal.II/base/exceptions.h>
#include <deal.II/base/point.h>

#include <deal.II/dofs/dof_handler.h>

#include <deal.II/hp/dof_handler.h>

#include <vector>

DEAL_II_NAMESPACE_OPEN

namespace DoFRenumbering
{
  template <class Iterator, int dim>
  struct CompareDownstream
  {
    CompareDownstream(const Tensor<1, dim> &dir)
      : dir(dir)
    {}
    bool
    operator()(const Iterator &c1, const Iterator &c2) const
    {
      const Tensor<1, dim> diff = c2->center() - c1->center();
      return (diff * dir > 0);
    }

  private:
    const Tensor<1, dim> dir;
  };


  template <int dim>
  struct ComparePointwiseDownstream
  {
    ComparePointwiseDownstream(const Tensor<1, dim> &dir)
      : dir(dir)
    {}
    bool
    operator()(const std::pair<Point<dim>, types::global_dof_index> &c1,
               const std::pair<Point<dim>, types::global_dof_index> &c2) const
    {
      const Tensor<1, dim> diff = c2.first - c1.first;
      return (diff * dir > 0 || (diff * dir == 0 && c1.second < c2.second));
    }

  private:
    const Tensor<1, dim> dir;
  };



  namespace boost
  {
    template <typename DoFHandlerType>
    void
    Cuthill_McKee(DoFHandlerType &dof_handler,
                  const bool      reversed_numbering = false,
                  const bool      use_constraints    = false);

    template <typename DoFHandlerType>
    void
    compute_Cuthill_McKee(std::vector<types::global_dof_index> &new_dof_indices,
                          const DoFHandlerType &,
                          const bool reversed_numbering = false,
                          const bool use_constraints    = false);

    template <typename DoFHandlerType>
    void
    king_ordering(DoFHandlerType &dof_handler,
                  const bool      reversed_numbering = false,
                  const bool      use_constraints    = false);

    template <typename DoFHandlerType>
    void
    compute_king_ordering(std::vector<types::global_dof_index> &new_dof_indices,
                          const DoFHandlerType &,
                          const bool reversed_numbering = false,
                          const bool use_constraints    = false);

    template <typename DoFHandlerType>
    void
    minimum_degree(DoFHandlerType &dof_handler,
                   const bool      reversed_numbering = false,
                   const bool      use_constraints    = false);

    template <typename DoFHandlerType>
    void
    compute_minimum_degree(
      std::vector<types::global_dof_index> &new_dof_indices,
      const DoFHandlerType &,
      const bool reversed_numbering = false,
      const bool use_constraints    = false);
  } // namespace boost

  template <typename DoFHandlerType>
  void
  Cuthill_McKee(DoFHandlerType &dof_handler,
                const bool      reversed_numbering = false,
                const bool      use_constraints    = false,
                const std::vector<types::global_dof_index> &starting_indices =
                  std::vector<types::global_dof_index>());

  template <typename DoFHandlerType>
  void
  compute_Cuthill_McKee(
    std::vector<types::global_dof_index> &new_dof_indices,
    const DoFHandlerType &,
    const bool                                  reversed_numbering = false,
    const bool                                  use_constraints    = false,
    const std::vector<types::global_dof_index> &starting_indices =
      std::vector<types::global_dof_index>());

  template <typename DoFHandlerType>
  void
  Cuthill_McKee(DoFHandlerType &   dof_handler,
                const unsigned int level,
                const bool         reversed_numbering = false,
                const std::vector<types::global_dof_index> &starting_indices =
                  std::vector<types::global_dof_index>());

  template <typename DoFHandlerType>
  void
  component_wise(DoFHandlerType &                 dof_handler,
                 const std::vector<unsigned int> &target_component =
                   std::vector<unsigned int>());


  template <typename DoFHandlerType>
  void
  component_wise(DoFHandlerType &                 dof_handler,
                 const unsigned int               level,
                 const std::vector<unsigned int> &target_component =
                   std::vector<unsigned int>());

  template <int dim, int spacedim, typename CellIterator>
  types::global_dof_index
  compute_component_wise(std::vector<types::global_dof_index> &new_dof_indices,
                         const CellIterator &                  start,
                         const typename identity<CellIterator>::type &end,
                         const std::vector<unsigned int> &target_component,
                         const bool                       is_level_operation);

  template <int dim, int spacedim>
  void
  block_wise(DoFHandler<dim, spacedim> &dof_handler);

  template <int dim, int spacedim>
  void
  block_wise(DoFHandler<dim, spacedim> &dof_handler, const unsigned int level);

  template <int dim, int spacedim>
  void
  block_wise(hp::DoFHandler<dim, spacedim> &dof_handler);

  template <int dim, int spacedim, class ITERATOR, class ENDITERATOR>
  types::global_dof_index
  compute_block_wise(std::vector<types::global_dof_index> &new_dof_indices,
                     const ITERATOR &                      start,
                     const ENDITERATOR &                   end,
                     bool                                  is_level_operation);

  template <int dim>
  void
  hierarchical(DoFHandler<dim> &dof_handler);

  template <typename DoFHandlerType>
  void
  cell_wise(DoFHandlerType &dof_handler,
            const std::vector<typename DoFHandlerType::active_cell_iterator>
              &cell_order);

  template <typename DoFHandlerType>
  void
  compute_cell_wise(
    std::vector<types::global_dof_index> &renumbering,
    std::vector<types::global_dof_index> &inverse_renumbering,
    const DoFHandlerType &                dof_handler,
    const std::vector<typename DoFHandlerType::active_cell_iterator>
      &cell_order);

  template <typename DoFHandlerType>
  void
  cell_wise(DoFHandlerType &   dof_handler,
            const unsigned int level,
            const std::vector<typename DoFHandlerType::level_cell_iterator>
              &cell_order);

  template <typename DoFHandlerType>
  void
  compute_cell_wise(
    std::vector<types::global_dof_index> &renumbering,
    std::vector<types::global_dof_index> &inverse_renumbering,
    const DoFHandlerType &                dof_handler,
    const unsigned int                    level,
    const std::vector<typename DoFHandlerType::level_cell_iterator>
      &cell_order);

  template <typename DoFHandlerType>
  void
  downstream(DoFHandlerType &                                  dof_handler,
             const Tensor<1, DoFHandlerType::space_dimension> &direction,
             const bool dof_wise_renumbering = false);


  template <typename DoFHandlerType>
  void
  downstream(DoFHandlerType &                                  dof_handler,
             const unsigned int                                level,
             const Tensor<1, DoFHandlerType::space_dimension> &direction,
             const bool dof_wise_renumbering = false);

  template <typename DoFHandlerType>
  void
  compute_downstream(
    std::vector<types::global_dof_index> &            new_dof_indices,
    std::vector<types::global_dof_index> &            reverse,
    const DoFHandlerType &                            dof_handler,
    const Tensor<1, DoFHandlerType::space_dimension> &direction,
    const bool                                        dof_wise_renumbering);

  template <typename DoFHandlerType>
  void
  compute_downstream(
    std::vector<types::global_dof_index> &            new_dof_indices,
    std::vector<types::global_dof_index> &            reverse,
    const DoFHandlerType &                            dof_handler,
    const unsigned int                                level,
    const Tensor<1, DoFHandlerType::space_dimension> &direction,
    const bool                                        dof_wise_renumbering);

  template <typename DoFHandlerType>
  void
  clockwise_dg(DoFHandlerType &                              dof_handler,
               const Point<DoFHandlerType::space_dimension> &center,
               const bool                                    counter = false);

  template <typename DoFHandlerType>
  void
  clockwise_dg(DoFHandlerType &                              dof_handler,
               const unsigned int                            level,
               const Point<DoFHandlerType::space_dimension> &center,
               const bool                                    counter = false);

  template <typename DoFHandlerType>
  void
  compute_clockwise_dg(std::vector<types::global_dof_index> &new_dof_indices,
                       const DoFHandlerType &                dof_handler,
                       const Point<DoFHandlerType::space_dimension> &center,
                       const bool                                    counter);

  template <typename DoFHandlerType>
  void
  sort_selected_dofs_back(DoFHandlerType &         dof_handler,
                          const std::vector<bool> &selected_dofs);

  template <typename DoFHandlerType>
  void
  sort_selected_dofs_back(DoFHandlerType &         dof_handler,
                          const std::vector<bool> &selected_dofs,
                          const unsigned int       level);

  template <typename DoFHandlerType>
  void
  compute_sort_selected_dofs_back(
    std::vector<types::global_dof_index> &new_dof_indices,
    const DoFHandlerType &                dof_handler,
    const std::vector<bool> &             selected_dofs);

  template <typename DoFHandlerType>
  void
  compute_sort_selected_dofs_back(
    std::vector<types::global_dof_index> &new_dof_indices,
    const DoFHandlerType &                dof_handler,
    const std::vector<bool> &             selected_dofs,
    const unsigned int                    level);

  template <typename DoFHandlerType>
  void
  random(DoFHandlerType &dof_handler);

  template <typename DoFHandlerType>
  void
  compute_random(std::vector<types::global_dof_index> &new_dof_indices,
                 const DoFHandlerType &                dof_handler);

  template <typename DoFHandlerType>
  void
  subdomain_wise(DoFHandlerType &dof_handler);

  template <typename DoFHandlerType>
  void
  compute_subdomain_wise(std::vector<types::global_dof_index> &new_dof_indices,
                         const DoFHandlerType &                dof_handler);

  DeclExceptionMsg(ExcDoFHandlerNotInitialized,
                   "The DoFHandler on which this function should work has not "
                   "been initialized, i.e., it doesn't appear that DoF indices "
                   "have been distributed on it.");

  DeclException0(ExcInvalidComponentOrder);

  DeclException0(ExcNotDGFEM);
} // namespace DoFRenumbering


DEAL_II_NAMESPACE_CLOSE

#endif