grid_tools_cache.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2017 - 2021 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_grid_grid_tools_cache_h
#define dealii_grid_grid_tools_cache_h
 
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/exceptions.h>
#include <deal.II/base/point.h>
#include <deal.II/base/subscriptor.h>
 
#include <deal.II/fe/mapping_q1.h>
 
#include <deal.II/grid/grid_tools_cache_update_flags.h>
#include <deal.II/grid/tria.h>
#include <deal.II/grid/tria_accessor.h>
#include <deal.II/grid/tria_iterator.h>
 
#include <deal.II/numerics/rtree.h>
 
#include <boost/signals2.hpp>
 
#include <cmath>
 
DEAL_II_NAMESPACE_OPEN
 
namespace GridTools
{
  template <int dim, int spacedim = dim>
  class Cache : public Subscriptor
  {
  public:
    Cache(const Triangulation<dim, spacedim> &tria,
          const Mapping<dim, spacedim> &      mapping =
            (ReferenceCells::get_hypercube<dim>()
               .template get_default_linear_mapping<dim, spacedim>()));
 
    ~Cache() override;
 
    void
    mark_for_update(const CacheUpdateFlags &flags = update_all);
 
 
    const std::vector<
      std::set<typename Triangulation<dim, spacedim>::active_cell_iterator>> &
    get_vertex_to_cell_map() const;
 
    const std::vector<std::vector<Tensor<1, spacedim>>> &
    get_vertex_to_cell_centers_directions() const;
 
    const std::map<unsigned int, Point<spacedim>> &
    get_used_vertices() const;
 
    const RTree<std::pair<Point<spacedim>, unsigned int>> &
    get_used_vertices_rtree() const;
 
    const RTree<
      std::pair<BoundingBox<spacedim>,
                typename Triangulation<dim, spacedim>::active_cell_iterator>> &
    get_cell_bounding_boxes_rtree() const;
 
    const RTree<
      std::pair<BoundingBox<spacedim>,
                typename Triangulation<dim, spacedim>::active_cell_iterator>> &
    get_locally_owned_cell_bounding_boxes_rtree() const;
 
 
    const std::vector<std::set<unsigned int>> &
    get_vertex_to_neighbor_subdomain() const;
 
    const Triangulation<dim, spacedim> &
    get_triangulation() const;
 
    const Mapping<dim, spacedim> &
    get_mapping() const;
 
 
    const RTree<std::pair<BoundingBox<spacedim>, unsigned int>> &
    get_covering_rtree(const unsigned int level = 0) const;
 
  private:
    mutable CacheUpdateFlags update_flags;
 
    SmartPointer<const Triangulation<dim, spacedim>, Cache<dim, spacedim>> tria;
 
    SmartPointer<const Mapping<dim, spacedim>, Cache<dim, spacedim>> mapping;
 
 
    mutable std::vector<
      std::set<typename Triangulation<dim, spacedim>::active_cell_iterator>>
      vertex_to_cells;
 
    mutable std::vector<std::vector<Tensor<1, spacedim>>>
      vertex_to_cell_centers;
 
    mutable std::map<unsigned int,
                     RTree<std::pair<BoundingBox<spacedim>, unsigned int>>>
      covering_rtree;
 
    mutable std::map<unsigned int, Point<spacedim>> used_vertices;
 
    mutable RTree<std::pair<Point<spacedim>, unsigned int>> used_vertices_rtree;
 
    mutable RTree<
      std::pair<BoundingBox<spacedim>,
                typename Triangulation<dim, spacedim>::active_cell_iterator>>
      cell_bounding_boxes_rtree;
 
    mutable RTree<
      std::pair<BoundingBox<spacedim>,
                typename Triangulation<dim, spacedim>::active_cell_iterator>>
      locally_owned_cell_bounding_boxes_rtree;
 
 
    mutable std::vector<std::set<unsigned int>> vertex_to_neighbor_subdomain;
 
    boost::signals2::connection tria_signal;
  };
 
 
 
  // Inline functions
  template <int dim, int spacedim>
  inline const Triangulation<dim, spacedim> &
  Cache<dim, spacedim>::get_triangulation() const
  {
    return *tria;
  }
 
 
 
  template <int dim, int spacedim>
  inline const Mapping<dim, spacedim> &
  Cache<dim, spacedim>::get_mapping() const
  {
    return *mapping;
  }
} // namespace GridTools
 
 
 
DEAL_II_NAMESPACE_CLOSE
 
#endif