#include <deal.II/grid/grid_tools.h>

Inheritance diagram for GridTools::Cache< dim, spacedim >:

Public Member Functions
	Cache (const Triangulation< dim, spacedim > &tria, const Mapping< dim, spacedim > &mapping=StaticMappingQ1< dim, spacedim >::mapping)

	~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 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

const KDTree< spacedim > &	get_vertex_kdtree () const

Private Attributes
CacheUpdateFlags	update_flags

SmartPointer< const Triangulation< dim, spacedim >, Cache< dim, spacedim > >	tria

SmartPointer< const Mapping< dim, spacedim >, Cache< dim, spacedim > >	mapping

std::vector< std::set< typename Triangulation< dim, spacedim >::active_cell_iterator > >	vertex_to_cells

std::vector< std::vector< Tensor< 1, spacedim > > >	vertex_to_cell_centers

RTree< std::pair< BoundingBox< spacedim >, unsigned int > >	covering_rtree

KDTree< spacedim >	vertex_kdtree

std::map< unsigned int, Point< spacedim > >	used_vertices

RTree< std::pair< Point< spacedim >, unsigned int > >	used_vertices_rtree

RTree< std::pair< BoundingBox< spacedim >, typename Triangulation< dim, spacedim >::active_cell_iterator > >	cell_bounding_boxes_rtree

boost::signals2::connection	tria_signal

Detailed Description

template<int dim, int spacedim = dim>
class GridTools::Cache< dim, spacedim >

A class that caches computationally intensive information about a Triangulation.

This class attaches a signal to the Triangulation passed at construction time to keep track about refinement changes, and allows the user to query some of the data structures constructed using functions in the GridTools namespace which are computed only once, and then cached inside this class for faster access whenever the triangulation has not changed.

Notice that this class only notices if the underlying Triangulation has changed due to a Triangulation::Signals::any_change() signal being triggered.

If the triangulation changes for other reasons, for example because you use it in conjunction with a MappingQEulerian object that sees the vertices through its own transformation, or because you manually change some vertex locations, then some of the structures in this class become obsolete, and you will have to mark them as outdated, by calling the method mark_for_update() manually.

Author: Luca Heltai, 2017.

Definition at line 128 of file grid_tools.h.

Constructor & Destructor Documentation

◆ Cache()

template<int dim, int spacedim>

GridTools::Cache< dim, spacedim >::Cache	(	const Triangulation< dim, spacedim > &	tria,
		const Mapping< dim, spacedim > &	mapping = `StaticMappingQ1<dim, spacedim>::mapping`
	)

Constructor.

If you provide the optional mapping argument, then this is used whenever a mapping is required.

Parameters

tria	The triangulation for which to store information
mapping	The mapping to use when computing cached objects

Definition at line 28 of file grid_tools_cache.cc.

◆ ~Cache()

template<int dim, int spacedim>

GridTools::Cache< dim, spacedim >::~Cache

override

Destructor.

Definition at line 39 of file grid_tools_cache.cc.

Member Function Documentation

◆ mark_for_update()

template<int dim, int spacedim>

void GridTools::Cache< dim, spacedim >::mark_for_update ( const CacheUpdateFlags & flags = update_all )

Make sure that the objects marked for update are recomputed during subsequent calls to the get_* functions defined in this class.

Notice that no work is performed when you call this function. The actual data structures are computed the next time you call the corresponding get_* method.

Parameters

flags What to mark for update

Definition at line 51 of file grid_tools_cache.cc.

◆ get_vertex_to_cell_map()

template<int dim, int spacedim>

const std::vector< std::set< typename Triangulation< dim, spacedim >::active_cell_iterator > > & GridTools::Cache< dim, spacedim >::get_vertex_to_cell_map

Return the cached vertex_to_cell_map as computed by GridTools::vertex_to_cell_map().

Definition at line 61 of file grid_tools_cache.cc.

◆ get_vertex_to_cell_centers_directions()

template<int dim, int spacedim>

const std::vector< std::vector< Tensor< 1, spacedim > > > & GridTools::Cache< dim, spacedim >::get_vertex_to_cell_centers_directions

Return the cached vertex_to_cell_centers_directions as computed by GridTools::vertex_to_cell_centers_directions().

Definition at line 75 of file grid_tools_cache.cc.

◆ get_used_vertices()

template<int dim, int spacedim>

const std::map< unsigned int, Point< spacedim > > & GridTools::Cache< dim, spacedim >::get_used_vertices

Return the cached map of used vertices, as computed by GridTools::extract_used_vertices().

Definition at line 90 of file grid_tools_cache.cc.

◆ get_used_vertices_rtree()

template<int dim, int spacedim>

const RTree< std::pair< Point< spacedim >, unsigned int > > & GridTools::Cache< dim, spacedim >::get_used_vertices_rtree

Return the cached RTree object for the vertices, constructed using the used vertices of the triangulation.

Definition at line 104 of file grid_tools_cache.cc.

◆ get_cell_bounding_boxes_rtree()

template<int dim, int spacedim>

const RTree< std::pair< BoundingBox< spacedim >, typename Triangulation< dim, spacedim >::active_cell_iterator > > & GridTools::Cache< dim, spacedim >::get_cell_bounding_boxes_rtree

Return the cached RTree object of the cell bounging boxes, constructed using the active cell iterators of the stored triangulation.

Definition at line 126 of file grid_tools_cache.cc.

◆ get_triangulation()

template<int dim, int spacedim>

const Triangulation< dim, spacedim > & GridTools::Cache< dim, spacedim >::get_triangulation

inline

Return a reference to the stored triangulation.

Definition at line 265 of file grid_tools_cache.h.

◆ get_mapping()

template<int dim, int spacedim>

const Mapping< dim, spacedim > & GridTools::Cache< dim, spacedim >::get_mapping

inline

Return a reference to the stored mapping.

Definition at line 274 of file grid_tools_cache.h.

◆ get_covering_rtree()

template<int dim, int spacedim>

const RTree< std::pair< BoundingBox< spacedim >, unsigned int > > & GridTools::Cache< dim, spacedim >::get_covering_rtree

This function returns an object that allows identifying which process(es) in a parallel computation may own the cell that surrounds a given point. The elements of this object – an Rtree – are pairs of bounding boxes denoting areas that cover all or parts of the local portion of a parallel triangulation, and an unsigned int representing the process or subdomain that owns these cells. Given a point on a parallel::TriangulationBase, this tree allows to identify one, or few candidate processes, for which the point lies on a locally owned cell.

Constructing or updating the rtree requires a call to GridTools::build_global_description_tree(), which exchanges bounding boxes between all processes using Utilities::MPI::all_gather(), a collective operation. Therefore this function must be called by all processes at the same time.

While each box may only cover part of a process's locally owned part of the triangulation, the boxes associated with each process jointly cover the entire local portion.

Definition at line 163 of file grid_tools_cache.cc.

◆ get_vertex_kdtree()

template<int dim, int spacedim>

const KDTree< spacedim > & GridTools::Cache< dim, spacedim >::get_vertex_kdtree

Return the cached vertex_kdtree object, constructed with the vertices of the stored triangulation.

Definition at line 148 of file grid_tools_cache.cc.

Member Data Documentation

◆ update_flags

template<int dim, int spacedim = dim>

CacheUpdateFlags GridTools::Cache< dim, spacedim >::update_flags

mutableprivate

Keep track of what needs to be updated next.

Definition at line 193 of file grid_tools_cache.h.

◆ tria

template<int dim, int spacedim = dim>

SmartPointer<const Triangulation<dim, spacedim>, Cache<dim, spacedim> > GridTools::Cache< dim, spacedim >::tria

private

A pointer to the Triangulation.

Definition at line 198 of file grid_tools_cache.h.

◆ mapping

template<int dim, int spacedim = dim>

SmartPointer<const Mapping<dim, spacedim>, Cache<dim, spacedim> > GridTools::Cache< dim, spacedim >::mapping

private

Mapping to use when computing on the Triangulation.

Definition at line 203 of file grid_tools_cache.h.

◆ vertex_to_cells

template<int dim, int spacedim = dim>

std::vector< std::set<typename Triangulation<dim, spacedim>::active_cell_iterator> > GridTools::Cache< dim, spacedim >::vertex_to_cells

mutableprivate

Store vertex to cell map information, as generated by GridTools::vertex_to_cell_map()

Definition at line 212 of file grid_tools_cache.h.

◆ vertex_to_cell_centers

template<int dim, int spacedim = dim>

std::vector<std::vector<Tensor<1, spacedim> > > GridTools::Cache< dim, spacedim >::vertex_to_cell_centers

mutableprivate

Store vertex to cell center directions, as generated by GridTools::vertex_to_cell_centers_directions().

Definition at line 219 of file grid_tools_cache.h.

◆ covering_rtree

template<int dim, int spacedim = dim>

RTree<std::pair<BoundingBox<spacedim>, unsigned int> > GridTools::Cache< dim, spacedim >::covering_rtree

mutableprivate

An rtree object covering the whole mesh.

Definition at line 225 of file grid_tools_cache.h.

◆ vertex_kdtree

template<int dim, int spacedim = dim>

KDTree<spacedim> GridTools::Cache< dim, spacedim >::vertex_kdtree

mutableprivate

A KDTree object constructed with the vertices of the triangulation.

Definition at line 231 of file grid_tools_cache.h.

◆ used_vertices

template<int dim, int spacedim = dim>

std::map<unsigned int, Point<spacedim> > GridTools::Cache< dim, spacedim >::used_vertices

mutableprivate

Store the used vertices of the Triangulation, as generated by GridTools::extract_used_vertices().

Definition at line 238 of file grid_tools_cache.h.

◆ used_vertices_rtree

template<int dim, int spacedim = dim>

RTree<std::pair<Point<spacedim>, unsigned int> > GridTools::Cache< dim, spacedim >::used_vertices_rtree

mutableprivate

Store an RTree object, containing the used vertices of the triangulation.

Definition at line 243 of file grid_tools_cache.h.

◆ cell_bounding_boxes_rtree

template<int dim, int spacedim = dim>

RTree< std::pair<BoundingBox<spacedim>, typename Triangulation<dim, spacedim>::active_cell_iterator> > GridTools::Cache< dim, spacedim >::cell_bounding_boxes_rtree

mutableprivate

Store an RTree object, containing the bounding boxes of the cells of the triangulation.

Definition at line 252 of file grid_tools_cache.h.

◆ tria_signal

template<int dim, int spacedim = dim>

boost::signals2::connection GridTools::Cache< dim, spacedim >::tria_signal

private

Storage for the status of the triangulation signal.

Definition at line 257 of file grid_tools_cache.h.

The documentation for this class was generated from the following files:

include/deal.II/grid/grid_tools.h
include/deal.II/grid/grid_tools_cache.h
source/grid/grid_tools_cache.cc

Public Member Functions

Private Attributes

Detailed Description

template<int dim, int spacedim = dim> class GridTools::Cache< dim, spacedim >

Constructor & Destructor Documentation

◆ Cache()

◆ ~Cache()

Member Function Documentation

◆ mark_for_update()

◆ get_vertex_to_cell_map()

◆ get_vertex_to_cell_centers_directions()

◆ get_used_vertices()

◆ get_used_vertices_rtree()

◆ get_cell_bounding_boxes_rtree()

◆ get_triangulation()

◆ get_mapping()

◆ get_covering_rtree()

◆ get_vertex_kdtree()

Member Data Documentation

◆ update_flags

◆ tria

◆ mapping

◆ vertex_to_cells

◆ vertex_to_cell_centers

◆ covering_rtree

◆ vertex_kdtree

◆ used_vertices

◆ used_vertices_rtree

◆ cell_bounding_boxes_rtree

◆ tria_signal

template<int dim, int spacedim = dim>
class GridTools::Cache< dim, spacedim >