Revision 576c9c381f0280b3733360f9ae3166291146760e authored by Thomas Fischer on 31 March 2023, 10:42:09 UTC, committed by Thomas Fischer on 31 March 2023, 12:59:42 UTC
1 parent 87f76d7
NodeAdjacencyTable.h
/**
* \file
* \copyright
* Copyright (c) 2012-2023, OpenGeoSys Community (http://www.opengeosys.org)
* Distributed under a Modified BSD License.
* See accompanying file LICENSE.txt or
* http://www.opengeosys.org/project/license
*
*/
#pragma once
#include <algorithm>
#include <vector>
#include "Mesh.h"
#include "Node.h"
namespace MeshLib
{
/// Representation of topological node adjacency.
///
/// The topological sparsity pattern in the context of FEM is defined in terms
/// of supports of the nodal functions. Especially, two nodes i and j are called
/// adjacent if and only if there is a mesh element E including nodes i and j.
/// This information is represented by the NodeAdjacenceTable.
///
/// The topological adjacency of nodes is created by
/// MeshLib::calculateNodesConnectedByElements().
class NodeAdjacencyTable final
{
public:
explicit NodeAdjacencyTable(Mesh const& mesh)
{
_data.resize(mesh.getNodes().size());
createTable(mesh);
}
std::size_t size() const { return _data.size(); }
std::size_t getNodeDegree(std::size_t const node_id) const
{
return _data[node_id].size();
}
std::vector<std::size_t> const& getAdjacentNodes(
std::size_t const node_id) const
{
return _data[node_id];
}
void createTable(Mesh const& mesh)
{
auto const& nodes = mesh.getNodes();
if (_data.size() != nodes.size())
{
_data.resize(nodes.size());
}
auto const& connections =
MeshLib::calculateNodesConnectedByElements(mesh);
for (auto const* node : nodes)
{
auto const node_id = node->getID();
auto const& connected_nodes = connections[node_id];
std::vector<std::size_t>& row = _data[node_id];
row.reserve(connected_nodes.size());
std::transform(connected_nodes.cbegin(), connected_nodes.cend(),
std::back_inserter(row),
[](Node const* const n) { return n->getID(); });
}
}
private:
std::vector<std::vector<std::size_t>> _data;
};
} // namespace MeshLib
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