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// Copyright (C) 2005-2022 Garth N. Wells and Jørgen S. Dokken
//
// This file is part of DOLFINx (https://www.fenicsproject.org)
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include "vtk_utils.h"
#include "cells.h"
#include <dolfinx/common/IndexMap.h>
#include <dolfinx/fem/DofMap.h>
#include <dolfinx/fem/FiniteElement.h>
#include <dolfinx/fem/FunctionSpace.h>
#include <dolfinx/mesh/Geometry.h>
#include <dolfinx/mesh/Mesh.h>
#include <dolfinx/mesh/Topology.h>
#include <span>
#include <tuple>
using namespace dolfinx;
//-----------------------------------------------------------------------------
std::pair<std::vector<std::int64_t>, std::array<std::size_t, 2>>
io::extract_vtk_connectivity(
MDSPAN_IMPL_STANDARD_NAMESPACE::mdspan<
const std::int32_t,
MDSPAN_IMPL_STANDARD_NAMESPACE::dextents<std::size_t, 2>>
dofmap_x,
mesh::CellType cell_type)
{
// Get DOLFINx to VTK permutation
const std::size_t num_nodes = dofmap_x.extent(1);
std::vector vtkmap
= io::cells::transpose(io::cells::perm_vtk(cell_type, num_nodes));
// Extract mesh 'nodes'
const std::size_t num_cells = dofmap_x.extent(0);
// Build mesh connectivity
// Loop over cells
std::array<std::size_t, 2> shape = {num_cells, num_nodes};
std::vector<std::int64_t> topology(shape[0] * shape[1]);
for (std::size_t c = 0; c < num_cells; ++c)
{
// For each cell, get the 'nodes' and place in VTK order
for (std::size_t i = 0; i < num_nodes; ++i)
topology[c * shape[1] + i] = dofmap_x(c, vtkmap[i]);
}
return {std::move(topology), shape};
}
//-----------------------------------------------------------------------------
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