mapping_q1_eulerian.h

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// -----------------------------------------------------------------------------
//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
// Copyright (C) 2001 - 2025 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Detailed license information governing the source code and contributions
// can be found in LICENSE.md and CONTRIBUTING.md at the top level directory.
//
// -----------------------------------------------------------------------------
 
#ifndef dealii_mapping_q1_eulerian_h
#define dealii_mapping_q1_eulerian_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/observer_pointer.h>
 
#include <deal.II/dofs/dof_handler.h>
 
#include <deal.II/fe/mapping_q.h>
 
#include <boost/container/small_vector.hpp>
 
#include <array>
 
DEAL_II_NAMESPACE_OPEN
 
template <typename>
class Vector;
 
 
template <int dim, typename VectorType = Vector<double>, int spacedim = dim>
class MappingQ1Eulerian : public MappingQ<dim, spacedim>
{
public:
  MappingQ1Eulerian(const DoFHandler<dim, spacedim> &euler_dof_handler,
                    const VectorType                &euler_vector);
 
  virtual boost::container::small_vector<Point<spacedim>,
#ifndef _MSC_VER
                                         ReferenceCells::max_n_vertices<dim>()
#else
                                         GeometryInfo<dim>::vertices_per_cell
#endif
                                         >
  get_vertices(const typename Triangulation<dim, spacedim>::cell_iterator &cell)
    const override;
 
  virtual std::unique_ptr<Mapping<dim, spacedim>>
  clone() const override;
 
  virtual bool
  preserves_vertex_locations() const override;
 
  DeclException0(ExcInactiveCell);
 
 
 
protected:
  virtual CellSimilarity::Similarity
  fill_fe_values(
    const typename Triangulation<dim, spacedim>::cell_iterator &cell,
    const CellSimilarity::Similarity                            cell_similarity,
    const Quadrature<dim>                                      &quadrature,
    const typename Mapping<dim, spacedim>::InternalDataBase    &internal_data,
    internal::FEValuesImplementation::MappingRelatedData<dim, spacedim>
      &output_data) const override;
 
  virtual void
  compute_mapping_support_points(
    const typename Triangulation<dim, spacedim>::cell_iterator &cell,
    boost::container::small_vector<Point<spacedim>, 200>       &points)
    const override;
 
  ObserverPointer<const VectorType,
                  MappingQ1Eulerian<dim, VectorType, spacedim>>
    euler_transform_vectors;
 
  ObserverPointer<const DoFHandler<dim, spacedim>,
                  MappingQ1Eulerian<dim, VectorType, spacedim>>
    shiftmap_dof_handler;
};
 
/*----------------------------------------------------------------------*/
 
#ifndef DOXYGEN
 
template <int dim, typename VectorType, int spacedim>
inline bool
MappingQ1Eulerian<dim, VectorType, spacedim>::preserves_vertex_locations() const
{
  return false;
}
 
#endif // DOXYGEN
 
DEAL_II_NAMESPACE_CLOSE
 
#endif