fe_dgq.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2001 - 2018 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_fe_dgq_h
#define dealii_fe_dgq_h

#include <deal.II/base/config.h>

#include <deal.II/base/tensor_product_polynomials.h>
#include <deal.II/base/thread_management.h>

#include <deal.II/fe/fe_poly.h>

DEAL_II_NAMESPACE_OPEN

template <int dim, int spacedim>
class MappingQ;
template <int dim>
class Quadrature;


template <int dim, int spacedim = dim>
class FE_DGQ : public FE_Poly<TensorProductPolynomials<dim>, dim, spacedim>
{
public:
  FE_DGQ(const unsigned int p);

  virtual std::string
  get_name() const override;

  virtual void
  get_interpolation_matrix(const FiniteElement<dim, spacedim> &source,
                           FullMatrix<double> &matrix) const override;

  virtual void
  get_face_interpolation_matrix(const FiniteElement<dim, spacedim> &source,
                                FullMatrix<double> &matrix) const override;

  virtual void
  get_subface_interpolation_matrix(const FiniteElement<dim, spacedim> &source,
                                   const unsigned int                  subface,
                                   FullMatrix<double> &matrix) const override;

  virtual const FullMatrix<double> &
  get_restriction_matrix(
    const unsigned int         child,
    const RefinementCase<dim> &refinement_case =
      RefinementCase<dim>::isotropic_refinement) const override;

  virtual const FullMatrix<double> &
  get_prolongation_matrix(
    const unsigned int         child,
    const RefinementCase<dim> &refinement_case =
      RefinementCase<dim>::isotropic_refinement) const override;

  virtual std::vector<std::pair<unsigned int, unsigned int>>
  hp_vertex_dof_identities(
    const FiniteElement<dim, spacedim> &fe_other) const override;

  virtual std::vector<std::pair<unsigned int, unsigned int>>
  hp_line_dof_identities(
    const FiniteElement<dim, spacedim> &fe_other) const override;

  virtual std::vector<std::pair<unsigned int, unsigned int>>
  hp_quad_dof_identities(
    const FiniteElement<dim, spacedim> &fe_other) const override;

  virtual bool
  hp_constraints_are_implemented() const override;

  virtual FiniteElementDomination::Domination
  compare_for_face_domination(
    const FiniteElement<dim, spacedim> &fe_other) const override;

  virtual bool
  has_support_on_face(const unsigned int shape_index,
                      const unsigned int face_index) const override;

  virtual std::pair<Table<2, bool>, std::vector<unsigned int>>
  get_constant_modes() const override;

  virtual void
  convert_generalized_support_point_values_to_dof_values(
    const std::vector<Vector<double>> &support_point_values,
    std::vector<double> &              nodal_values) const override;

  virtual std::size_t
  memory_consumption() const override;

  virtual std::unique_ptr<FiniteElement<dim, spacedim>>
  clone() const override;

protected:
  FE_DGQ(const std::vector<Polynomials::Polynomial<double>> &polynomials);

private:
  static std::vector<unsigned int>
  get_dpo_vector(const unsigned int degree);

  void
  rotate_indices(std::vector<unsigned int> &indices,
                 const char                 direction) const;

  /*
   * Mutex for protecting initialization of restriction and embedding matrix.
   */
  mutable Threads::Mutex mutex;

  template <int dim1, int spacedim1>
  friend class FE_DGQ;

  template <int dim1, int spacedim1>
  friend class MappingQ;
};



template <int dim, int spacedim = dim>
class FE_DGQArbitraryNodes : public FE_DGQ<dim, spacedim>
{
public:
  FE_DGQArbitraryNodes(const Quadrature<1> &points);

  virtual std::string
  get_name() const override;

  virtual void
  convert_generalized_support_point_values_to_dof_values(
    const std::vector<Vector<double>> &support_point_values,
    std::vector<double> &              nodal_values) const override;
  virtual std::unique_ptr<FiniteElement<dim, spacedim>>
  clone() const override;
};



template <int dim, int spacedim = dim>
class FE_DGQLegendre : public FE_DGQ<dim, spacedim>
{
public:
  FE_DGQLegendre(const unsigned int degree);

  virtual std::pair<Table<2, bool>, std::vector<unsigned int>>
  get_constant_modes() const override;

  virtual std::string
  get_name() const override;

  virtual std::unique_ptr<FiniteElement<dim, spacedim>>
  clone() const override;
};



template <int dim, int spacedim = dim>
class FE_DGQHermite : public FE_DGQ<dim, spacedim>
{
public:
  FE_DGQHermite(const unsigned int degree);

  virtual std::string
  get_name() const override;

  virtual std::unique_ptr<FiniteElement<dim, spacedim>>
  clone() const override;
};


DEAL_II_NAMESPACE_CLOSE

#endif