qprojector.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2005 - 2023 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_qprojector_h
#define dealii_qprojector_h
 
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/geometry_info.h>
#include <deal.II/base/quadrature.h>
 
#include <deal.II/hp/q_collection.h>
 
DEAL_II_NAMESPACE_OPEN
 
#ifndef DOXYGEN
class ReferenceCell;
#endif
 
template <int dim>
class QProjector
{
public:
  using SubQuadrature = Quadrature<dim - 1>;
 
  static void
  project_to_face(const ReferenceCell &    reference_cell,
                  const SubQuadrature &    quadrature,
                  const unsigned int       face_no,
                  std::vector<Point<dim>> &q_points);
 
  static Quadrature<dim>
  project_to_face(const ReferenceCell &reference_cell,
                  const SubQuadrature &quadrature,
                  const unsigned int   face_no);
 
  static Quadrature<dim>
  project_to_oriented_face(const ReferenceCell &reference_cell,
                           const SubQuadrature &quadrature,
                           const unsigned int   face_no,
                           const bool           face_orientation,
                           const bool           face_flip,
                           const bool           face_rotation);
 
  static void
  project_to_subface(const ReferenceCell &          reference_cell,
                     const SubQuadrature &          quadrature,
                     const unsigned int             face_no,
                     const unsigned int             subface_no,
                     std::vector<Point<dim>> &      q_points,
                     const RefinementCase<dim - 1> &ref_case =
                       RefinementCase<dim - 1>::isotropic_refinement);
 
  static Quadrature<dim>
  project_to_subface(const ReferenceCell &          reference_cell,
                     const SubQuadrature &          quadrature,
                     const unsigned int             face_no,
                     const unsigned int             subface_no,
                     const RefinementCase<dim - 1> &ref_case =
                       RefinementCase<dim - 1>::isotropic_refinement);
 
  static Quadrature<dim>
  project_to_oriented_subface(const ReferenceCell &            reference_cell,
                              const SubQuadrature &            quadrature,
                              const unsigned int               face_no,
                              const unsigned int               subface_no,
                              const bool                       face_orientation,
                              const bool                       face_flip,
                              const bool                       face_rotation,
                              const internal::SubfaceCase<dim> ref_case);
 
  static Quadrature<dim>
  project_to_all_faces(const ReferenceCell &           reference_cell,
                       const hp::QCollection<dim - 1> &quadrature);
 
  static Quadrature<dim>
  project_to_all_faces(const ReferenceCell &      reference_cell,
                       const Quadrature<dim - 1> &quadrature);
 
  static Quadrature<dim>
  project_to_all_subfaces(const ReferenceCell &reference_cell,
                          const SubQuadrature &quadrature);
 
  static Quadrature<dim>
  project_to_child(const ReferenceCell &  reference_cell,
                   const Quadrature<dim> &quadrature,
                   const unsigned int     child_no);
 
  static Quadrature<dim>
  project_to_all_children(const ReferenceCell &  reference_cell,
                          const Quadrature<dim> &quadrature);
 
  static Quadrature<dim>
  project_to_line(const ReferenceCell &reference_cell,
                  const Quadrature<1> &quadrature,
                  const Point<dim> &   p1,
                  const Point<dim> &   p2);
 
  class DataSetDescriptor
  {
  public:
    DataSetDescriptor();
 
    static DataSetDescriptor
    cell();
 
    static DataSetDescriptor
    face(const ReferenceCell &reference_cell,
         const unsigned int   face_no,
         const bool           face_orientation,
         const bool           face_flip,
         const bool           face_rotation,
         const unsigned int   n_quadrature_points);
 
    static DataSetDescriptor
    face(const ReferenceCell &           reference_cell,
         const unsigned int              face_no,
         const bool                      face_orientation,
         const bool                      face_flip,
         const bool                      face_rotation,
         const hp::QCollection<dim - 1> &quadrature);
 
    static DataSetDescriptor
    subface(const ReferenceCell &            reference_cell,
            const unsigned int               face_no,
            const unsigned int               subface_no,
            const bool                       face_orientation,
            const bool                       face_flip,
            const bool                       face_rotation,
            const unsigned int               n_quadrature_points,
            const internal::SubfaceCase<dim> ref_case =
              internal::SubfaceCase<dim>::case_isotropic);
 
    operator unsigned int() const;
 
  private:
    const unsigned int dataset_offset;
 
    DataSetDescriptor(const unsigned int dataset_offset);
  };
};
 
// -------------------  inline and template functions ----------------
 
 
 
template <int dim>
inline QProjector<dim>::DataSetDescriptor::DataSetDescriptor(
  const unsigned int dataset_offset)
  : dataset_offset(dataset_offset)
{}
 
 
template <int dim>
inline QProjector<dim>::DataSetDescriptor::DataSetDescriptor()
  : dataset_offset(numbers::invalid_unsigned_int)
{}
 
 
 
template <int dim>
typename QProjector<dim>::DataSetDescriptor
QProjector<dim>::DataSetDescriptor::cell()
{
  return 0;
}
 
 
 
template <int dim>
inline QProjector<dim>::DataSetDescriptor::operator unsigned int() const
{
  return dataset_offset;
}
 
 
 
template <int dim>
Quadrature<dim> inline QProjector<dim>::project_to_all_faces(
  const ReferenceCell &      reference_cell,
  const Quadrature<dim - 1> &quadrature)
{
  return project_to_all_faces(reference_cell,
                              hp::QCollection<dim - 1>(quadrature));
}
 
 
/* -------------- declaration of explicit specializations ------------- */
 
#ifndef DOXYGEN
 
 
template <>
void
QProjector<1>::project_to_face(const ReferenceCell &reference_cell,
                               const Quadrature<0> &,
                               const unsigned int,
                               std::vector<Point<1>> &);
template <>
void
QProjector<2>::project_to_face(const ReferenceCell &  reference_cell,
                               const Quadrature<1> &  quadrature,
                               const unsigned int     face_no,
                               std::vector<Point<2>> &q_points);
template <>
void
QProjector<3>::project_to_face(const ReferenceCell &  reference_cell,
                               const Quadrature<2> &  quadrature,
                               const unsigned int     face_no,
                               std::vector<Point<3>> &q_points);
 
template <>
Quadrature<1>
QProjector<1>::project_to_all_faces(const ReferenceCell &     reference_cell,
                                    const hp::QCollection<0> &quadrature);
 
 
template <>
void
QProjector<1>::project_to_subface(const ReferenceCell &reference_cell,
                                  const Quadrature<0> &,
                                  const unsigned int,
                                  const unsigned int,
                                  std::vector<Point<1>> &,
                                  const RefinementCase<0> &);
template <>
void
QProjector<2>::project_to_subface(const ReferenceCell &  reference_cell,
                                  const Quadrature<1> &  quadrature,
                                  const unsigned int     face_no,
                                  const unsigned int     subface_no,
                                  std::vector<Point<2>> &q_points,
                                  const RefinementCase<1> &);
template <>
void
QProjector<3>::project_to_subface(const ReferenceCell &    reference_cell,
                                  const Quadrature<2> &    quadrature,
                                  const unsigned int       face_no,
                                  const unsigned int       subface_no,
                                  std::vector<Point<3>> &  q_points,
                                  const RefinementCase<2> &face_ref_case);
 
template <>
Quadrature<1>
QProjector<1>::project_to_all_subfaces(const ReferenceCell &reference_cell,
                                       const Quadrature<0> &quadrature);
 
 
#endif // DOXYGEN
DEAL_II_NAMESPACE_CLOSE
 
#endif