qprojector.h

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// -----------------------------------------------------------------------------
//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
// Copyright (C) 2005 - 2026 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_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
template <int dim>
class ReferenceCell;
#endif
 
template <int dim>
class QProjector
{
public:
  using SubQuadrature = Quadrature<dim - 1>;
 
  static Quadrature<dim>
  project_to_face(const ReferenceCell<dim>          &reference_cell,
                  const SubQuadrature               &quadrature,
                  const unsigned int                 face_no,
                  const types::geometric_orientation combined_orientation);
 
  static Quadrature<dim>
  project_to_subface(const ReferenceCell<dim>          &reference_cell,
                     const SubQuadrature               &quadrature,
                     const unsigned int                 face_no,
                     const unsigned int                 subface_no,
                     const types::geometric_orientation combined_orientation,
                     const RefinementCase<dim - 1>     &ref_case);
 
  static Quadrature<dim>
  project_to_all_faces(const ReferenceCell<dim>       &reference_cell,
                       const hp::QCollection<dim - 1> &quadrature);
 
  static Quadrature<dim>
  project_to_all_faces(const ReferenceCell<dim>  &reference_cell,
                       const Quadrature<dim - 1> &quadrature);
 
  static Quadrature<dim>
  project_to_all_subfaces(const ReferenceCell<dim> &reference_cell,
                          const SubQuadrature      &quadrature);
 
  static Quadrature<dim>
  project_to_child(const ReferenceCell<dim> &reference_cell,
                   const Quadrature<dim>    &quadrature,
                   const unsigned int        child_no);
 
  static Quadrature<dim>
  project_to_all_children(const ReferenceCell<dim> &reference_cell,
                          const Quadrature<dim>    &quadrature);
 
  static Quadrature<dim>
  project_to_line(const ReferenceCell<dim> &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<dim>          &reference_cell,
         const unsigned int                 face_no,
         const types::geometric_orientation combined_orientation,
         const unsigned int                 n_quadrature_points);
 
    static DataSetDescriptor
    face(const ReferenceCell<dim>          &reference_cell,
         const unsigned int                 face_no,
         const types::geometric_orientation combined_orientation,
         const hp::QCollection<dim - 1>    &quadrature);
 
    static DataSetDescriptor
    subface(const ReferenceCell<dim>          &reference_cell,
            const unsigned int                 face_no,
            const unsigned int                 subface_no,
            const types::geometric_orientation combined_orientation,
            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<dim>  &reference_cell,
  const Quadrature<dim - 1> &quadrature)
{
  return project_to_all_faces(reference_cell,
                              hp::QCollection<dim - 1>(quadrature));
}
 
DEAL_II_NAMESPACE_CLOSE
 
#endif