geometry.h

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//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Copyright (C) 2020 - 2026 by the ryujin authors
//
 
#pragma once
 
#include <compile_time_options.h>
 
#include "convenience_macros.h"
 
#include <deal.II/base/parameter_acceptor.h>
#include <deal.II/dofs/dof_handler.h>
#include <deal.II/grid/tria.h>
 
#include <functional>
#include <string>
 
namespace ryujin
{
#ifndef DOXYGEN
  /* forward declaration */
  template <int dim>
  class Discretization;
#endif
 
  template <int dim>
  class Geometry : public dealii::ParameterAcceptor
  {
  public:
    Geometry(const std::string &name, const std::string &subsection)
        : ParameterAcceptor(subsection + "/" + name)
        , name_(name)
    {
    }
 
    virtual void create_coarse_triangulation(
        dealii::Triangulation<dim> &triangulation) const = 0;
 
    virtual void
    update_dof_handler(dealii::DoFHandler<dim> & /*dof_handler*/) const
    {
    }
 
    enum class HP_Collection {
      /*
       * Instruct the Discretization class to set up standard
       * continuous/discontinuous Q_k spaces for quarilaterals/hexahedra.
       */
      standard_quadrilaterals,
      /*
       * Instruct the Discretization class to set up standard
       * continuous/discontinuous P_k spaces for simplices.
       */
      standard_simplices,
      /*
       * Inform the Discretization class that the hp::*Collection objects
       * have already been populated by the Geometry class.
       */
      populated_by_geometry
    };
 
    virtual HP_Collection populate_hp_collections(
        const unsigned int /*fe_degree*/,
        typename ryujin::Discretization<dim>::Collection & /*collection*/) const
    {
      /*
       * Signal, that we did nothing. In this case the Discretization
       * object will populate all collections with appropriate objects for
       * the cG Qk, dG Qk finite element on purely quadrilateral, or
       * hexahedral meshes.
       */
      return HP_Collection::standard_quadrilaterals;
    }
 
    ACCESSOR_READ_ONLY(transformation)
 
    
    ACCESSOR_READ_ONLY(name)
 
  protected:
    mutable std::function<dealii::Point<dim>(
        const typename dealii::Triangulation<dim>::cell_iterator &,
        const dealii::Point<dim> &)>
        transformation_;
 
  private:
    const std::string name_;
  };
 
} /* namespace ryujin */