point_conversion.h

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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2022 - 2024 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Part of the source code is dual licensed under Apache-2.0 WITH
// LLVM-exception OR LGPL-2.1-or-later. Detailed license information
// governing the source code and code contributions can be found in
// LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II.
//
// ------------------------------------------------------------------------
 
#ifndef dealii_cgal_point_conversion_h
#define dealii_cgal_point_conversion_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/point.h>
 
#ifdef DEAL_II_WITH_CGAL
 
#  include <CGAL/version.h>
#  if CGAL_VERSION_MAJOR >= 6
#    include <CGAL/Installation/internal/disable_deprecation_warnings_and_errors.h>
#  endif
#  include <CGAL/Cartesian.h>
#  include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#  include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#  include <CGAL/Simple_cartesian.h>
 
 
DEAL_II_NAMESPACE_OPEN
namespace CGALWrappers
{
  template <typename CGALPointType, int dim>
  inline CGALPointType
  dealii_point_to_cgal_point(const ::Point<dim> &p);

  template <int dim, typename CGALPointType>
  inline ::Point<dim>
  cgal_point_to_dealii_point(const CGALPointType &p);
 
 
#  ifndef DOXYGEN
  // Template implementations
 
  template <typename CGALPointType, int dim>
  inline CGALPointType
  dealii_point_to_cgal_point(const ::Point<dim> &p)
  {
    constexpr int cdim = CGALPointType::Ambient_dimension::value;
    static_assert(dim <= cdim, "Only dim <= cdim supported");
    if constexpr (cdim == 1)
      return CGALPointType(p[0]);
    else if constexpr (cdim == 2)
      return CGALPointType(p[0], dim > 1 ? p[1] : 0);
    else if constexpr (cdim == 3)
      return CGALPointType(p[0], dim > 1 ? p[1] : 0, dim > 2 ? p[2] : 0);
    else
      DEAL_II_NOT_IMPLEMENTED();
    return CGALPointType();
  }
 
 
 
  template <int dim, typename CGALPointType>
  inline ::Point<dim>
  cgal_point_to_dealii_point(const CGALPointType &p)
  {
    constexpr int cdim = CGALPointType::Ambient_dimension::value;
    if constexpr (dim == 1)
      return ::Point<dim>(CGAL::to_double(p.x()));
    else if constexpr (dim == 2)
      return ::Point<dim>(CGAL::to_double(p.x()),
                                cdim > 1 ? CGAL::to_double(p.y()) : 0);
    else if constexpr (dim == 3)
      return ::Point<dim>(CGAL::to_double(p.x()),
                                cdim > 1 ? CGAL::to_double(p.y()) : 0,
                                cdim > 2 ? CGAL::to_double(p.z()) : 0);
    else
      DEAL_II_NOT_IMPLEMENTED();
  }
} // namespace CGALWrappers
 
#  endif
 
DEAL_II_NAMESPACE_CLOSE
 
#else
 
// Make sure the scripts that create the C++20 module input files have
// something to latch on if the preprocessor #ifdef above would
// otherwise lead to an empty content of the file.
DEAL_II_NAMESPACE_OPEN
DEAL_II_NAMESPACE_CLOSE
 
#endif
#endif