transfinite_interpolation.h

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//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception or LGPL-2.1-or-later
// Copyright (C) 2007 - 2022 by Martin Kronbichler
// Copyright (C) 2008 - 2022 by David Wells
// Copyright (C) 2020 - 2025 by the ryujin authors
//
 
#pragma once
 
#include <compile_time_options.h>
 
#include <deal.II/base/config.h>
#include <deal.II/grid/manifold.h>
#include <deal.II/grid/tria.h>
 
namespace ryujin
{
  using namespace dealii; // FIXME: namespace pollution
 
  template <int dim, int spacedim = dim>
  class TransfiniteInterpolationManifold : public Manifold<dim, spacedim>
  {
  public:
    TransfiniteInterpolationManifold();
 
    ~TransfiniteInterpolationManifold() override = default;
 
    std::unique_ptr<Manifold<dim, spacedim>> clone() const override;
 
    void initialize(
        const Triangulation<dim, spacedim> &triangulation,
        const Manifold<dim, spacedim> &chart_manifold = FlatManifold<dim>());
 
    Point<spacedim>
    get_new_point(const ArrayView<const Point<spacedim>> &surrounding_points,
                  const ArrayView<const double> &weights) const override;
 
    void
    get_new_points(const ArrayView<const Point<spacedim>> &surrounding_points,
                   const Table<2, double> &weights,
                   ArrayView<Point<spacedim>> new_points) const override;
 
  private:
    std::array<unsigned int, 20> get_possible_cells_around_points(
        const ArrayView<const Point<spacedim>> &surrounding_points) const;
 
    typename Triangulation<dim, spacedim>::cell_iterator compute_chart_points(
        const ArrayView<const Point<spacedim>> &surrounding_points,
        ArrayView<Point<dim>> chart_points) const;
 
    Point<dim>
    pull_back(const typename Triangulation<dim, spacedim>::cell_iterator &cell,
              const Point<spacedim> &p,
              const Point<dim> &initial_guess) const;
 
    Point<spacedim> push_forward(
        const typename Triangulation<dim, spacedim>::cell_iterator &cell,
        const Point<dim> &chart_point) const;
 
    DerivativeForm<1, dim, spacedim> push_forward_gradient(
        const typename Triangulation<dim, spacedim>::cell_iterator &cell,
        const Point<dim> &chart_point,
        const Point<spacedim> &pushed_forward_chart_point) const;
 
    Triangulation<dim, spacedim> triangulation;
 
    int level_coarse;
 
    std::vector<bool> coarse_cell_is_flat;
 
    std::unique_ptr<Manifold<dim, spacedim>> chart_manifold;
  };
 
} // namespace ryujin