function_spherical.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2016 - 2019 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_function_spherical_h
#define dealii_function_spherical_h

#include <deal.II/base/config.h>

#include <deal.II/base/function.h>
#include <deal.II/base/point.h>

#include <array>

DEAL_II_NAMESPACE_OPEN

namespace Functions
{
  template <int dim>
  class Spherical : public Function<dim>
  {
  public:
    Spherical(const Point<dim> & center       = Point<dim>(),
              const unsigned int n_components = 1);

    virtual double
    value(const Point<dim> & point,
          const unsigned int component = 0) const override;

    virtual Tensor<1, dim>
    gradient(const Point<dim> & p,
             const unsigned int component = 0) const override;

    virtual SymmetricTensor<2, dim>
    hessian(const Point<dim> & p,
            const unsigned int component = 0) const override;

    std::size_t
    memory_consumption() const;

  private:
    virtual double
    svalue(const std::array<double, dim> &sp,
           const unsigned int             component) const;

    virtual std::array<double, dim>
    sgradient(const std::array<double, dim> &sp,
              const unsigned int             component) const;

    virtual std::array<double, 6>
    shessian(const std::array<double, dim> &sp,
             const unsigned int             component) const;

    const Tensor<1, dim> coordinate_system_offset;
  };
} // namespace Functions

DEAL_II_NAMESPACE_CLOSE

#endif