probability_density_function.h

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// ------------------------------------------------------
//
// SPDX-License-Identifier: GPL-2.0-or-later
//
// SPDX-FileCopyrightText: Copyright (C) 2015-2026 by the ASPECT authors.
//
// This file is part of ASPECT.
//
// Detailed license information governing the source code and
// contributions can be found in the folder LICENSES and in
// LICENSE and CONTRIBUTING.md at the top level directory.
//
// ------------------------------------------------------

#ifndef _aspect_particle_generator_probability_density_function_h
#define _aspect_particle_generator_probability_density_function_h

#include <aspect/particle/generator/interface.h>

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

namespace aspect
{
  namespace Particle
  {
    namespace Generator
    {
      template <int dim>
      DeclException1 (ProbabilityFunctionNegative,
                      Point<dim>,
                      << "Your probability density function in the particle generator "
                      "returned a negative probability density for the following position: "
                      << arg1 << ". Please check your function expression.");


      template <int dim>
      class ProbabilityDensityFunction : public Interface<dim>
      {
        public:
          void
          generate_particles(Particles::ParticleHandler<dim> &particle_handler) override;

          static
          void
          declare_parameters (ParameterHandler &prm);

          void
          parse_parameters (ParameterHandler &prm) override;

        private:
          types::particle_index n_particles;

          bool random_cell_selection;

          unsigned int random_number_seed;

          Functions::ParsedFunction<dim> function;
      };

    }
  }
}

#endif