particle_distribution_statistics.h

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// ------------------------------------------------------
//
// SPDX-License-Identifier: GPL-2.0-or-later
//
// SPDX-FileCopyrightText: Copyright (C) 2025-2026 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_postprocess_particle_distribution_statistics_h
#define _aspect_postprocess_particle_distribution_statistics_h

#include <aspect/particle/distribution.h>
#include <deal.II/base/function_lib.h>
#include <aspect/particle/manager.h>

namespace aspect
{
  namespace Postprocess
  {

    template <int dim>
    class ParticleDistributionStatistics : public Interface<dim>, public ::aspect::SimulatorAccess<dim>
    {
      public:
        void initialize() override;

        std::pair<std::string,std::string>
        execute (TableHandler &statistics) override;

        std::list<std::string>
        required_other_postprocessors() const override;

        static
        void
        declare_parameters (ParameterHandler &prm);

        void
        parse_parameters (ParameterHandler &prm) override;

      private:
        bool KDE_per_particle;

        unsigned int granularity;

        double bandwidth;

        typename Particle::ParticlePDF<dim>::KernelFunction kernel_function;

        std::vector<typename Particles::ParticleHandler<dim>::particle_iterator_range>
        get_neighboring_particle_ranges(const typename Triangulation<dim>::active_cell_iterator &cell,
                                        const typename Particles::ParticleHandler<dim> &particle_handler);

        std::unique_ptr<GridTools::Cache<dim>> grid_cache;
    };
  }
}


#endif