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/* Copyright 2023 The WarpX Community
*
* This file is part of WarpX.
*
* Authors: Juliette Pech, Axel Huebl
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_DIAGNOSTICS_REDUCEDDIAGS_PARTICLEHISTOGRAM2D_H_
#define WARPX_DIAGNOSTICS_REDUCEDDIAGS_PARTICLEHISTOGRAM2D_H_
#include "ReducedDiags.H"
#include <AMReX_Parser.H>
#include <AMReX_REAL.H>
#include <AMReX_TableData.H>
#include <memory>
#include <string>
/**
* Reduced diagnostics that computes a histogram over particles
* for a quantity specified by the user in the input file using the parser.
*/
class ParticleHistogram2D : public ReducedDiags
{
public:
/**
* constructor
* @param[in] rd_name reduced diags names
*/
ParticleHistogram2D(std::string rd_name);
/// File type
std::string m_openpmd_backend {"default"};
/// number of bins on the abscissa and ordinate
int m_bin_num_abs;
int m_bin_num_ord;
/// output data
amrex::TableData<amrex::Real,2> m_h_data_2D;
/// selected species index
int m_selected_species_id = -1;
/// max and min bin values
amrex::Real m_bin_max_abs;
amrex::Real m_bin_min_abs;
amrex::Real m_bin_max_ord;
amrex::Real m_bin_min_ord;
/// bin sizes
amrex::Real m_bin_size_abs;
amrex::Real m_bin_size_ord;
/// functions
std::string function_string_abs;
std::string function_string_ord;
std::string filter_string;
std::string value_string;
/// Parser to read expression for particle quantity from the input file.
/// 7 elements are t, x, y, z, ux, uy, uz, w
static constexpr int m_nvars = 8;
std::unique_ptr<amrex::Parser> m_parser_abs;
std::unique_ptr<amrex::Parser> m_parser_ord;
/// Optional parser to filter particles before doing the histogram
std::unique_ptr<amrex::Parser> m_parser_filter;
/// Whether the filter is activated
bool m_do_parser_filter = false;
/// Optional parser to filter particles before doing the histogram
std::unique_ptr<amrex::Parser> m_parser_value;
/// Whether the filter is activated
bool m_do_parser_value;
/**
* This function computes a histogram of user defined quantity.
*
* @param[in] step current time step
*/
void ComputeDiags(int step) override final;
/**
* write to file function
*
* @param[in] step current time step
*/
void WriteToFile (int step) const override final;
};
#endif
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