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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Interface/RoughnessMap.h
//! @brief Define RoughnessMap class.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2024
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifndef BORNAGAIN_SAMPLE_MULTILAYER_ROUGHNESSMAP_H
#define BORNAGAIN_SAMPLE_MULTILAYER_ROUGHNESSMAP_H
#include "Base/Math/FourierTransform.h"
#include "Sample/Multilayer/Sample.h"
#include <random>
#ifdef BORNAGAIN_PYTHON
#include "Base/Py/ArrayWrapper.h" // Arrayf64Wrapper
#endif // BORNAGAIN_PYTHON
//! Generation of random rough surface with given both spectrum and height statistics.
//!
//! Algorithm by Pérez-Ràfols & Almqvist, Tribology International 131, 591-604 (2019)
//! https://doi.org/10.1016/j.triboint.2018.11.020
class RoughnessMap {
public:
RoughnessMap(size_t x_points, size_t y_points, double Lx, double Ly, const Sample& sample,
int i_layer, int seed = -1);
RoughnessMap() = delete;
double2d_t generateMap();
#ifdef BORNAGAIN_PYTHON
//! Returns data to construct a Python Numpy array.
Arrayf64Wrapper generate();
#endif // BORNAGAIN_PYTHON
private:
// create random uncorrelated map with given height statistics
double2d_t mapFromHeights() const;
// create random map with gives autocorrelation spectrum
double2d_t mapFromSpectrum() const;
double2d_t applySpectrumToHeights(const double2d_t& h_map, const double2d_t& s_map) const;
double2d_t applyHeightsToSpectrum(const double2d_t& h_map, const double2d_t& s_map) const;
// create random map with both spectrum and height distribution
void createMap();
int m_x_points = 0;
int m_y_points = 0;
double m_lx; //!< sample x size in nm
double m_ly; //!< sample y size in nm
const Sample& m_sample;
int m_i_layer;
double2d_t m_rough_map;
mutable FourierTransform m_ft;
std::random_device m_rd;
mutable std::mt19937 m_gen;
};
#endif // BORNAGAIN_SAMPLE_MULTILAYER_ROUGHNESSMAP_H
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