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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Resample/Coherence/CoheringSubparticles.h
//! @brief Defines class CoheringSubparticles.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifdef SWIG
#error no need to expose this header to Swig
#endif // SWIG
#ifndef BORNAGAIN_RESAMPLE_COHERENCE_COHERINGSUBPARTICLES_H
#define BORNAGAIN_RESAMPLE_COHERENCE_COHERINGSUBPARTICLES_H
#include "Base/Type/OwningVector.h"
#include <heinz/Complex.h>
#include <vector>
class DiffuseElement;
class IReParticle;
class SpinMatrix;
struct SubparticlePlacements;
//! A set of particle slices that have fixed positions relative to each other.
//! Accordingly, the collective form factor is computed by coherent superposition.
class CoheringSubparticles {
public:
CoheringSubparticles(double abundance, OwningVector<IReParticle>&& terms);
~CoheringSubparticles();
complex_t summedFF(const DiffuseElement& ele) const;
SpinMatrix summedPolFF(const DiffuseElement& ele) const;
double relativeAbundance() const { return m_abundance; }
double radialExtension() const;
const OwningVector<IReParticle>& terms() const { return m_subparticles; }
private:
//! Leaves only the unique subparticles.
void findUniqueSubparticles();
const double m_abundance;
const OwningVector<IReParticle> m_subparticles;
std::vector<SubparticlePlacements> m_unique_subparticles;
};
#endif // BORNAGAIN_RESAMPLE_COHERENCE_COHERINGSUBPARTICLES_H
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