ParticleLayoutContribution.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Sim/Contrib/ParticleLayoutContribution.cpp
//! @brief     Implements class ParticleLayoutContribution.
//!
//! @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)
//
//  ************************************************************************************************
 
#include "Sim/Contrib/ParticleLayoutContribution.h"
#include "Resample/Element/DiffuseElement.h"
#include "Resample/Interparticle/DecouplingApproximationStrategy.h"
#include "Resample/Interparticle/SSCAStrategy.h"
#include "Resample/Processed/ReLayout.h"
#include "Sample/Aggregate/InterferenceRadialParaCrystal.h"
 
namespace {
 
std::unique_ptr<IInterparticleStrategy> processedInterference(const reLayout& re_layout,
                                                              const SimulationOptions& sim_params,
                                                              bool polarized)
{
    const IInterference* iff = re_layout.interferenceFunction();
 
    const std::vector<std::unique_ptr<const CoherentFFSum>>& weighted_formfactors =
        re_layout.formfactorList();
 
    const auto* radial_para = dynamic_cast<const InterferenceRadialParaCrystal*>(iff);
    if (radial_para)
        if (double kappa = radial_para->kappa(); kappa > 0.0)
            return std::make_unique<SSCAStrategy>(weighted_formfactors, radial_para, sim_params,
                                                  polarized, kappa);
 
    return std::make_unique<DecouplingApproximationStrategy>(weighted_formfactors, iff, sim_params,
                                                             polarized);
}
 
} // namespace
 
 
ParticleLayoutContribution::ParticleLayoutContribution(const reLayout& layout,
                                                       const SimulationOptions& options,
                                                       bool polarized)
    : m_layout(layout)
    , m_interparticle_strategy(processedInterference(layout, options, polarized))
{
}
 
ParticleLayoutContribution::~ParticleLayoutContribution() = default;
 
void ParticleLayoutContribution::compute(DiffuseElement& ele) const
{
    ele.addIntensity(m_interparticle_strategy->evaluate(ele) * m_layout.surfaceDensity());
}