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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Aggregate/IInterference.cpp
//! @brief Implements the interface class IInterference.
//!
//! @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 "Sample/Aggregate/IInterference.h"
#include <stdexcept>
IInterference::IInterference(const std::vector<double>& PValues)
: INode(PValues)
{
}
IInterference::IInterference(double position_var)
: m_position_var(position_var)
{
}
// Default implementation of evaluate assumes no inner structure
// It is only to be overriden in case of the presence of such inner structure. See for example
// Interference2DSuperLattice for such a case.
double IInterference::structureFactor(const R3& q, double outer_iff) const
{
return iff_no_inner(q, outer_iff);
}
void IInterference::setPositionVariance(double var)
{
if (var < 0.0)
throw std::runtime_error(
"IInterference::setPositionVariance called with negative argument");
m_position_var = var;
}
double IInterference::DWfactor(R3 q) const
{
// remove z component for two-dimensional interference functions:
if (supportsMultilayer())
q.setZ(0.0);
return std::exp(-q.mag2() * m_position_var);
}
double IInterference::iff_no_inner(const R3& q, double outer_iff) const
{
return DWfactor(q) * (iff_without_dw(q) * outer_iff - 1.0) + 1.0;
}
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