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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Aggregate/IInterference.h
//! @brief Defines and 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)
//
// ************************************************************************************************
#ifndef BORNAGAIN_SAMPLE_AGGREGATE_IINTERFERENCE_H
#define BORNAGAIN_SAMPLE_AGGREGATE_IINTERFERENCE_H
#include "Base/Type/ICloneable.h"
#include "Param/Node/INode.h"
#include <heinz/Vectors3D.h>
//! Abstract base class of interference functions.
class IInterference : public ICloneable, public INode {
protected:
IInterference(const std::vector<double>& PValues);
IInterference(double position_var);
public:
#ifndef SWIG
IInterference* clone() const override = 0;
#endif // SWIG
//! The interference function for a given wavevector transfer
virtual double structureFactor(const R3& q, double outer_iff = 1.0) const;
//! Sets the variance of the position for the calculation of the DW factor
//! It is defined as the variance in each relevant dimension
void setPositionVariance(double var);
//! Returns the position variance
double positionVariance() const { return m_position_var; }
//! If defined by this interference function's parameters, returns the particle density (per
//! area). Otherwise, returns zero or a user-defined value
virtual double particleDensity() const { return 0.0; }
//! Indicates if this interference function can be used with a sample (DWBA mode)
virtual bool supportsMultilayer() const { return true; }
//! structureFactors the Debye-Waller factor for a given wavevector transfer
double DWfactor(R3 q) const;
protected:
double m_position_var;
//! Calculates the structure factor in the absence of extra inner structure
double iff_no_inner(const R3& q, double outer_iff) const;
//! Calculates the structure factor without Debye-Waller factor
virtual double iff_without_dw(const R3& q) const = 0;
};
#endif // BORNAGAIN_SAMPLE_AGGREGATE_IINTERFERENCE_H
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