FormFactorDecoratorPositionFactor.h

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// ************************************************************************** //
//
//  BornAgain: simulate and fit scattering at grazing incidence
//
//! @file      Sample/Scattering/FormFactorDecoratorPositionFactor.h
//! @brief     Defines class FormFactorDecoratorPositionFactor.
//!
//! @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_CORE_SCATTERING_FORMFACTORDECORATORPOSITIONFACTOR_H
#define BORNAGAIN_CORE_SCATTERING_FORMFACTORDECORATORPOSITIONFACTOR_H
 
#include "Sample/Scattering/IFormFactorDecorator.h"
 
//! Decorates a form factor with a position dependent phase factor.
//! @ingroup formfactors_internal
 
class FormFactorDecoratorPositionFactor : public IFormFactorDecorator
{
public:
    FormFactorDecoratorPositionFactor(const IFormFactor& form_factor, const kvector_t& position);
 
    FormFactorDecoratorPositionFactor* clone() const override final
    {
        return new FormFactorDecoratorPositionFactor(*mp_form_factor, m_position);
    }
 
    void accept(INodeVisitor* visitor) const override final { visitor->visit(this); }
 
    double bottomZ(const IRotation& rotation) const override final;
 
    double topZ(const IRotation& rotation) const override final;
 
    complex_t evaluate(const WavevectorInfo& wavevectors) const override final;
#ifndef SWIG
    Eigen::Matrix2cd evaluatePol(const WavevectorInfo& wavevectors) const override final;
#endif
 
private:
    complex_t getPositionFactor(const WavevectorInfo& wavevectors) const;
 
    kvector_t m_position;
};
 
#endif // BORNAGAIN_CORE_SCATTERING_FORMFACTORDECORATORPOSITIONFACTOR_H