IFormFactorPrism.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Sample/HardParticle/IFormFactorPrism.cpp
//! @brief     Implements interface IFormFactorPrism.
//!
//! @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/HardParticle/IFormFactorPrism.h"
#include "Sample/Particle/PolyhedralUtil.h"
#include <ff/Prism.h>
 
IFormFactorPrism::IFormFactorPrism(const std::vector<double>& PValues)
    : IFormFactor(PValues)
{
}
 
IFormFactorPrism::~IFormFactorPrism() = default;
 
void IFormFactorPrism::setPrism(bool symmetry_Ci, const std::vector<R3>& vertices)
{
    pimpl = std::make_unique<ff::Prism>(symmetry_Ci, height(), vertices);
 
    m_vertices.clear();
    for (const R3& vertex : vertices) {
        m_vertices.push_back(vertex);
        m_vertices.push_back(vertex + R3{0, 0, height()});
    }
}
 
double IFormFactorPrism::bottomZ(const IRotation* rotation) const
{
    return PolyhedralUtil::BottomZ(m_vertices, rotation);
}
 
double IFormFactorPrism::topZ(const IRotation* rotation) const
{
    return PolyhedralUtil::TopZ(m_vertices, rotation);
}
 
//! Returns the volume of this prism.
double IFormFactorPrism::volume() const
{
    return height() * pimpl->area();
}
 
double IFormFactorPrism::radialExtension() const
{
    return std::sqrt(pimpl->area());
}
 
//! Returns the form factor F(q) of this polyhedron, respecting the offset height/2.
 
complex_t IFormFactorPrism::formfactor_at_bottom(C3 q) const
{
    return exp_I(height() / 2 * q.z()) * pimpl->formfactor(q);
}