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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/HardParticle/IFormfactorPolyhedron.cpp
//! @brief Implements interface IFormfactorPolyhedron.
//!
//! @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)
//
// ************************************************************************************************
//! The mathematics implemented here is described in full detail in a paper
//! by Joachim Wuttke, entitled
//! "Form factor (Fourier shape transform) of polygon and polyhedron."
#include "Sample/HardParticle/IFormfactorPolyhedron.h"
#include "Base/Type/Span.h"
#include "Base/Util/Assert.h"
#include "Sample/Particle/PolyhedralUtil.h"
#include <ff/Polyhedron.h>
IFormfactorPolyhedron::IFormfactorPolyhedron(const std::vector<double>& PValues)
: IFormfactor(PValues)
{
}
IFormfactorPolyhedron::~IFormfactorPolyhedron() = default;
//! Called by child classes to set faces and other internal variables.
void IFormfactorPolyhedron::setPolyhedron(const ff::Topology& topology, double z_bottom,
const std::vector<R3>& vertices) const
{
pimpl = std::make_unique<ff::Polyhedron>(topology, vertices, R3(0, 0, -z_bottom));
}
double IFormfactorPolyhedron::volume() const
{
ASSERT(m_validated);
return pimpl->volume();
}
double IFormfactorPolyhedron::radialExtension() const
{
ASSERT(m_validated);
return pimpl->radius();
}
Span IFormfactorPolyhedron::spanZ(const IRotation* rotation) const
{
ASSERT(m_validated);
return PolyhedralUtil::spanZ(pimpl->vertices(), rotation);
}
complex_t IFormfactorPolyhedron::formfactor(C3 q) const
{
ASSERT(m_validated);
return pimpl->formfactor(q);
}
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