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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/HardParticle/Cylinder.cpp
//! @brief Implements class Cylinder.
//!
//! @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/Cylinder.h"
#include "Base/Math/Bessel.h"
#include "Base/Math/Functions.h"
#include "Base/Util/Assert.h"
#include "Sample/Shape/DoubleEllipse.h"
#include <numbers>
using std::numbers::pi;
Cylinder::Cylinder(const std::vector<double> P)
: IFormfactor(P)
, m_radius(m_P[0])
, m_height(m_P[1])
{
validateOrThrow();
}
Cylinder::Cylinder(double radius, double height)
: Cylinder(std::vector<double>{radius, height})
{
}
complex_t Cylinder::formfactor(C3 q) const
{
ASSERT(m_validated);
const double R = m_radius;
const double H = m_height;
const complex_t qH2 = q.z() * H / 2.;
const complex_t qR = std::sqrt(q.x() * q.x() + q.y() * q.y()) * R;
const complex_t axial_part = H * Math::sinc(qH2);
const complex_t radial_part = (2 * pi) * R * R * Math::Bessel::J1c(qR);
return radial_part * axial_part * exp_I(qH2);
}
std::string Cylinder::validate() const
{
std::vector<std::string> errs;
requestGt0(errs, m_radius, "radius");
requestGt0(errs, m_height, "height");
if (!errs.empty())
return jointError(errs);
// TODO improve!
m_shape3D = std::make_unique<DoubleEllipseZ>(m_radius, m_radius, m_height, m_radius, m_radius);
m_validated = true;
return "";
}
bool Cylinder::contains(const R3& position) const
{
double R = radius();
double H = height();
if (std::abs(position.x()) > R || std::abs(position.y()) > R || position.z() < 0
|| position.z() > H)
return false;
if (std::pow(position.x() / R, 2) + std::pow(position.y() / R, 2) <= 1)
return true;
return false;
}
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