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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/HardParticle/EllipsoidalCylinder.cpp
//! @brief Implements class EllipsoidalCylinder.
//!
//! @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/EllipsoidalCylinder.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;
EllipsoidalCylinder::EllipsoidalCylinder(const std::vector<double> P)
: IFormfactor(P)
, m_radius_x(m_P[0])
, m_radius_y(m_P[1])
, m_height(m_P[2])
{
validateOrThrow();
}
EllipsoidalCylinder::EllipsoidalCylinder(double radius_x, double radius_y, double height)
: EllipsoidalCylinder(std::vector<double>{radius_x, radius_y, height})
{
}
double EllipsoidalCylinder::radialExtension() const
{
ASSERT(m_validated);
return (m_radius_x + m_radius_y) / 2.0;
}
complex_t EllipsoidalCylinder::formfactor(C3 q) const
{
ASSERT(m_validated);
complex_t qxRa = q.x() * m_radius_x;
complex_t qyRb = q.y() * m_radius_y;
complex_t qzHdiv2 = m_height / 2 * q.z();
complex_t Fz = exp_I(qzHdiv2) * Math::sinc(qzHdiv2);
complex_t gamma = std::sqrt((qxRa) * (qxRa) + (qyRb) * (qyRb));
complex_t J1_gamma_div_gamma = Math::Bessel::J1c(gamma);
return (2 * pi) * m_radius_x * m_radius_y * m_height * Fz * J1_gamma_div_gamma;
}
std::string EllipsoidalCylinder::validate() const
{
std::vector<std::string> errs;
requestGt0(errs, m_radius_x, "radius_x");
requestGt0(errs, m_radius_y, "radius_y");
requestGt0(errs, m_height, "height");
if (!errs.empty())
return jointError(errs);
m_shape3D =
std::make_unique<DoubleEllipseZ>(m_radius_x, m_radius_y, m_height, m_radius_x, m_radius_y);
m_validated = true;
return "";
}
bool EllipsoidalCylinder::contains(const R3& position) const
{
double a = radiusX(); // semi-axis length along x
double b = radiusY(); // semi-axis length along y
double H = height();
if (std::abs(position.x()) > a || std::abs(position.y()) > b || position.z() < 0
|| position.z() > H)
return false;
if (std::pow(position.x() / a, 2) + std::pow(position.y() / b, 2) <= 1)
return true;
return false;
}
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