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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/HardParticle/Sphere.cpp
//! @brief Implements class Sphere.
//!
//! @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/Sphere.h"
#include "Base/Type/Span.h"
#include "Base/Util/Assert.h"
#include "Sample/HardParticle/SphericalSegment.h"
#include "Sample/LibFF/SomeFormfactor.h"
#include "Sample/Scattering/Rotations.h"
Sphere::Sphere(const std::vector<double> P, bool position_at_center)
: IFormfactor(P)
, m_radius(m_P[0])
, m_position_at_center(position_at_center)
{
validateOrThrow();
}
Sphere::Sphere(double radius, bool position_at_center)
: Sphere(std::vector<double>{radius}, position_at_center)
{
}
complex_t Sphere::formfactor(C3 q) const
{
ASSERT(m_validated);
complex_t result = SampleUtil::someff::ffSphere(q, m_radius);
if (!m_position_at_center)
result *= exp_I(q.z() * m_radius);
return result;
}
Span Sphere::spanZ(const IRotation* rotation) const
{
if (m_position_at_center)
return {-m_radius, +m_radius};
if (!rotation)
return {0, 2 * m_radius};
R3 centre(0.0, 0.0, m_radius);
R3 new_centre = rotation->transformed(centre);
return {new_centre.z() - m_radius, new_centre.z() + m_radius};
}
std::string Sphere::validate() const
{
if (m_radius <= 0)
return jointError({"nonpositive value of radius=" + std::to_string(m_radius)});
m_validated = true;
return "";
}
bool Sphere::contains(const R3& position) const
{
double R = radius();
if (std::abs(position.x()) > R || std::abs(position.y()) > R || position.z() < 0
|| position.z() > 2 * R)
return false;
if (std::pow(position.x() / R, 2) + std::pow(position.y() / R, 2)
+ std::pow((position.z() - R) / R, 2)
<= 1)
return true;
return false;
}
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