Box.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Sample/HardParticle/Box.cpp
//! @brief     Implements class Box.
//!
//! @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/Box.h"
#include "Base/Math/Functions.h"
 
Box::Box(const std::vector<double> P)
    : IFormFactorPrism(P)
    , m_length(m_P[0])
    , m_width(m_P[1])
    , m_height(m_P[2])
{
    checkNodeArgs();
    double a = m_length / 2;
    double b = m_width / 2;
    std::vector<R3> V{{a, b, 0.}, {-a, b, 0.}, {-a, -b, 0.}, {a, -b, 0}};
    setPrism(true, V);
}
 
Box::Box(double length, double width, double height)
    : Box(std::vector<double>{length, width, height})
{
}
 
complex_t Box::formfactor_at_bottom(C3 q) const
{
    complex_t qzHdiv2 = m_height / 2 * q.z();
    return m_length * m_width * m_height * Math::sinc(m_length / 2 * q.x())
           * Math::sinc(m_width / 2 * q.y()) * Math::sinc(qzHdiv2) * exp_I(qzHdiv2);
}