FootprintSquare.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Device/Beam/FootprintSquare.cpp
//! @brief     Implements class FootprintSquare.
//!
//! @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 "Device/Beam/FootprintSquare.h"
#include "Base/Math/Constants.h"
#include <algorithm>
#include <cmath>
#include <stdexcept>
 
FootprintSquare::FootprintSquare(const std::vector<double> P)
    : IFootprintFactor(P)
{
    checkNodeArgs();
}
 
FootprintSquare::FootprintSquare(double width_ratio)
    : FootprintSquare(std::vector<double>{width_ratio})
{
}
 
FootprintSquare* FootprintSquare::clone() const
{
    return new FootprintSquare(m_width_ratio);
}
 
double FootprintSquare::calculate(double alpha) const
{
    if (alpha < 0.0 || alpha > M_PI_2)
        return 0.0;
    if (widthRatio() == 0.0)
        return 1.0;
    const double arg = std::sin(alpha) / widthRatio();
    return std::min(arg, 1.0);
}
 
static_assert(!std::is_copy_constructible<FootprintSquare>::value,
              "FootprintSquare should not be copy constructable");
static_assert(!std::is_copy_assignable<FootprintSquare>::value,
              "FootprintSquare should not be copy assignable");