CircularlySymmetricModelComponent.icpp

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/** Copyright © 2019 Université de Genève, LMU Munich - Faculty of Physics, IAP-CNRS/Sorbonne Université
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3.0 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
/** 
 * @file CircularlySymmetricModelComponent.icpp
 * @date September 1, 2015
 * @author Nikolaos Apostolakos
 */
 
#include <utility> // for std::forward
#include <cmath> // for std::sqrt, std::cos, std::sin
#include <tuple> // for std::tie
#include <functional> // for std::ref
 
namespace ModelFitting {
 
template <typename Profile>
template <typename... ProfileParameters>
CircularlySymmetricModelComponent<Profile>::CircularlySymmetricModelComponent(
                                std::unique_ptr<SharpRegionManager> sharp_manager,
                                ProfileParameters&&... proj_parameters)
          : m_sharp_manager{std::move(sharp_manager)},
            m_profile(std::forward<ProfileParameters>(proj_parameters)...) {
}
 
template <typename Profile>
CircularlySymmetricModelComponent<Profile>::~CircularlySymmetricModelComponent() = default;
 
template <typename Profile>
double CircularlySymmetricModelComponent<Profile>::getValue(double x, double y) {
  return m_profile(std::sqrt(x*x + y*y));
}
 
template <typename Profile>
void CircularlySymmetricModelComponent<Profile>::updateRasterizationInfo(
                                                          double scale, double r_max) {
  m_sharp_manager->updateRasterizationInfo(scale, r_max, std::ref(m_profile));
}
 
template <typename Profile>
auto CircularlySymmetricModelComponent<Profile>::getSharpSampling()
                                                    -> std::vector<ModelSample> {
  std::vector<ModelSample> result {};
  double r1 {0.};
  for (double r2=0.; m_sharp_manager->insideSharpRegion(r2); r1=r2) {
    int angle_no {0};
    std::tie(r2, angle_no) = m_sharp_manager->nextRadiusAndAngleNo(r1);
    double r_half = (r1 + r2) / 2.;
    double area = M_PI * (r2*r2 - r1*r1);
    double integral = m_profile(r_half) * area / angle_no;
    double angle_step = 2 * M_PI / angle_no;
    for (double angle=0.; angle_no!=0; --angle_no, angle+=angle_step) {
      double x = r_half * std::cos(angle);
      double y = r_half * std::sin(angle);
      result.emplace_back(x, y, integral);
    }
  }
  return result;
}
 
template <typename Profile>
bool CircularlySymmetricModelComponent<Profile>:: insideSharpRegion(double x, double y) {
  return m_sharp_manager->insideSharpRegion(std::sqrt(x*x + y*y));
}
 
} // end of namespace ModelFitting