SourceXtractorPlusPlus  0.16
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CircularlySymmetricModelComponent.icpp
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1 /** Copyright © 2019 Université de Genève, LMU Munich - Faculty of Physics, IAP-CNRS/Sorbonne Université
2  *
3  * This library is free software; you can redistribute it and/or modify it under
4  * the terms of the GNU Lesser General Public License as published by the Free
5  * Software Foundation; either version 3.0 of the License, or (at your option)
6  * any later version.
7  *
8  * This library is distributed in the hope that it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
10  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
11  * details.
12  *
13  * You should have received a copy of the GNU Lesser General Public License
14  * along with this library; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16  */
17 /**
18  * @file CircularlySymmetricModelComponent.icpp
19  * @date September 1, 2015
20  * @author Nikolaos Apostolakos
21  */
22 
23 #include <utility> // for std::forward
24 #include <cmath> // for std::sqrt, std::cos, std::sin
25 #include <tuple> // for std::tie
26 #include <functional> // for std::ref
27 
28 namespace ModelFitting {
29 
30 template <typename Profile>
31 template <typename... ProfileParameters>
32 CircularlySymmetricModelComponent<Profile>::CircularlySymmetricModelComponent(
33  std::unique_ptr<SharpRegionManager> sharp_manager,
34  ProfileParameters&&... proj_parameters)
35  : m_sharp_manager{std::move(sharp_manager)},
36  m_profile(std::forward<ProfileParameters>(proj_parameters)...) {
37 }
38 
39 template <typename Profile>
40 CircularlySymmetricModelComponent<Profile>::~CircularlySymmetricModelComponent() = default;
41 
42 template <typename Profile>
43 double CircularlySymmetricModelComponent<Profile>::getValue(double x, double y) {
44  return m_profile(std::sqrt(x*x + y*y));
45 }
46 
47 template <typename Profile>
48 void CircularlySymmetricModelComponent<Profile>::updateRasterizationInfo(
49  double scale, double r_max) {
50  m_sharp_manager->updateRasterizationInfo(scale, r_max, std::ref(m_profile));
51 }
52 
53 template <typename Profile>
54 auto CircularlySymmetricModelComponent<Profile>::getSharpSampling()
55  -> std::vector<ModelSample> {
56  std::vector<ModelSample> result {};
57  double r1 {0.};
58  for (double r2=0.; m_sharp_manager->insideSharpRegion(r2); r1=r2) {
59  int angle_no {0};
60  std::tie(r2, angle_no) = m_sharp_manager->nextRadiusAndAngleNo(r1);
61  double r_half = (r1 + r2) / 2.;
62  double area = M_PI * (r2*r2 - r1*r1);
63  double integral = m_profile(r_half) * area / angle_no;
64  double angle_step = 2 * M_PI / angle_no;
65  for (double angle=0.; angle_no!=0; --angle_no, angle+=angle_step) {
66  double x = r_half * std::cos(angle);
67  double y = r_half * std::sin(angle);
68  result.emplace_back(x, y, integral);
69  }
70  }
71  return result;
72 }
73 
74 template <typename Profile>
75 bool CircularlySymmetricModelComponent<Profile>:: insideSharpRegion(double x, double y) {
76  return m_sharp_manager->insideSharpRegion(std::sqrt(x*x + y*y));
77 }
78 
79 } // end of namespace ModelFitting