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TransformFreeToBoundTests.cpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2020 CERN for the benefit of the Acts project
4 //
5 // This Source Code Form is subject to the terms of the Mozilla Public
6 // License, v. 2.0. If a copy of the MPL was not distributed with this
7 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 
9 #include <boost/test/data/test_case.hpp>
10 #include <boost/test/unit_test.hpp>
11 
12 #include "Acts/EventData/detail/TransformationFreeToBound.hpp"
13 #include "Acts/Tests/CommonHelpers/FloatComparisons.hpp"
14 #include "Acts/Utilities/UnitVectors.hpp"
15 #include "Acts/Utilities/Units.hpp"
16 
17 #include <cmath>
18 #include <limits>
19 
20 #include "TrackParametersDatasets.hpp"
21 
22 using namespace Acts;
23 using namespace Acts::UnitLiterals;
24 
25 namespace {
26 constexpr auto eps = std::numeric_limits<BoundScalar>::epsilon();
27 }
28 
29 BOOST_AUTO_TEST_SUITE(TransformFreeToBound)
30 
31 BOOST_DATA_TEST_CASE(
32  GlobalToBoundTrackParameters,
33  surfaces* posSymmetric* posSymmetric* ts* phis* thetas* ps* qsNonZero,
34  surface, l0, l1, time, phiInput, theta, p, q) {
35  // phi is ill-defined in forward/backward tracks
36  const auto phi = ((0 < theta) and (theta < M_PI)) ? phiInput : 0.0;
37  const auto qOverP = q / p;
38 
39  GeometryContext geoCtx;
40  Vector2D loc(l0, l1);
41  Vector3D dir = makeDirectionUnitFromPhiTheta(phi, theta);
42  // transform reference position
43  Vector3D pos = surface->localToGlobal(geoCtx, loc, dir);
44 
45  // convert free parameters to bound parameters
46  {
47  BOOST_TEST_INFO("Transform free parameters vector onto surface "
48  << surface->name());
49 
50  FreeVector fv = FreeVector::Zero();
51  fv[eFreePos0] = pos[ePos0];
52  fv[eFreePos1] = pos[ePos1];
53  fv[eFreePos2] = pos[ePos2];
54  fv[eFreeTime] = time;
55  fv[eFreeDir0] = dir[eMom0];
56  fv[eFreeDir1] = dir[eMom1];
57  fv[eFreeDir2] = dir[eMom2];
58  fv[eFreeQOverP] = qOverP;
59  BoundVector bv =
60  detail::transformFreeToBoundParameters(fv, *surface, geoCtx);
61  CHECK_CLOSE_OR_SMALL(bv[eBoundLoc0], l0, eps, eps);
62  CHECK_CLOSE_OR_SMALL(bv[eBoundLoc1], l1, eps, eps);
63  CHECK_CLOSE_OR_SMALL(bv[eBoundTime], time, eps, eps);
64  CHECK_CLOSE_OR_SMALL(bv[eBoundPhi], phi, eps, eps);
65  CHECK_CLOSE_OR_SMALL(bv[eBoundTheta], theta, eps, eps);
66  CHECK_CLOSE_OR_SMALL(bv[eBoundQOverP], qOverP, eps, eps);
67  }
68  // convert separate components to bound parameters
69  {
70  BOOST_TEST_INFO("Transform free parameters components onto surface "
71  << surface->name());
72 
73  BoundVector bv = detail::transformFreeToBoundParameters(
74  pos, time, dir, qOverP, *surface, geoCtx);
75  CHECK_CLOSE_OR_SMALL(bv[eBoundLoc0], l0, eps, eps);
76  CHECK_CLOSE_OR_SMALL(bv[eBoundLoc1], l1, eps, eps);
77  CHECK_CLOSE_OR_SMALL(bv[eBoundTime], time, eps, eps);
78  CHECK_CLOSE_OR_SMALL(bv[eBoundPhi], phi, eps, eps);
79  CHECK_CLOSE_OR_SMALL(bv[eBoundTheta], theta, eps, eps);
80  CHECK_CLOSE_OR_SMALL(bv[eBoundQOverP], qOverP, eps, eps);
81  }
82 }
83 
84 BOOST_DATA_TEST_CASE(GlobalToCurvilinearParameters,
85  ts* phis* thetas* ps* qsNonZero, time, phiInput, theta, p,
86  q) {
87  // phi is ill-defined in forward/backward tracks
88  const auto phi = ((0 < theta) and (theta < M_PI)) ? phiInput : 0.0;
89  const auto qOverP = q / p;
90 
91  GeometryContext geoCtx;
92  Vector3D dir = makeDirectionUnitFromPhiTheta(phi, theta);
93 
94  // convert w/ direction
95  {
96  BoundVector bv =
97  detail::transformFreeToCurvilinearParameters(time, dir, qOverP);
98  CHECK_SMALL(bv[eBoundLoc0], eps);
99  CHECK_SMALL(bv[eBoundLoc1], eps);
100  CHECK_CLOSE_OR_SMALL(bv[eBoundTime], time, eps, eps);
101  CHECK_CLOSE_OR_SMALL(bv[eBoundPhi], phi, eps, eps);
102  CHECK_CLOSE_OR_SMALL(bv[eBoundTheta], theta, eps, eps);
103  CHECK_CLOSE_OR_SMALL(bv[eBoundQOverP], qOverP, eps, eps);
104  }
105  // convert w/ angles
106  {
107  BoundVector bv =
108  detail::transformFreeToCurvilinearParameters(time, phi, theta, qOverP);
109  CHECK_SMALL(bv[eBoundLoc0], eps);
110  CHECK_SMALL(bv[eBoundLoc1], eps);
111  CHECK_CLOSE_OR_SMALL(bv[eBoundTime], time, eps, eps);
112  CHECK_CLOSE_OR_SMALL(bv[eBoundPhi], phi, eps, eps);
113  CHECK_CLOSE_OR_SMALL(bv[eBoundTheta], theta, eps, eps);
114  CHECK_CLOSE_OR_SMALL(bv[eBoundQOverP], qOverP, eps, eps);
115  }
116 }
117 
118 BOOST_AUTO_TEST_SUITE_END()