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File indexing completed on 2025-10-13 08:15:57
0001 // This file is part of the ACTS project. 0002 // 0003 // Copyright (C) 2016 CERN for the benefit of the ACTS project 0004 // 0005 // This Source Code Form is subject to the terms of the Mozilla Public 0006 // License, v. 2.0. If a copy of the MPL was not distributed with this 0007 // file, You can obtain one at https://mozilla.org/MPL/2.0/. 0008 0009 #pragma once 0010 0011 #include "Acts/Definitions/Algebra.hpp" 0012 #include "Acts/Definitions/Units.hpp" 0013 #include "Acts/Utilities/Result.hpp" 0014 0015 namespace Acts { 0016 0017 class GeometryContext; 0018 class Surface; 0019 0020 namespace StripSpacePointBuilder { 0021 0022 /// @brief Collection of cluster pairing options 0023 struct ClusterPairingOptions final { 0024 /// vertex position 0025 Vector3 vertex = Vector3::Zero(); 0026 /// Accepted distance between two clusters 0027 double maxDistance = 100 * UnitConstants::mm; 0028 /// Accepted absolute difference in theta for two clusters 0029 double maxAngleTheta = 1 * UnitConstants::rad; 0030 /// Accepted absolute difference in phi for two clusters 0031 double maxAnglePhi = 1 * UnitConstants::rad; 0032 }; 0033 0034 /// @brief Collection of cosmic space point options 0035 struct CosmicOptions final { 0036 /// Numerical tolerance for the calculation 0037 double tolerance = 1e-6; 0038 }; 0039 0040 /// @brief Collection of constrained space point options 0041 struct ConstrainedOptions final { 0042 /// Position of the vertex 0043 Vector3 vertex = Vector3::Zero(); 0044 /// Tolerance scaling factor on the strip detector element length 0045 double stripLengthTolerance = 0.01; 0046 /// Tolerance scaling factor of the gap between strip detector elements 0047 double stripLengthGapTolerance = 0.01; 0048 }; 0049 0050 /// @brief Strip cluster details 0051 struct StripEnds final { 0052 /// Top end of the strip cluster 0053 Vector3 top = Vector3::Zero(); 0054 /// Bottom end of the strip cluster 0055 Vector3 bottom = Vector3::Zero(); 0056 }; 0057 0058 /// @brief Calculates (Delta theta)^2 + (Delta phi)^2 between two measurements 0059 /// 0060 /// @param globalCluster1 Global position of the measurements on the first strip 0061 /// @param globalCluster2 Global position of the measurements on the second strip 0062 /// @param options Pairing options 0063 /// 0064 /// @return If available, squared sum within configuration parameters 0065 Result<double> computeClusterPairDistance(const Vector3& globalCluster1, 0066 const Vector3& globalCluster2, 0067 const ClusterPairingOptions& options); 0068 0069 /// @param stripEnds1 The ends of first strip 0070 /// @param stripEnds2 The ends of second strip 0071 /// @param options The cosmic options 0072 /// 0073 /// @return If available, the calculated space point 0074 Result<Vector3> computeCosmicSpacePoint(const StripEnds& stripEnds1, 0075 const StripEnds& stripEnds2, 0076 const CosmicOptions& options); 0077 0078 /// @param stripEnds1 The ends of first strip 0079 /// @param stripEnds2 The ends of second strip 0080 /// @param options The constrained options 0081 /// 0082 /// @return If available, the calculated space point 0083 Result<Vector3> computeConstrainedSpacePoint(const StripEnds& stripEnds1, 0084 const StripEnds& stripEnds2, 0085 const ConstrainedOptions& options); 0086 0087 /// @brief Calculate the z and r covariance from the front and back SourceLink in the strip SP formation 0088 /// 0089 /// @param gctx The current geometry context object, e.g. alignment 0090 /// @param surface1 The surface of the first strip 0091 /// @param spacePoint The space point 0092 /// @param localCov1 Local covariance of the first strip 0093 /// @param localCov2 Local covariance of the second strip 0094 /// @param theta The angle between the two strips 0095 /// 0096 /// @return (z, r) components of the global covariance 0097 Vector2 computeVarianceZR(const GeometryContext& gctx, const Surface& surface1, 0098 const Vector3& spacePoint, double localCov1, 0099 double localCov2, double theta); 0100 0101 } // namespace StripSpacePointBuilder 0102 0103 } // namespace Acts
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