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0001 // This file is part of the Acts project. 0002 // 0003 // Copyright (C) 2023 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 http://mozilla.org/MPL/2.0/. 0008 0009 #pragma once 0010 0011 #include "Acts/Definitions/Algebra.hpp" 0012 #include "Acts/Geometry/GeometryContext.hpp" 0013 #include "Acts/Geometry/Polyhedron.hpp" 0014 #include "Acts/Surfaces/Surface.hpp" 0015 #include "Acts/Utilities/BinningData.hpp" 0016 0017 #include <vector> 0018 0019 namespace Acts::Experimental::detail { 0020 0021 /// A struct to access the center position 0022 /// 0023 /// This generator will provide only one filling point and hence 0024 /// only a single bin in the indexed grid. 0025 struct CenterReferenceGenerator { 0026 /// Helper to access the Center point of for filling the grid 0027 /// 0028 /// @param gctx the geometry context of this operation 0029 /// @param surface the surface for which the reference point is to be accessed 0030 /// 0031 /// @return a vector of reference points for filling 0032 const std::vector<Vector3> references(const GeometryContext& gctx, 0033 const Surface& surface) const { 0034 return {surface.center(gctx)}; 0035 } 0036 }; 0037 0038 /// A struct to access reference positions based on bin values 0039 /// 0040 /// @tparam bVAL the binning value to be used for the binning position call 0041 /// 0042 /// This generator will provide only one filling point and hence 0043 /// only a single bin in the indexed grid. 0044 template <BinningValue bVAL = BinningValue::binValues> 0045 struct BinningValueReferenceGenerator { 0046 /// Helper to access a reference position based on binning value 0047 /// 0048 /// @param gctx the geometry context of this operation 0049 /// @param surface the surface for which the reference point is to be accessed 0050 /// 0051 /// @return a vector of reference points for filling 0052 const std::vector<Vector3> references(const GeometryContext& gctx, 0053 const Surface& surface) const { 0054 return {surface.binningPosition(gctx, bVAL)}; 0055 } 0056 }; 0057 0058 /// A struct to access generated vertices from surface polyhedrons 0059 /// These vertices are then used to find the bin boundary box for the 0060 /// indexed grid. 0061 /// 0062 /// @tparam nSEGS the number of segments to be used for the polyhedron 0063 /// approximation of arcs between vertices 0064 /// @tparam aBARY if true, the barycenter of the polyhedron is added 0065 /// 0066 /// The grid filling then completes the empty bins in between and 0067 /// expands if necessary. 0068 template <std::size_t nSEGS = 1u, bool aBARY = true> 0069 struct PolyhedronReferenceGenerator { 0070 /// Helper to access the Center point of for filling the grid 0071 /// 0072 /// @param gctx the geometry context of this operation 0073 /// @param surface the surface for which the reference point is to be accessed 0074 /// 0075 /// @return a vector of reference points for filling 0076 const std::vector<Vector3> references(const GeometryContext& gctx, 0077 const Surface& surface) const { 0078 // Create the return vector 0079 std::vector<Vector3> rPositions; 0080 auto pHedron = surface.polyhedronRepresentation(gctx, nSEGS); 0081 rPositions.insert(rPositions.end(), pHedron.vertices.begin(), 0082 pHedron.vertices.end()); 0083 // Add the barycenter if configured 0084 if constexpr (aBARY) { 0085 Vector3 bc(0., 0., 0.); 0086 std::for_each(rPositions.begin(), rPositions.end(), 0087 [&](const auto& p) { bc += p; }); 0088 bc *= 1. / rPositions.size(); 0089 rPositions.push_back(bc); 0090 } 0091 return rPositions; 0092 } 0093 }; 0094 0095 } // namespace Acts::Experimental::detail
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