Digitization/src/DigitizationCoordinatesConverter.cpp

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 #include "ActsExamples/Digitization/DigitizationCoordinatesConverter.hpp"
0010
0011 #include "Acts/Definitions/Algebra.hpp"
0012 #include "Acts/Geometry/GeometryContext.hpp"
0013 #include "ActsExamples/Digitization/DigitizationAlgorithm.hpp"
0014
0015 #include <stdexcept>
0016 #include <utility>
0017
0018 namespace ActsExamples {
0019
0020 DigitizationCoordinatesConverter::DigitizationCoordinatesConverter(
0021     DigitizationAlgorithm::Config config)
0022     : m_cfg(std::move(config)) {
0023   if (m_cfg.surfaceByIdentifier.empty()) {
0024     throw std::invalid_argument("Missing Surface-GeometryID association map");
0025   }
0026 }
0027
0028 std::tuple<double, double> DigitizationCoordinatesConverter::globalToLocal(
0029     std::uint64_t moduleId, double x, double y, double z) const {
0030   const Acts::GeometryIdentifier moduleGeoId = moduleId;
0031   auto surfaceItr = m_cfg.surfaceByIdentifier.find(moduleGeoId);
0032   if (surfaceItr == m_cfg.surfaceByIdentifier.end()) {
0033     throw std::runtime_error("Surface not found for moduleGeoId");
0034   }
0035
0036   // Transform the position into the local surface frame
0037   const Acts::Surface* surfacePtr = surfaceItr->second;
0038   const auto& invTransform =
0039       surfacePtr->transform(Acts::GeometryContext()).inverse();
0040
0041   const Acts::Vector3 pos(x, y, z);
0042   Acts::Vector2 pos2Local = (invTransform * pos).segment<2>(0);
0043
0044   return {pos2Local.x(), pos2Local.y()};
0045 }
0046
0047 std::tuple<double, double, double>
0048 DigitizationCoordinatesConverter::localToGlobal(std::uint64_t moduleId,
0049                                                 double x, double y) const {
0050   const Acts::GeometryIdentifier moduleGeoId = moduleId;
0051   auto surfaceItr = m_cfg.surfaceByIdentifier.find(moduleGeoId);
0052   if (surfaceItr == m_cfg.surfaceByIdentifier.end()) {
0053     throw std::runtime_error("Surface not found for moduleGeoId");
0054   }
0055
0056   // Transform the position into the global frame
0057   const Acts::Surface* surfacePtr = surfaceItr->second;
0058   const auto& transform = surfacePtr->transform(Acts::GeometryContext());
0059
0060   const Acts::Vector3 pos(x, y, 0);
0061   Acts::Vector3 pos2Global = (transform * pos);
0062
0063   return {pos2Global.x(), pos2Global.y(), pos2Global.z()};
0064 }
0065
0066 }  // namespace ActsExamples