TrackerMeasurementFromHits.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) 2022 - 2025 Whitney Armstrong, Sylvester Joosten, Dmitry Romanov, Wouter Deconinck, Shujie Li
 
#pragma once
 
#include <DD4hep/Detector.h>
#include <DDRec/CellIDPositionConverter.h>
#include <algorithms/algorithm.h>
#include <algorithms/geo.h>
#include <edm4eic/Measurement2DCollection.h>
#include <edm4eic/TrackerHitCollection.h>
#include <gsl/pointers>
#include <memory>
#include <string>
#include <string_view>
 
#include "algorithms/interfaces/ActsSvc.h"
#include "algorithms/interfaces/WithPodConfig.h"
#include "algorithms/tracking/ActsGeometryProvider.h"
 
namespace eicrecon {
 
using TrackerMeasurementFromHitsAlgorithm =
    algorithms::Algorithm<algorithms::Input<edm4eic::TrackerHitCollection>,
                          algorithms::Output<edm4eic::Measurement2DCollection>>;
 
class TrackerMeasurementFromHits : public TrackerMeasurementFromHitsAlgorithm,
                                   public WithPodConfig<NoConfig> {
public:
  TrackerMeasurementFromHits(std::string_view name)
      : TrackerMeasurementFromHitsAlgorithm{name,
                                            {"inputTrackerHits"},
                                            {"outputMeasurements"},
                                            "convert tracker hits to measurements."} {}
 
  void init() final;
  void process(const Input&, const Output&) const final;
 
private:
  const algorithms::GeoSvc& m_geo{algorithms::GeoSvc::instance()};
  const dd4hep::Detector* m_dd4hepGeo{m_geo.detector()};
  const dd4hep::rec::CellIDPositionConverter* m_converter{m_geo.cellIDPositionConverter()};
 
  const algorithms::ActsSvc& m_acts{algorithms::ActsSvc::instance()};
  std::shared_ptr<const ActsGeometryProvider> m_acts_context{m_acts.acts_geometry_provider()};
 
  unsigned long m_detid_b0tracker;
  // Special case of "OuterMPGDBarrel" with UV segmentation
  bool m_outermpgd_UVsegmentation_mode{false};
  unsigned long m_detid_OuterMPGD{0}; // SystemID of "OuterMPGDBarrel"
  double m_gridAngle{0};
};
 
} // namespace eicrecon