PolynomialMatrixReconstruction.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) 2025 Alex Jentsch
//
 
#pragma once
 
#include <DD4hep/Detector.h>
#include <DDRec/CellIDPositionConverter.h>
#include <algorithms/algorithm.h>
#include <algorithms/geo.h>
#include <edm4eic/ReconstructedParticleCollection.h>
#include <edm4eic/TrackerHitCollection.h>
#include <edm4hep/MCParticleCollection.h>
#include <gsl/pointers>
#include <string>
#include <string_view>
 
#include "PolynomialMatrixReconstructionConfig.h"
#include "algorithms/interfaces/WithPodConfig.h"
 
namespace eicrecon {
 
using PolynomialMatrixReconstructionAlgorithm = algorithms::Algorithm<
    algorithms::Input<edm4hep::MCParticleCollection, edm4eic::TrackerHitCollection>,
    algorithms::Output<edm4eic::ReconstructedParticleCollection>>;
 
class PolynomialMatrixReconstruction : public PolynomialMatrixReconstructionAlgorithm,
                                       public WithPodConfig<PolynomialMatrixReconstructionConfig> {
 
public:
  PolynomialMatrixReconstruction(std::string_view name)
      : PolynomialMatrixReconstructionAlgorithm{
            name,
            {"mcParticles", "inputHitCollection"},
            {"outputParticleCollection"},
            "Apply polynomial matrix method reconstruction to hits."} {}
 
  void init() final;
  void process(const Input&, const Output&) const final;
 
private:
  const dd4hep::Detector* m_detector{algorithms::GeoSvc::instance().detector()};
  const dd4hep::rec::CellIDPositionConverter* m_converter{
      algorithms::GeoSvc::instance().cellIDPositionConverter()};
  double calculateOffsetFromXL(int whichOffset, double x_L, double beamEnergy) const;
  double calculateMatrixValueFromXL(int whichElement, double x_L, double beamEnergy) const;
};
} // namespace eicrecon