TruthTrack.h

#pragma once
 
#include <TObject.h>
 
#include <vector>
 
namespace ldmx {
 
class TruthTrack {
 public:
  TruthTrack() = default;
 
  virtual ~TruthTrack() = default;
  // TruthTrack(const ldmx::SimParticle &particle);
 
  friend std::ostream& operator<<(std::ostream& o, const TruthTrack& d);
 
  // TruthTrack(const ldmx::SimParticle &particle,
  //           const ldmx::SimTrackerHit &hit) {};
 
  // TruthTrack(const std::vector<double> &pos_vec,
  //           const std::vector<double> &p_vec, int charge){};
 
  /*
    Acts::Vector3 pos_{pos_vec.data()};
    Acts::Vector3 mom{p_vec.data()};
    double time{0.};
 
    // Rotate the position and momentum into the ACTS frame.
    pos_ = tracking::sim::utils::Ldmx2Acts(pos_);
    mom = tracking::sim::utils::Ldmx2Acts(mom);
 
    // Get the charge of the particle.
    // TODO: Add function that uses the PDG ID to calculate this.
    double q{charge * Acts::UnitConstants::e};
 
    // Transform the position, momentum and charge to free parameters.
    auto free_params{tracking::sim::utils::toFreeParameters(pos_, mom, q)};
 
    // Create a line surface at the perigee.  The perigee position is extracted
    // from a particle's vertex or the particle's position at a specific
    // scoring plane.
    auto gen_surface{Acts::Surface::makeShared<Acts::PerigeeSurface>(
        Acts::Vector3(free_params[Acts::eFreePos0],
  free_params[Acts::eFreePos1], free_params[Acts::eFreePos2]))};
 
    // Transform the parameters to local positions on the perigee surface.
    auto bound_params{Acts::detail::transformFreeToBoundParameters(
        free_params, *gen_surface, gctx_)
          .value()};
 
    // Create the seed track object.
    auto seed_track = ldmx::Track();
    seed_track.setPerigeeLocation(free_params[Acts::eFreePos0],
                                  free_params[Acts::eFreePos1],
                                  free_params[Acts::eFreePos2]);
 
 
    seed_track.setPerigeeParameters(
        tracking::sim::utils::convertActsToLdmxPars(bound_params));
 
 
  };
  */
 
  void setTrackID(int trackid) { track_id_ = trackid; };
  int getTrackID() const { return track_id_; };
 
  void setPdgID(int pdgID) { pdg_id_ = pdgID; };
  int getPdgID() const { return pdg_id_; };
 
  void setNhits(int nHits) { n_hits_ = nHits; };
  int getNhits() const { return n_hits_; }
 
  // in units of e
  int q() const { return perigee_pars_[4] > 0 ? 1 : -1; }
 
  // Vector representation
  void setPerigeeParameters(const std::vector<double>& par) {
    perigee_pars_ = par;
  }
  std::vector<double> getPerigeeParameters() const { return perigee_pars_; }
 
  void setPerigeeLocation(const std::vector<double>& perigee) {
    perigee_ = perigee;
  }
 
  void setPerigeeLocation(const double& x_, const double& y_,
                          const double& z_) {
    perigee_[0] = x_;
    perigee_[1] = y_;
    perigee_[2] = z_;
  }
 
  void setMomentum(const double& px, const double& py, const double& pz) {
    momentum_[0] = px;
    momentum_[1] = py;
    momentum_[2] = pz;
  }
 
  void setPosition(const double& x_, const double& y_, const double& z_) {
    position_[0] = x_;
    position_[1] = y_;
    position_[2] = z_;
  }
 
  std::vector<double> getPerigeeLocation() const { return perigee_; };
  double getPerigeeX() const { return perigee_[0]; };
  double getPerigeeY() const { return perigee_[1]; };
  double getPerigeeZ() const { return perigee_[2]; };
 
  std::vector<double> getMomentum() const { return momentum_; };
  std::vector<double> getPosition() const { return position_; };
 
  // getters -- TODO use an enum instead
 
  double getD0() const { return perigee_pars_[0]; };
  double getZ0() const { return perigee_pars_[1]; };
  double getPhi() const { return perigee_pars_[2]; };
  double getTheta() const { return perigee_pars_[3]; };
  double getQoP() const { return perigee_pars_[4]; };
  double getT() const { return perigee_pars_[5]; };
 
  friend std::ostream& operator<<(std::ostream& output, const TruthTrack& trk);
 
 private:
  // 6 elements
  // d0 / z0 / phi / theta / qop / t
  std::vector<double> perigee_pars_{0., 0., 0., 0., 0., 0.};
 
  // The perigee location
  std::vector<double> perigee_{0., 0., 0.};
 
  // The 3-momentum at the perigee
  std::vector<double> momentum_{0., 0., 0.};
 
  // The 3-position at the perigee
  std::vector<double> position_{0., 0., 0.};
 
  // N hits_
  int n_hits_{0};
 
  // ID of the matched particle in the SimParticles map
  int track_id_{-1};
 
  // pdgID
  int pdg_id_{0};
 
  ClassDef(TruthTrack, 3);
 
};  // TruthTrack
 
}  // namespace ldmx