Geant4Hits.cpp

// $Id$
//====================================================================
//  AIDA Detector description implementation for LCD
//--------------------------------------------------------------------
//
//  Author     : M.Frank
//
//====================================================================

// Framework include files
#include "DDG4/Geant4Hits.h"

// Geant4 include files
#include "G4Allocator.hh"
#include "G4ParticleDefinition.hh"
#include "G4ChargedGeantino.hh"
#include "G4OpticalPhoton.hh"
#include "G4Geantino.hh"

// C/C++ include files
#include <iostream>

using namespace std;
using namespace DD4hep::Simulation;

/// Check if the Geant4 track is a Geantino
bool Geant4Hit::isGeantino(G4Track* track) {
  if (track) {
    G4ParticleDefinition* def = track->GetDefinition();
    if (def == G4ChargedGeantino::Definition())
      return true;
    if (def == G4Geantino::Definition()) {
      return true;
    }
  }
  return false;
}

Geant4Hit::Contribution Geant4Hit::extractContribution(G4Step* step) {
  G4Track* trk = step->GetTrack();
  double energy_deposit =
      (trk->GetDefinition() == G4OpticalPhoton::OpticalPhotonDefinition()) ?
          trk->GetTotalEnergy() : step->GetTotalEnergyDeposit();
  Contribution contrib(trk->GetTrackID(), trk->GetDefinition()->GetPDGEncoding(), energy_deposit, trk->GetGlobalTime());
  return contrib;
}

static G4Allocator<Geant4TrackerHit> TrackerHitAllocator;

/// Default constructor
Geant4TrackerHit::Geant4TrackerHit()
  : Geant4Hit(), position(), momentum(), length(0.0), truth(), energyDeposit(0.0) {
}

/// Standard initializing constructor
Geant4TrackerHit::Geant4TrackerHit(int track_id, int pdg_id, double deposit, double time_stamp)
    : Geant4Hit(), position(), momentum(), length(0.0), truth(track_id, pdg_id, deposit, time_stamp), energyDeposit(deposit) {
}

/// Assignment operator
Geant4TrackerHit& Geant4TrackerHit::operator=(const Geant4TrackerHit& c) {
  if ( this != &c )  {
    position = c.position;
    momentum = c.momentum;
    length = c.length;
    truth = c.truth;
    energyDeposit = c.energyDeposit;
  }
  return *this;
}

/// Clear hit content
Geant4TrackerHit& Geant4TrackerHit::clear() {
  position.SetXYZ(0, 0, 0);
  momentum.SetXYZ(0, 0, 0);
  length = 0.0;
  truth.clear();
  energyDeposit = 0.0;
  return *this;
}

/// Store Geant4 point and step information into tracker hit structure.
Geant4TrackerHit& Geant4TrackerHit::storePoint(G4Step* step, G4StepPoint* pnt) {
  G4Track* trk = step->GetTrack();
  G4ThreeVector pos = pnt->GetPosition();
  G4ThreeVector mom = pnt->GetMomentum();

  truth.trackID = trk->GetTrackID();
  truth.pdgID = trk->GetDefinition()->GetPDGEncoding();
  truth.deposit = step->GetTotalEnergyDeposit();
  truth.time = trk->GetGlobalTime();
  energyDeposit = step->GetTotalEnergyDeposit();
  position.SetXYZ(pos.x(), pos.y(), pos.z());
  momentum.SetXYZ(mom.x(), mom.y(), mom.z());
  length = 0;
  return *this;
}

/// Geant4 required object allocator
void* Geant4TrackerHit::operator new(size_t) {
  return TrackerHitAllocator.MallocSingle();
}

/// Geat4 required object destroyer
void Geant4TrackerHit::operator delete(void *p) {
  TrackerHitAllocator.FreeSingle((Geant4TrackerHit*) p);
}

static G4Allocator<Geant4CalorimeterHit> CalorimeterHitAllocator;

/// Standard constructor
Geant4CalorimeterHit::Geant4CalorimeterHit(const Position& pos)
    : Geant4Hit(), position(pos), truth(), energyDeposit(0) {
}

/// Geant4 required object allocator
void* Geant4CalorimeterHit::operator new(size_t) {
  return CalorimeterHitAllocator.MallocSingle();
}

/// Geat4 required object destroyer
void Geant4CalorimeterHit::operator delete(void *p) {
  CalorimeterHitAllocator.FreeSingle((Geant4CalorimeterHit*) p);
}