G4ParticleChangeForTransport.cc

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//
// G4ParticleChangeForTransport class implementation
//
// Author: Hisaya Kurashige, 10 May 1998
// --------------------------------------------------------------------
 
#include "G4ParticleChangeForTransport.hh"
#include "G4TouchableHandle.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4TrackFastVector.hh"
#include "G4DynamicParticle.hh"
 
// --------------------------------------------------------------------
G4ParticleChangeForTransport::G4ParticleChangeForTransport()
  : G4ParticleChange()
{
}
 
// --------------------------------------------------------------------
G4ParticleChangeForTransport::~G4ParticleChangeForTransport()
{
}
 
// --------------------------------------------------------------------
G4ParticleChangeForTransport::
G4ParticleChangeForTransport(const G4ParticleChangeForTransport& r)
  : G4ParticleChange(r)
{
  theTouchableHandle          = r.theTouchableHandle;
  isMomentumChanged           = r.isMomentumChanged;
  theMaterialChange           = r.theMaterialChange;
  theMaterialCutsCoupleChange = r.theMaterialCutsCoupleChange;
  theSensitiveDetectorChange  = r.theSensitiveDetectorChange;
}
 
// --------------------------------------------------------------------
G4ParticleChangeForTransport&
G4ParticleChangeForTransport::operator=(const G4ParticleChangeForTransport& r)
{
  if(this != &r)
  {
    theListOfSecondaries          = r.theListOfSecondaries;
    theSizeOftheListOfSecondaries = r.theSizeOftheListOfSecondaries;
    theNumberOfSecondaries        = r.theNumberOfSecondaries;
    theStatusChange               = r.theStatusChange;
    theTouchableHandle            = r.theTouchableHandle;
    theMaterialChange             = r.theMaterialChange;
    theMaterialCutsCoupleChange   = r.theMaterialCutsCoupleChange;
    theSensitiveDetectorChange    = r.theSensitiveDetectorChange;
    theMomentumDirectionChange    = r.theMomentumDirectionChange;
    thePolarizationChange         = r.thePolarizationChange;
    thePositionChange             = r.thePositionChange;
    theTimeChange                 = r.theTimeChange;
    theEnergyChange               = r.theEnergyChange;
    theVelocityChange             = r.theVelocityChange;
    theTrueStepLength             = r.theTrueStepLength;
    theLocalEnergyDeposit         = r.theLocalEnergyDeposit;
    theSteppingControlFlag        = r.theSteppingControlFlag;
  }
  return *this;
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForTransport::UpdateStepForAtRest(G4Step* pStep)
{
  // Update the G4Step specific attributes
  return UpdateStepInfo(pStep);
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForTransport::UpdateStepForAlongStep(G4Step* pStep)
{
  // Smooth curved tajectory representation: let the Step know about
  // the auxiliary trajectory points (jacek 30/10/2002)
  pStep->SetPointerToVectorOfAuxiliaryPoints(fpVectorOfAuxiliaryPointsPointer);
 
  // copy of G4ParticleChange::UpdateStepForAlongStep
  // i.e. no effect for touchable
 
  // A physics process always calculates the final state of the
  // particle relative to the initial state at the beginning
  // of the Step, i.e., based on information of G4Track (or
  // equivalently the PreStepPoint).
  // So, the differences (delta) between these two states have to be
  // calculated and be accumulated in PostStepPoint.
 
  // Take note that the return type of GetMomentumChange is a
  // pointer to G4ThreeVector. Also it is a normalized
  // momentum vector.
 
  G4StepPoint* pPreStepPoint  = pStep->GetPreStepPoint();
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();
  G4Track* aTrack             = pStep->GetTrack();
  G4double mass               = aTrack->GetDynamicParticle()->GetMass();
 
  // update kinetic energy
  // now assume that no energy change in transportation
  // However it is not true in electric fields
  // Case for changing energy will be implemented in future
 
  // update momentum direction and energy
  if(isMomentumChanged)
  {
    G4double energy;
    energy = pPostStepPoint->GetKineticEnergy() +
             (theEnergyChange - pPreStepPoint->GetKineticEnergy());
 
    // calculate new momentum
    G4ThreeVector pMomentum =
      pPostStepPoint->GetMomentum() +
      (CalcMomentum(theEnergyChange, theMomentumDirectionChange, mass) -
       pPreStepPoint->GetMomentum());
    G4double tMomentum = pMomentum.mag();
    G4ThreeVector direction(1.0, 0.0, 0.0);
    if(tMomentum > 0.)
    {
      G4double inv_Momentum = 1.0 / tMomentum;
      direction             = pMomentum * inv_Momentum;
    }
    pPostStepPoint->SetMomentumDirection(direction);
    pPostStepPoint->SetKineticEnergy(energy);
  }
  if(isVelocityChanged)
    pPostStepPoint->SetVelocity(theVelocityChange);
 
  // stop case should not occur
  // pPostStepPoint->SetMomentumDirection(G4ThreeVector(1., 0., 0.));
 
  // update polarization
  pPostStepPoint->AddPolarization(thePolarizationChange -
                                  pPreStepPoint->GetPolarization());
 
  // update position and time
  pPostStepPoint->AddPosition(thePositionChange - pPreStepPoint->GetPosition());
  pPostStepPoint->AddGlobalTime(theTimeChange - pPreStepPoint->GetLocalTime());
  pPostStepPoint->AddLocalTime(theTimeChange - pPreStepPoint->GetLocalTime());
  pPostStepPoint->AddProperTime(theProperTimeChange -
                                pPreStepPoint->GetProperTime());
 
#ifdef G4VERBOSE
  if(debugFlag) { CheckIt(*aTrack); }
#endif
 
  // Update the G4Step specific attributes
  // pStep->SetStepLength( theTrueStepLength );
  // pStep->AddTotalEnergyDeposit( theLocalEnergyDeposit );
  pStep->SetControlFlag(theSteppingControlFlag);
 
  return pStep;
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForTransport::UpdateStepForPostStep(G4Step* pStep)
{
  // A physics process always calculates the final state of the particle
 
  // Change volume only if some kinetic energy remains
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();
  if(pPostStepPoint->GetKineticEnergy() > 0.0)
  {
    // update next touchable
    // (touchable can be changed only at PostStepDoIt)
    pPostStepPoint->SetTouchableHandle(theTouchableHandle);
 
    pPostStepPoint->SetMaterial(theMaterialChange);
    pPostStepPoint->SetMaterialCutsCouple(theMaterialCutsCoupleChange);
    pPostStepPoint->SetSensitiveDetector(theSensitiveDetectorChange);
  }
  if(this->GetFirstStepInVolume())
  {
    pStep->SetFirstStepFlag();
  }
  else
  {
    pStep->ClearFirstStepFlag();
  }
  if(this->GetLastStepInVolume())
  {
    pStep->SetLastStepFlag();
  }
  else
  {
    pStep->ClearLastStepFlag();
  }
  // It used to call base class's method
  //   - but this would copy uninitialised data members
  // return G4ParticleChange::UpdateStepForPostStep(pStep);
 
  // Copying what the base class does would instead
  //   - also not useful
  // return G4VParticleChange::UpdateStepInfo(pStep);
 
  return pStep;
}
 
// --------------------------------------------------------------------
void G4ParticleChangeForTransport::DumpInfo() const
{
  // use base-class DumpInfo
  G4ParticleChange::DumpInfo();
 
  G4int oldprc = G4cout.precision(3);
  G4cout << "        Touchable (pointer) : " << std::setw(20)
         << theTouchableHandle() << G4endl;
  G4cout.precision(oldprc);
}