Gabriele Cosmo
134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: ExN05PiModel.cc,v 1.2 1999/12/15 14:49:31 gunter Exp $
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// GEANT4 tag $Name: geant4-01-01 $
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//
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#include "ExN05PiModel.hh"
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#include "G4PionMinus.hh"
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#include "G4PionPlus.hh"
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#include "G4Gamma.hh"
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ExN05PiModel::ExN05PiModel(G4Envelope *anEnvelope) :
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G4VFastSimulationModel("ExN05PiModel",anEnvelope)
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{;}
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ExN05PiModel::~ExN05PiModel()
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{;}
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G4bool ExN05PiModel::IsApplicable(const G4ParticleDefinition& particleType)
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{
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return
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&particleType == G4PionMinus::PionMinusDefinition() ||
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&particleType == G4PionPlus::PionPlusDefinition();
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}
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G4bool ExN05PiModel::ModelTrigger(const G4FastTrack& fastTrack) {
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//-------------------------------------------------------------
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// UserTrigger() method: method which has to decide if
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// the parameterisation has to be applied.
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// Here ModelTrigger() asks the user (ie you) a 0/1 answer.
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//
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// Note that quantities like the local/global position/direction etc..
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// are available at this level via the fastTrack parameter (allowing
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// to check distance from boundaries, see below to allow the decision)
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//--------------------------------------------------------------
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G4cout << "\nExN05PiModel::ModelTrigger() called:" << G4endl;
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G4cout << "--------------------------------" << G4endl;
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G4cout << "(particle is a " << fastTrack.GetPrimaryTrack()->
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GetDefinition()->GetParticleName() << " )\n" << G4endl;
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// -- Examples of available informations:
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// -- position:
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G4cout << " Track position: " <<
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fastTrack.GetPrimaryTrack()->GetPosition() << "(global coord.)" <<
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fastTrack.GetPrimaryTrackLocalPosition() << "(in envelope coord.)"
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<< G4endl;
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// -- direction:
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G4cout << " Track direction:" <<
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fastTrack.GetPrimaryTrack()->GetMomentum().unit() <<
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"(global coord.)" <<
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fastTrack.GetPrimaryTrackLocalDirection() << "(in envelope coord.)" <<
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G4endl;
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return true;
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}
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void ExN05PiModel::DoIt(const G4FastTrack& fastTrack,
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G4FastStep& fastStep)
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//--------------------------------------------------
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//
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// User method to code the parameterisation properly
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// said.
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//
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//--------------------------------------------------
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{
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//------------------------------------------------
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// The primary track continues along its direction.
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// One secondary (a photon) is added:
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//------------------------------------------------
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G4cout << " Pion `model' applied\n" << G4endl;
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//------------------------------
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// Primary:
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// idem as in "DefaultModel":
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//
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//------------------------------
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G4ThreeVector position;
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G4double distance;
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distance = fastTrack.GetEnvelopeSolid()->
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DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
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fastTrack.GetPrimaryTrackLocalDirection());
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position = fastTrack.GetPrimaryTrackLocalPosition() +
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distance*fastTrack.GetPrimaryTrackLocalDirection();
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// -- set final position:
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fastStep.SetPrimaryTrackFinalPosition(position);
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//---------------------------
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// Secondary:
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// Adds one "secondary":
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//
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//---------------------------
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// -- First, user has to say how many secondaries will be created:
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fastStep.SetNumberOfSecondaryTracks(1);
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//------------------------
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// -- Build the secondary:
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//------------------------
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// -- direction:
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G4ParticleMomentum direction(fastTrack.GetPrimaryTrackLocalDirection());
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direction.setZ(direction.z()*0.5);
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direction.setY(direction.y()+direction.z()*0.1);
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direction = direction.unit(); // necessary ?
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// -- dynamics (Note that many constructors exists for G4DynamicParticle
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// -- see prototype/particle+matter/particles/management/include/G4DynamicParticle.hh)
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G4DynamicParticle dynamique(G4Gamma::GammaDefinition(),
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direction,
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fastTrack.GetPrimaryTrack()->
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GetKineticEnergy()/2.);
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// -- position:
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G4double Dist;
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Dist = fastTrack.GetEnvelopeSolid()->
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DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
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direction);
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G4ThreeVector posi;
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posi = fastTrack.GetPrimaryTrackLocalPosition() + Dist*direction;
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//------------------------------------
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//-- Creation of the secondary Track:
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//------------------------------------
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fastStep.CreateSecondaryTrack(dynamique, posi,
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fastTrack.GetPrimaryTrack()->GetGlobalTime());
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}
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