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examples/extended/parameterisations/Par01/src/Par01PiModel.cc

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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
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+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
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+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
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+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+// $Id: Par01PiModel.cc 70911 2013-06-07 11:05:37Z mverderi $
+//
+#include "Par01PiModel.hh"
+
+#include "G4PionMinus.hh"
+#include "G4PionPlus.hh"
+#include "G4Gamma.hh"
+
+Par01PiModel::Par01PiModel(G4Region *anEnvelope) :
+  G4VFastSimulationModel("Par01PiModel",anEnvelope)
+{;}
+
+Par01PiModel::~Par01PiModel()
+{;}
+
+G4bool Par01PiModel::IsApplicable(const G4ParticleDefinition& particleType)
+{
+  return
+    &particleType == G4PionMinus::PionMinusDefinition() ||
+    &particleType == G4PionPlus::PionPlusDefinition();
+}
+
+G4bool Par01PiModel::ModelTrigger(const G4FastTrack& fastTrack) {
+  //-------------------------------------------------------------
+  // UserTrigger() method: method which has to decide if
+  // the parameterisation has to be applied.
+  // Here ModelTrigger() asks the user (ie you) a 0/1 answer.
+  //
+  // Note that quantities like the local/global position/direction etc..
+  // are available at this level via the fastTrack parameter (allowing 
+  // to check distance from boundaries, see below  to allow the decision)
+  //--------------------------------------------------------------
+  G4cout << "\nPar01PiModel::ModelTrigger() called:" << G4endl;
+  G4cout <<   "--------------------------------" << G4endl;
+  G4cout << "(particle is a " << fastTrack.GetPrimaryTrack()->
+    GetDefinition()->GetParticleName() << " )\n" << G4endl;
+
+  // -- Examples of available informations:
+
+  // -- position:
+  G4cout << "         Track position: " <<
+    fastTrack.GetPrimaryTrack()->GetPosition()  << "(global coord.)"   <<
+    fastTrack.GetPrimaryTrackLocalPosition()  << "(in envelope coord.)" 
+       << G4endl;
+
+  // -- direction:
+  G4cout << "         Track direction:"       <<
+    fastTrack.GetPrimaryTrack()->GetMomentum().unit() << 
+    "(global coord.)"      <<
+    fastTrack.GetPrimaryTrackLocalDirection() << "(in envelope coord.)" << 
+    G4endl;
+
+  return true;
+}
+
+void Par01PiModel::DoIt(const G4FastTrack& fastTrack, 
+                        G4FastStep& fastStep)
+  //--------------------------------------------------
+  //
+  // User method to code the parameterisation properly
+  // said.
+  //
+  //--------------------------------------------------
+{
+
+  //------------------------------------------------
+  // The primary track continues along its direction.
+  // One secondary (a photon) is added:
+  //------------------------------------------------
+  G4cout << "      Pion `model' applied\n" << G4endl;
+
+  //------------------------------
+  // Primary:
+  //    idem as in "DefaultModel":
+  //
+  //------------------------------
+  G4ThreeVector position;
+  G4double distance;
+  distance = fastTrack.GetEnvelopeSolid()->
+    DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
+                  fastTrack.GetPrimaryTrackLocalDirection());
+  position = fastTrack.GetPrimaryTrackLocalPosition() + 
+    distance*fastTrack.GetPrimaryTrackLocalDirection();
+  
+  // -- set final position:
+  fastStep.ProposePrimaryTrackFinalPosition(position);
+  
+  //---------------------------
+  // Secondary:
+  //   Adds one "secondary":
+  //---------------------------
+  // -- First, user has to say how many secondaries will be created:
+  fastStep.SetNumberOfSecondaryTracks(1);
+  
+  //------------------------
+  // -- Build the secondary:
+  //------------------------
+  // -- direction:
+  G4ParticleMomentum direction(fastTrack.GetPrimaryTrackLocalDirection());
+  direction.setZ(direction.z()*0.5);
+  direction.setY(direction.y()+direction.z()*0.1);
+  direction = direction.unit(); // necessary ?
+  
+  // -- dynamics (Note that many constructors exists for G4DynamicParticle
+  // -- see prototype/particle+matter/particles/management/include/G4DynamicParticle.hh)
+  G4DynamicParticle dynamique(G4Gamma::GammaDefinition(),
+                              direction,
+                              fastTrack.GetPrimaryTrack()->
+                              GetKineticEnergy()/2.);
+  // -- position:
+  G4double Dist;
+  Dist = fastTrack.GetEnvelopeSolid()->
+    DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
+                  direction);
+  G4ThreeVector posi;
+  posi = fastTrack.GetPrimaryTrackLocalPosition() + Dist*direction;
+  
+  //------------------------------------
+  //-- Creation of the secondary Track:
+  //------------------------------------
+  fastStep.CreateSecondaryTrack(dynamique, posi, 
+                                fastTrack.GetPrimaryTrack()->GetGlobalTime());
+  
+}