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examples/extended/physicslists/factory/shared/src/PrimaryGeneratorAction.cc
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26 // $Id: PrimaryGeneratorAction 100946 2016-11-03 11:28:08Z gcosmo $
27 //
30 
31 #include "PrimaryGeneratorAction.hh"
32 
33 #include "G4RunManager.hh"
34 #include "G4LogicalVolumeStore.hh"
35 #include "G4LogicalVolume.hh"
36 #include "G4Box.hh"
37 #include "G4Event.hh"
38 #include "G4ParticleGun.hh"
39 #include "G4ParticleTable.hh"
40 #include "G4Proton.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "Randomize.hh"
43 
44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
45 
48  fParticleGun(nullptr)
49 {
50  G4int nofParticles = 1;
51  fParticleGun = new G4ParticleGun(nofParticles);
52 
53  // default particle kinematic
57 }
58 
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60 
62 {
63  delete fParticleGun;
64 }
65 
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67 
69 {
70  // This function is called at the begining of event
71 
72  // In order to avoid dependence of PrimaryGeneratorAction
73  // on DetectorConstruction class we get world volume
74  // from G4LogicalVolumeStore
75  //
76  G4double worldZHalfLength = 0.;
77  auto worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
78 
79  // Check that the world volume has box shape
80  G4Box* worldBox = nullptr;
81  if ( worldLV ) {
82  worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
83  }
84 
85  if ( worldBox ) {
86  worldZHalfLength = worldBox->GetZHalfLength();
87  }
88  else {
90  msg << "World volume of box shape not found." << G4endl;
91  msg << "Perhaps you have changed geometry." << G4endl;
92  msg << "The gun will be place in the center.";
93  G4Exception("PrimaryGeneratorAction::GeneratePrimaries()",
94  "MyCode0002", JustWarning, msg);
95  }
96 
97  // Set gun position
99  ->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
100 
102 }
103 
104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
105 
CLHEP::Hep3Vector G4ThreeVector
std::ostringstream G4ExceptionDescription
Definition: G4Exception.hh:45
#define G4endl
Definition: G4ios.hh:61
static G4Proton * Proton()
Definition: G4Proton.cc:93
void SetParticlePosition(G4ThreeVector aPosition)
double G4double
Definition: G4Types.hh:76
void SetParticleDefinition(G4ParticleDefinition *aParticleDefinition)
Definition: G4Box.hh:64
void G4Exception(const char *originOfException, const char *exceptionCode, G4ExceptionSeverity severity, const char *description)
Definition: G4Exception.hh:65
int G4int
Definition: G4Types.hh:78
virtual void GeneratePrimaryVertex(G4Event *evt)
void SetParticleEnergy(G4double aKineticEnergy)
static constexpr double GeV
Definition: G4SIunits.hh:217
G4double GetZHalfLength() const
void SetParticleMomentumDirection(G4ParticleMomentum aMomentumDirection)
static G4LogicalVolumeStore * GetInstance()
G4LogicalVolume * GetVolume(const G4String &name, G4bool verbose=true) const