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//
/// \file runAndEvent/RE02/src/RE02PrimaryGeneratorAction.cc
/// \brief Implementation of the RE02PrimaryGeneratorAction class
//
//
//

#include "RE02PrimaryGeneratorAction.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "Randomize.hh"
#include "globals.hh"
#include "G4SystemOfUnits.hh"    

//#include "H5Cpp.h"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//
RE02PrimaryGeneratorAction::RE02PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction(),
   fParticleGun(0)
{
  G4int n_particle = 1;
  fParticleGun = new G4ParticleGun(n_particle);

// default particle
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* particle = particleTable->FindParticle("gamma");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.0,1.0,0.0));
  fParticleGun->SetParticleEnergy(40.0*keV);
//
// default beam position
  G4double position = -200./2.*cm;
//

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//
  fParticleGun->SetParticlePosition(G4ThreeVector(0.*cm, position, 0.*cm));
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//
RE02PrimaryGeneratorAction::~RE02PrimaryGeneratorAction()
{
  delete fParticleGun;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//
void RE02PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{ 

  G4ThreeVector position = fParticleGun->GetParticlePosition();
  G4double dx = (G4UniformRand()-0.5)* 142.5 *mm;
  G4double dz = (G4UniformRand()-0.5)* 0.45 * mm;
  position.setX(dx);
  position.setZ(dz);
  fParticleGun->SetParticlePosition(position);
  fParticleGun->GeneratePrimaryVertex(anEvent);
}