//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in:                      *
// *   http://cern.ch/geant4/license                                  *
// *                                                                  *
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// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
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// * GEANT4 collaboration.                                            *
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//
//
// $Id: PrimaryGeneratorAction.cc,v 1.2 2004/12/02 16:16:54 vnivanch Exp $
// GEANT4 tag $Name: geant4-08-00-patch-01 $
//
// 

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#include "PrimaryGeneratorAction.hh"

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

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PrimaryGeneratorAction::PrimaryGeneratorAction()
{
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);
  
  // default particle kinematic

  G4ParticleDefinition* particle
           = G4ParticleTable::GetParticleTable()->FindParticle("e-");
  particleGun->SetParticleDefinition(particle);
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  particleGun->SetParticleEnergy(5.5*GeV);
  particleGun->SetParticlePosition(G4ThreeVector(0.*cm,0.*cm,-1.*cm));

}

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PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  delete particleGun;
}

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begining of event
  //

  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  
  particleGun->GeneratePrimaryVertex(anEvent);
}

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