//
// ********************************************************************
// * 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                                  *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
// * This  code  implementation is the  intellectual property  of the *
// * GEANT4 collaboration.                                            *
// * By copying,  distributing  or modifying the Program (or any work *
// * based  on  the Program)  you indicate  your  acceptance of  this *
// * statement, and all its terms.                                    *
// ********************************************************************
//
//
// $Id: EXPO_Primary.icc,v 1.3.4.1 2001/06/28 19:06:31 gunter Exp $
// GEANT4 tag $Name:  $
//
//  See also G4/run/example/EXPO_PrimaryGeneratorAction.cc.

#include <G4VUserPrimaryGeneratorAction.hh>

#include <globals.hh>
#include <G4Event.hh>
#include <G4ParticleGun.hh>
#include <G4ParticleTable.hh>
#include <G4ParticleDefinition.hh>

class EXPO_PrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction
{
  private:
    G4ParticleGun* particleGun;
  public:
    EXPO_PrimaryGeneratorAction()  
      {
	G4int                 n_particle = 1;
	G4String              particleName;
	particleGun           = new G4ParticleGun(n_particle);
	G4ParticleTable*      particleTable = G4ParticleTable::GetParticleTable();
	G4ParticleDefinition* particle      = particleTable->FindParticle(particleName="e-");
	particleGun->SetParticleDefinition        (particle);
	particleGun->SetParticleEnergy            (1.*GeV);
	particleGun->SetParticleMomentumDirection (G4ThreeVector(1.,0.,0.));
	particleGun->SetParticlePosition          (G4ThreeVector(0.*cm,0.*cm,0.*cm));
      }
    ~EXPO_PrimaryGeneratorAction()
      {
	delete particleGun;
      }
    void GeneratePrimaries(G4Event* anEvent)
      {
	particleGun->GeneratePrimaryVertex(anEvent);
      }

};