//
// ********************************************************************
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//
// Code developed by:
//  S.Larsson
//
//    ********************************************
//    *                                          *
//    *    PurgMagPrimaryGeneratorAction.cc     *
//    *                                          *
//    ********************************************
//
// $Id$
//

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#include "PurgMagPrimaryGeneratorAction.hh"

#include "PurgMagDetectorConstruction.hh"

#include "G4SystemOfUnits.hh"
#include "G4UnitsTable.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4Electron.hh"


//Print position of primaries.
#define POSITION 0

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PurgMagPrimaryGeneratorAction::PurgMagPrimaryGeneratorAction()
  :rndmVertex(false)
{
  //default kinematic
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);
  
  G4ParticleDefinition* particle
    = G4Electron::Definition();

  particleGun->SetParticleDefinition(particle);
  particleGun->SetParticleEnergy(50.*MeV);

  //Momentum Direction
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,-1.));
  
}

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

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void PurgMagPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begining of event
  //Start position of primaries
  G4double z0 = 15.*cm;
  G4double x0 = 0.*cm;
  G4double y0 = 0.*cm;
  particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
  particleGun->GeneratePrimaryVertex(anEvent);

#if POSITION  
  G4cout << "\n----Particle Gun--------------------------------------------\n";
  G4cout << "\n ---> SetParticlePosition(G4ThreeVector(x0,y0,z0)) ";
  G4cout << "\n ---> x0 = " << x0 << " "<< G4BestUnit(x0,"Length");
  G4cout << "\n ---> y0 = " << y0 << " "<< G4BestUnit(y0,"Length");
  G4cout << "\n ---> z0 = " << z0 << " "<< G4BestUnit(z0,"Length");
  G4cout << "\n-----------------------------------------------------------\n";
#endif
}

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