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/// \file eventgenerator/HepMC/HepMCEx01/src/ExN04Field.cc
/// \brief Implementation of the ExN04Field class
//
// $Id: ExN04Field.cc 77801 2013-11-28 13:33:20Z gcosmo $
//

#include "G4SystemOfUnits.hh"
#include "ExN04Field.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
ExN04Field::ExN04Field()
{
  fBz = 3.0*tesla;
  frmax_sq = sqr(50.*cm);
  fzmax = 100.*cm;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
ExN04Field::~ExN04Field()
{
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void ExN04Field::GetFieldValue(const double Point[3],double *Bfield) const
{
  Bfield[0] = 0.;
  Bfield[1] = 0.;
  if ( std::abs(Point[2]) < fzmax &&
      (sqr(Point[0])+sqr(Point[1])) < frmax_sq ) {
    Bfield[2] = fBz;
  } else {
    Bfield[2] = 0.;
  }
}
