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// $Id: G4MagHelicalStepper.icc,v 1.4.4.1 2001/06/28 19:08:16 gunter Exp $
// GEANT4 tag $Name:  $
//

// linear Step in regions of no field

inline void
G4MagHelicalStepper::LinearStep( const G4double  yIn[],
			               G4double  h,
			               G4double  yLinear[])
{
  for( G4int i = 0; i < 3; i++ ) {
    yLinear[i]   = yIn[i] + h * yIn[i+3];
    yLinear[i+3] = yIn[i+3];
  }
}

inline void
G4MagHelicalStepper::MagFieldEvaluate(const G4double y[],
                                      G4ThreeVector& Bfield )   
{
  G4double B[3];
  GetEquationOfMotion()->  GetFieldValue(y, B);
  Bfield= G4ThreeVector( B[0], B[1], B[2] );
}