// 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: G4MagHelicalStepper.icc,v 1.4 2000/11/01 15:15:49 gcosmo Exp $
// GEANT4 tag $Name: geant4-03-01 $
//

// 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] );
}