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// $Id: G4MagIntegratorStepper.icc,v 1.12 2009/03/25 15:29:02 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
//

inline
G4EquationOfMotion* G4MagIntegratorStepper::GetEquationOfMotion()
{
  return  fEquation_Rhs;
} 

inline void
 G4MagIntegratorStepper::SetEquationOfMotion(G4EquationOfMotion* newEquation)
{
  if( newEquation != 0 )
  {
    fEquation_Rhs= newEquation;
  }
} 

inline
G4int G4MagIntegratorStepper::GetNumberOfVariables() const
{
  return fNoIntegrationVariables;
}


inline
G4int G4MagIntegratorStepper::GetNumberOfStateVariables() const
{
  return fNoStateVariables;
}

inline
void G4MagIntegratorStepper::RightHandSide( const  double y[], double dydx[] )   
{
  fEquation_Rhs-> RightHandSide(y, dydx);
}

inline
void G4MagIntegratorStepper::NormaliseTangentVector( G4double vec[6] )
{
  G4double drds2 = vec[3]*vec[3]+vec[4]*vec[4]+vec[5]*vec[5];

  if( std::fabs(drds2 - 1.0) > 1.e-14 )
  {
    G4double normx = 1.0 / std::sqrt(drds2);
    for(G4int i=3;i<6;i++) { vec[i] *= normx; }
  }
}

inline
void G4MagIntegratorStepper::NormalisePolarizationVector( G4double vec[12] )
{
  G4double drds2 = vec[9]*vec[9]+vec[10]*vec[10]+vec[11]*vec[11];

  if( drds2 > 0. )
  {
    if( std::fabs(drds2 - 1.0) > 1.e-14 )
    {
      G4double normx = 1.0 / std::sqrt(drds2);
      for(G4int i=9;i<12;i++)  { vec[i] *= normx; }
    }
  }
}