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// $Id: G4MagIntegratorStepper.icc,v 1.10 2006/09/20 09:31:46 japost Exp $
// GEANT4 tag $Name:  $
//

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::SetNumberOfVariables(G4int newNo)
// {
//   fNumberOfVariables = newNo;
// }

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

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

   if( std::fabs(drds2 - 1.0) > 1.e-14 ){
      double normx = 1.0 / std::sqrt(drds2);
      for(int i=0;i<3;i++) 
	 vec[i+3] *= normx;   
   }
}