Gabriele Cosmo
91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4MagIntegratorStepper.hh,v 1.4 2000/04/27 09:14:06 gcosmo Exp $
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// GEANT4 tag $Name: geant4-02-00 $
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//
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//
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// class G4MagIntegratorStepper
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//
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// Class description:
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//
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// Abstract base class for integrator of particle's equation of motion,
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// used in tracking in space dependent magnetic field
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// History:
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// - 15.01.97 J.Apostolakis (J.Apostolakis@cern.ch)
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#ifndef G4MAGIntegratorSTEPPER
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#define G4MAGIntegratorSTEPPER
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#include "globals.hh"
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#include "G4Mag_EqRhs.hh"
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class G4MagIntegratorStepper
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{
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public: // with description
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G4MagIntegratorStepper(G4Mag_EqRhs *EqRhs, G4int num_variables);
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~G4MagIntegratorStepper(){;}
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// Constructor and destructor. No actions.
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virtual void Stepper( const G4double y[],
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const G4double dydx[],
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const G4double h,
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G4double yout[],
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G4double yerr[] ) = 0 ;
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// The stepper for the Runge Kutta integration.
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// The stepsize is fixed, with the Step size given by h.
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// Integrates ODE starting values y[0 to 6].
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// Outputs yout[] and its estimated error yerr[].
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virtual G4double DistChord() const = 0;
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// Estimate the maximum distance of a chord from the true path
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// over the segment last integrated.
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void NormaliseTangentVector( G4double vec[6] );
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// Simple utility function to (re)normalise 'unit velocity' vector.
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virtual void RightHandSide( const double y[], double dydx[] );
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// Utility method to supply the standard Evaluation of the
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// Right Hand side of the associated equation.
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G4int GetNumberOfVariables();
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void SetNumberOfVariables(G4int newNo);
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// Get/Set the number of variables that the stepper will compile over.
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virtual G4int IntegratorOrder() = 0;
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// Returns the order of the integrator
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// i.e. its error behaviour is of the order O(h^order).
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G4EquationOfMotion *GetEquationOfMotion() const;
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// As some steppers (eg RKG3) require other methods of Eq_Rhs
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// this function allows for access to them.
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public: // without description
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#if 0
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void
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SetChargeAndMomentum( const G4double particleCharge, // in e+ units
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const G4double MomentumXc)
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// Supply the standard Evaluation of the Right Hand side
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// of the associated equation.
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{theEquation_Rhs -> SetChargeAndMomentum(particleCharge, MomentumXc);}
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#endif
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private:
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G4EquationOfMotion *fEquation_Rhs;
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G4int fNumberOfVariables;
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};
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#include "G4MagIntegratorStepper.icc"
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#endif /* G4MAGIntegratorSTEPPER */
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