Gabriele Cosmo
126 lines
4.9 KiB
C++
126 lines
4.9 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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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 *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4MagIntegratorStepper.hh,v 1.9 2002/11/20 18:09:22 japost Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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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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//
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// A Stepper must integrate over NumberOfVariables elements,
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// and also copy (from input to output) any of NoStateVariables
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// not included in the NumberOfVariables.
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//
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// So it is expected that NoStateVariables >= NumberOfVariables
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// History:
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// - 15.01.97 J. Apostolakis (J.Apostolakis@cern.ch)
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// - 20.11.02 J. Apostolakis: Added new "State" elements
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#ifndef G4MAGIntegratorSTEPPER
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#define G4MAGIntegratorSTEPPER
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#include "globals.hh"
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#include "G4EquationOfMotion.hh"
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class G4MagIntegratorStepper
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{
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public: // with description
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G4MagIntegratorStepper(G4EquationOfMotion *Equation,
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G4int numIntegrationVariables,
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G4int numStateVariables=12);
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virtual ~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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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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inline void NormaliseTangentVector( G4double vec[6] );
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// Simple utility function to (re)normalise 'unit velocity' vector.
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inline 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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inline G4int GetNumberOfVariables() const;
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// Get the number of variables that the stepper will integrate over.
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// void SetNumberOfVariables(G4int newNo); // Dangerous & obsolete ...
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inline G4int GetNumberOfStateVariables() const;
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// Get the number of variables of state variables (>= above, integration)
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virtual G4int IntegratorOrder() const = 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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inline G4EquationOfMotion *GetEquationOfMotion();
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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( G4double particleCharge, // in e+ units
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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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G4MagIntegratorStepper(const G4MagIntegratorStepper&);
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G4MagIntegratorStepper& operator=(const G4MagIntegratorStepper&);
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// Private copy constructor and assignment operator.
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private:
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G4EquationOfMotion *fEquation_Rhs;
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const G4int fNoIntegrationVariables; // Number of Variables in integration
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const G4int fNoStateVariables; // Number required for FieldTrack
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// const G4int fNumberOfVariables;
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};
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#include "G4MagIntegratorStepper.icc"
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#endif /* G4MAGIntegratorSTEPPER */
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