| [831] | 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | // $Id: G4MagIntegratorStepper.hh,v 1.12 2006/09/20 09:31:01 japost Exp $
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| [921] | 27 | // GEANT4 tag $Name: geant4-09-02-cand-01 $
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| [831] | 28 | //
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| 29 | //
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| 30 | // class G4MagIntegratorStepper
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| 31 | //
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| 32 | // Class description:
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| 33 | //
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| 34 | // Abstract base class for integrator of particle's equation of motion,
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| 35 | // used in tracking in space dependent magnetic field
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| 36 | //
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| 37 | // A Stepper must integrate over NumberOfVariables elements,
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| 38 | // and also copy (from input to output) any of NoStateVariables
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| 39 | // not included in the NumberOfVariables.
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| 40 | //
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| 41 | // So it is expected that NoStateVariables >= NumberOfVariables
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| 42 |
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| 43 | // History:
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| 44 | // - 15.01.97 J. Apostolakis (J.Apostolakis@cern.ch)
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| 45 | // --------------------------------------------------------------------
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| 46 |
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| 47 | #ifndef G4MAGIntegratorSTEPPER
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| 48 | #define G4MAGIntegratorSTEPPER
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| 49 |
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| 50 | #include "G4Types.hh"
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| 51 | #include "G4EquationOfMotion.hh"
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| 52 |
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| 53 | class G4MagIntegratorStepper
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| 54 | {
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| 55 | public: // with description
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| 56 |
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| 57 | G4MagIntegratorStepper(G4EquationOfMotion *Equation,
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| 58 | G4int numIntegrationVariables,
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| 59 | G4int numStateVariables=12);
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| 60 | virtual ~G4MagIntegratorStepper();
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| 61 | // Constructor and destructor. No actions.
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| 62 |
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| 63 | virtual void Stepper( const G4double y[],
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| 64 | const G4double dydx[],
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| 65 | G4double h,
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| 66 | G4double yout[],
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| 67 | G4double yerr[] ) = 0 ;
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| 68 | // The stepper for the Runge Kutta integration.
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| 69 | // The stepsize is fixed, with the Step size given by h.
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| 70 | // Integrates ODE starting values y[0 to 6].
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| 71 | // Outputs yout[] and its estimated error yerr[].
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| 72 |
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| 73 | virtual G4double DistChord() const = 0;
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| 74 | // Estimate the maximum distance of a chord from the true path
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| 75 | // over the segment last integrated.
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| 76 |
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| 77 | inline void NormaliseTangentVector( G4double vec[6] );
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| 78 | // Simple utility function to (re)normalise 'unit velocity' vector.
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| 79 |
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| 80 | inline void RightHandSide( const double y[], double dydx[] );
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| 81 | // Utility method to supply the standard Evaluation of the
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| 82 | // Right Hand side of the associated equation.
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| 83 |
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| 84 | inline G4int GetNumberOfVariables() const;
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| 85 | // Get the number of variables that the stepper will integrate over.
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| 86 |
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| 87 | // void SetNumberOfVariables(G4int newNo); // Dangerous & obsolete ...
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| 88 |
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| 89 | inline G4int GetNumberOfStateVariables() const;
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| 90 | // Get the number of variables of state variables (>= above, integration)
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| 91 |
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| 92 | virtual G4int IntegratorOrder() const = 0;
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| 93 | // Returns the order of the integrator
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| 94 | // i.e. its error behaviour is of the order O(h^order).
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| 95 |
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| 96 | inline G4EquationOfMotion *GetEquationOfMotion();
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| 97 | // As some steppers (eg RKG3) require other methods of Eq_Rhs
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| 98 | // this function allows for access to them.
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| 99 | inline void SetEquationOfMotion(G4EquationOfMotion* newEquation);
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| 100 |
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| 101 | private:
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| 102 |
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| 103 | G4MagIntegratorStepper(const G4MagIntegratorStepper&);
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| 104 | G4MagIntegratorStepper& operator=(const G4MagIntegratorStepper&);
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| 105 | // Private copy constructor and assignment operator.
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| 106 |
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| 107 | private:
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| 108 |
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| 109 | G4EquationOfMotion *fEquation_Rhs;
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| 110 | const G4int fNoIntegrationVariables; // Number of Variables in integration
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| 111 | const G4int fNoStateVariables; // Number required for FieldTrack
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| 112 | // const G4int fNumberOfVariables;
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| 113 | };
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| 114 |
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| 115 | #include "G4MagIntegratorStepper.icc"
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| 116 |
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| 117 | #endif /* G4MAGIntegratorSTEPPER */
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