[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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| 27 | // GEANT4 tag $Name: $ |
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| 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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