Gabriele Cosmo
127 lines
5.5 KiB
C++
127 lines
5.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4VIntegrationDriver
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//
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// Class description:
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//
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// Abstract base class for 'driver' classes which are responsible for
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// undertaking integration of an state given an equation of motion and
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// within acceptable error bound(s).
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//
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// Different integration methods are meant to be provided via this
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// common interface, and can span the original type (explicit Runge Kutta
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// methods), enhanced RK methods and alternatives such as the
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// Bulirsch-Stoer and multi-step methods.
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//
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// The drivers' key mission is to insure that the error is below set values.
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// Author: Dmitry Sorokin, Google Summer of Code 2017
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// Supervision: John Apostolakis, CERN
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// --------------------------------------------------------------------
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#ifndef G4VINTEGRATION_DRIVER_HH
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#define G4VINTEGRATION_DRIVER_HH
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#include "G4Types.hh"
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#include "G4FieldTrack.hh"
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#include "G4MagIntegratorStepper.hh"
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class G4VIntegrationDriver
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{
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public:
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virtual ~G4VIntegrationDriver() = default;
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virtual G4double AdvanceChordLimited(G4FieldTrack& track,
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G4double hstep,
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G4double eps,
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G4double chordDistance) = 0;
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virtual G4bool AccurateAdvance(G4FieldTrack& track,
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G4double hstep,
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G4double eps, // Requested y_err/hstep
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G4double hinitial = 0 ) = 0;
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virtual void SetEquationOfMotion(G4EquationOfMotion* equation) = 0;
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virtual G4EquationOfMotion* GetEquationOfMotion() = 0;
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virtual void RenewStepperAndAdjust(G4MagIntegratorStepper* pItsStepper);
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// Method for compatibility -- relevant only for G4MagIntegratorDriver
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virtual void SetVerboseLevel(G4int level) = 0;
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virtual G4int GetVerboseLevel() const = 0;
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virtual void OnComputeStep() = 0;
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virtual void OnStartTracking() = 0;
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public: // without description
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//[[deprecated("will be removed")]]
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virtual G4bool QuickAdvance(G4FieldTrack& /*track*/, // INOUT
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const G4double /*dydx*/[],
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G4double /*hstep*/,
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G4double& /*dchord_step*/,
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G4double& /*dyerr*/) { return false; }
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//[[deprecated("will be removed")]]
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virtual void GetDerivatives(const G4FieldTrack& track,
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G4double dydx[]) const = 0;
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//[[deprecated("will be removed")]]
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virtual void GetDerivatives(const G4FieldTrack& track,
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G4double dydx[],
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G4double field[]) const = 0;
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//[[deprecated("use GetEquationOfMotion() instead of GetStepper()->GetEquationOfMotion()")]]
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virtual const G4MagIntegratorStepper* GetStepper() const = 0;
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virtual G4MagIntegratorStepper* GetStepper() = 0;
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//[[deprecated("will be removed")]]
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virtual G4double ComputeNewStepSize(G4double errMaxNorm, // normalised error
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G4double hstepCurrent) = 0;
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// Taking the last step's normalised error, calculate
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// a step size for the next step.
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// - Can limit the next step's size within a factor of the current one.
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virtual G4bool DoesReIntegrate() const = 0;
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// Whether the driver implementates re-integration
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// - original Integration driver will re-start and re-calculate interval => yes
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// - Interpolation Driver does not recalculate (it interpolates)
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// Basically answer: does this driver *Recalculate* when AccurateAdvance is called ?
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virtual void StreamInfo( std::ostream& os ) const = 0;
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// Write out the parameters / state of the driver
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friend std::ostream& operator<<( std::ostream& os, const G4VIntegrationDriver& id);
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protected:
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static constexpr G4double max_stepping_increase = 5;
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static constexpr G4double max_stepping_decrease = 0.1;
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};
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#endif
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