Gabriele Cosmo
100 lines
3.9 KiB
C++
100 lines
3.9 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: G4EquationOfMotion.hh,v 1.7 2002/06/11 08:38:56 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 G4EquationOfMotion
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//
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// Class description:
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//
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// Abstract Base Class for the right hand size of the equation of
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// motion of a particle in a field.
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// History:
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// - Created. J.Apostolakis
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#ifndef G4_EquationOfMotion_DEF
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#define G4_EquationOfMotion_DEF
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#include "globals.hh"
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#include "G4Field.hh"
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class G4EquationOfMotion
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{
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public: // with description
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G4EquationOfMotion( G4Field *Field );
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virtual ~G4EquationOfMotion();
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// Constructor and virtual destructor. No operations.
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virtual void EvaluateRhsGivenB( const G4double y[],
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const G4double B[3],
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G4double dydx[] ) const = 0;
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// Given the value of the field "B", this function
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// calculates the value of the derivative dydx.
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// --------------------------------------------------------
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// This is the _only_ function a subclass must define.
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// The other two functions use Rhs_givenB.
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virtual void SetChargeMomentumMass(G4double particleCharge, // in e+ units
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G4double MomentumXc,
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G4double MassXc2) = 0;
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// Set the charge, momentum and mass of the current particle
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// --> used to set the equation's coefficients ...
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inline
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void RightHandSide( const G4double y[],
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G4double dydx[] ) const;
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// This calculates the value of the derivative dydx at y.
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// It is the usual enquiry function.
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// ---------------------------
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// (It is not virtual, but calls the virtual function above.)
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void EvaluateRhsReturnB( const G4double y[],
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G4double dydx[],
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G4double Field[] ) const;
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// Same as RHS above, but also returns the value of B.
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// Should be made the new default ? after putting dydx & B in a class.
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void GetFieldValue( const G4double Point[4],
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G4double Field[] ) const;
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// Obtain only the field - the stepper assumes it is pure Magnetic.
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// Not protected, because G4RKG3_Stepper uses it directly.
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const G4Field* GetFieldObj() const;
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void SetFieldObj(G4Field* pField);
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private:
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// static const int G4maximum_number_of_field_components = 16;
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enum { G4maximum_number_of_field_components = 16 } ;
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G4Field *itsField;
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};
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#include "G4EquationOfMotion.icc"
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#endif /* G4_EquationOfMotion_DEF */
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