Gabriele Cosmo
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4EquationOfMotion.hh,v 1.4 2000/11/01 15:15:48 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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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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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[3],
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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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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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