Gabriele Cosmo
112 lines
3.9 KiB
C++
112 lines
3.9 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: G4ChordFinder.hh,v 1.5 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 G4ChordFinder
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//
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// Class description:
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//
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// A class that provides RK integration of motion ODE (as does g4magtr)
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// and also has a method that returns an Approximate point on the curve
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// near to a (chord) point.
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// History:
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// - 25.02.97 John Apostolakis, design and implementation
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// - 05.03.97 V. Grichine , makeup to G4 'standard'
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#ifndef G4CHORDFINDER_HH
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#define G4CHORDFINDER_HH
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#include "G4MagIntegratorDriver.hh"
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#include "G4FieldTrack.hh"
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#include "G4MagneticField.hh"
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// class G4Mag_EqRhs;
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// class G4MagIntegratorStepper;
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class G4ChordFinder
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{
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public: // with description
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G4ChordFinder( G4MagInt_Driver* pIntegrationDriver );
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G4ChordFinder( G4MagneticField* itsMagField,
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G4double stepMinimum = 1.0e-2 * mm,
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G4MagIntegratorStepper* pItsStepper = 0 );
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// A constructor that creates defaults for all "children" classes.
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~G4ChordFinder();
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G4double AdvanceChordLimited( G4FieldTrack& yCurrent,
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G4double stepInitial,
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G4double epsStep_Relative );
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// Uses ODE solver's driver to find the endpoint that satisfies
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// the chord criterion: that d_chord < delta_chord
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// -> Returns Length of Step taken.
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G4FieldTrack ApproxCurvePointV(const G4FieldTrack& curveAPointVelocity,
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const G4FieldTrack& curveBPointVelocity,
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const G4ThreeVector& currentEPoint,
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G4double epsStep);
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inline G4double GetDeltaChord() const;
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inline void SetDeltaChord(G4double newval);
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inline void SetChargeMomentumMass(G4double pCharge, // in e+ units
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G4double pMomentum,
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G4double pMass );
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// Function to inform integration driver of charge, speed.
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inline void SetIntegrationDriver(G4MagInt_Driver* IntegrationDriver);
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inline G4MagInt_Driver* GetIntegrationDriver();
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// Access and set Driver.
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protected: // .........................................................
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inline G4bool AcceptableMissDist(G4double dChordStep) const;
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G4double NewStep( G4double stepTrialOld,
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G4double dChordStep, // Current dchord estimate
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G4double& stepEstimate_Unconstrained ) ;
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G4double FindNextChord( const G4FieldTrack yStart,
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G4double stepMax,
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G4FieldTrack& yEnd,
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G4double& dyErr, // Error of endpoint
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G4double epsStep );
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private: // ............................................................
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G4ChordFinder(const G4ChordFinder&);
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G4ChordFinder& operator=(const G4ChordFinder&);
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// Private copy constructor and assignment operator.
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private: // ............................................................
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// G4int nOK, nBAD;
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G4MagInt_Driver* fIntgrDriver;
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G4double fDeltaChord; // Maximum miss distance
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G4double fLastStepEstimate_Unconstrained; // State information for efficiency
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static const G4double fDefaultDeltaChord; // SET in G4ChordFinder.cc = 3 mm
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// Variables used in construction/destruction
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G4bool fAllocatedStepper;
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G4Mag_EqRhs* fEquation;
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G4MagIntegratorStepper* fDriversStepper;
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};
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// Inline function implementation:
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#include "G4ChordFinder.icc"
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#endif // G4CHORDFINDER_HH
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