Gabriele Cosmo
136 lines
4.5 KiB
C++
136 lines
4.5 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 1.1.10.1 1999/12/07 20:47:58 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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//
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// ------------------------------------------------------------------------
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// GEANT 4 include file implementation
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//
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// For information related to this code contact:
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// CERN, IT Division (formely CN), ASD group
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// ------------------------------------------------------------------------
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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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//
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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 "globals.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: // Constructors
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G4ChordFinder( G4MagInt_Driver* pIntegrationDriver );
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// A constructor that creates defaults for all "children" classes
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//
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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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~G4ChordFinder();
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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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G4double AdvanceChordLimited( G4FieldTrack& yCurrent,
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const G4double stepInitial,
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const G4double epsStep );
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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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const G4double epsStep);
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G4double GetDeltaChord();
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void SetDeltaChord( G4double newval);
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// Routine to inform integration driver of charge, speed
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//
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void SetChargeMomentumMass( const G4double pCharge, // in e+ units
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const G4double pMomentum,
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const G4double pMass );
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// Access and set Driver
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//
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void SetIntegrationDriver( G4MagInt_Driver* IntegrationDriver)
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{ fIntgrDriver=IntegrationDriver;}
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G4MagInt_Driver* GetIntegrationDriver()
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{ return fIntgrDriver;}
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protected: // .........................................................
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G4bool AcceptableMissDist(G4double dChordStep)
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{
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return (dChordStep <= fDeltaChord) ;
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}
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G4double NewStep( const G4double stepTrialOld,
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const G4double dChordStep ) ; // Current dchord
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G4double FindNextChord( const G4FieldTrack yStart,
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const 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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// G4int nOK, nBAD;
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G4MagInt_Driver* fIntgrDriver;
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G4double fDeltaChord;
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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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inline
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G4ChordFinder:: G4ChordFinder( G4MagInt_Driver* pIntegrationDriver )
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: fDeltaChord( fDefaultDeltaChord )
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{
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fIntgrDriver= pIntegrationDriver ;
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fAllocatedStepper= false ;
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}
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inline void
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G4ChordFinder::SetChargeMomentumMass( const G4double pCharge, // in e+ units
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const G4double pMomentum,
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const G4double pMass )
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{
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fIntgrDriver-> SetChargeMomentumMass(pCharge, pMomentum, pMass);
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}
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inline G4double G4ChordFinder::GetDeltaChord()
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{ return fDeltaChord; }
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inline void G4ChordFinder::SetDeltaChord( G4double newval)
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{ fDeltaChord=newval; }
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#endif // G4CHORDFINDER_HH
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