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geant4/LEMuSR/G4Modified/G4ChordFinder.hh
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geant4/LEMuSR/G4Modified/G4ChordFinder.hh
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//
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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: G4ChordFinder.hh,v 1.16 2003/11/13 17:53:47 japost Exp $
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// GEANT4 tag $Name: geant4-06-00-patch-01 $
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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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// -------------------------------------------------------------------
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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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class G4MagneticField;
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class G4ElectricField;
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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( G4ElectricField* itsElField,
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G4double stepMinimum = 1.0e-2 * mm,
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G4MagIntegratorStepper* pItsStepper = 0 );
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virtual ~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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const G4ThreeVector latestSafetyOrigin,
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G4double lasestSafetyRadius);
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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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inline void ResetStepEstimate();
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// Clear internal state (last step estimate)
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inline G4int GetNoCalls();
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inline G4int GetNoTrials(); // Total number of trials
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inline G4int GetNoMaxTrials(); // Maximum # of trials for one call
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// Get statistics about number of calls & trials in FindNextChord
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virtual void PrintStatistics();
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// A report with the above -- and possibly other stats
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inline G4int SetVerbose( G4int newvalue=1);
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// Set verbosity and return old value
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protected: // .........................................................
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inline void AccumulateStatistics( G4int noTrials );
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// Accumulate the basic statistics
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// - other specialised ones must be kept by derived classes
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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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virtual 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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G4double* pNextStepForAccuracy, // = 0,
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const G4ThreeVector latestSafetyOrigin,
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G4double latestSafetyRadius
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);
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void PrintDchordTrial(G4int noTrials,
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G4double stepTrial,
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G4double oldStepTrial,
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G4double dChordStep);
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public: // no description
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void TestChordPrint( G4int noTrials,
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G4int lastStepTrial,
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G4double dChordStep,
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G4double nextStepTrial );
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// Printing for monitoring ...
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inline G4double GetFirstFraction(); // Originally 0.999
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inline G4double GetFractionLast(); // Originally 1.000
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inline G4double GetFractionNextEstimate(); // Originally 0.980
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inline G4double GetMultipleRadius(); // No original value
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// Parameters for adapting performance ... use with great care
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public: // with description
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void SetFractions_Last_Next( G4double fractLast= 0.90,
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G4double fractNext= 0.95 );
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// Parameters for performance ... change with great care
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inline void SetFirstFraction(G4double fractFirst);
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// Parameter for performance ... change with great care
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protected:
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inline G4double GetLastStepEstimateUnc();
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inline void SetLastStepEstimateUnc( G4double stepEst );
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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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const G4double fDefaultDeltaChord; // SET in G4ChordFinder.cc = 0.25 mm
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G4double fDeltaChord; // Maximum miss distance
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G4double fLastStepEstimate_Unconstrained; // State information for efficiency
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// Variables used in construction/destruction
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G4bool fAllocatedStepper;
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G4EquationOfMotion* fEquation;
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G4MagIntegratorStepper* fDriversStepper;
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// Parameters
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G4double fFirstFraction, fFractionLast, fFractionNextEstimate;
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G4double fMultipleRadius;
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// For Statistics
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// -- G4int fNoTrials, fNoCalls;
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G4int fTotalNoTrials_FNC, fNoCalls_FNC, fmaxTrials_FNC; // fnoTimesMaxTrFNC;
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G4int fStatsVerbose; // if > 0, print Statistics in destructor
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G4double itime, ftime;
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G4ElectricField* mfield;
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G4int firstChord;
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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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