| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // $Id: G4ChordFinder.hh,v 1.19 2008/07/15 14:02:06 japost Exp $ |
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| 28 | // GEANT4 tag $Name: HEAD $ |
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| 29 | // |
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| 30 | // |
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| 31 | // class G4ChordFinder |
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| 32 | // |
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| 33 | // Class description: |
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| 34 | // |
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| 35 | // A class that provides RK integration of motion ODE (as does g4magtr) |
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| 36 | // and also has a method that returns an Approximate point on the curve |
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| 37 | // near to a (chord) point. |
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| 38 | |
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| 39 | // History: |
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| 40 | // - 25.02.97 John Apostolakis, design and implementation |
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| 41 | // - 05.03.97 V. Grichine , makeup to G4 'standard' |
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| 42 | // ------------------------------------------------------------------- |
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| 43 | |
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| 44 | #ifndef G4CHORDFINDER_HH |
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| 45 | #define G4CHORDFINDER_HH |
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| 46 | |
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| 47 | #include "G4MagIntegratorDriver.hh" |
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| 48 | #include "G4FieldTrack.hh" |
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| 49 | |
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| 50 | class G4MagneticField; |
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| 51 | |
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| 52 | class G4ChordFinder |
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| 53 | { |
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| 54 | public: // with description |
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| 55 | |
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| 56 | G4ChordFinder( G4MagInt_Driver* pIntegrationDriver ); |
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| 57 | |
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| 58 | G4ChordFinder( G4MagneticField* itsMagField, |
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| 59 | G4double stepMinimum = 1.0e-2 * mm, |
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| 60 | G4MagIntegratorStepper* pItsStepper = 0 ); |
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| 61 | // A constructor that creates defaults for all "children" classes. |
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| 62 | |
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| 63 | virtual ~G4ChordFinder(); |
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| 64 | |
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| 65 | |
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| 66 | G4double AdvanceChordLimited( G4FieldTrack& yCurrent, |
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| 67 | G4double stepInitial, |
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| 68 | G4double epsStep_Relative, |
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| 69 | const G4ThreeVector latestSafetyOrigin, |
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| 70 | G4double lasestSafetyRadius); |
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| 71 | // Uses ODE solver's driver to find the endpoint that satisfies |
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| 72 | // the chord criterion: that d_chord < delta_chord |
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| 73 | // -> Returns Length of Step taken. |
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| 74 | |
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| 75 | G4FieldTrack ApproxCurvePointS(const G4FieldTrack& curveAPointVelocity, |
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| 76 | const G4FieldTrack& curveBPointVelocity, |
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| 77 | const G4ThreeVector& currentEPoint, |
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| 78 | const G4ThreeVector& currentFPoint, |
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| 79 | const G4ThreeVector& PointG, |
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| 80 | G4bool first,G4double epsStep); |
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| 81 | |
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| 82 | G4FieldTrack ApproxCurvePointV(const G4FieldTrack& curveAPointVelocity, |
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| 83 | const G4FieldTrack& curveBPointVelocity, |
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| 84 | const G4ThreeVector& currentEPoint, |
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| 85 | G4double epsStep); |
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| 86 | |
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| 87 | inline G4double InvParabolic( const G4double xa, const G4double ya, |
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| 88 | const G4double xb, const G4double yb, |
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| 89 | const G4double xc, const G4double yc ); |
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| 90 | |
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| 91 | inline G4double GetDeltaChord() const; |
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| 92 | inline void SetDeltaChord(G4double newval); |
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| 93 | |
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| 94 | inline void SetChargeMomentumMass(G4double pCharge, // in e+ units |
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| 95 | G4double pMomentum, |
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| 96 | G4double pMass ); |
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| 97 | // Function to inform integration driver of charge, speed. |
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| 98 | |
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| 99 | inline void SetIntegrationDriver(G4MagInt_Driver* IntegrationDriver); |
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| 100 | inline G4MagInt_Driver* GetIntegrationDriver(); |
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| 101 | // Access and set Driver. |
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| 102 | |
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| 103 | inline void ResetStepEstimate(); |
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| 104 | // Clear internal state (last step estimate) |
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| 105 | |
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| 106 | inline G4int GetNoCalls(); |
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| 107 | inline G4int GetNoTrials(); // Total number of trials |
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| 108 | inline G4int GetNoMaxTrials(); // Maximum # of trials for one call |
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| 109 | // Get statistics about number of calls & trials in FindNextChord |
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| 110 | |
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| 111 | virtual void PrintStatistics(); |
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| 112 | // A report with the above -- and possibly other stats |
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| 113 | inline G4int SetVerbose( G4int newvalue=1); |
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| 114 | // Set verbosity and return old value |
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| 115 | |
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| 116 | protected: // ......................................................... |
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| 117 | |
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| 118 | inline void AccumulateStatistics( G4int noTrials ); |
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| 119 | // Accumulate the basic statistics |
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| 120 | // - other specialised ones must be kept by derived classes |
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| 121 | |
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| 122 | inline G4bool AcceptableMissDist(G4double dChordStep) const; |
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| 123 | |
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| 124 | G4double NewStep( G4double stepTrialOld, |
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| 125 | G4double dChordStep, // Current dchord estimate |
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| 126 | G4double& stepEstimate_Unconstrained ) ; |
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| 127 | |
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| 128 | virtual G4double FindNextChord( const G4FieldTrack& yStart, |
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| 129 | G4double stepMax, |
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| 130 | G4FieldTrack& yEnd, |
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| 131 | G4double& dyErr, // Error of endpoint |
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| 132 | G4double epsStep, |
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| 133 | G4double* pNextStepForAccuracy, // = 0, |
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| 134 | const G4ThreeVector latestSafetyOrigin, |
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| 135 | G4double latestSafetyRadius |
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| 136 | ); |
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| 137 | |
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| 138 | void PrintDchordTrial(G4int noTrials, |
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| 139 | G4double stepTrial, |
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| 140 | G4double oldStepTrial, |
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| 141 | G4double dChordStep); |
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| 142 | public: // no description |
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| 143 | void TestChordPrint( G4int noTrials, |
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| 144 | G4int lastStepTrial, |
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| 145 | G4double dChordStep, |
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| 146 | G4double nextStepTrial ); |
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| 147 | // Printing for monitoring ... |
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| 148 | |
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| 149 | inline G4double GetFirstFraction(); // Originally 0.999 |
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| 150 | inline G4double GetFractionLast(); // Originally 1.000 |
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| 151 | inline G4double GetFractionNextEstimate(); // Originally 0.980 |
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| 152 | inline G4double GetMultipleRadius(); // No original value |
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| 153 | // Parameters for adapting performance ... use with great care |
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| 154 | |
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| 155 | public: // with description |
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| 156 | void SetFractions_Last_Next( G4double fractLast= 0.90, |
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| 157 | G4double fractNext= 0.95 ); |
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| 158 | // Parameters for performance ... change with great care |
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| 159 | |
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| 160 | inline void SetFirstFraction(G4double fractFirst); |
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| 161 | // Parameter for performance ... change with great care |
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| 162 | |
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| 163 | protected: |
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| 164 | inline G4double GetLastStepEstimateUnc(); |
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| 165 | inline void SetLastStepEstimateUnc( G4double stepEst ); |
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| 166 | |
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| 167 | private: // ............................................................ |
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| 168 | |
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| 169 | G4ChordFinder(const G4ChordFinder&); |
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| 170 | G4ChordFinder& operator=(const G4ChordFinder&); |
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| 171 | // Private copy constructor and assignment operator. |
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| 172 | |
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| 173 | private: // ............................................................ |
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| 174 | // G4int nOK, nBAD; |
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| 175 | G4MagInt_Driver* fIntgrDriver; |
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| 176 | |
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| 177 | const G4double fDefaultDeltaChord; // SET in G4ChordFinder.cc = 0.25 mm |
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| 178 | |
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| 179 | G4double fDeltaChord; // Maximum miss distance |
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| 180 | |
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| 181 | G4double fLastStepEstimate_Unconstrained; // State information for efficiency |
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| 182 | // Variables used in construction/destruction |
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| 183 | G4bool fAllocatedStepper; |
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| 184 | G4EquationOfMotion* fEquation; |
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| 185 | G4MagIntegratorStepper* fDriversStepper; |
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| 186 | |
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| 187 | // Parameters |
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| 188 | G4double fFirstFraction, fFractionLast, fFractionNextEstimate; |
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| 189 | G4double fMultipleRadius; |
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| 190 | |
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| 191 | // For Statistics |
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| 192 | // -- G4int fNoTrials, fNoCalls; |
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| 193 | G4int fTotalNoTrials_FNC, fNoCalls_FNC, fmaxTrials_FNC; // fnoTimesMaxTrFNC; |
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| 194 | G4int fStatsVerbose; // if > 0, print Statistics in destructor |
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| 195 | }; |
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| 196 | |
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| 197 | // Inline function implementation: |
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| 198 | |
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| 199 | #include "G4ChordFinder.icc" |
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| 200 | |
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| 201 | #endif // G4CHORDFINDER_HH |
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