include/Geant4/G4ChordFinder.icc

0001 //
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0024 // ********************************************************************
0025 //
0026 // G4ChordFinder inline implementations
0027 //
0028 // Author: J.Apostolakis - Design and implementation - 25.02.1997
0029 // --------------------------------------------------------------------
0030
0031 inline
0032 void G4ChordFinder::SetIntegrationDriver(G4VIntegrationDriver* driver)
0033 {
0034   fIntgrDriver = driver;
0035 }
0036
0037 inline
0038 G4VIntegrationDriver* G4ChordFinder::GetIntegrationDriver()
0039 {
0040   return fIntgrDriver;
0041 }
0042
0043 inline
0044 G4double G4ChordFinder::GetDeltaChord() const
0045 {
0046   return fDeltaChord;
0047 }
0048
0049 inline
0050 void G4ChordFinder::SetDeltaChord(G4double newval)
0051 {
0052   fDeltaChord = newval;
0053 }
0054
0055 inline
0056 void G4ChordFinder::ResetStepEstimate()
0057 {
0058   fIntgrDriver->OnStartTracking();
0059 }
0060
0061 inline
0062 G4int G4ChordFinder::SetVerbose( G4int newvalue )
0063 {
0064   G4int oldval = fStatsVerbose;
0065   fStatsVerbose = newvalue;
0066   return oldval;
0067 }
0068
0069 // A  member that calculates the inverse parabolic through
0070 // the three points (x,y) and returns the value x that, for the
0071 // inverse parabolic, corresponds to y=0.
0072 //
0073 inline
0074 G4double G4ChordFinder::InvParabolic ( const G4double xa, const G4double ya,
0075                                        const G4double xb, const G4double yb,
0076                                        const G4double xc, const G4double yc )
0077 {
0078   const G4double R = yb/yc,
0079                  S = yb/ya,
0080                  T = ya/yc;
0081   const G4double Q = (T-1)*(R-1)*(S-1);
0082   if (std::fabs(Q) <DBL_MIN ) { return  DBL_MAX; }
0083
0084   const G4double P = S*(T*(R-T)*(xc-xb) - (1-R)*(xb-xa));
0085   return xb + P/Q;
0086 }
0087
0088 inline G4double
0089 G4ChordFinder::AdvanceChordLimited(G4FieldTrack& yCurrent,
0090                                    G4double stepInitial,
0091                                    G4double epsStep_Relative,
0092                              const G4ThreeVector& /*latestSafetyOrigin*/,
0093                                    G4double /*lasestSafetyRadius*/)
0094 {
0095   return fIntgrDriver->AdvanceChordLimited(yCurrent, stepInitial,
0096                                            epsStep_Relative, fDeltaChord);
0097 }
0098
0099 inline
0100 void G4ChordFinder::OnComputeStep(const G4FieldTrack* track)
0101 {
0102   fIntgrDriver->OnComputeStep(track);
0103 }