source: trunk/source/geometry/magneticfield/include/G4ChordFinder.icc @ 1202

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id: G4ChordFinder.icc,v 1.14 2008/10/29 14:34:35 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
// G4ChordFinder inline implementations
//
// --------------------------------------------------------------------

inline 
void G4ChordFinder::SetIntegrationDriver(G4MagInt_Driver* IntegrationDriver)
{
  fIntgrDriver=IntegrationDriver;
}

inline
G4MagInt_Driver* G4ChordFinder::GetIntegrationDriver()
{
  return fIntgrDriver;
}

inline
G4bool G4ChordFinder::AcceptableMissDist(G4double dChordStep) const
{ 
  return (dChordStep <= fDeltaChord) ;
}

inline
void G4ChordFinder::SetChargeMomentumMass(G4double pCharge, // in e+ units
                                          G4double pMomentum,
                                          G4double pMass)
{
  fIntgrDriver-> SetChargeMomentumMass(pCharge, pMomentum, pMass);
}

inline
G4double G4ChordFinder::GetDeltaChord() const
{
  return fDeltaChord;
}

inline
void G4ChordFinder::SetDeltaChord(G4double newval)
{
  fDeltaChord=newval;
}

// ......................................................................
inline 
G4double G4ChordFinder::GetLastStepEstimateUnc()
{
  return fLastStepEstimate_Unconstrained;   
} 
inline 
void G4ChordFinder::SetLastStepEstimateUnc( G4double stepEst )
{
  fLastStepEstimate_Unconstrained = stepEst;    
}
inline
void G4ChordFinder::ResetStepEstimate()
{
  fLastStepEstimate_Unconstrained = DBL_MAX;    
}

// ......................................................................
inline G4int G4ChordFinder::GetNoCalls()     { return fNoCalls_FNC; }
inline G4int G4ChordFinder::GetNoTrials()    { return fTotalNoTrials_FNC; }
inline G4int G4ChordFinder::GetNoMaxTrials() { return fmaxTrials_FNC; } 

inline G4double G4ChordFinder::GetFirstFraction() { return fFirstFraction; } 
inline G4double G4ChordFinder::GetFractionLast()  { return fFractionLast; } 
inline G4double G4ChordFinder::GetFractionNextEstimate() 
{ return fFractionNextEstimate; } 
inline G4double G4ChordFinder::GetMultipleRadius()
{ return fMultipleRadius; } 

inline void G4ChordFinder::SetFirstFraction(G4double val){ fFirstFraction=val; }

inline G4int G4ChordFinder::SetVerbose( G4int newvalue )
{ 
  G4int oldval= fStatsVerbose; 
  fStatsVerbose = newvalue;
  return oldval; 
}

inline  
void    G4ChordFinder::AccumulateStatistics( G4int noTrials ) 
{
  // Statistics 
  fTotalNoTrials_FNC += noTrials; 
  fNoCalls_FNC++; 
  // if( noTrials >= fmaxTrials_FNC ){
    if (noTrials > fmaxTrials_FNC ) { 
      fmaxTrials_FNC=noTrials; 
      // fnoTimesMaxTrFNC=0; 
    } else { 
      // fnoTimesMaxTrFNC++; 
    } 
  // } 
}
// A  member that calculates the inverse parabolic through
// the three points (x,y) and returns the value x that, for the
// inverse parabolic, corresponds to y=0.
//
inline G4double G4ChordFinder::InvParabolic ( const G4double xa, const G4double ya,
                                    const G4double xb, const G4double yb,
                                    const G4double xc, const G4double yc )
{       const G4double R = yb/yc,
                       S = yb/ya,
                       T = ya/yc;
        const G4double Q = (T-1)*(R-1)*(S-1);
        if (std::fabs(Q) <DBL_MIN ) return  DBL_MAX;
        
        const G4double P = S*(T*(R-T)*(xc-xb) - (1-R)*(xb-xa));
        return xb + P/Q;
}