HLT/TPCLib/tracking-ca/AliHLTTPCCAParam.cxx

   1 // @(#) $Id$
   2 //*************************************************************************
   3 // This file is property of and copyright by the ALICE HLT Project        *
   4 // ALICE Experiment at CERN, All rights reserved.                         *
   5 //                                                                        *
   6 // Primary Authors: Jochen Thaeder <thaeder@kip.uni-heidelberg.de>        *
   7 //                  Ivan Kisel <kisel@kip.uni-heidelberg.de>              *
   8 //                  for The ALICE HLT Project.                            *
   9 //                                                                        *
  10 // Permission to use, copy, modify and distribute this software and its   *
  11 // documentation strictly for non-commercial purposes is hereby granted   *
  12 // without fee, provided that the above copyright notice appears in all   *
  13 // copies and that both the copyright notice and this permission notice   *
  14 // appear in the supporting documentation. The authors make no claims     *
  15 // about the suitability of this software for any purpose. It is          *
  16 // provided "as is" without express or implied warranty.                  *
  17 //*************************************************************************
  18
  19 #include "AliHLTTPCCAParam.h"
  20 #include "TMath.h"
  21
  22
  23 ClassImp(AliHLTTPCCAParam)
  24
  25 AliHLTTPCCAParam::AliHLTTPCCAParam()
  26   : fISec(0),fNRows(63),fAlpha(0.174533), fDAlpha(0.349066),
  27     fCosAlpha(0), fSinAlpha(0), fAngleMin(0), fAngleMax(0), fRMin(83.65), fRMax(133.3),
  28     fZMin(0.0529937), fZMax(249.778), fErrZ(0.228808), fErrX(0), fErrY(0),fPadPitch(0.4),fBz(-5.),
  29     fCellConnectionFactor(3), fTrackConnectionFactor(5), fTrackChiCut(6), fTrackChi2Cut(0), fMaxTrackMatchDRow(4),
  30     fYErrorCorrection(0.33), fZErrorCorrection(0.45)
  31 {
  32   Update();
  33 }
  34
  35 void AliHLTTPCCAParam::Initialize( Int_t ParISec,
  36                                    Int_t ParNRows, Double_t ParRowX[],
  37                                    Double_t ParAlpha, Double_t ParDAlpha,
  38                                    Double_t ParRMin, Double_t ParRMax,
  39                                    Double_t ParZMin, Double_t ParZMax,
  40                                    Double_t ParPadPitch, Double_t ParZSigma,
  41                                    Double_t ParBz
  42                                    )
  43 {
  44   // initialization
  45   fISec = ParISec;
  46   fAlpha = ParAlpha;
  47   fDAlpha = ParDAlpha;
  48   fRMin = ParRMin;
  49   fRMax = ParRMax;
  50   fZMin = ParZMin;
  51   fZMax = ParZMax;
  52   fPadPitch = ParPadPitch;
  53   fErrY = 1.; // not in use
  54   fErrZ = ParZSigma;
  55   fBz = ParBz;
  56   fNRows = ParNRows;
  57   for( Int_t irow=0; irow<ParNRows; irow++ ){
  58     fRowX[irow] = ParRowX[irow];
  59   }
  60
  61   Update();
  62 }
  63
  64 void AliHLTTPCCAParam::Update()
  65 {
  66   // update of calculated values
  67   fCosAlpha = TMath::Cos(fAlpha);
  68   fSinAlpha = TMath::Sin(fAlpha);
  69   fAngleMin = fAlpha - fDAlpha/2.;
  70   fAngleMax = fAlpha + fDAlpha/2.;
  71   fErrX = fPadPitch/TMath::Sqrt(12.);
  72   fTrackChi2Cut = fTrackChiCut * fTrackChiCut;
  73 }
  74
  75 void AliHLTTPCCAParam::Sec2Global(   Double_t x, Double_t y,  Double_t z,
  76                                      Double_t *X, Double_t *Y,  Double_t *Z ) const
  77 {
  78   // conversion of coorinates sector->global
  79   *X = x*fCosAlpha - y*fSinAlpha;
  80   *Y = y*fCosAlpha + x*fSinAlpha;
  81   *Z = z;
  82 }
  83
  84 void AliHLTTPCCAParam::Global2Sec( Double_t X, Double_t Y,  Double_t Z,
  85                                    Double_t *x, Double_t *y,  Double_t *z ) const
  86 {
  87   // conversion of coorinates global->sector
  88   *x = X*fCosAlpha + Y*fSinAlpha;
  89   *y = Y*fCosAlpha - X*fSinAlpha;
  90   *z = Z;
  91 }