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: Sergey Gorbunov <sergey.gorbunov@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   : fISlice(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), fErrX(0), fErrY(0), fErrZ(0.228808),fPadPitch(0.4),fBz(-5.),
  29     fYErrorCorrection(0.33), fZErrorCorrection(0.45),
  30     fCellConnectionAngleXY(35./180.*TMath::Pi()),
  31     fCellConnectionAngleXZ(35./180.*TMath::Pi()),
  32     fMaxTrackMatchDRow(4), fTrackConnectionFactor(3.5), fTrackChiCut(3.5), fTrackChi2Cut(10)
  33 {
  34   Update();
  35 }
  36
  37 void AliHLTTPCCAParam::Initialize( Int_t iSlice,
  38                                    Int_t nRows, Double_t rowX[],
  39                                    Double_t alpha, Double_t dAlpha,
  40                                    Double_t rMin, Double_t rMax,
  41                                    Double_t zMin, Double_t zMax,
  42                                    Double_t padPitch, Double_t zSigma,
  43                                    Double_t bz
  44                                    )
  45 {
  46   // initialization
  47   fISlice = iSlice;
  48   fAlpha = alpha;
  49   fDAlpha = dAlpha;
  50   fRMin = rMin;
  51   fRMax = rMax;
  52   fZMin = zMin;
  53   fZMax = zMax;
  54   fPadPitch = padPitch;
  55   fErrY = 1.; // not in use
  56   fErrZ = zSigma;
  57   fBz = bz;
  58   fNRows = nRows;
  59   for( Int_t irow=0; irow<nRows; irow++ ){
  60     fRowX[irow] = rowX[irow];
  61   }
  62
  63   Update();
  64 }
  65
  66 void AliHLTTPCCAParam::Update()
  67 {
  68   // update of calculated values
  69   fCosAlpha = TMath::Cos(fAlpha);
  70   fSinAlpha = TMath::Sin(fAlpha);
  71   fAngleMin = fAlpha - fDAlpha/2.;
  72   fAngleMax = fAlpha + fDAlpha/2.;
  73   fErrX = fPadPitch/TMath::Sqrt(12.);
  74   fTrackChi2Cut = fTrackChiCut * fTrackChiCut;
  75 }
  76
  77 void AliHLTTPCCAParam::Slice2Global( Double_t x, Double_t y,  Double_t z,
  78                                      Double_t *X, Double_t *Y,  Double_t *Z ) const
  79 {
  80   // conversion of coorinates sector->global
  81   *X = x*fCosAlpha - y*fSinAlpha;
  82   *Y = y*fCosAlpha + x*fSinAlpha;
  83   *Z = z;
  84 }
  85
  86 void AliHLTTPCCAParam::Global2Slice( Double_t X, Double_t Y,  Double_t Z,
  87                                      Double_t *x, Double_t *y,  Double_t *z ) const
  88 {
  89   // conversion of coorinates global->sector
  90   *x = X*fCosAlpha + Y*fSinAlpha;
  91   *y = Y*fCosAlpha - X*fSinAlpha;
  92   *z = Z;
  93 }