1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 //-------------------------------------------------------------------------
19 // Implementation of the AliTracker class
20 // that is the base for AliTPCtracker, AliITStrackerV2 and AliTRDtracker
21 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
22 //-------------------------------------------------------------------------
26 #include "AliTracker.h"
27 #include "AliCluster.h"
28 #include "AliKalmanTrack.h"
30 Bool_t AliTracker::fgUniformField=kTRUE;
31 Double_t AliTracker::fgBz=0.;
32 const AliMagF *AliTracker::fgkFieldMap=0;
36 AliTracker::AliTracker():
44 //--------------------------------------------------------------------
45 // The default constructor.
46 //--------------------------------------------------------------------
47 if (!fgkFieldMap) AliWarning("Field map is not set. Call AliTracker::SetFieldMap before creating a tracker!");
50 void AliTracker::SetFieldMap(const AliMagF* map, Bool_t uni) {
51 //--------------------------------------------------------------------
52 //This passes the field map to the reconstruction.
53 //--------------------------------------------------------------------
54 if (map==0) AliFatalClass("Can't access the field map !");
57 AliWarningClass("The magnetic field map has been already set !");
64 //Float_t r[3]={0.,0.,0.},b[3]; map->Field(r,b);
67 Double_t bz=-map->SolenoidField();
68 fgBz=TMath::Sign(1e-13,bz) + bz;
72 //__________________________________________________________________________
73 void AliTracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const {
74 //--------------------------------------------------------------------
75 //This function "cooks" a track label. If label<0, this track is fake.
76 //--------------------------------------------------------------------
77 Int_t noc=t->GetNumberOfClusters();
78 Int_t *lb=new Int_t[noc];
79 Int_t *mx=new Int_t[noc];
80 AliCluster **clusters=new AliCluster*[noc];
83 for (i=0; i<noc; i++) {
85 Int_t index=t->GetClusterIndex(i);
86 clusters[i]=GetCluster(index);
90 for (i=0; i<noc; i++) {
91 AliCluster *c=clusters[i];
92 lab=TMath::Abs(c->GetLabel(0));
94 for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break;
100 for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];}
102 for (i=0; i<noc; i++) {
103 AliCluster *c=clusters[i];
104 //if (TMath::Abs(c->GetLabel(1)) == lab ||
105 // TMath::Abs(c->GetLabel(2)) == lab ) max++;
106 if (TMath::Abs(c->GetLabel(0)!=lab))
107 if (TMath::Abs(c->GetLabel(1)) == lab ||
108 TMath::Abs(c->GetLabel(2)) == lab ) max++;
111 if ((1.- Float_t(max)/noc) > wrong) lab=-lab;
112 t->SetFakeRatio((1.- Float_t(max)/noc));
120 //____________________________________________________________________________
121 void AliTracker::UseClusters(const AliKalmanTrack *t, Int_t from) const {
122 //------------------------------------------------------------------
123 //This function marks clusters associated with the track.
124 //------------------------------------------------------------------
125 Int_t noc=t->GetNumberOfClusters();
126 for (Int_t i=from; i<noc; i++) {
127 Int_t index=t->GetClusterIndex(i);
128 AliCluster *c=GetCluster(index);