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 //-------------------------------------------------------------------------
27 #include "AliTracker.h"
28 #include "AliCluster.h"
29 #include "AliKalmanTrack.h"
31 Bool_t AliTracker::fgUniformField=kTRUE;
32 Double_t AliTracker::fgBz=kAlmost0Field;
33 const AliMagF *AliTracker::fgkFieldMap=0;
37 AliTracker::AliTracker():
46 //--------------------------------------------------------------------
47 // The default constructor.
48 //--------------------------------------------------------------------
49 if (!fgkFieldMap) AliWarning("Field map is not set. Call AliTracker::SetFieldMap before creating a tracker!");
52 //__________________________________________________________________________
53 AliTracker::AliTracker(const AliTracker &atr):
62 //--------------------------------------------------------------------
63 // The default constructor.
64 //--------------------------------------------------------------------
65 if (!fgkFieldMap) AliWarning("Field map is not set. Call AliTracker::SetFieldMap before creating a tracker!");
68 //__________________________________________________________________________
69 void AliTracker::SetFieldMap(const AliMagF* map, Bool_t uni) {
70 //--------------------------------------------------------------------
71 //This passes the field map to the reconstruction.
72 //--------------------------------------------------------------------
73 if (map==0) AliFatalClass("Can't access the field map !");
76 AliWarningClass("The magnetic field map has been already set !");
83 //Float_t r[3]={0.,0.,0.},b[3]; map->Field(r,b);
86 Double_t bz=-map->SolenoidField();
87 fgBz=TMath::Sign(kAlmost0Field,bz) + bz;
91 //__________________________________________________________________________
92 void AliTracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const {
93 //--------------------------------------------------------------------
94 //This function "cooks" a track label. If label<0, this track is fake.
95 //--------------------------------------------------------------------
96 Int_t noc=t->GetNumberOfClusters();
97 Int_t *lb=new Int_t[noc];
98 Int_t *mx=new Int_t[noc];
99 AliCluster **clusters=new AliCluster*[noc];
102 for (i=0; i<noc; i++) {
104 Int_t index=t->GetClusterIndex(i);
105 clusters[i]=GetCluster(index);
109 for (i=0; i<noc; i++) {
110 AliCluster *c=clusters[i];
111 lab=TMath::Abs(c->GetLabel(0));
113 for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break;
119 for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];}
121 for (i=0; i<noc; i++) {
122 AliCluster *c=clusters[i];
123 //if (TMath::Abs(c->GetLabel(1)) == lab ||
124 // TMath::Abs(c->GetLabel(2)) == lab ) max++;
125 if (TMath::Abs(c->GetLabel(0)!=lab))
126 if (TMath::Abs(c->GetLabel(1)) == lab ||
127 TMath::Abs(c->GetLabel(2)) == lab ) max++;
130 if ((1.- Float_t(max)/noc) > wrong) lab=-lab;
131 t->SetFakeRatio((1.- Float_t(max)/noc));
139 //____________________________________________________________________________
140 void AliTracker::UseClusters(const AliKalmanTrack *t, Int_t from) const {
141 //------------------------------------------------------------------
142 //This function marks clusters associated with the track.
143 //------------------------------------------------------------------
144 Int_t noc=t->GetNumberOfClusters();
145 for (Int_t i=from; i<noc; i++) {
146 Int_t index=t->GetClusterIndex(i);
147 AliCluster *c=GetCluster(index);
152 Double_t AliTracker::GetBz(Float_t *r) {
153 //------------------------------------------------------------------
154 // Returns Bz (kG) at the point "r" .
155 //------------------------------------------------------------------
156 Float_t b[3]; fgkFieldMap->Field(r,b);
157 Double_t bz=-Double_t(b[2]);
158 return (TMath::Sign(kAlmost0Field,bz) + bz);