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[u/mrichter/AliRoot.git] / STEER / AliTracker.cxx
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be9c5115 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
acd84897 16/* $Id$ */
fb17acd4 17
be9c5115 18//-------------------------------------------------------------------------
19// Implementation of the AliTracker class
9b83b8cc 20// that is the base for AliTPCtracker, AliITStrackerV2 and AliTRDtracker
21// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
be9c5115 22//-------------------------------------------------------------------------
116cbefd 23
be9c5115 24#include <TMath.h>
25
26#include "AliTracker.h"
27#include "AliCluster.h"
28#include "AliKalmanTrack.h"
f37d970d 29#include "AliLog.h"
41377c29 30#include "AliRun.h"
31#include "AliMagF.h"
32
41377c29 33extern AliRun* gAlice;
be9c5115 34
3b242889 35const AliMagF *AliTracker::fgkFieldMap=0;
36
be9c5115 37ClassImp(AliTracker)
38
3b242889 39AliTracker::AliTracker():
40 fEventN(0),
41 fStoreBarrel(1),
42 fX(0),
43 fY(0),
44 fZ(0),
45 fSigmaX(0.005),
46 fSigmaY(0.005),
47 fSigmaZ(0.010)
48{
49 //--------------------------------------------------------------------
50 // The default constructor.
51 //--------------------------------------------------------------------
52 AliMagF *field=gAlice->Field();
f37d970d 53 if (field==0) AliFatal("Can't access the field map !");
3b242889 54 SetFieldMap(field);
55}
56
57void AliTracker::SetFieldMap(const AliMagF* map) {
58 //--------------------------------------------------------------------
59 //This passes the field map to the reconstruction.
60 //--------------------------------------------------------------------
f37d970d 61 if (map==0) AliFatalClass("Can't access the field map !");
3b242889 62 AliKalmanTrack::SetConvConst(1000/0.299792458/map->SolenoidField());
63 fgkFieldMap=map;
64}
65
be9c5115 66//__________________________________________________________________________
67void AliTracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const {
68 //--------------------------------------------------------------------
69 //This function "cooks" a track label. If label<0, this track is fake.
70 //--------------------------------------------------------------------
71 Int_t noc=t->GetNumberOfClusters();
72 Int_t *lb=new Int_t[noc];
73 Int_t *mx=new Int_t[noc];
74 AliCluster **clusters=new AliCluster*[noc];
75
76 Int_t i;
77 for (i=0; i<noc; i++) {
78 lb[i]=mx[i]=0;
79 Int_t index=t->GetClusterIndex(i);
80 clusters[i]=GetCluster(index);
81 }
82
83 Int_t lab=123456789;
84 for (i=0; i<noc; i++) {
85 AliCluster *c=clusters[i];
86 lab=TMath::Abs(c->GetLabel(0));
87 Int_t j;
88 for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break;
89 lb[j]=lab;
90 (mx[j])++;
91 }
92
93 Int_t max=0;
94 for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];}
95
96 for (i=0; i<noc; i++) {
97 AliCluster *c=clusters[i];
babd135a 98 //if (TMath::Abs(c->GetLabel(1)) == lab ||
99 // TMath::Abs(c->GetLabel(2)) == lab ) max++;
100 if (TMath::Abs(c->GetLabel(0)!=lab))
101 if (TMath::Abs(c->GetLabel(1)) == lab ||
102 TMath::Abs(c->GetLabel(2)) == lab ) max++;
be9c5115 103 }
104
105 if ((1.- Float_t(max)/noc) > wrong) lab=-lab;
babd135a 106 t->SetFakeRatio((1.- Float_t(max)/noc));
be9c5115 107 t->SetLabel(lab);
108
109 delete[] lb;
110 delete[] mx;
111 delete[] clusters;
112}
113
114//____________________________________________________________________________
115void AliTracker::UseClusters(const AliKalmanTrack *t, Int_t from) const {
116 //------------------------------------------------------------------
117 //This function marks clusters associated with the track.
118 //------------------------------------------------------------------
119 Int_t noc=t->GetNumberOfClusters();
120 for (Int_t i=from; i<noc; i++) {
121 Int_t index=t->GetClusterIndex(i);
122 AliCluster *c=GetCluster(index);
123 c->Use();
124 }
125}