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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 | ||
16 | /* $Id$ */ | |
17 | ||
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 | //------------------------------------------------------------------------- | |
23 | #include <TClass.h> | |
24 | #include <TMath.h> | |
25 | ||
26 | #include "AliTracker.h" | |
27 | #include "AliCluster.h" | |
28 | #include "AliKalmanTrack.h" | |
29 | ||
30 | Bool_t AliTracker::fgUniformField=kTRUE; | |
31 | Double_t AliTracker::fgBz=0.; | |
32 | const AliMagF *AliTracker::fgkFieldMap=0; | |
33 | ||
34 | ClassImp(AliTracker) | |
35 | ||
36 | AliTracker::AliTracker(): | |
37 | fX(0), | |
38 | fY(0), | |
39 | fZ(0), | |
40 | fSigmaX(0.005), | |
41 | fSigmaY(0.005), | |
42 | fSigmaZ(0.010) | |
43 | { | |
44 | //-------------------------------------------------------------------- | |
45 | // The default constructor. | |
46 | //-------------------------------------------------------------------- | |
47 | if (!fgkFieldMap) AliWarning("Field map is not set. Call AliTracker::SetFieldMap before creating a tracker!"); | |
48 | } | |
49 | ||
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 !"); | |
55 | ||
56 | if (fgkFieldMap) { | |
57 | AliWarningClass("The magnetic field map has been already set !"); | |
58 | return; | |
59 | } | |
60 | ||
61 | fgUniformField=uni; | |
62 | fgkFieldMap=map; | |
63 | ||
64 | //Float_t r[3]={0.,0.,0.},b[3]; map->Field(r,b); | |
65 | //Double_t bz=-b[2]; | |
66 | ||
67 | Double_t bz=-map->SolenoidField(); | |
68 | fgBz=TMath::Sign(1e-13,bz) + bz; | |
69 | ||
70 | } | |
71 | ||
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]; | |
81 | ||
82 | Int_t i; | |
83 | for (i=0; i<noc; i++) { | |
84 | lb[i]=mx[i]=0; | |
85 | Int_t index=t->GetClusterIndex(i); | |
86 | clusters[i]=GetCluster(index); | |
87 | } | |
88 | ||
89 | Int_t lab=123456789; | |
90 | for (i=0; i<noc; i++) { | |
91 | AliCluster *c=clusters[i]; | |
92 | lab=TMath::Abs(c->GetLabel(0)); | |
93 | Int_t j; | |
94 | for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break; | |
95 | lb[j]=lab; | |
96 | (mx[j])++; | |
97 | } | |
98 | ||
99 | Int_t max=0; | |
100 | for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];} | |
101 | ||
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++; | |
109 | } | |
110 | ||
111 | if ((1.- Float_t(max)/noc) > wrong) lab=-lab; | |
112 | t->SetFakeRatio((1.- Float_t(max)/noc)); | |
113 | t->SetLabel(lab); | |
114 | ||
115 | delete[] lb; | |
116 | delete[] mx; | |
117 | delete[] clusters; | |
118 | } | |
119 | ||
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); | |
129 | c->Use(); | |
130 | } | |
131 | } |