New design of tracking classes (Yu.Belikov)
[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
16//-------------------------------------------------------------------------
17// Implementation of the AliTracker class
18//
19// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
20//-------------------------------------------------------------------------
21#include <TMath.h>
22
23#include "AliTracker.h"
24#include "AliCluster.h"
25#include "AliKalmanTrack.h"
26
27ClassImp(AliTracker)
28
29//__________________________________________________________________________
30void AliTracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const {
31 //--------------------------------------------------------------------
32 //This function "cooks" a track label. If label<0, this track is fake.
33 //--------------------------------------------------------------------
34 Int_t noc=t->GetNumberOfClusters();
35 Int_t *lb=new Int_t[noc];
36 Int_t *mx=new Int_t[noc];
37 AliCluster **clusters=new AliCluster*[noc];
38
39 Int_t i;
40 for (i=0; i<noc; i++) {
41 lb[i]=mx[i]=0;
42 Int_t index=t->GetClusterIndex(i);
43 clusters[i]=GetCluster(index);
44 }
45
46 Int_t lab=123456789;
47 for (i=0; i<noc; i++) {
48 AliCluster *c=clusters[i];
49 lab=TMath::Abs(c->GetLabel(0));
50 Int_t j;
51 for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break;
52 lb[j]=lab;
53 (mx[j])++;
54 }
55
56 Int_t max=0;
57 for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];}
58
59 for (i=0; i<noc; i++) {
60 AliCluster *c=clusters[i];
61 if (TMath::Abs(c->GetLabel(1)) == lab ||
62 TMath::Abs(c->GetLabel(2)) == lab ) max++;
63 }
64
65 if ((1.- Float_t(max)/noc) > wrong) lab=-lab;
66 t->SetLabel(lab);
67
68 delete[] lb;
69 delete[] mx;
70 delete[] clusters;
71}
72
73//____________________________________________________________________________
74void AliTracker::UseClusters(const AliKalmanTrack *t, Int_t from) const {
75 //------------------------------------------------------------------
76 //This function marks clusters associated with the track.
77 //------------------------------------------------------------------
78 Int_t noc=t->GetNumberOfClusters();
79 for (Int_t i=from; i<noc; i++) {
80 Int_t index=t->GetClusterIndex(i);
81 AliCluster *c=GetCluster(index);
82 c->Use();
83 }
84}
85
86