Separating run-dependent mapping data from data, which are not
[u/mrichter/AliRoot.git] / MUON / AliMUONPreClusterFinderV2.cxx
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c13ab450 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#include "AliMUONPreClusterFinderV2.h"
19
20#include "AliLog.h"
21#include "AliMUONCluster.h"
22#include "AliMpVSegmentation.h"
23#include "TClonesArray.h"
24#include "TVector2.h"
25#include "AliMUONPad.h"
26#include "AliMUONVDigit.h"
27#include "AliMUONVDigitStore.h"
28
3d1463c8 29//-----------------------------------------------------------------------------
c13ab450 30/// \class AliMUONPreClusterFinderV2
31///
32/// Implementation of AliMUONVClusterFinder
33///
34/// This one ressembles the preclustering stage in the original ClusterFinderAZ
35///
36/// \author Laurent Aphecetche
3d1463c8 37//-----------------------------------------------------------------------------
c13ab450 38
39ClassImp(AliMUONPreClusterFinderV2)
40
41//_____________________________________________________________________________
42AliMUONPreClusterFinderV2::AliMUONPreClusterFinderV2()
43: AliMUONVClusterFinder(),
44 fClusters(0x0),
45 fSegmentations(0x0),
24935e58 46 fPads(0x0),
c13ab450 47 fDetElemId(0)
48{
49 /// ctor
c13ab450 50}
51
52//_____________________________________________________________________________
53AliMUONPreClusterFinderV2::~AliMUONPreClusterFinderV2()
54{
24935e58 55 /// dtor : note we're owner of the clusters, but not of the pads
c13ab450 56 delete fClusters;
c13ab450 57}
58
59//_____________________________________________________________________________
60Bool_t
61AliMUONPreClusterFinderV2::UsePad(const AliMUONPad& pad)
62{
63 /// Add a pad to the list of pads to be considered
64 if ( pad.DetElemId() != fDetElemId )
65 {
66 AliError(Form("Cannot add pad from DE %d to this cluster finder which is "
67 "currently dealing with DE %d",pad.DetElemId(),fDetElemId));
68 return kFALSE;
69 }
70
71 new ((*fPads[pad.Cathode()])[fPads[pad.Cathode()]->GetLast()+1]) AliMUONPad(pad);
72 // FIXME: should set the ClusterId of that new pad to be -1
73 return kTRUE;
74}
75
76//_____________________________________________________________________________
77Bool_t
24935e58 78AliMUONPreClusterFinderV2::Prepare(Int_t detElemId,
79 TClonesArray* pads[2],
80 const AliMpArea& area,
81 const AliMpVSegmentation* seg[2])
c13ab450 82{
83 /// Prepare for clustering, by giving access to segmentations and digit lists
84
24935e58 85 if ( area.IsValid() )
c13ab450 86 {
24935e58 87 AliError("Handling of area not yet implemented for this class. Please check");
c13ab450 88 }
89
24935e58 90 delete fClusters;
91 fClusters = new TClonesArray("AliMUONCluster");
92
93 fPads = pads;
94 fSegmentations = seg;
c13ab450 95
24935e58 96 fDetElemId = detElemId;
c13ab450 97
c13ab450 98 if ( fPads[0]->GetLast() < 0 && fPads[1]->GetLast() < 0 )
99 {
100 // no pad at all, nothing to do...
101 return kFALSE;
102 }
103
104 return kTRUE;
105}
106
107//_____________________________________________________________________________
108void
109AliMUONPreClusterFinderV2::AddPad(AliMUONCluster& cluster, AliMUONPad* pad)
110{
111 /// Add a pad to a cluster
112
113 cluster.AddPad(*pad);
114 pad->SetClusterId(cluster.GetUniqueID());
115
116 Int_t cathode = pad->Cathode();
117 TClonesArray& padArray = *fPads[cathode];
118 padArray.Remove(pad);
119 TIter next(&padArray);
120
121 // Check neighbours
122 TObjArray neighbours;
123 AliMpPad p = fSegmentations[pad->Cathode()]->PadByIndices(AliMpIntPair(pad->Ix(),pad->Iy()),kTRUE);
124 Int_t nn = fSegmentations[pad->Cathode()]->GetNeighbours(p,neighbours);
125 for (Int_t in = 0; in < nn; ++in)
126 {
bf0d3528 127 AliMpPad* p1 = static_cast<AliMpPad*>(neighbours.At(in));
c13ab450 128
bf0d3528 129 TIter next2(&padArray);
c13ab450 130 AliMUONPad* p2;
131
bf0d3528 132 while ( ( p2 = static_cast<AliMUONPad*>(next2()) ) )
c13ab450 133 {
bf0d3528 134 if ( !p2->IsUsed() && p2->Ix()==p1->GetIndices().GetFirst()
135 && p2->Iy() == p1->GetIndices().GetSecond() &&
c13ab450 136 p2->Cathode() == pad->Cathode() )
137 {
138 AddPad(cluster,p2);
139 }
140 }
141 } // for (Int_t in = 0;
142}
143
144namespace
145{
146//_____________________________________________________________________________
147Bool_t
148AreOverlapping(const AliMUONPad& pad, const AliMUONCluster& cluster)
149{
150 /// Whether the pad overlaps with the cluster
151
152 static Double_t precision = 1E-4; // cm
153 static TVector2 precisionAdjustment(precision,precision);//-precision,-precision);
154 for ( Int_t i = 0; i < cluster.Multiplicity(); ++i )
155 {
156 AliMUONPad* testPad = cluster.Pad(i);
157 // Note: we use negative precision numbers, meaning
158 // the area of the pads will be *increased* by these small numbers
159 // prior to check the overlap by the AreOverlapping method,
160 // so pads touching only by the corners will be considered as
161 // overlapping.
162 if ( AliMUONPad::AreOverlapping(*testPad,pad,precisionAdjustment) )
163 {
164 return kTRUE;
165 }
166 }
167 return kFALSE;
168}
169}
170
171//_____________________________________________________________________________
172AliMUONCluster*
173AliMUONPreClusterFinderV2::NextCluster()
174{
175 /// Builds the next cluster, and returns it.
176
177 // Start a new cluster
178 Int_t id = fClusters->GetLast()+1;
179 AliMUONCluster* cluster = new ((*fClusters)[id]) AliMUONCluster;
180 cluster->SetUniqueID(id);
181
182 AliMUONPad* pad;
183 TIter next(fPads[0]);
184 while ( ( pad = static_cast<AliMUONPad*>(next())) && pad->IsUsed() );
185
186 if (!pad) // protection against no pad in first cathode, which might happen
187 {
188 // try other cathode
bf0d3528 189 TIter next2(fPads[1]);
190 while ( ( pad = static_cast<AliMUONPad*>(next2())) && pad->IsUsed() );
c13ab450 191 if (!pad)
192 {
193 // we are done.
194 return 0x0;
195 }
196 // Builds (recursively) a cluster on second cathode only
197 AddPad(*cluster,pad);
198 }
199 else
200 {
201 // Builds (recursively) a cluster on first cathode only
202
203 AddPad(*cluster,pad);
204
205 // On the 2nd cathode, only add pads overlapping with the current cluster
206 TIter next1(fPads[1]);
207 AliMUONPad* testPad;
208
209 while ( ( testPad = static_cast<AliMUONPad*>(next1())))
210 {
211 if ( !testPad->IsUsed() && AreOverlapping(*testPad,*cluster) )
212 {
213 AddPad(*cluster,testPad);
214 }
215 }
216 }
217
218 if ( cluster->Multiplicity() <= 1 )
219 {
220 if ( cluster->Multiplicity() == 0 )
221 {
222 // no pad is suspicious
223 AliWarning("Got an empty cluster...");
224 }
225 // else only 1 pad (not suspicious, but kind of useless, probably noise)
226 // so we remove it from our list
227 fClusters->Remove(cluster);
228 fClusters->Compress();
229 // then proceed further
230 return NextCluster();
231 }
232
233 return cluster;
234}