new conversion of MeV to ADC from test beam inserted
[u/mrichter/AliRoot.git] / MUON / AliMUONPreClusterFinder.cxx
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18466557 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 "AliMUONPreClusterFinder.h"
19
18466557 20#include "AliMUONCluster.h"
18466557 21#include "AliMUONPad.h"
3887d11e 22#include "AliMUONVDigit.h"
23#include "AliMUONVDigitStore.h"
e22f734a 24
25#include "AliMpArea.h"
26#include "AliMpConstants.h"
27#include "AliMpVSegmentation.h"
28
29#include "AliLog.h"
30
31#include <Riostream.h>
32#include <TClonesArray.h>
33#include <TVector2.h>
18466557 34
3d1463c8 35//-----------------------------------------------------------------------------
18466557 36/// \class AliMUONPreClusterFinder
37///
38/// Implementation of AliMUONVClusterFinder
39///
40/// This class simply find adjacent pads to form clusters
41///
42/// \author Laurent Aphecetche
3d1463c8 43//-----------------------------------------------------------------------------
18466557 44
45ClassImp(AliMUONPreClusterFinder)
46
47//_____________________________________________________________________________
48AliMUONPreClusterFinder::AliMUONPreClusterFinder()
49: AliMUONVClusterFinder(),
50 fClusters(0x0),
e22f734a 51 fPads(0x0),
52 fDetElemId(0),
53 fArea()
18466557 54{
e22f734a 55 /// ctor
18466557 56}
57
58//_____________________________________________________________________________
59AliMUONPreClusterFinder::~AliMUONPreClusterFinder()
60{
e22f734a 61 /// dtor : note we're owner of the clusters, but not of the pads
18466557 62 delete fClusters;
18466557 63}
64
65//_____________________________________________________________________________
66Bool_t
67AliMUONPreClusterFinder::UsePad(const AliMUONPad& pad)
68{
69 /// Add a pad to the list of pads to be considered
70 if ( pad.DetElemId() != fDetElemId )
71 {
72 AliError(Form("Cannot add pad from DE %d to this cluster finder which is "
73 "currently dealing with DE %d",pad.DetElemId(),fDetElemId));
74 return kFALSE;
75 }
76
77 new ((*fPads[pad.Cathode()])[fPads[pad.Cathode()]->GetLast()+1]) AliMUONPad(pad);
78 // FIXME: should set the ClusterId of that new pad to be -1
79 return kTRUE;
80}
81
82//_____________________________________________________________________________
83Bool_t
e22f734a 84AliMUONPreClusterFinder::Prepare(Int_t detElemId,
85 TClonesArray* pads[2],
86 const AliMpArea& area)
18466557 87{
88 /// Prepare for clustering, by giving access to segmentations and digit lists
89
18466557 90 delete fClusters;
91 fClusters = new TClonesArray("AliMUONCluster");
e22f734a 92
93 fPads = pads;
94 fDetElemId = detElemId;
95 fArea = area;
d592a053 96
18466557 97 return kTRUE;
98}
99
100//_____________________________________________________________________________
101void
102AliMUONPreClusterFinder::AddPad(AliMUONCluster& cluster, AliMUONPad* pad)
103{
104 /// Add a pad to a cluster
105 cluster.AddPad(*pad);
106
107 Int_t cathode = pad->Cathode();
108 TClonesArray& padArray = *fPads[cathode];
d592a053 109 // WARNING: this Remove method uses the AliMUONPad::IsEqual if that method is
110 // present (otherwise just compares pointers) : so that one must be correct
111 // if implemented !
18466557 112 padArray.Remove(pad);
d592a053 113 // TObject* o = padArray.Remove(pad);
114// if (!o)
115// {
116// AliFatal("Oups. Could not remove pad from pads to consider. Aborting as anyway "
117// " we'll get an infinite loop. Please check the AliMUONPad::IsEqual method"
118// " as the first suspect for failed remove");
119// }
18466557 120 TIter next(&padArray);
121 AliMUONPad* testPad;
d592a053 122
18466557 123 while ( ( testPad = static_cast<AliMUONPad*>(next())))
124 {
125 if ( AliMUONPad::AreNeighbours(*testPad,*pad) )
126 {
127 AddPad(cluster,testPad);
128 }
129 }
130}
131
132//_____________________________________________________________________________
133Bool_t
134AreOverlapping(const AliMUONPad& pad, const AliMUONCluster& cluster)
135{
136 /// Whether the pad overlaps with the cluster
137
138 static Double_t precision = 1E-4; // cm
139 static TVector2 precisionAdjustment(precision,precision);//-precision,-precision);
140 for ( Int_t i = 0; i < cluster.Multiplicity(); ++i )
141 {
142 AliMUONPad* testPad = cluster.Pad(i);
143 // Note: we use negative precision numbers, meaning
144 // the area of the pads will be *increased* by these small numbers
145 // prior to check the overlap by the AreOverlapping method,
146 // so pads touching only by the corners will be considered as
147 // overlapping.
148 if ( AliMUONPad::AreOverlapping(*testPad,pad,precisionAdjustment) )
149 {
150 return kTRUE;
151 }
152 }
153 return kFALSE;
154}
155
156//_____________________________________________________________________________
e22f734a 157AliMUONPad*
158AliMUONPreClusterFinder::GetNextPad(Int_t cathode) const
159{
5bec63e7 160/// Return the next unused pad of given cathode, which is within fArea
161
e22f734a 162 TIter next(fPads[cathode]);
163
164 if ( !fArea.IsValid() )
165 {
166 return static_cast<AliMUONPad*>(next());
167 }
168 else
169 {
170 AliMUONPad* pad;
171 while ( ( pad = static_cast<AliMUONPad*>(next())) )
172 {
173 AliMpArea padArea(pad->Position(),pad->Dimensions());
174
175 if (fArea.Overlap(padArea)) return pad;
176
177 }
178 return 0x0;
179 }
180}
181
182//_____________________________________________________________________________
18466557 183AliMUONCluster*
184AliMUONPreClusterFinder::NextCluster()
185{
186 /// Builds the next cluster, and returns it.
2060b217 187// AliCodeTimerAuto("pre-clustering")
d592a053 188
18466557 189 // Start a new cluster
190 Int_t id = fClusters->GetLast()+1;
191 AliMUONCluster* cluster = new ((*fClusters)[id]) AliMUONCluster;
192 cluster->SetUniqueID(id);
193
e22f734a 194 AliMUONPad* pad = GetNextPad(0);
18466557 195
196 if (!pad) // protection against no pad in first cathode, which might happen
197 {
198 // try other cathode
e22f734a 199 pad = GetNextPad(1);
18466557 200 if (!pad)
201 {
202 // we are done.
203 return 0x0;
204 }
205 // Builds (recursively) a cluster on second cathode only
206 AddPad(*cluster,pad);
207 }
208 else
209 {
210 // Builds (recursively) a cluster on first cathode only
211 AddPad(*cluster,pad);
212
213 // On the 2nd cathode, only add pads overlapping with the current cluster
214 TClonesArray& padArray = *fPads[1];
215 TIter next(&padArray);
216 AliMUONPad* testPad;
217
218 while ( ( testPad = static_cast<AliMUONPad*>(next())))
219 {
e22f734a 220 if (AreOverlapping(*testPad,*cluster) )
18466557 221 {
222 AddPad(*cluster,testPad);
223 }
224 }
225 }
226
227 if ( cluster->Multiplicity() <= 1 )
228 {
229 if ( cluster->Multiplicity() == 0 )
230 {
231 // no pad is suspicious
232 AliWarning("Got an empty cluster...");
233 }
234 // else only 1 pad (not suspicious, but kind of useless, probably noise)
235 // so we remove it from our list
236 fClusters->Remove(cluster);
237 fClusters->Compress();
238 // then proceed further
239 return NextCluster();
240 }
241
242 return cluster;
243}