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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 | |
45 | ClassImp(AliMUONPreClusterFinder) | |
46 | ||
47 | //_____________________________________________________________________________ | |
48 | AliMUONPreClusterFinder::AliMUONPreClusterFinder() | |
49 | : AliMUONVClusterFinder(), | |
50 | fClusters(0x0), | |
e22f734a | 51 | fPads(0x0), |
52 | fDetElemId(0), | |
861d6ce8 | 53 | fArea(), |
54 | fShouldAbort(kFALSE) | |
18466557 | 55 | { |
e22f734a | 56 | /// ctor |
18466557 | 57 | } |
58 | ||
59 | //_____________________________________________________________________________ | |
60 | AliMUONPreClusterFinder::~AliMUONPreClusterFinder() | |
61 | { | |
e22f734a | 62 | /// dtor : note we're owner of the clusters, but not of the pads |
18466557 | 63 | delete fClusters; |
18466557 | 64 | } |
65 | ||
66 | //_____________________________________________________________________________ | |
67 | Bool_t | |
68 | AliMUONPreClusterFinder::UsePad(const AliMUONPad& pad) | |
69 | { | |
70 | /// Add a pad to the list of pads to be considered | |
71 | if ( pad.DetElemId() != fDetElemId ) | |
72 | { | |
73 | AliError(Form("Cannot add pad from DE %d to this cluster finder which is " | |
74 | "currently dealing with DE %d",pad.DetElemId(),fDetElemId)); | |
75 | return kFALSE; | |
76 | } | |
77 | ||
78 | new ((*fPads[pad.Cathode()])[fPads[pad.Cathode()]->GetLast()+1]) AliMUONPad(pad); | |
79 | // FIXME: should set the ClusterId of that new pad to be -1 | |
80 | return kTRUE; | |
81 | } | |
82 | ||
83 | //_____________________________________________________________________________ | |
84 | Bool_t | |
e22f734a | 85 | AliMUONPreClusterFinder::Prepare(Int_t detElemId, |
86 | TClonesArray* pads[2], | |
87 | const AliMpArea& area) | |
18466557 | 88 | { |
89 | /// Prepare for clustering, by giving access to segmentations and digit lists | |
90 | ||
18466557 | 91 | delete fClusters; |
92 | fClusters = new TClonesArray("AliMUONCluster"); | |
e22f734a | 93 | |
94 | fPads = pads; | |
95 | fDetElemId = detElemId; | |
96 | fArea = area; | |
d592a053 | 97 | |
861d6ce8 | 98 | fShouldAbort = kFALSE; |
99 | ||
18466557 | 100 | return kTRUE; |
101 | } | |
102 | ||
103 | //_____________________________________________________________________________ | |
104 | void | |
105 | AliMUONPreClusterFinder::AddPad(AliMUONCluster& cluster, AliMUONPad* pad) | |
106 | { | |
107 | /// Add a pad to a cluster | |
861d6ce8 | 108 | |
109 | if ( cluster.Multiplicity() > 500 ) | |
110 | { | |
111 | fShouldAbort = kTRUE; | |
112 | return; | |
113 | } | |
114 | ||
18466557 | 115 | cluster.AddPad(*pad); |
116 | ||
117 | Int_t cathode = pad->Cathode(); | |
118 | TClonesArray& padArray = *fPads[cathode]; | |
d592a053 | 119 | // WARNING: this Remove method uses the AliMUONPad::IsEqual if that method is |
120 | // present (otherwise just compares pointers) : so that one must be correct | |
121 | // if implemented ! | |
18466557 | 122 | padArray.Remove(pad); |
d592a053 | 123 | // TObject* o = padArray.Remove(pad); |
124 | // if (!o) | |
125 | // { | |
126 | // AliFatal("Oups. Could not remove pad from pads to consider. Aborting as anyway " | |
127 | // " we'll get an infinite loop. Please check the AliMUONPad::IsEqual method" | |
128 | // " as the first suspect for failed remove"); | |
129 | // } | |
18466557 | 130 | TIter next(&padArray); |
131 | AliMUONPad* testPad; | |
d592a053 | 132 | |
18466557 | 133 | while ( ( testPad = static_cast<AliMUONPad*>(next()))) |
134 | { | |
135 | if ( AliMUONPad::AreNeighbours(*testPad,*pad) ) | |
136 | { | |
137 | AddPad(cluster,testPad); | |
138 | } | |
139 | } | |
140 | } | |
141 | ||
142 | //_____________________________________________________________________________ | |
143 | Bool_t | |
144 | AreOverlapping(const AliMUONPad& pad, const AliMUONCluster& cluster) | |
145 | { | |
146 | /// Whether the pad overlaps with the cluster | |
147 | ||
148 | static Double_t precision = 1E-4; // cm | |
149 | static TVector2 precisionAdjustment(precision,precision);//-precision,-precision); | |
150 | for ( Int_t i = 0; i < cluster.Multiplicity(); ++i ) | |
151 | { | |
152 | AliMUONPad* testPad = cluster.Pad(i); | |
153 | // Note: we use negative precision numbers, meaning | |
154 | // the area of the pads will be *increased* by these small numbers | |
155 | // prior to check the overlap by the AreOverlapping method, | |
156 | // so pads touching only by the corners will be considered as | |
157 | // overlapping. | |
158 | if ( AliMUONPad::AreOverlapping(*testPad,pad,precisionAdjustment) ) | |
159 | { | |
160 | return kTRUE; | |
161 | } | |
162 | } | |
163 | return kFALSE; | |
164 | } | |
165 | ||
e22f734a | 166 | //_____________________________________________________________________________ |
167 | AliMUONPad* | |
168 | AliMUONPreClusterFinder::GetNextPad(Int_t cathode) const | |
169 | { | |
5bec63e7 | 170 | /// Return the next unused pad of given cathode, which is within fArea |
171 | ||
e22f734a | 172 | TIter next(fPads[cathode]); |
173 | ||
174 | if ( !fArea.IsValid() ) | |
175 | { | |
176 | return static_cast<AliMUONPad*>(next()); | |
177 | } | |
178 | else | |
179 | { | |
180 | AliMUONPad* pad; | |
181 | while ( ( pad = static_cast<AliMUONPad*>(next())) ) | |
182 | { | |
183 | AliMpArea padArea(pad->Position(),pad->Dimensions()); | |
184 | ||
185 | if (fArea.Overlap(padArea)) return pad; | |
186 | ||
187 | } | |
188 | return 0x0; | |
189 | } | |
190 | } | |
191 | ||
18466557 | 192 | //_____________________________________________________________________________ |
193 | AliMUONCluster* | |
194 | AliMUONPreClusterFinder::NextCluster() | |
195 | { | |
196 | /// Builds the next cluster, and returns it. | |
2060b217 | 197 | // AliCodeTimerAuto("pre-clustering") |
d592a053 | 198 | |
18466557 | 199 | // Start a new cluster |
200 | Int_t id = fClusters->GetLast()+1; | |
201 | AliMUONCluster* cluster = new ((*fClusters)[id]) AliMUONCluster; | |
202 | cluster->SetUniqueID(id); | |
203 | ||
e22f734a | 204 | AliMUONPad* pad = GetNextPad(0); |
18466557 | 205 | |
206 | if (!pad) // protection against no pad in first cathode, which might happen | |
207 | { | |
208 | // try other cathode | |
e22f734a | 209 | pad = GetNextPad(1); |
18466557 | 210 | if (!pad) |
211 | { | |
212 | // we are done. | |
213 | return 0x0; | |
214 | } | |
215 | // Builds (recursively) a cluster on second cathode only | |
216 | AddPad(*cluster,pad); | |
217 | } | |
218 | else | |
219 | { | |
220 | // Builds (recursively) a cluster on first cathode only | |
221 | AddPad(*cluster,pad); | |
222 | ||
861d6ce8 | 223 | if ( !ShouldAbort() ) |
18466557 | 224 | { |
861d6ce8 | 225 | // On the 2nd cathode, only add pads overlapping with the current cluster |
226 | TClonesArray& padArray = *fPads[1]; | |
227 | TIter next(&padArray); | |
228 | AliMUONPad* testPad; | |
229 | ||
230 | while ( ( testPad = static_cast<AliMUONPad*>(next())) && !ShouldAbort() ) | |
18466557 | 231 | { |
861d6ce8 | 232 | if (AreOverlapping(*testPad,*cluster) ) |
233 | { | |
234 | AddPad(*cluster,testPad); | |
235 | } | |
18466557 | 236 | } |
237 | } | |
238 | } | |
239 | ||
861d6ce8 | 240 | if ( ShouldAbort() ) |
241 | { | |
242 | AliError("Aborting clustering of that DE because we've got too many pads"); | |
243 | fClusters->Remove(cluster); | |
244 | fClusters->Compress(); | |
245 | return 0x0; | |
246 | } | |
247 | ||
18466557 | 248 | if ( cluster->Multiplicity() <= 1 ) |
249 | { | |
250 | if ( cluster->Multiplicity() == 0 ) | |
251 | { | |
252 | // no pad is suspicious | |
253 | AliWarning("Got an empty cluster..."); | |
254 | } | |
255 | // else only 1 pad (not suspicious, but kind of useless, probably noise) | |
256 | // so we remove it from our list | |
257 | fClusters->Remove(cluster); | |
258 | fClusters->Compress(); | |
259 | // then proceed further | |
260 | return NextCluster(); | |
261 | } | |
262 | ||
263 | return cluster; | |
264 | } |