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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 | #include "AliMUONPreClusterFinder.h" | |
19 | ||
20 | #include "AliLog.h" | |
21 | #include "AliMUONCluster.h" | |
22 | #include "AliMpVSegmentation.h" | |
23 | #include "TClonesArray.h" | |
24 | #include "AliMpArea.h" | |
25 | #include "TVector2.h" | |
26 | #include "AliMUONPad.h" | |
27 | #include "AliMUONVDigit.h" | |
28 | #include "AliMUONVDigitStore.h" | |
29 | ||
30 | /// \class AliMUONPreClusterFinder | |
31 | /// | |
32 | /// Implementation of AliMUONVClusterFinder | |
33 | /// | |
34 | /// This class simply find adjacent pads to form clusters | |
35 | /// | |
36 | /// \author Laurent Aphecetche | |
37 | ||
38 | ClassImp(AliMUONPreClusterFinder) | |
39 | ||
40 | //_____________________________________________________________________________ | |
41 | AliMUONPreClusterFinder::AliMUONPreClusterFinder() | |
42 | : AliMUONVClusterFinder(), | |
43 | fClusters(0x0), | |
44 | fSegmentations(0x0), | |
45 | fDetElemId(0) | |
46 | { | |
47 | /// ctor | |
48 | for ( Int_t i = 0; i < 2; ++i ) | |
49 | { | |
50 | fPads[i] = 0x0; | |
51 | } | |
52 | } | |
53 | ||
54 | //_____________________________________________________________________________ | |
55 | AliMUONPreClusterFinder::~AliMUONPreClusterFinder() | |
56 | { | |
57 | /// dtor : note we're owner of the pads and the clusters, but not of | |
58 | /// the remaining objects (digits, segmentations) | |
59 | delete fClusters; | |
60 | for ( Int_t i = 0; i < 2; ++i ) | |
61 | { | |
62 | delete fPads[i]; | |
63 | } | |
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 | |
85 | AliMUONPreClusterFinder::Prepare(const AliMpVSegmentation* segmentations[2], | |
86 | const AliMUONVDigitStore& digitStore) | |
87 | // FIXME : add area on which to look for clusters here. | |
88 | { | |
89 | /// Prepare for clustering, by giving access to segmentations and digit lists | |
90 | ||
91 | fSegmentations = segmentations; | |
92 | ||
93 | delete fClusters; | |
94 | fClusters = new TClonesArray("AliMUONCluster"); | |
95 | for ( Int_t i = 0; i < 2; ++i ) | |
96 | { | |
97 | delete fPads[i]; | |
98 | fPads[i] = new TClonesArray("AliMUONPad"); | |
99 | } | |
100 | ||
101 | fDetElemId = -1; | |
102 | ||
103 | TIter next(digitStore.CreateIterator()); | |
104 | AliMUONVDigit* d; | |
105 | ||
106 | while ( ( d = static_cast<AliMUONVDigit*>(next()) ) ) | |
107 | { | |
108 | Int_t ix = d->PadX(); | |
109 | Int_t iy = d->PadY(); | |
110 | Int_t cathode = d->Cathode(); | |
111 | AliMpPad pad = fSegmentations[cathode]->PadByIndices(AliMpIntPair(ix,iy)); | |
112 | TClonesArray& padArray = *(fPads[cathode]); | |
113 | if ( fDetElemId == -1 ) | |
114 | { | |
115 | fDetElemId = d->DetElemId(); | |
116 | } | |
117 | else | |
118 | { | |
119 | if ( d->DetElemId() != fDetElemId ) | |
120 | { | |
121 | AliError("Something is seriously wrong with DE. Aborting clustering"); | |
122 | return kFALSE; | |
123 | } | |
124 | } | |
125 | ||
126 | AliMUONPad mpad(fDetElemId,cathode, | |
127 | ix,iy,pad.Position().X(),pad.Position().Y(), | |
128 | pad.Dimensions().X(),pad.Dimensions().Y(), | |
129 | d->Charge()); | |
130 | if ( d->IsSaturated() ) mpad.SetSaturated(kTRUE); | |
131 | new (padArray[padArray.GetLast()+1]) AliMUONPad(mpad); | |
132 | } | |
133 | if ( fPads[0]->GetLast() < 0 && fPads[1]->GetLast() < 0 ) | |
134 | { | |
135 | // no pad at all, nothing to do... | |
136 | return kFALSE; | |
137 | } | |
138 | ||
139 | return kTRUE; | |
140 | } | |
141 | ||
142 | //_____________________________________________________________________________ | |
143 | void | |
144 | AliMUONPreClusterFinder::AddPad(AliMUONCluster& cluster, AliMUONPad* pad) | |
145 | { | |
146 | /// Add a pad to a cluster | |
147 | cluster.AddPad(*pad); | |
148 | ||
149 | Int_t cathode = pad->Cathode(); | |
150 | TClonesArray& padArray = *fPads[cathode]; | |
151 | padArray.Remove(pad); | |
152 | padArray.Compress(); | |
153 | TIter next(&padArray); | |
154 | AliMUONPad* testPad; | |
155 | ||
156 | while ( ( testPad = static_cast<AliMUONPad*>(next()))) | |
157 | { | |
158 | if ( AliMUONPad::AreNeighbours(*testPad,*pad) ) | |
159 | { | |
160 | AddPad(cluster,testPad); | |
161 | } | |
162 | } | |
163 | } | |
164 | ||
165 | //_____________________________________________________________________________ | |
166 | Bool_t | |
167 | AreOverlapping(const AliMUONPad& pad, const AliMUONCluster& cluster) | |
168 | { | |
169 | /// Whether the pad overlaps with the cluster | |
170 | ||
171 | static Double_t precision = 1E-4; // cm | |
172 | static TVector2 precisionAdjustment(precision,precision);//-precision,-precision); | |
173 | for ( Int_t i = 0; i < cluster.Multiplicity(); ++i ) | |
174 | { | |
175 | AliMUONPad* testPad = cluster.Pad(i); | |
176 | // Note: we use negative precision numbers, meaning | |
177 | // the area of the pads will be *increased* by these small numbers | |
178 | // prior to check the overlap by the AreOverlapping method, | |
179 | // so pads touching only by the corners will be considered as | |
180 | // overlapping. | |
181 | if ( AliMUONPad::AreOverlapping(*testPad,pad,precisionAdjustment) ) | |
182 | { | |
183 | return kTRUE; | |
184 | } | |
185 | } | |
186 | return kFALSE; | |
187 | } | |
188 | ||
189 | //_____________________________________________________________________________ | |
190 | AliMUONCluster* | |
191 | AliMUONPreClusterFinder::NextCluster() | |
192 | { | |
193 | /// Builds the next cluster, and returns it. | |
194 | ||
195 | // Start a new cluster | |
196 | Int_t id = fClusters->GetLast()+1; | |
197 | AliMUONCluster* cluster = new ((*fClusters)[id]) AliMUONCluster; | |
198 | cluster->SetUniqueID(id); | |
199 | ||
200 | AliMUONPad* pad = static_cast<AliMUONPad*>(fPads[0]->First()); | |
201 | ||
202 | if (!pad) // protection against no pad in first cathode, which might happen | |
203 | { | |
204 | // try other cathode | |
205 | pad = static_cast<AliMUONPad*>(fPads[1]->First()); | |
206 | if (!pad) | |
207 | { | |
208 | // we are done. | |
209 | return 0x0; | |
210 | } | |
211 | // Builds (recursively) a cluster on second cathode only | |
212 | AddPad(*cluster,pad); | |
213 | } | |
214 | else | |
215 | { | |
216 | // Builds (recursively) a cluster on first cathode only | |
217 | AddPad(*cluster,pad); | |
218 | ||
219 | // On the 2nd cathode, only add pads overlapping with the current cluster | |
220 | TClonesArray& padArray = *fPads[1]; | |
221 | TIter next(&padArray); | |
222 | AliMUONPad* testPad; | |
223 | ||
224 | while ( ( testPad = static_cast<AliMUONPad*>(next()))) | |
225 | { | |
226 | if ( AreOverlapping(*testPad,*cluster) ) | |
227 | { | |
228 | AddPad(*cluster,testPad); | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
233 | if ( cluster->Multiplicity() <= 1 ) | |
234 | { | |
235 | if ( cluster->Multiplicity() == 0 ) | |
236 | { | |
237 | // no pad is suspicious | |
238 | AliWarning("Got an empty cluster..."); | |
239 | } | |
240 | // else only 1 pad (not suspicious, but kind of useless, probably noise) | |
241 | // so we remove it from our list | |
242 | fClusters->Remove(cluster); | |
243 | fClusters->Compress(); | |
244 | // then proceed further | |
245 | return NextCluster(); | |
246 | } | |
247 | ||
248 | return cluster; | |
249 | } |