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a224d738 | 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 "AliMUONClusterFinderCOG.h" | |
19 | ||
20 | #include "AliLog.h" | |
21 | #include "AliMUONCluster.h" | |
3887d11e | 22 | #include "AliMUONVDigit.h" |
a224d738 | 23 | #include "AliMUONPad.h" |
a224d738 | 24 | #include "AliMpArea.h" |
a224d738 | 25 | #include "TVector2.h" |
3887d11e | 26 | #include "AliMUONVDigitStore.h" |
a224d738 | 27 | |
3d1463c8 | 28 | //----------------------------------------------------------------------------- |
a224d738 | 29 | /// \class AliMUONClusterFinderCOG |
30 | /// | |
31 | /// A very basic (and mostly useless, probably) cluster finder. | |
32 | /// | |
33 | /// We use AliMUONPreClusterFinder to actually build the cluster, | |
34 | /// and then we simply use center-of-gravity to get the coordinates | |
35 | /// of the cluster. | |
36 | /// Only point to note is that we compute separately both | |
37 | /// cathodes when doing, in order to take the positions from the | |
38 | /// direction with the better resolution. | |
39 | /// | |
40 | /// \author Laurent Aphecetche | |
3d1463c8 | 41 | //----------------------------------------------------------------------------- |
a224d738 | 42 | |
78649106 | 43 | /// \cond CLASSIMP |
a224d738 | 44 | ClassImp(AliMUONClusterFinderCOG) |
45 | /// \endcond | |
46 | ||
47 | //_____________________________________________________________________________ | |
b1a19e07 | 48 | AliMUONClusterFinderCOG::AliMUONClusterFinderCOG(AliMUONVClusterFinder* clusterFinder) |
a224d738 | 49 | : AliMUONVClusterFinder(), |
b1a19e07 | 50 | fPreClusterFinder(clusterFinder) |
a224d738 | 51 | { |
52 | /// ctor | |
53 | } | |
54 | ||
55 | //_____________________________________________________________________________ | |
56 | AliMUONClusterFinderCOG::~AliMUONClusterFinderCOG() | |
57 | { | |
58 | /// dtor | |
59 | delete fPreClusterFinder; | |
60 | } | |
61 | ||
62 | //_____________________________________________________________________________ | |
63 | Bool_t | |
64 | AliMUONClusterFinderCOG::Prepare(const AliMpVSegmentation* segmentations[2], | |
3887d11e | 65 | const AliMUONVDigitStore& digitStore) |
a224d738 | 66 | { |
67 | /// Prepare for clustering | |
68 | ||
69 | // Find out the DetElemId | |
70 | Int_t detElemId(-1); | |
71 | ||
3887d11e | 72 | TIter next(digitStore.CreateIterator()); |
73 | AliMUONVDigit* d; | |
74 | ||
75 | d = static_cast<AliMUONVDigit*>(next()); | |
76 | ||
77 | if (d) | |
a224d738 | 78 | { |
3887d11e | 79 | detElemId = d->DetElemId(); |
a224d738 | 80 | } |
81 | ||
82 | if ( detElemId < 0 ) | |
83 | { | |
84 | AliWarning("Could not find DE. Probably no digits at all ?"); | |
85 | return kFALSE; | |
86 | } | |
87 | ||
3887d11e | 88 | return fPreClusterFinder->Prepare(segmentations,digitStore); |
a224d738 | 89 | } |
90 | ||
91 | //_____________________________________________________________________________ | |
92 | AliMUONCluster* | |
93 | AliMUONClusterFinderCOG::NextCluster() | |
94 | { | |
95 | /// Get next cluster | |
96 | ||
97 | if ( !fPreClusterFinder ) return 0x0; | |
98 | AliMUONCluster* cluster = fPreClusterFinder->NextCluster(); | |
99 | if ( cluster ) | |
100 | { | |
101 | ComputePosition(*cluster); | |
102 | ||
103 | if ( cluster->Charge() < 7 ) | |
104 | { | |
105 | // skip that one | |
106 | return NextCluster(); | |
107 | } | |
108 | } | |
109 | return cluster; | |
110 | } | |
111 | ||
112 | //_____________________________________________________________________________ | |
113 | void | |
114 | AliMUONClusterFinderCOG::ComputePosition(AliMUONCluster& cluster) | |
115 | { | |
116 | /// Compute a first estimate of cluster position by a basic center-of-gravity | |
117 | ||
118 | Double_t xmin = 1E9; | |
119 | Double_t ymin = 1E9; | |
120 | Double_t xmax = -1E9; | |
121 | Double_t ymax = -1E9; | |
122 | ||
123 | Double_t x[] = { 0.0, 0.0 }; | |
124 | Double_t y[] = { 0.0, 0.0 }; | |
125 | ||
126 | Double_t xsize[] = { 0.0, 0.0 } ; | |
127 | Double_t ysize[] = { 0.0, 0.0 } ; | |
128 | ||
129 | for ( Int_t cathode = 0; cathode < 2; ++cathode ) | |
130 | { | |
131 | for ( Int_t i = 0; i < cluster.Multiplicity(); ++i ) | |
132 | { | |
133 | AliMUONPad* pad = cluster.Pad(i); | |
134 | TVector2 padPosition = pad->Position(); | |
135 | AliMpArea area(pad->Position(),pad->Dimensions()); | |
1b36647b | 136 | xmin = TMath::Min(area.LeftBorder(),xmin); |
137 | xmax = TMath::Max(area.RightBorder(),xmax); | |
138 | ymin = TMath::Min(area.DownBorder(),ymin); | |
139 | ymax = TMath::Max(area.UpBorder(),ymax); | |
a224d738 | 140 | if ( cathode == pad->Cathode() ) |
141 | { | |
142 | x[cathode] += padPosition.X()*pad->Charge(); | |
143 | y[cathode] += padPosition.Y()*pad->Charge(); | |
144 | xsize[cathode] += pad->Dimensions().X(); | |
145 | ysize[cathode] += pad->Dimensions().Y(); | |
146 | } | |
147 | } | |
148 | if ( cluster.Charge(cathode) ) | |
149 | { | |
150 | x[cathode] /= cluster.Charge(cathode); | |
151 | y[cathode] /= cluster.Charge(cathode); | |
152 | } | |
153 | if ( cluster.Multiplicity(cathode) ) | |
154 | { | |
155 | xsize[cathode] /= cluster.Multiplicity(cathode); | |
156 | ysize[cathode] /= cluster.Multiplicity(cathode); | |
157 | } | |
158 | } | |
159 | ||
160 | Double_t xCOG = 0; | |
161 | Double_t yCOG = 0; | |
162 | ||
163 | // take the positions from the direction with the better resolution | |
164 | xCOG = ( xsize[0] < xsize[1] ) ? x[0] : x[1]; | |
165 | yCOG = ( ysize[0] < ysize[1] ) ? y[0] : y[1]; | |
166 | ||
167 | AliDebug(1,Form("Cluster mult %d (x,y)=(%e,%e) boundaries=(xmin,ymin,xmax,ymax)=(%e,%e,%e,%e)" | |
168 | " (x0,y0,x1,y1)=(%e,%e,%e,%e) ", | |
169 | cluster.Multiplicity(),xCOG,yCOG,xmin,ymin,xmax,ymax, | |
170 | x[0],y[0],x[1],y[1])); | |
171 | ||
172 | cluster.SetPosition(TVector2(xCOG,yCOG),cluster.Pad(0)->Dimensions()); // FIXME: what to put as an error here ? | |
173 | } | |
174 | ||
175 | ||
176 |