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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 | |
24935e58 | 64 | AliMUONClusterFinderCOG::Prepare(Int_t detElemId, |
65 | TClonesArray* pads[2], | |
66 | const AliMpArea& area) | |
a224d738 | 67 | { |
68 | /// Prepare for clustering | |
69 | ||
24935e58 | 70 | return fPreClusterFinder->Prepare(detElemId,pads,area); |
a224d738 | 71 | } |
72 | ||
73 | //_____________________________________________________________________________ | |
74 | AliMUONCluster* | |
75 | AliMUONClusterFinderCOG::NextCluster() | |
76 | { | |
77 | /// Get next cluster | |
78 | ||
79 | if ( !fPreClusterFinder ) return 0x0; | |
80 | AliMUONCluster* cluster = fPreClusterFinder->NextCluster(); | |
81 | if ( cluster ) | |
82 | { | |
83 | ComputePosition(*cluster); | |
84 | ||
85 | if ( cluster->Charge() < 7 ) | |
86 | { | |
87 | // skip that one | |
88 | return NextCluster(); | |
89 | } | |
90 | } | |
91 | return cluster; | |
92 | } | |
93 | ||
94 | //_____________________________________________________________________________ | |
95 | void | |
96 | AliMUONClusterFinderCOG::ComputePosition(AliMUONCluster& cluster) | |
97 | { | |
98 | /// Compute a first estimate of cluster position by a basic center-of-gravity | |
99 | ||
100 | Double_t xmin = 1E9; | |
101 | Double_t ymin = 1E9; | |
102 | Double_t xmax = -1E9; | |
103 | Double_t ymax = -1E9; | |
104 | ||
105 | Double_t x[] = { 0.0, 0.0 }; | |
106 | Double_t y[] = { 0.0, 0.0 }; | |
107 | ||
108 | Double_t xsize[] = { 0.0, 0.0 } ; | |
109 | Double_t ysize[] = { 0.0, 0.0 } ; | |
110 | ||
111 | for ( Int_t cathode = 0; cathode < 2; ++cathode ) | |
112 | { | |
113 | for ( Int_t i = 0; i < cluster.Multiplicity(); ++i ) | |
114 | { | |
115 | AliMUONPad* pad = cluster.Pad(i); | |
116 | TVector2 padPosition = pad->Position(); | |
117 | AliMpArea area(pad->Position(),pad->Dimensions()); | |
1b36647b | 118 | xmin = TMath::Min(area.LeftBorder(),xmin); |
119 | xmax = TMath::Max(area.RightBorder(),xmax); | |
120 | ymin = TMath::Min(area.DownBorder(),ymin); | |
121 | ymax = TMath::Max(area.UpBorder(),ymax); | |
a224d738 | 122 | if ( cathode == pad->Cathode() ) |
123 | { | |
124 | x[cathode] += padPosition.X()*pad->Charge(); | |
125 | y[cathode] += padPosition.Y()*pad->Charge(); | |
126 | xsize[cathode] += pad->Dimensions().X(); | |
127 | ysize[cathode] += pad->Dimensions().Y(); | |
128 | } | |
129 | } | |
130 | if ( cluster.Charge(cathode) ) | |
131 | { | |
132 | x[cathode] /= cluster.Charge(cathode); | |
133 | y[cathode] /= cluster.Charge(cathode); | |
134 | } | |
135 | if ( cluster.Multiplicity(cathode) ) | |
136 | { | |
137 | xsize[cathode] /= cluster.Multiplicity(cathode); | |
138 | ysize[cathode] /= cluster.Multiplicity(cathode); | |
139 | } | |
140 | } | |
141 | ||
142 | Double_t xCOG = 0; | |
143 | Double_t yCOG = 0; | |
144 | ||
145 | // take the positions from the direction with the better resolution | |
146 | xCOG = ( xsize[0] < xsize[1] ) ? x[0] : x[1]; | |
147 | yCOG = ( ysize[0] < ysize[1] ) ? y[0] : y[1]; | |
148 | ||
149 | AliDebug(1,Form("Cluster mult %d (x,y)=(%e,%e) boundaries=(xmin,ymin,xmax,ymax)=(%e,%e,%e,%e)" | |
150 | " (x0,y0,x1,y1)=(%e,%e,%e,%e) ", | |
151 | cluster.Multiplicity(),xCOG,yCOG,xmin,ymin,xmax,ymax, | |
152 | x[0],y[0],x[1],y[1])); | |
153 | ||
154 | cluster.SetPosition(TVector2(xCOG,yCOG),cluster.Pad(0)->Dimensions()); // FIXME: what to put as an error here ? | |
155 | } | |
156 | ||
157 | ||
158 |