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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-2003, 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 | #include <Riostream.h> | |
16 | #include <TArrayF.h> | |
17 | #include <TRandom.h> | |
18 | #include "AliESDVertex.h" | |
19 | #include <AliITSVertexerFast.h> | |
20 | #include "AliHeader.h" | |
21 | #include "AliGenEventHeader.h" | |
22 | #include "AliRun.h" | |
23 | #include "AliITSLoader.h" | |
24 | #include "AliRunLoader.h" | |
25 | ||
26 | ///////////////////////////////////////////////////////////////////////// | |
27 | // // | |
28 | // Fast vertexer - True (i.e. generated) vertex coordinates // | |
29 | // are smeared with gaussians of given width // | |
30 | // Origin: masera@to.infn.it 25/09/2003 // | |
31 | // // | |
32 | ///////////////////////////////////////////////////////////////////////// | |
33 | ClassImp(AliITSVertexerFast) | |
34 | ||
35 | ||
36 | ||
37 | //______________________________________________________________________ | |
38 | AliITSVertexerFast::AliITSVertexerFast():AliITSVertexer(), | |
39 | fSmear(0) | |
40 | { | |
41 | // Default Constructor | |
42 | fSmear = 0; | |
43 | AliRunLoader *rl =AliRunLoader::Instance(); | |
44 | TTree *trK=(TTree*)rl->TreeK(); | |
45 | if(!trK)AliFatal("This class should be used only with simulated events!!"); | |
46 | rl->LoadHeader(); | |
47 | } | |
48 | ||
49 | //______________________________________________________________________ | |
50 | AliITSVertexerFast::AliITSVertexerFast(Double_t *smear):AliITSVertexer(), | |
51 | fSmear(0) | |
52 | { | |
53 | // Standard constructor | |
54 | fSmear = new Double_t[3]; | |
55 | for(Int_t i=0;i<3;i++)fSmear[i]=smear[i]; | |
56 | AliInfo(Form("Gaussian smaring of the generated vertex. Sigmas (x,y,z) = %12.5f , %12.5f , %12.5f cm",fSmear[0],fSmear[1],fSmear[2])); | |
57 | AliRunLoader *rl =AliRunLoader::Instance(); | |
58 | TTree *trK=(TTree*)rl->TreeK(); | |
59 | if(!trK)AliFatal("This class should be used only with simulated events!!"); | |
60 | rl->LoadHeader(); | |
61 | ||
62 | } | |
63 | ||
64 | ||
65 | //______________________________________________________________________ | |
66 | AliITSVertexerFast::~AliITSVertexerFast(){ | |
67 | // Destructor | |
68 | if(fSmear)delete [] fSmear; | |
69 | fSmear = 0; | |
70 | } | |
71 | ||
72 | //______________________________________________________________________ | |
73 | AliESDVertex* AliITSVertexerFast::FindVertexForCurrentEvent(TTree *itsClusterTree){ | |
74 | // Defines the AliITSVertex for the current event | |
75 | AliWarning(Form("This class should be used only with simulated events!! Input cluster tree (%p) will not be used!!",itsClusterTree)); | |
76 | ||
77 | fCurrentVertex = 0; | |
78 | AliRunLoader *rl =AliRunLoader::Instance(); | |
79 | TArrayF primaryVertex(3); // true vertex | |
80 | AliHeader* header = rl->GetHeader(); | |
81 | AliGenEventHeader* genEventHeader = header->GenEventHeader(); | |
82 | genEventHeader->PrimaryVertex(primaryVertex); | |
83 | ||
84 | // Smearing | |
85 | Double_t vrttrue[3],vrtx[3]; | |
86 | for(Int_t k=0; k<3;k++){ | |
87 | vrttrue[k] = static_cast<Double_t>(primaryVertex[k]); | |
88 | vrtx[k] = gRandom->Gaus(vrttrue[k],fSmear[k]); | |
89 | } | |
90 | fCurrentVertex = new AliESDVertex(vrtx,fSmear,"Smeared Generated Vertex"); | |
91 | fCurrentVertex->SetTitle("vertexer: smearMC"); | |
92 | return fCurrentVertex; | |
93 | ||
94 | } | |
95 | ||
96 | //________________________________________________________ | |
97 | void AliITSVertexerFast::PrintStatus() const { | |
98 | // Print current status | |
99 | cout <<"=======================================================\n"; | |
100 | ||
101 | cout<<"RMS for gaussian smearing: "; | |
102 | for(Int_t k=0;k<3;k++)cout<<" "<<fSmear[k]; | |
103 | cout<<endl; | |
104 | } | |
105 |