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df725edf | 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 | /* | |
17 | $Log$ | |
675e9664 | 18 | Revision 1.5 2000/12/06 15:11:38 morsch |
19 | Correct double declared data members. | |
20 | ||
38f1bd58 | 21 | Revision 1.4 2000/11/30 07:12:50 alibrary |
22 | Introducing new Rndm and QA classes | |
23 | ||
65fb704d | 24 | Revision 1.3 2000/10/02 21:28:06 fca |
25 | Removal of useless dependecies via forward declarations | |
26 | ||
94de3818 | 27 | Revision 1.2 2000/06/09 20:37:51 morsch |
28 | All coding rule violations except RS3 corrected | |
29 | ||
f87cfe57 | 30 | Revision 1.1 2000/02/23 16:25:14 morsch |
31 | First commit of this file | |
32 | ||
df725edf | 33 | */ |
34 | ||
675e9664 | 35 | // As AliGenScan, generation of particles on a 3-dim grid |
36 | // but here double hits with a predefined distance are generated. | |
37 | // The second particle is generated at a constant distance but with random phi. | |
38 | // Generator can be used to evaluate double hit resolutions. | |
39 | // Author: andreas.morsch@cern.ch | |
40 | ||
df725edf | 41 | #include "AliGenDoubleScan.h" |
df725edf | 42 | #include "AliRun.h" |
f87cfe57 | 43 | |
df725edf | 44 | ClassImp(AliGenDoubleScan) |
45 | ||
46 | AliGenDoubleScan::AliGenDoubleScan() | |
47 | :AliGenScan(-1) | |
48 | { | |
49 | } | |
50 | ||
51 | AliGenDoubleScan::AliGenDoubleScan(Int_t npart) | |
52 | :AliGenScan(npart) | |
53 | { | |
f87cfe57 | 54 | // Constructor |
df725edf | 55 | } |
56 | ||
57 | //____________________________________________________________ | |
58 | AliGenDoubleScan::~AliGenDoubleScan() | |
f87cfe57 | 59 | { |
60 | // Destructor | |
61 | } | |
df725edf | 62 | |
63 | //____________________________________________________________ | |
64 | void AliGenDoubleScan::Generate() | |
65 | { | |
f87cfe57 | 66 | // |
67 | // Generate one trigger | |
68 | // | |
df725edf | 69 | |
f87cfe57 | 70 | Float_t polar[3]= {0,0,0}; |
71 | // | |
72 | Float_t origin[3]; | |
73 | Float_t p[3]; | |
74 | Int_t nt; | |
75 | Float_t pmom, theta, phi; | |
76 | // | |
77 | Float_t random[6]; | |
78 | Float_t dx,dy,dz; | |
79 | ||
80 | // | |
81 | if (fNy > 0) { | |
38f1bd58 | 82 | dx=(fXCmax-fXCmin)/fNx; |
f87cfe57 | 83 | } else { |
84 | dx=1e10; | |
85 | } | |
df725edf | 86 | |
f87cfe57 | 87 | if (fNy > 0) { |
38f1bd58 | 88 | dy=(fYCmax-fYCmin)/fNy; |
f87cfe57 | 89 | } else { |
90 | dy=1e10; | |
91 | } | |
92 | ||
93 | if (fNz > 0) { | |
df725edf | 94 | dz=(fZmax-fZmin)/fNz; |
f87cfe57 | 95 | } else { |
96 | dz=1e10; | |
97 | } | |
98 | for (Int_t ix=0; ix<fNx; ix++) { | |
df725edf | 99 | for (Int_t iy=0; iy<fNy; iy++) { |
100 | for (Int_t iz=0; iz<fNz; iz++){ | |
65fb704d | 101 | Rndm(random,6); |
38f1bd58 | 102 | origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0]; |
103 | origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1]; | |
df725edf | 104 | origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2]; |
105 | pmom=fPMin+random[3]*(fPMax-fPMin); | |
106 | theta=fThetaMin+random[4]*(fThetaMax-fThetaMin); | |
107 | phi=fPhiMin+random[5]*(fPhiMax-fPhiMin); | |
108 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
109 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
110 | p[2] = pmom*TMath::Cos(theta); | |
65fb704d | 111 | gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 112 | // |
113 | // Generate 2nd particle at distance fDistance from the first | |
114 | // | |
65fb704d | 115 | Rndm(random,6); |
df725edf | 116 | Float_t phi2=2.*TMath::Pi()*random[0]; |
117 | Float_t dx =fDistance*TMath::Sin(phi2); | |
118 | Float_t dy =fDistance*TMath::Cos(phi2); | |
119 | origin[0]=origin[0]+dx; | |
120 | origin[1]=origin[1]+dy; | |
121 | pmom=fPMin+random[1]*(fPMax-fPMin); | |
122 | theta=fThetaMin+random[2]*(fThetaMax-fThetaMin); | |
123 | phi=fPhiMin+random[3]*(fPhiMax-fPhiMin); | |
124 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
125 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
126 | p[2] = pmom*TMath::Cos(theta); | |
65fb704d | 127 | gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 128 | } |
129 | } | |
130 | } | |
131 | } | |
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