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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 | $Log$ | |
833149de | 18 | Revision 1.8 2002/02/08 16:50:50 morsch |
19 | Add name and title in constructor. | |
20 | ||
8b31bfac | 21 | Revision 1.7 2001/07/27 17:09:35 morsch |
22 | Use local SetTrack, KeepTrack and SetHighWaterMark methods | |
23 | to delegate either to local stack or to stack owned by AliRun. | |
24 | (Piotr Skowronski, A.M.) | |
25 | ||
a99cf51f | 26 | Revision 1.6 2000/12/21 16:24:06 morsch |
27 | Coding convention clean-up | |
28 | ||
675e9664 | 29 | Revision 1.5 2000/12/06 15:11:38 morsch |
30 | Correct double declared data members. | |
31 | ||
38f1bd58 | 32 | Revision 1.4 2000/11/30 07:12:50 alibrary |
33 | Introducing new Rndm and QA classes | |
34 | ||
65fb704d | 35 | Revision 1.3 2000/10/02 21:28:06 fca |
36 | Removal of useless dependecies via forward declarations | |
37 | ||
94de3818 | 38 | Revision 1.2 2000/06/09 20:37:51 morsch |
39 | All coding rule violations except RS3 corrected | |
40 | ||
f87cfe57 | 41 | Revision 1.1 2000/02/23 16:25:14 morsch |
42 | First commit of this file | |
43 | ||
df725edf | 44 | */ |
45 | ||
675e9664 | 46 | // As AliGenScan, generation of particles on a 3-dim grid |
47 | // but here double hits with a predefined distance are generated. | |
48 | // The second particle is generated at a constant distance but with random phi. | |
49 | // Generator can be used to evaluate double hit resolutions. | |
50 | // Author: andreas.morsch@cern.ch | |
51 | ||
df725edf | 52 | #include "AliGenDoubleScan.h" |
df725edf | 53 | #include "AliRun.h" |
f87cfe57 | 54 | |
df725edf | 55 | ClassImp(AliGenDoubleScan) |
56 | ||
57 | AliGenDoubleScan::AliGenDoubleScan() | |
58 | :AliGenScan(-1) | |
59 | { | |
60 | } | |
61 | ||
62 | AliGenDoubleScan::AliGenDoubleScan(Int_t npart) | |
63 | :AliGenScan(npart) | |
64 | { | |
f87cfe57 | 65 | // Constructor |
8b31bfac | 66 | fName = "Double Scan"; |
67 | fTitle= "Particle Generator for two correlated particles on a grid"; | |
df725edf | 68 | } |
69 | ||
70 | //____________________________________________________________ | |
71 | AliGenDoubleScan::~AliGenDoubleScan() | |
f87cfe57 | 72 | { |
73 | // Destructor | |
74 | } | |
df725edf | 75 | |
76 | //____________________________________________________________ | |
77 | void AliGenDoubleScan::Generate() | |
78 | { | |
f87cfe57 | 79 | // |
80 | // Generate one trigger | |
81 | // | |
df725edf | 82 | |
f87cfe57 | 83 | Float_t polar[3]= {0,0,0}; |
84 | // | |
85 | Float_t origin[3]; | |
86 | Float_t p[3]; | |
87 | Int_t nt; | |
88 | Float_t pmom, theta, phi; | |
89 | // | |
90 | Float_t random[6]; | |
91 | Float_t dx,dy,dz; | |
92 | ||
93 | // | |
833149de | 94 | if (fNx > 0) { |
38f1bd58 | 95 | dx=(fXCmax-fXCmin)/fNx; |
f87cfe57 | 96 | } else { |
97 | dx=1e10; | |
98 | } | |
df725edf | 99 | |
f87cfe57 | 100 | if (fNy > 0) { |
38f1bd58 | 101 | dy=(fYCmax-fYCmin)/fNy; |
f87cfe57 | 102 | } else { |
103 | dy=1e10; | |
104 | } | |
105 | ||
106 | if (fNz > 0) { | |
df725edf | 107 | dz=(fZmax-fZmin)/fNz; |
f87cfe57 | 108 | } else { |
109 | dz=1e10; | |
110 | } | |
111 | for (Int_t ix=0; ix<fNx; ix++) { | |
df725edf | 112 | for (Int_t iy=0; iy<fNy; iy++) { |
113 | for (Int_t iz=0; iz<fNz; iz++){ | |
65fb704d | 114 | Rndm(random,6); |
38f1bd58 | 115 | origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0]; |
116 | origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1]; | |
df725edf | 117 | origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2]; |
118 | pmom=fPMin+random[3]*(fPMax-fPMin); | |
119 | theta=fThetaMin+random[4]*(fThetaMax-fThetaMin); | |
120 | phi=fPhiMin+random[5]*(fPhiMax-fPhiMin); | |
121 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
122 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
123 | p[2] = pmom*TMath::Cos(theta); | |
a99cf51f | 124 | SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 125 | // |
126 | // Generate 2nd particle at distance fDistance from the first | |
127 | // | |
65fb704d | 128 | Rndm(random,6); |
df725edf | 129 | Float_t phi2=2.*TMath::Pi()*random[0]; |
130 | Float_t dx =fDistance*TMath::Sin(phi2); | |
131 | Float_t dy =fDistance*TMath::Cos(phi2); | |
132 | origin[0]=origin[0]+dx; | |
133 | origin[1]=origin[1]+dy; | |
134 | pmom=fPMin+random[1]*(fPMax-fPMin); | |
135 | theta=fThetaMin+random[2]*(fThetaMax-fThetaMin); | |
136 | phi=fPhiMin+random[3]*(fPhiMax-fPhiMin); | |
137 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
138 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
139 | p[2] = pmom*TMath::Cos(theta); | |
a99cf51f | 140 | SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 141 | } |
142 | } | |
143 | } | |
144 | } | |
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