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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 | $Log$ | |
b9d0a01d | 18 | Revision 1.8.6.1 2002/07/30 15:00:39 alibrary |
19 | Correction in initialization of dx (Enrique Gamez Flores). | |
20 | ||
21 | Revision 1.9 2002/07/30 13:48:03 morsch | |
22 | ||
23 | Correction in initialization of dx (Enrique Gamez Flores). | |
24 | ||
833149de | 25 | Revision 1.8 2002/02/08 16:50:50 morsch |
26 | Add name and title in constructor. | |
27 | ||
8b31bfac | 28 | Revision 1.7 2001/07/27 17:09:35 morsch |
29 | Use local SetTrack, KeepTrack and SetHighWaterMark methods | |
30 | to delegate either to local stack or to stack owned by AliRun. | |
31 | (Piotr Skowronski, A.M.) | |
32 | ||
a99cf51f | 33 | Revision 1.6 2000/12/21 16:24:06 morsch |
34 | Coding convention clean-up | |
35 | ||
675e9664 | 36 | Revision 1.5 2000/12/06 15:11:38 morsch |
37 | Correct double declared data members. | |
38 | ||
38f1bd58 | 39 | Revision 1.4 2000/11/30 07:12:50 alibrary |
40 | Introducing new Rndm and QA classes | |
41 | ||
65fb704d | 42 | Revision 1.3 2000/10/02 21:28:06 fca |
43 | Removal of useless dependecies via forward declarations | |
44 | ||
94de3818 | 45 | Revision 1.2 2000/06/09 20:37:51 morsch |
46 | All coding rule violations except RS3 corrected | |
47 | ||
f87cfe57 | 48 | Revision 1.1 2000/02/23 16:25:14 morsch |
49 | First commit of this file | |
50 | ||
df725edf | 51 | */ |
52 | ||
675e9664 | 53 | // As AliGenScan, generation of particles on a 3-dim grid |
54 | // but here double hits with a predefined distance are generated. | |
55 | // The second particle is generated at a constant distance but with random phi. | |
56 | // Generator can be used to evaluate double hit resolutions. | |
57 | // Author: andreas.morsch@cern.ch | |
58 | ||
df725edf | 59 | #include "AliGenDoubleScan.h" |
df725edf | 60 | #include "AliRun.h" |
f87cfe57 | 61 | |
df725edf | 62 | ClassImp(AliGenDoubleScan) |
63 | ||
64 | AliGenDoubleScan::AliGenDoubleScan() | |
65 | :AliGenScan(-1) | |
66 | { | |
67 | } | |
68 | ||
69 | AliGenDoubleScan::AliGenDoubleScan(Int_t npart) | |
70 | :AliGenScan(npart) | |
71 | { | |
f87cfe57 | 72 | // Constructor |
8b31bfac | 73 | fName = "Double Scan"; |
74 | fTitle= "Particle Generator for two correlated particles on a grid"; | |
df725edf | 75 | } |
76 | ||
77 | //____________________________________________________________ | |
78 | AliGenDoubleScan::~AliGenDoubleScan() | |
f87cfe57 | 79 | { |
80 | // Destructor | |
81 | } | |
df725edf | 82 | |
83 | //____________________________________________________________ | |
84 | void AliGenDoubleScan::Generate() | |
85 | { | |
f87cfe57 | 86 | // |
87 | // Generate one trigger | |
88 | // | |
df725edf | 89 | |
f87cfe57 | 90 | Float_t polar[3]= {0,0,0}; |
91 | // | |
92 | Float_t origin[3]; | |
93 | Float_t p[3]; | |
94 | Int_t nt; | |
95 | Float_t pmom, theta, phi; | |
96 | // | |
97 | Float_t random[6]; | |
98 | Float_t dx,dy,dz; | |
99 | ||
100 | // | |
833149de | 101 | if (fNx > 0) { |
38f1bd58 | 102 | dx=(fXCmax-fXCmin)/fNx; |
f87cfe57 | 103 | } else { |
104 | dx=1e10; | |
105 | } | |
df725edf | 106 | |
f87cfe57 | 107 | if (fNy > 0) { |
38f1bd58 | 108 | dy=(fYCmax-fYCmin)/fNy; |
f87cfe57 | 109 | } else { |
110 | dy=1e10; | |
111 | } | |
112 | ||
113 | if (fNz > 0) { | |
df725edf | 114 | dz=(fZmax-fZmin)/fNz; |
f87cfe57 | 115 | } else { |
116 | dz=1e10; | |
117 | } | |
118 | for (Int_t ix=0; ix<fNx; ix++) { | |
df725edf | 119 | for (Int_t iy=0; iy<fNy; iy++) { |
120 | for (Int_t iz=0; iz<fNz; iz++){ | |
65fb704d | 121 | Rndm(random,6); |
38f1bd58 | 122 | origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0]; |
123 | origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1]; | |
df725edf | 124 | origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2]; |
125 | pmom=fPMin+random[3]*(fPMax-fPMin); | |
126 | theta=fThetaMin+random[4]*(fThetaMax-fThetaMin); | |
127 | phi=fPhiMin+random[5]*(fPhiMax-fPhiMin); | |
128 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
129 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
130 | p[2] = pmom*TMath::Cos(theta); | |
a99cf51f | 131 | SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 132 | // |
133 | // Generate 2nd particle at distance fDistance from the first | |
134 | // | |
65fb704d | 135 | Rndm(random,6); |
df725edf | 136 | Float_t phi2=2.*TMath::Pi()*random[0]; |
137 | Float_t dx =fDistance*TMath::Sin(phi2); | |
138 | Float_t dy =fDistance*TMath::Cos(phi2); | |
139 | origin[0]=origin[0]+dx; | |
140 | origin[1]=origin[1]+dy; | |
141 | pmom=fPMin+random[1]*(fPMax-fPMin); | |
142 | theta=fThetaMin+random[2]*(fThetaMax-fThetaMin); | |
143 | phi=fPhiMin+random[3]*(fPhiMax-fPhiMin); | |
144 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
145 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
146 | p[2] = pmom*TMath::Cos(theta); | |
a99cf51f | 147 | SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 148 | } |
149 | } | |
150 | } | |
151 | } | |
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