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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 | // Realisation of AliGenerator that generates particles with | |
19 | // vertices on a user defined grid. | |
20 | // The vertex positions can be smeared. | |
21 | // Momentum vectors are defined through the methods provided by AliGenerator. | |
22 | // Author: andreas.morsch@cern.ch | |
23 | ||
24 | #include "AliGenScan.h" | |
25 | #include "AliRun.h" | |
26 | ||
27 | ClassImp(AliGenScan) | |
28 | ||
29 | AliGenScan::AliGenScan() | |
30 | :AliGenerator(-1) | |
31 | { | |
32 | // Constructor | |
33 | fXCmin=0; | |
34 | fXCmax=0; | |
35 | fNx=1; | |
36 | fYCmin=0; | |
37 | fYCmax=0; | |
38 | fNy=1; | |
39 | fZmin=0; | |
40 | fZmax=0; | |
41 | fNz=1; | |
42 | // | |
43 | // Read all particles | |
44 | fNpart=-1; | |
45 | } | |
46 | ||
47 | AliGenScan::AliGenScan(Int_t npart) | |
48 | :AliGenerator(npart) | |
49 | { | |
50 | // Constructor | |
51 | fName = "Scan"; | |
52 | fTitle = "Generator for particles on a grid"; | |
53 | ||
54 | ||
55 | fXCmin=0; | |
56 | fXCmax=0; | |
57 | fNx=1; | |
58 | fYCmin=0; | |
59 | fYCmax=0; | |
60 | fNy=1; | |
61 | fZmin=0; | |
62 | fZmax=0; | |
63 | fNz=1; | |
64 | } | |
65 | ||
66 | //____________________________________________________________ | |
67 | AliGenScan::~AliGenScan() | |
68 | { | |
69 | // Destructor | |
70 | } | |
71 | ||
72 | void AliGenScan::SetRange(Int_t nx, Float_t xmin, Float_t xmax, | |
73 | Int_t ny, Float_t ymin, Float_t ymax, | |
74 | Int_t nz, Float_t zmin, Float_t zmax) | |
75 | { | |
76 | // Define the grid | |
77 | fXCmin=xmin; | |
78 | fXCmax=xmax; | |
79 | fNx=nx; | |
80 | fYCmin=ymin; | |
81 | fYCmax=ymax; | |
82 | fNy=ny; | |
83 | fZmin=zmin; | |
84 | fZmax=zmax; | |
85 | fNz=nz; | |
86 | } | |
87 | ||
88 | //____________________________________________________________ | |
89 | void AliGenScan::Generate() | |
90 | { | |
91 | // | |
92 | // Generate one trigger | |
93 | // | |
94 | ||
95 | Float_t polar[3]= {0,0,0}; | |
96 | // | |
97 | Float_t origin[3]; | |
98 | Float_t p[3]; | |
99 | Int_t nt; | |
100 | Float_t pmom, theta, phi; | |
101 | // | |
102 | Float_t random[6]; | |
103 | Float_t dx,dy,dz; | |
104 | ||
105 | // | |
106 | if (fNx > 0) { | |
107 | dx=(fXCmax-fXCmin)/fNx; | |
108 | } else { | |
109 | dx=1e10; | |
110 | } | |
111 | ||
112 | if (fNy > 0) { | |
113 | dy=(fYCmax-fYCmin)/fNy; | |
114 | } else { | |
115 | dy=1e10; | |
116 | } | |
117 | ||
118 | if (fNz > 0) { | |
119 | dz=(fZmax-fZmin)/fNz; | |
120 | } else { | |
121 | dz=1e10; | |
122 | } | |
123 | for (Int_t ix=0; ix<fNx; ix++) { | |
124 | for (Int_t iy=0; iy<fNy; iy++) { | |
125 | for (Int_t iz=0; iz<fNz; iz++){ | |
126 | Rndm(random,6); | |
127 | origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0]; | |
128 | origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1]; | |
129 | origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2]; | |
130 | pmom=fPMin+random[3]*(fPMax-fPMin); | |
131 | theta=fThetaMin+random[4]*(fThetaMax-fThetaMin); | |
132 | phi=fPhiMin+random[5]*(fPhiMax-fPhiMin); | |
133 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
134 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
135 | p[2] = pmom*TMath::Cos(theta); | |
136 | PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); | |
137 | } | |
138 | } | |
139 | } | |
140 | } | |
141 | ||
142 | ||
143 | ||
144 | ||
145 | ||
146 | ||
147 | ||
148 | ||
149 |