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