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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 | // Simple particle gun. | |
19 | // Momentum, phi and theta of the partice as well as the particle type can be set. | |
20 | // If fExplicit is true the user set momentum vector is used, | |
21 | // otherwise it is calculated. | |
22 | // andreas.morsch@cern.ch | |
23 | ||
24 | #include "TPDGCode.h" | |
25 | ||
26 | #include "AliGenFixed.h" | |
27 | #include "AliRun.h" | |
28 | ||
29 | ClassImp(AliGenFixed) | |
30 | ||
31 | //_____________________________________________________________________________ | |
32 | AliGenFixed::AliGenFixed() | |
33 | :AliGenerator(), | |
34 | fIpart(0), | |
35 | fExplicit(kFALSE) | |
36 | { | |
37 | // | |
38 | // Default constructor | |
39 | // | |
40 | } | |
41 | ||
42 | //_____________________________________________________________________________ | |
43 | AliGenFixed::AliGenFixed(Int_t npart) | |
44 | :AliGenerator(npart), | |
45 | fIpart(kProton), | |
46 | fExplicit(kFALSE) | |
47 | { | |
48 | // | |
49 | // Standard constructor | |
50 | // | |
51 | fName="Fixed"; | |
52 | fTitle="Fixed Particle Generator"; | |
53 | } | |
54 | ||
55 | //_____________________________________________________________________________ | |
56 | void AliGenFixed::Generate() | |
57 | { | |
58 | // | |
59 | // Generate one trigger | |
60 | // | |
61 | Float_t polar[3]= {0,0,0}; | |
62 | if(!fExplicit) { | |
63 | fP[0] = fPMin * TMath::Cos(fPhiMin) * TMath::Sin(fThetaMin); | |
64 | fP[1] = fPMin * TMath::Sin(fPhiMin) * TMath::Sin(fThetaMin); | |
65 | fP[2] = fPMin * TMath::Cos(fThetaMin); | |
66 | } | |
67 | Int_t i, j, nt; | |
68 | // | |
69 | Float_t o[3] = {0., 0., 0.}; | |
70 | if(fVertexSmear == kPerEvent) { | |
71 | Vertex(); | |
72 | for (j = 0;j < 3; j++) o[j] = fVertex[j]; | |
73 | } | |
74 | ||
75 | for(i = 0; i < fNpart; i++) | |
76 | PushTrack(fTrackIt, -1, fIpart, fP, o , polar, 0, kPPrimary, nt); | |
77 | } | |
78 |