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[u/mrichter/AliRoot.git] / EVGEN / AliGenFixed.cxx
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790bbabf 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
803d1ab0 16/* $Id$ */
675e9664 17
18// Simple particle gun.
19// Momentum, phi and theta of the partice as well as the particle type can be set.
0af12c00 20// If fExplicit is true the user set momentum vector is used,
21// otherwise it is calculated.
675e9664 22// andreas.morsch@cern.ch
790bbabf 23
116cbefd 24#include "TPDGCode.h"
25
790bbabf 26#include "AliGenFixed.h"
27#include "AliRun.h"
790bbabf 28
29ClassImp(AliGenFixed)
30
31//_____________________________________________________________________________
32AliGenFixed::AliGenFixed()
1c56e311 33 :AliGenerator(),
34 fIpart(0),
35 fExplicit(kFALSE)
790bbabf 36{
37 //
38 // Default constructor
39 //
790bbabf 40}
41
42//_____________________________________________________________________________
43AliGenFixed::AliGenFixed(Int_t npart)
1c56e311 44 :AliGenerator(npart),
45 fIpart(kProton),
46 fExplicit(kFALSE)
790bbabf 47{
48 //
49 // Standard constructor
50 //
51 fName="Fixed";
52 fTitle="Fixed Particle Generator";
790bbabf 53}
54
55//_____________________________________________________________________________
56void AliGenFixed::Generate()
57{
58 //
59 // Generate one trigger
60 //
61 Float_t polar[3]= {0,0,0};
f1f30542 62 if(!fExplicit) {
159fe911 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);
f1f30542 66 }
159fe911 67 Int_t i, j, nt;
790bbabf 68 //
9674ec64 69 Float_t o[3] = {0., 0., 0.};
159fe911 70 if(fVertexSmear == kPerEvent) {
71 Vertex();
72 for (j = 0;j < 3; j++) o[j] = fVertex[j];
73 }
1c56e311 74
159fe911 75 for(i = 0; i < fNpart; i++)
76 PushTrack(fTrackIt, -1, fIpart, fP, o , polar, 0, kPPrimary, nt);
790bbabf 77}
78