Coverity fix.
[u/mrichter/AliRoot.git] / EVGEN / AliGenBox.cxx
CommitLineData
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
88cb7938 16/* $Id$ */
790bbabf 17
790bbabf 18
675e9664 19// Generator for particles in a preset
20// kinematic range (flat distribution)
21// Note that for a given theta pt and p are not independent
22// Range for only one variable (pt or p) should be given.
675e9664 23// Comments and suggestions: andreas.morsch@cern.ch
0af12c00 24
790bbabf 25
116cbefd 26#include "TPDGCode.h"
27
28#include "AliConst.h"
790bbabf 29#include "AliGenBox.h"
30#include "AliRun.h"
42cca6d4 31#include "AliGenEventHeader.h"
790bbabf 32
33ClassImp(AliGenBox)
34
35//_____________________________________________________________________________
36AliGenBox::AliGenBox()
1c56e311 37 :AliGenerator(),
a8c51211 38 fIpart(0),
39 fEtaMin(0),
40 fEtaMax(0)
790bbabf 41{
42 //
43 // Default constructor
44 //
790bbabf 45}
46
47//_____________________________________________________________________________
48AliGenBox::AliGenBox(Int_t npart)
1c56e311 49 :AliGenerator(npart),
a8c51211 50 fIpart(kProton),
51 fEtaMin(0),
52 fEtaMax(0)
790bbabf 53{
54 //
55 // Standard constructor
56 //
8b31bfac 57 fName = "Box";
58 fTitle = "Box particle generator";
790bbabf 59}
60
61//_____________________________________________________________________________
62
63void AliGenBox::Generate()
64{
65 //
66 // Generate one trigger
67 //
68
69 Float_t polar[3]= {0,0,0};
70 //
71 Float_t origin[3];
72 Float_t p[3];
73 Int_t i, j, nt;
74 Double_t pmom, theta, phi, pt;
75 //
76 Float_t random[6];
77 //
78 for (j=0;j<3;j++) origin[j]=fOrigin[j];
aee8290b 79 if(fVertexSmear==kPerEvent) {
c8f7f6f9 80 Vertex();
81 for (j=0;j<3;j++) origin[j]=fVertex[j];
790bbabf 82 }
c8f7f6f9 83
790bbabf 84 for(i=0;i<fNpart;i++) {
65fb704d 85 Rndm(random,3);
898bb7f8 86
87 if (TestBit(kThetaRange)) {
88 theta = fThetaMin+random[0]*(fThetaMax-fThetaMin);
89 } else {
90 Float_t eta = fEtaMin+random[0]*(fEtaMax-fEtaMin);
91 theta = 2. * TMath::ATan(TMath::Exp(-eta));
92 }
93
94
790bbabf 95 if(TestBit(kMomentumRange)) {
96 pmom=fPMin+random[1]*(fPMax-fPMin);
97 pt=pmom*TMath::Sin(theta);
98 } else {
99
100 pt=fPtMin+random[1]*(fPtMax-fPtMin);
101 pmom=pt/TMath::Sin(theta);
102 }
898bb7f8 103
790bbabf 104 phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
105 p[0] = pt*TMath::Cos(phi);
106 p[1] = pt*TMath::Sin(phi);
107 p[2] = pmom*TMath::Cos(theta);
108
aee8290b 109 if(fVertexSmear==kPerTrack) {
65fb704d 110 Rndm(random,6);
790bbabf 111 for (j=0;j<3;j++) {
112 origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
113 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
114 }
115 }
642f15cf 116 PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
790bbabf 117 }
42cca6d4 118
119 AliGenEventHeader* header = new AliGenEventHeader("BOX");
120 header->SetPrimaryVertex(fVertex);
7cf36cae 121 header->SetNProduced(fNpart);
122
123 // Passes header either to the container or to gAlice
124 if (fContainer) {
125 fContainer->AddHeader(header);
126 } else {
127 gAlice->SetGenEventHeader(header);
128 }
790bbabf 129}
130
131//_____________________________________________________________________________
132
133void AliGenBox::Init()
134{
135// Initialisation, check consistency of selected ranges
136 if(TestBit(kPtRange)&&TestBit(kMomentumRange))
137 Fatal("Init","You should not set the momentum range and the pt range!\n");
138 if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange)))
139 Fatal("Init","You should set either the momentum or the pt range!\n");
140}
141