1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.6 2001/07/27 17:09:35 morsch
19 Use local SetTrack, KeepTrack and SetHighWaterMark methods
20 to delegate either to local stack or to stack owned by AliRun.
21 (Piotr Skowronski, A.M.)
23 Revision 1.5 2000/12/21 16:24:06 morsch
24 Coding convention clean-up
26 Revision 1.4 2000/11/30 07:12:49 alibrary
27 Introducing new Rndm and QA classes
29 Revision 1.3 2000/10/02 21:28:06 fca
30 Removal of useless dependecies via forward declarations
32 Revision 1.2 2000/07/11 18:24:55 fca
33 Coding convention corrections + few minor bug fixes
35 Revision 1.1 2000/06/09 20:22:58 morsch
36 Same class as previously in AliSimpleGen.cxx
37 All coding rule violations except RS3 corrected (AM)
43 // Generator for particles in a preset
44 // kinematic range (flat distribution)
45 // Note that for a given theta pt and p are not independent
46 // Range for only one variable (pt or p) should be given.
48 // Comments and suggestions: andreas.morsch@cern.ch
52 <img src="picts/AliGeneratorClass.gif">
55 <font size=+2 color=red>
56 <p>The responsible person for this module is
57 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
63 ///////////////////////////////////////////////////////////////////
65 #include "AliGenBox.h"
72 //_____________________________________________________________________________
73 AliGenBox::AliGenBox()
77 // Default constructor
82 //_____________________________________________________________________________
83 AliGenBox::AliGenBox(Int_t npart)
87 // Standard constructor
90 fTitle = "Box particle generator";
91 // Generate Proton by default
95 //_____________________________________________________________________________
97 void AliGenBox::Generate()
100 // Generate one trigger
103 Float_t polar[3]= {0,0,0};
108 Double_t pmom, theta, phi, pt;
112 for (j=0;j<3;j++) origin[j]=fOrigin[j];
113 if(fVertexSmear==kPerEvent) {
116 origin[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
117 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
120 for(i=0;i<fNpart;i++) {
122 theta=fThetaMin+random[0]*(fThetaMax-fThetaMin);
123 if(TestBit(kMomentumRange)) {
124 pmom=fPMin+random[1]*(fPMax-fPMin);
125 pt=pmom*TMath::Sin(theta);
128 pt=fPtMin+random[1]*(fPtMax-fPtMin);
129 pmom=pt/TMath::Sin(theta);
131 phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
132 p[0] = pt*TMath::Cos(phi);
133 p[1] = pt*TMath::Sin(phi);
134 p[2] = pmom*TMath::Cos(theta);
136 if(fVertexSmear==kPerTrack) {
139 origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
140 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
143 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
147 //_____________________________________________________________________________
149 void AliGenBox::Init()
151 // Initialisation, check consistency of selected ranges
152 if(TestBit(kPtRange)&&TestBit(kMomentumRange))
153 Fatal("Init","You should not set the momentum range and the pt range!\n");
154 if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange)))
155 Fatal("Init","You should set either the momentum or the pt range!\n");