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 1.8 2003/01/14 10:50:18 alibrary
19 Cleanup of STEER coding conventions
21 Revision 1.7 2002/02/08 16:50:50 morsch
22 Add name and title in constructor.
24 Revision 1.6 2001/07/27 17:09:35 morsch
25 Use local SetTrack, KeepTrack and SetHighWaterMark methods
26 to delegate either to local stack or to stack owned by AliRun.
27 (Piotr Skowronski, A.M.)
29 Revision 1.5 2000/12/21 16:24:06 morsch
30 Coding convention clean-up
32 Revision 1.4 2000/11/30 07:12:49 alibrary
33 Introducing new Rndm and QA classes
35 Revision 1.3 2000/10/02 21:28:06 fca
36 Removal of useless dependecies via forward declarations
38 Revision 1.2 2000/07/11 18:24:55 fca
39 Coding convention corrections + few minor bug fixes
41 Revision 1.1 2000/06/09 20:22:58 morsch
42 Same class as previously in AliSimpleGen.cxx
43 All coding rule violations except RS3 corrected (AM)
49 // Generator for particles in a preset
50 // kinematic range (flat distribution)
51 // Note that for a given theta pt and p are not independent
52 // Range for only one variable (pt or p) should be given.
54 // Comments and suggestions: andreas.morsch@cern.ch
58 <img src="picts/AliGeneratorClass.gif">
61 <font size=+2 color=red>
62 <p>The responsible person for this module is
63 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
69 ///////////////////////////////////////////////////////////////////
74 #include "AliGenBox.h"
79 //_____________________________________________________________________________
80 AliGenBox::AliGenBox()
84 // Default constructor
89 //_____________________________________________________________________________
90 AliGenBox::AliGenBox(Int_t npart)
94 // Standard constructor
97 fTitle = "Box particle generator";
98 // Generate Proton by default
102 //_____________________________________________________________________________
104 void AliGenBox::Generate()
107 // Generate one trigger
110 Float_t polar[3]= {0,0,0};
115 Double_t pmom, theta, phi, pt;
119 for (j=0;j<3;j++) origin[j]=fOrigin[j];
120 if(fVertexSmear==kPerEvent) {
122 for (j=0;j<3;j++) origin[j]=fVertex[j];
125 for(i=0;i<fNpart;i++) {
127 theta=fThetaMin+random[0]*(fThetaMax-fThetaMin);
128 if(TestBit(kMomentumRange)) {
129 pmom=fPMin+random[1]*(fPMax-fPMin);
130 pt=pmom*TMath::Sin(theta);
133 pt=fPtMin+random[1]*(fPtMax-fPtMin);
134 pmom=pt/TMath::Sin(theta);
136 phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
137 p[0] = pt*TMath::Cos(phi);
138 p[1] = pt*TMath::Sin(phi);
139 p[2] = pmom*TMath::Cos(theta);
141 if(fVertexSmear==kPerTrack) {
144 origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
145 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
148 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
152 //_____________________________________________________________________________
154 void AliGenBox::Init()
156 // Initialisation, check consistency of selected ranges
157 if(TestBit(kPtRange)&&TestBit(kMomentumRange))
158 Fatal("Init","You should not set the momentum range and the pt range!\n");
159 if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange)))
160 Fatal("Init","You should set either the momentum or the pt range!\n");