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 1.5 2000/12/21 16:24:06 morsch
19 Coding convention clean-up
21 Revision 1.4 2000/11/30 07:12:49 alibrary
22 Introducing new Rndm and QA classes
24 Revision 1.3 2000/10/02 21:28:06 fca
25 Removal of useless dependecies via forward declarations
27 Revision 1.2 2000/07/11 18:24:55 fca
28 Coding convention corrections + few minor bug fixes
30 Revision 1.1 2000/06/09 20:22:58 morsch
31 Same class as previously in AliSimpleGen.cxx
32 All coding rule violations except RS3 corrected (AM)
38 // Generator for particles in a preset
39 // kinematic range (flat distribution)
40 // Note that for a given theta pt and p are not independent
41 // Range for only one variable (pt or p) should be given.
43 // Comments and suggestions: andreas.morsch@cern.ch
47 <img src="picts/AliGeneratorClass.gif">
50 <font size=+2 color=red>
51 <p>The responsible person for this module is
52 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
58 ///////////////////////////////////////////////////////////////////
60 #include "AliGenBox.h"
67 //_____________________________________________________________________________
68 AliGenBox::AliGenBox()
72 // Default constructor
77 //_____________________________________________________________________________
78 AliGenBox::AliGenBox(Int_t npart)
82 // Standard constructor
85 fTitle="Box particle generator";
86 // Generate Proton by default
90 //_____________________________________________________________________________
92 void AliGenBox::Generate()
95 // Generate one trigger
98 Float_t polar[3]= {0,0,0};
103 Double_t pmom, theta, phi, pt;
107 for (j=0;j<3;j++) origin[j]=fOrigin[j];
108 if(fVertexSmear==kPerEvent) {
111 origin[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
112 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
115 for(i=0;i<fNpart;i++) {
117 theta=fThetaMin+random[0]*(fThetaMax-fThetaMin);
118 if(TestBit(kMomentumRange)) {
119 pmom=fPMin+random[1]*(fPMax-fPMin);
120 pt=pmom*TMath::Sin(theta);
123 pt=fPtMin+random[1]*(fPtMax-fPtMin);
124 pmom=pt/TMath::Sin(theta);
126 phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
127 p[0] = pt*TMath::Cos(phi);
128 p[1] = pt*TMath::Sin(phi);
129 p[2] = pmom*TMath::Cos(theta);
131 if(fVertexSmear==kPerTrack) {
134 origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
135 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
138 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
142 //_____________________________________________________________________________
144 void AliGenBox::Init()
146 // Initialisation, check consistency of selected ranges
147 if(TestBit(kPtRange)&&TestBit(kMomentumRange))
148 Fatal("Init","You should not set the momentum range and the pt range!\n");
149 if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange)))
150 Fatal("Init","You should set either the momentum or the pt range!\n");