AddHeader implemented.
[u/mrichter/AliRoot.git] / EVGEN / AliGenBox.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
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(),
38 fIpart(0)
790bbabf 39{
40 //
41 // Default constructor
42 //
790bbabf 43}
44
45//_____________________________________________________________________________
46AliGenBox::AliGenBox(Int_t npart)
1c56e311 47 :AliGenerator(npart),
48 fIpart(kProton)
790bbabf 49{
50 //
51 // Standard constructor
52 //
8b31bfac 53 fName = "Box";
54 fTitle = "Box particle generator";
790bbabf 55}
56
57//_____________________________________________________________________________
58
59void AliGenBox::Generate()
60{
61 //
62 // Generate one trigger
63 //
64
65 Float_t polar[3]= {0,0,0};
66 //
67 Float_t origin[3];
68 Float_t p[3];
69 Int_t i, j, nt;
70 Double_t pmom, theta, phi, pt;
71 //
72 Float_t random[6];
73 //
74 for (j=0;j<3;j++) origin[j]=fOrigin[j];
aee8290b 75 if(fVertexSmear==kPerEvent) {
c8f7f6f9 76 Vertex();
77 for (j=0;j<3;j++) origin[j]=fVertex[j];
790bbabf 78 }
c8f7f6f9 79
790bbabf 80 for(i=0;i<fNpart;i++) {
65fb704d 81 Rndm(random,3);
790bbabf 82 theta=fThetaMin+random[0]*(fThetaMax-fThetaMin);
83 if(TestBit(kMomentumRange)) {
84 pmom=fPMin+random[1]*(fPMax-fPMin);
85 pt=pmom*TMath::Sin(theta);
86 } else {
87
88 pt=fPtMin+random[1]*(fPtMax-fPtMin);
89 pmom=pt/TMath::Sin(theta);
90 }
91 phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
92 p[0] = pt*TMath::Cos(phi);
93 p[1] = pt*TMath::Sin(phi);
94 p[2] = pmom*TMath::Cos(theta);
95
aee8290b 96 if(fVertexSmear==kPerTrack) {
65fb704d 97 Rndm(random,6);
790bbabf 98 for (j=0;j<3;j++) {
99 origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
100 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
101 }
102 }
642f15cf 103 PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
790bbabf 104 }
42cca6d4 105
106 AliGenEventHeader* header = new AliGenEventHeader("BOX");
107 header->SetPrimaryVertex(fVertex);
108 gAlice->SetGenEventHeader(header);
790bbabf 109}
110
111//_____________________________________________________________________________
112
113void AliGenBox::Init()
114{
115// Initialisation, check consistency of selected ranges
116 if(TestBit(kPtRange)&&TestBit(kMomentumRange))
117 Fatal("Init","You should not set the momentum range and the pt range!\n");
118 if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange)))
119 Fatal("Init","You should set either the momentum or the pt range!\n");
120}
121