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 2000/12/21 16:24:06 morsch
19 Coding convention clean-up
21 Revision 1.5 2000/12/06 15:11:38 morsch
22 Correct double declared data members.
24 Revision 1.4 2000/11/30 07:12:50 alibrary
25 Introducing new Rndm and QA classes
27 Revision 1.3 2000/10/02 21:28:06 fca
28 Removal of useless dependecies via forward declarations
30 Revision 1.2 2000/06/09 20:37:51 morsch
31 All coding rule violations except RS3 corrected
33 Revision 1.1 2000/02/23 16:25:14 morsch
34 First commit of this file
38 // As AliGenScan, generation of particles on a 3-dim grid
39 // but here double hits with a predefined distance are generated.
40 // The second particle is generated at a constant distance but with random phi.
41 // Generator can be used to evaluate double hit resolutions.
42 // Author: andreas.morsch@cern.ch
44 #include "AliGenDoubleScan.h"
47 ClassImp(AliGenDoubleScan)
49 AliGenDoubleScan::AliGenDoubleScan()
54 AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
60 //____________________________________________________________
61 AliGenDoubleScan::~AliGenDoubleScan()
66 //____________________________________________________________
67 void AliGenDoubleScan::Generate()
70 // Generate one trigger
73 Float_t polar[3]= {0,0,0};
78 Float_t pmom, theta, phi;
85 dx=(fXCmax-fXCmin)/fNx;
91 dy=(fYCmax-fYCmin)/fNy;
101 for (Int_t ix=0; ix<fNx; ix++) {
102 for (Int_t iy=0; iy<fNy; iy++) {
103 for (Int_t iz=0; iz<fNz; iz++){
105 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
106 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
107 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
108 pmom=fPMin+random[3]*(fPMax-fPMin);
109 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
110 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
111 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
112 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
113 p[2] = pmom*TMath::Cos(theta);
114 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
116 // Generate 2nd particle at distance fDistance from the first
119 Float_t phi2=2.*TMath::Pi()*random[0];
120 Float_t dx =fDistance*TMath::Sin(phi2);
121 Float_t dy =fDistance*TMath::Cos(phi2);
122 origin[0]=origin[0]+dx;
123 origin[1]=origin[1]+dy;
124 pmom=fPMin+random[1]*(fPMax-fPMin);
125 theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
126 phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
127 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
128 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
129 p[2] = pmom*TMath::Cos(theta);
130 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);