Update of SSD simulation and reconstruction code by Boris and Enrico.
[u/mrichter/AliRoot.git] / EVGEN / AliGenDoubleScan.cxx
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df725edf 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
16/*
17$Log$
675e9664 18Revision 1.5 2000/12/06 15:11:38 morsch
19Correct double declared data members.
20
38f1bd58 21Revision 1.4 2000/11/30 07:12:50 alibrary
22Introducing new Rndm and QA classes
23
65fb704d 24Revision 1.3 2000/10/02 21:28:06 fca
25Removal of useless dependecies via forward declarations
26
94de3818 27Revision 1.2 2000/06/09 20:37:51 morsch
28All coding rule violations except RS3 corrected
29
f87cfe57 30Revision 1.1 2000/02/23 16:25:14 morsch
31First commit of this file
32
df725edf 33*/
34
675e9664 35// As AliGenScan, generation of particles on a 3-dim grid
36// but here double hits with a predefined distance are generated.
37// The second particle is generated at a constant distance but with random phi.
38// Generator can be used to evaluate double hit resolutions.
39// Author: andreas.morsch@cern.ch
40
df725edf 41#include "AliGenDoubleScan.h"
df725edf 42#include "AliRun.h"
f87cfe57 43
df725edf 44 ClassImp(AliGenDoubleScan)
45
46 AliGenDoubleScan::AliGenDoubleScan()
47 :AliGenScan(-1)
48{
49}
50
51AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
52 :AliGenScan(npart)
53{
f87cfe57 54// Constructor
df725edf 55}
56
57//____________________________________________________________
58AliGenDoubleScan::~AliGenDoubleScan()
f87cfe57 59{
60// Destructor
61}
df725edf 62
63//____________________________________________________________
64void AliGenDoubleScan::Generate()
65{
f87cfe57 66 //
67 // Generate one trigger
68 //
df725edf 69
f87cfe57 70 Float_t polar[3]= {0,0,0};
71 //
72 Float_t origin[3];
73 Float_t p[3];
74 Int_t nt;
75 Float_t pmom, theta, phi;
76 //
77 Float_t random[6];
78 Float_t dx,dy,dz;
79
80 //
81 if (fNy > 0) {
38f1bd58 82 dx=(fXCmax-fXCmin)/fNx;
f87cfe57 83 } else {
84 dx=1e10;
85 }
df725edf 86
f87cfe57 87 if (fNy > 0) {
38f1bd58 88 dy=(fYCmax-fYCmin)/fNy;
f87cfe57 89 } else {
90 dy=1e10;
91 }
92
93 if (fNz > 0) {
df725edf 94 dz=(fZmax-fZmin)/fNz;
f87cfe57 95 } else {
96 dz=1e10;
97 }
98 for (Int_t ix=0; ix<fNx; ix++) {
df725edf 99 for (Int_t iy=0; iy<fNy; iy++) {
100 for (Int_t iz=0; iz<fNz; iz++){
65fb704d 101 Rndm(random,6);
38f1bd58 102 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
103 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
df725edf 104 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
105 pmom=fPMin+random[3]*(fPMax-fPMin);
106 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
107 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
108 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
109 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
110 p[2] = pmom*TMath::Cos(theta);
65fb704d 111 gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
df725edf 112//
113// Generate 2nd particle at distance fDistance from the first
114//
65fb704d 115 Rndm(random,6);
df725edf 116 Float_t phi2=2.*TMath::Pi()*random[0];
117 Float_t dx =fDistance*TMath::Sin(phi2);
118 Float_t dy =fDistance*TMath::Cos(phi2);
119 origin[0]=origin[0]+dx;
120 origin[1]=origin[1]+dy;
121 pmom=fPMin+random[1]*(fPMax-fPMin);
122 theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
123 phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
124 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
125 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
126 p[2] = pmom*TMath::Cos(theta);
65fb704d 127 gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
df725edf 128 }
129 }
130 }
131}
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