Resolving all symbols in the library
[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
88cb7938 16/* $Id$ */
df725edf 17
675e9664 18// As AliGenScan, generation of particles on a 3-dim grid
19// but here double hits with a predefined distance are generated.
20// The second particle is generated at a constant distance but with random phi.
21// Generator can be used to evaluate double hit resolutions.
22// Author: andreas.morsch@cern.ch
23
df725edf 24#include "AliGenDoubleScan.h"
df725edf 25#include "AliRun.h"
f87cfe57 26
df725edf 27 ClassImp(AliGenDoubleScan)
28
29 AliGenDoubleScan::AliGenDoubleScan()
1c56e311 30 :AliGenScan(-1),
31 fDistance(0.)
df725edf 32{
1c56e311 33 // Default constructor
df725edf 34}
35
36AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
1c56e311 37 :AliGenScan(npart),
38 fDistance(0.)
df725edf 39{
f87cfe57 40// Constructor
8b31bfac 41 fName = "Double Scan";
42 fTitle= "Particle Generator for two correlated particles on a grid";
df725edf 43}
44
45//____________________________________________________________
46AliGenDoubleScan::~AliGenDoubleScan()
f87cfe57 47{
48// Destructor
49}
df725edf 50
51//____________________________________________________________
52void AliGenDoubleScan::Generate()
53{
f87cfe57 54 //
55 // Generate one trigger
56 //
df725edf 57
f87cfe57 58 Float_t polar[3]= {0,0,0};
59 //
60 Float_t origin[3];
61 Float_t p[3];
62 Int_t nt;
63 Float_t pmom, theta, phi;
64 //
65 Float_t random[6];
66 Float_t dx,dy,dz;
67
68 //
833149de 69 if (fNx > 0) {
38f1bd58 70 dx=(fXCmax-fXCmin)/fNx;
f87cfe57 71 } else {
72 dx=1e10;
73 }
df725edf 74
f87cfe57 75 if (fNy > 0) {
38f1bd58 76 dy=(fYCmax-fYCmin)/fNy;
f87cfe57 77 } else {
78 dy=1e10;
79 }
80
81 if (fNz > 0) {
df725edf 82 dz=(fZmax-fZmin)/fNz;
f87cfe57 83 } else {
84 dz=1e10;
85 }
86 for (Int_t ix=0; ix<fNx; ix++) {
df725edf 87 for (Int_t iy=0; iy<fNy; iy++) {
88 for (Int_t iz=0; iz<fNz; iz++){
65fb704d 89 Rndm(random,6);
38f1bd58 90 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
91 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
df725edf 92 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
93 pmom=fPMin+random[3]*(fPMax-fPMin);
94 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
95 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
96 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
97 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
98 p[2] = pmom*TMath::Cos(theta);
642f15cf 99 PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
df725edf 100//
101// Generate 2nd particle at distance fDistance from the first
102//
65fb704d 103 Rndm(random,6);
df725edf 104 Float_t phi2=2.*TMath::Pi()*random[0];
ea79897e 105 Float_t dx2 =fDistance*TMath::Sin(phi2);
106 Float_t dy2 =fDistance*TMath::Cos(phi2);
107 origin[0]=origin[0]+dx2;
108 origin[1]=origin[1]+dy2;
df725edf 109 pmom=fPMin+random[1]*(fPMax-fPMin);
110 theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
111 phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
112 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
113 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
114 p[2] = pmom*TMath::Cos(theta);
642f15cf 115 PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
df725edf 116 }
117 }
118 }
119}
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