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 // Realisation of AliGenerator that generates particles with
19 // vertices on a user defined grid.
20 // The vertex positions can be smeared.
21 // Momentum vectors are defined through the methods provided by AliGenerator.
22 // Author: andreas.morsch@cern.ch
24 #include "AliGenScan.h"
29 AliGenScan::AliGenScan()
47 AliGenScan::AliGenScan(Int_t npart)
52 fTitle = "Generator for particles on a grid";
66 //____________________________________________________________
67 AliGenScan::~AliGenScan()
72 void AliGenScan::SetRange(Int_t nx, Float_t xmin, Float_t xmax,
73 Int_t ny, Float_t ymin, Float_t ymax,
74 Int_t nz, Float_t zmin, Float_t zmax)
88 //____________________________________________________________
89 void AliGenScan::Generate()
92 // Generate one trigger
95 Float_t polar[3]= {0,0,0};
100 Float_t pmom, theta, phi;
107 dx=(fXCmax-fXCmin)/fNx;
113 dy=(fYCmax-fYCmin)/fNy;
119 dz=(fZmax-fZmin)/fNz;
123 for (Int_t ix=0; ix<fNx; ix++) {
124 for (Int_t iy=0; iy<fNy; iy++) {
125 for (Int_t iz=0; iz<fNz; iz++){
127 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
128 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
129 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
130 pmom=fPMin+random[3]*(fPMax-fPMin);
131 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
132 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
133 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
134 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
135 p[2] = pmom*TMath::Cos(theta);
136 PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);