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"
28 AliGenScan::AliGenScan()
47 AliGenScan::AliGenScan(Int_t npart)
62 fTitle = "Generator for particles on a grid";
65 //____________________________________________________________
66 AliGenScan::~AliGenScan()
71 void AliGenScan::SetRange(Int_t nx, Float_t xmin, Float_t xmax,
72 Int_t ny, Float_t ymin, Float_t ymax,
73 Int_t nz, Float_t zmin, Float_t zmax)
87 //____________________________________________________________
88 void AliGenScan::Generate()
91 // Generate one trigger
94 Float_t polar[3]= {0,0,0};
99 Float_t pmom, theta, phi;
106 dx=(fXCmax-fXCmin)/fNx;
112 dy=(fYCmax-fYCmin)/fNy;
118 dz=(fZmax-fZmin)/fNz;
122 for (Int_t ix=0; ix<fNx; ix++) {
123 for (Int_t iy=0; iy<fNy; iy++) {
124 for (Int_t iz=0; iz<fNz; iz++){
126 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
127 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
128 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
129 pmom=fPMin+random[3]*(fPMax-fPMin);
130 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
131 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
132 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
133 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
134 p[2] = pmom*TMath::Cos(theta);
135 PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);