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[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$Log$
18*/
19
20#include "AliGenDoubleScan.h"
21#include <stdlib.h>
22#include "AliRun.h"
23 ClassImp(AliGenDoubleScan)
24
25 AliGenDoubleScan::AliGenDoubleScan()
26 :AliGenScan(-1)
27{
28}
29
30AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
31 :AliGenScan(npart)
32{
33}
34
35//____________________________________________________________
36AliGenDoubleScan::~AliGenDoubleScan()
37{}
38
39//____________________________________________________________
40void AliGenDoubleScan::Generate()
41{
42 //
43 // Generate one trigger
44 //
45
46 Float_t polar[3]= {0,0,0};
47 //
48 Float_t origin[3];
49 Float_t p[3];
50 Int_t nt;
51 Float_t pmom, theta, phi;
52 //
53 Float_t random[6];
54 Float_t dx,dy,dz;
55
56 //
57 if (fNy > 0) {
58 dx=(fXmax-fXmin)/fNx;
59 } else {
60 dx=1e10;
61 }
62
63 if (fNy > 0) {
64 dy=(fYmax-fYmin)/fNy;
65 } else {
66 dy=1e10;
67 }
68
69 if (fNz > 0) {
70 dz=(fZmax-fZmin)/fNz;
71 } else {
72 dz=1e10;
73 }
74 for (Int_t ix=0; ix<fNx; ix++) {
75 for (Int_t iy=0; iy<fNy; iy++) {
76 for (Int_t iz=0; iz<fNz; iz++){
77 gMC->Rndm(random,6);
78 origin[0]=fXmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
79 origin[1]=fYmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
80 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
81 pmom=fPMin+random[3]*(fPMax-fPMin);
82 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
83 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
84 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
85 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
86 p[2] = pmom*TMath::Cos(theta);
87 gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,"Primary",nt);
88//
89// Generate 2nd particle at distance fDistance from the first
90//
91 gMC->Rndm(random,6);
92 Float_t phi2=2.*TMath::Pi()*random[0];
93 Float_t dx =fDistance*TMath::Sin(phi2);
94 Float_t dy =fDistance*TMath::Cos(phi2);
95 origin[0]=origin[0]+dx;
96 origin[1]=origin[1]+dy;
97 pmom=fPMin+random[1]*(fPMax-fPMin);
98 theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
99 phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
100 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
101 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
102 p[2] = pmom*TMath::Cos(theta);
103 gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,"Primary",nt);
104 }
105 }
106 }
107}
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