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c5ca52b2 | 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 | $Log$ | |
10bd7535 | 18 | Revision 1.2 2000/11/30 07:12:49 alibrary |
19 | Introducing new Rndm and QA classes | |
20 | ||
65fb704d | 21 | Revision 1.1 2000/10/26 14:18:05 morsch |
22 | Add new AliLegoGenerator classes: | |
23 | AliLegoGeneratorXYZ: carthesian binning | |
24 | AliLegoGeneratorEta: eta-phi binning | |
25 | ||
c5ca52b2 | 26 | */ |
27 | ||
28 | #include "AliLegoGeneratorEta.h" | |
29 | #include "AliRun.h" | |
30 | ||
31 | ClassImp(AliLegoGeneratorEta) | |
32 | ||
33 | ||
34 | //___________________________________________ | |
35 | void AliLegoGeneratorEta::Generate() | |
36 | { | |
37 | // Create a geantino with kinematics corresponding to the current bins | |
38 | // Here: Coor1 = eta | |
39 | // Coor2 = phi. | |
40 | ||
41 | // | |
42 | // Rootinos are 0 | |
43 | const Int_t kMpart = 0; | |
44 | Float_t orig[3], pmom[3]; | |
45 | Float_t t, cost, sint, cosp, sinp; | |
46 | if (fCoor1Bin==-1) fCoor1Bin=fNCoor1; | |
47 | // Prepare for next step | |
48 | if(fCoor1Bin>=fNCoor1-1) | |
49 | if(fCoor2Bin>=fNCoor2-1) { | |
50 | Warning("Generate","End of Lego Generation"); | |
51 | return; | |
52 | } else { | |
53 | fCoor2Bin++; | |
10bd7535 | 54 | printf("Generating rays in eta bin:%d\n",fCoor2Bin); |
c5ca52b2 | 55 | fCoor1Bin=0; |
56 | } else fCoor1Bin++; | |
57 | ||
58 | fCurCoor1 = (fCoor1Min+(fCoor1Bin+0.5)*(fCoor1Max-fCoor1Min)/fNCoor1); | |
59 | fCurCoor2 = (fCoor2Min+(fCoor2Bin+0.5)*(fCoor2Max-fCoor2Min)/fNCoor2); | |
60 | ||
10bd7535 | 61 | Float_t phi = fCurCoor1*TMath::Pi()/180.; |
62 | Float_t theta = 2.*TMath::ATan(TMath::Exp(-fCurCoor2)); | |
63 | ||
c5ca52b2 | 64 | |
65 | cost = TMath::Cos(theta); | |
66 | sint = TMath::Sin(theta); | |
67 | cosp = TMath::Cos(phi); | |
68 | sinp = TMath::Sin(phi); | |
69 | ||
70 | pmom[0] = cosp*sint; | |
71 | pmom[1] = sinp*sint; | |
72 | pmom[2] = cost; | |
73 | ||
74 | // --- Where to start | |
75 | orig[0] = orig[1] = orig[2] = 0; | |
76 | Float_t dalicz = 3000; | |
77 | if (fRadMin > 0) { | |
78 | t = PropagateCylinder(orig,pmom,fRadMin,dalicz); | |
79 | orig[0] = pmom[0]*t; | |
80 | orig[1] = pmom[1]*t; | |
81 | orig[2] = pmom[2]*t; | |
82 | if (TMath::Abs(orig[2]) > fZMax) return; | |
83 | } | |
84 | ||
85 | Float_t polar[3]={0.,0.,0.}; | |
86 | Int_t ntr; | |
65fb704d | 87 | gAlice->SetTrack(1, 0, kMpart, pmom, orig, polar, 0, kPPrimary, ntr); |
c5ca52b2 | 88 | |
89 | } |