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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 | ||
fb17acd4 | 16 | /* $Header$ */ |
c5ca52b2 | 17 | |
18 | #include "AliLegoGeneratorEta.h" | |
19 | #include "AliRun.h" | |
20 | ||
21 | ClassImp(AliLegoGeneratorEta) | |
22 | ||
23 | ||
24 | //___________________________________________ | |
25 | void AliLegoGeneratorEta::Generate() | |
26 | { | |
27 | // Create a geantino with kinematics corresponding to the current bins | |
28 | // Here: Coor1 = eta | |
29 | // Coor2 = phi. | |
30 | ||
31 | // | |
32 | // Rootinos are 0 | |
33 | const Int_t kMpart = 0; | |
34 | Float_t orig[3], pmom[3]; | |
35 | Float_t t, cost, sint, cosp, sinp; | |
36 | if (fCoor1Bin==-1) fCoor1Bin=fNCoor1; | |
37 | // Prepare for next step | |
38 | if(fCoor1Bin>=fNCoor1-1) | |
39 | if(fCoor2Bin>=fNCoor2-1) { | |
40 | Warning("Generate","End of Lego Generation"); | |
41 | return; | |
42 | } else { | |
43 | fCoor2Bin++; | |
10bd7535 | 44 | printf("Generating rays in eta bin:%d\n",fCoor2Bin); |
c5ca52b2 | 45 | fCoor1Bin=0; |
46 | } else fCoor1Bin++; | |
47 | ||
48 | fCurCoor1 = (fCoor1Min+(fCoor1Bin+0.5)*(fCoor1Max-fCoor1Min)/fNCoor1); | |
49 | fCurCoor2 = (fCoor2Min+(fCoor2Bin+0.5)*(fCoor2Max-fCoor2Min)/fNCoor2); | |
50 | ||
10bd7535 | 51 | Float_t phi = fCurCoor1*TMath::Pi()/180.; |
52 | Float_t theta = 2.*TMath::ATan(TMath::Exp(-fCurCoor2)); | |
53 | ||
c5ca52b2 | 54 | |
55 | cost = TMath::Cos(theta); | |
56 | sint = TMath::Sin(theta); | |
57 | cosp = TMath::Cos(phi); | |
58 | sinp = TMath::Sin(phi); | |
59 | ||
60 | pmom[0] = cosp*sint; | |
61 | pmom[1] = sinp*sint; | |
62 | pmom[2] = cost; | |
63 | ||
64 | // --- Where to start | |
65 | orig[0] = orig[1] = orig[2] = 0; | |
66 | Float_t dalicz = 3000; | |
67 | if (fRadMin > 0) { | |
68 | t = PropagateCylinder(orig,pmom,fRadMin,dalicz); | |
69 | orig[0] = pmom[0]*t; | |
70 | orig[1] = pmom[1]*t; | |
71 | orig[2] = pmom[2]*t; | |
72 | if (TMath::Abs(orig[2]) > fZMax) return; | |
73 | } | |
74 | ||
75 | Float_t polar[3]={0.,0.,0.}; | |
76 | Int_t ntr; | |
9e1a0ddb | 77 | gAlice->SetTrack(1, -1, kMpart, pmom, orig, polar, 0, kPPrimary, ntr); |
c5ca52b2 | 78 | |
79 | } |