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[u/mrichter/AliRoot.git] / HMPID / AliHMPIDDigit.h
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d3da6dc4 1#ifndef AliHMPIDDigit_h
2#define AliHMPIDDigit_h
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
ea925242 6// Class of HMPID to manage digits ---> pads
1b10372c 7//.
8//.
9//.
ea925242 10
d3da6dc4 11#include <AliDigit.h> //base class
49dfd67a 12#include <AliRawReader.h>
13#include <AliLog.h>
ea925242 14#include "TMath.h" //Mathieson()
d3da6dc4 15#include <AliBitPacking.h> //Raw()
ae5a42aa 16#include "AliHMPIDParam.h"
d3da6dc4 17
d3da6dc4 18class TClonesArray; //Hit2Sdi()
3c6274c1 19
d3da6dc4 20class AliHMPIDDigit :public AliDigit //TObject-AliDigit-AliHMPIDDigit
21{
22public:
ae5a42aa 23
d3da6dc4 24//ctor&dtor
ae5a42aa 25 AliHMPIDDigit( ):AliDigit( ),fPad(AliHMPIDParam::Abs(-1,-1,-1,-1)),fQ(-1) {} //default ctor
1d4857c5 26 AliHMPIDDigit(Int_t pad,Int_t q,Int_t *t):AliDigit(t),fPad(pad ),fQ(q ) {} //digit ctor
21f61e25 27 AliHMPIDDigit(Int_t pad,Int_t q ):AliDigit( ),fPad(pad ),fQ(q ) {} //digit ctor
1d4857c5 28 AliHMPIDDigit(const AliHMPIDDigit &d ):AliDigit(d),fPad(d.fPad),fQ(d.fQ) {} //copy ctor
29 virtual ~AliHMPIDDigit() {} //dtor
d3da6dc4 30//framework part
31 Bool_t IsSortable ( )const{return kTRUE;} //provision to use TObject::Sort()
32 inline Int_t Compare (const TObject *pObj )const; //provision to use TObject::Sort()
d1bf51e1 33 void Draw (Option_t *opt="" ); //TObject::Draw() overloaded
d3da6dc4 34 void Print (Option_t *opt="" )const; //TObject::Print() overloaded
35//private part
ae5a42aa 36
1d4857c5 37 void AddTidOffset(Int_t offset ) {for (Int_t i=0; i<3; i++) if (fTracks[i]>0) fTracks[i]+=offset; } //needed for merging
ae5a42aa 38 Int_t Ch ( )const{return AliHMPIDParam::A2C(fPad); } //chamber number
39
40 Float_t LorsX ( )const{return AliHMPIDParam::LorsX(AliHMPIDParam::A2P(fPad),AliHMPIDParam::A2X(fPad)); } //center of the pad x, [cm]
41
42 Float_t LorsY ( )const{return AliHMPIDParam::LorsY(AliHMPIDParam::A2P(fPad),AliHMPIDParam::A2Y(fPad)); } //center of the pad y, [cm]
43//
76fd1a96 44 inline Float_t Mathieson (Float_t x )const; //Mathieson distribution
45 inline Float_t IntPartMathi(Float_t z, Int_t axis )const; //integral in 1-dim of Mathieson
46 inline Float_t IntMathieson(Float_t x,Float_t y )const; //integral in 2-dim of Mathieson
ae5a42aa 47 Int_t PadPcX ( )const{return AliHMPIDParam::A2X(fPad);} //pad pc x # 0..79
48 Int_t PadPcY ( )const{return AliHMPIDParam::A2Y(fPad);} //pad pc y # 0..47
49 Int_t PadChX ( )const{return (Pc()%2)*AliHMPIDParam::kPadPcX+PadPcX();} //pad ch x # 0..159
50 Int_t PadChY ( )const{return (Pc()/2)*AliHMPIDParam::kPadPcY+PadPcY();} //pad ch y # 0..143
d3da6dc4 51 Int_t Pad ( )const{return fPad;} //absolute id of this pad
ae5a42aa 52 Int_t Pc ( )const{return AliHMPIDParam::A2P(fPad);} //PC position number
da08475b 53 Float_t Q ( )const{return fQ;} //charge, [QDC]
21f61e25 54 inline void Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const;
f3bae3e2 55 inline Bool_t Set (Int_t c,Int_t p,Int_t x,Int_t y,Int_t tid=0); //manual creation
56 void SetQ (Float_t q ) {fQ=q;} //manual creation
ae5a42aa 57 void SetNsig (Int_t sigmas ) {AliHMPIDParam::fgSigmas=sigmas;} //set n sigmas
ae5a42aa 58
21f61e25 59
c5c19d6a 60protected: //AliDigit has fTracks[3]
ae5a42aa 61
62
1b10372c 63 Int_t fPad; //absolute pad number
c5c19d6a 64 Float_t fQ; //QDC value, fractions are permitted for summable procedure
65 ClassDef(AliHMPIDDigit,4) //HMPID digit class
66};//class AliHMPIDDigit
cf7e313e 67
d3da6dc4 68//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ae5a42aa 69
d3da6dc4 70Int_t AliHMPIDDigit::Compare(const TObject *pObj) const
71{
72// Used in Sort() method to compare to objects. Note that abs pad structure is first x then y, hence will be sorted on column basis.
73// This feature is used in digitizer to facilitate finding of sdigits for the same pad since they all will come together after sorting.
74// Arguments: pObj - pointer to object to compare with
75// Retunrs: -1 if AbsPad less then in pObj, 1 if more and 0 if they are the same
76 if (fPad==((AliHMPIDDigit*)pObj)->Pad()) return 0;
77 else if(fPad >((AliHMPIDDigit*)pObj)->Pad()) return 1;
da08475b 78 else return -1;
d3da6dc4 79}
80//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ae5a42aa 81
76fd1a96 82Float_t AliHMPIDDigit::Mathieson(Float_t x)const
83{
84// Mathieson function.
85// This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
86// Arguments: x- position of the center of Mathieson distribution
87// Returns: value of the Mathieson function
88 Float_t kK1=0.28278795,kK2=0.96242952, kSqrtK3 =0.77459667, kD=0.445;
89 Float_t lambda = x/kD;
90 Float_t a=1-TMath::TanH(kK2*lambda)*TMath::TanH(kK2*lambda);
91 Float_t b=1+kSqrtK3*kSqrtK3*TMath::TanH(kK2*lambda)*TMath::TanH(kK2*lambda);
92 Float_t mathi = kK1*a/b;
93 return mathi;
94}
95//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
96
97Float_t AliHMPIDDigit::IntPartMathi(Float_t z, Int_t axis)const
98{
99// Integration of Mathieson.
100// This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
101// Arguments: x,y- position of the center of Mathieson distribution
102// Returns: a charge fraction [0-1] imposed into the pad
103 Float_t shift1,shift2;
104 if(axis==1) {
105 shift1 = -LorsX()+0.5*AliHMPIDParam::SizePadX();
106 shift2 = -LorsX()-0.5*AliHMPIDParam::SizePadX();
107 } else {
108 shift1 = -LorsY()+0.5*AliHMPIDParam::SizePadY();
109 shift2 = -LorsY()-0.5*AliHMPIDParam::SizePadY();
110 }
111
112 Float_t kK2=0.96242952, kSqrtK3 =0.77459667, kK4=0.37932926, kD=0.445;
113
114 Float_t ux1=kSqrtK3*TMath::TanH(kK2*(z+shift1)/kD);
115 Float_t ux2=kSqrtK3*TMath::TanH(kK2*(z+shift2)/kD);
116
117 return kK4*(TMath::ATan(ux2)-TMath::ATan(ux1));
118}
119//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
120
c5c19d6a 121Float_t AliHMPIDDigit::IntMathieson(Float_t x,Float_t y)const
d3da6dc4 122{
c5c19d6a 123// Integration of Mathieson.
d3da6dc4 124// This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
125// Arguments: x,y- position of the center of Mathieson distribution
126// Returns: a charge fraction [0-1] imposed into the pad
d3da6dc4 127
76fd1a96 128 Float_t xm = IntPartMathi(x,1);
129 Float_t ym = IntPartMathi(y,2);
130 return 4*xm*ym;
d3da6dc4 131}
132//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1d4857c5 133void AliHMPIDDigit::Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const
d3da6dc4 134{
135// Convert digit structure to raw word format
1d4857c5 136// Arguments: w32,ddl,r,d,a where to write the results
137// Returns: none
138 Int_t y2a[6]={5,3,1,0,2,4};
139
21f61e25 140 ddl=2*Ch()+Pc()%2; //DDL# 0..13
1d4857c5 141 Int_t tmp=1+Pc()/2*8+PadPcY()/6; r=(Pc()%2)? 25-tmp:tmp; //row r=1..24
142 d=1+PadPcX()/8; //DILOGIC# 1..10
143 a=y2a[PadPcY()%6]+6*(PadPcX()%8); //ADDRESS 0..47
144
21f61e25 145 w32=0;
146 //Printf("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
147 //
148 //Printf("AliHMPIDDigit::Raw ddl: %d r: %d d: %d a: %d",ddl,r,d,a);
149 //Printf("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
150// Bool_t isOK=kTRUE; isOK=
151 AliBitPacking::PackWord((fQ>4095)?(UInt_t)4095:(UInt_t)fQ,w32, 0,11); // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq Qdc bits (00..11) counts (0..4095)
152 //Printf("isOK: %d",isOK);
153 //molnarl: Since in simulation the the charge can be > than 4095 but not in real life we need to protect. If fQ>4095 after packing we will get 0 for the charge!
154 assert(0<=a&&a<=47);AliBitPacking::PackWord( a ,w32,12,17); // 3322 2222 2222 1111 1111 1000 0000 0000 DILOGIC address bits (12..17) counts (0..47)
155 assert(1<=d&&d<=10);AliBitPacking::PackWord( d ,w32,18,21); // 1098 7654 3210 9876 5432 1098 7654 3210 DILOGIC number bits (18..21) counts (1..10)
156 assert(1<=r&&r<=24);AliBitPacking::PackWord( r ,w32,22,26); // Row number bits (22..26) counts (1..24)
157 AliBitPacking::PackWord((UInt_t)0, w32,27,27); //To make sure set the 27th bit to Zero so we can distinguis it from the EoE
d3da6dc4 158}
159//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
f3bae3e2 160Bool_t AliHMPIDDigit::Set(Int_t ch,Int_t pc,Int_t px,Int_t py,Int_t tid)
1d4857c5 161{
162// Manual creation of digit
163// Arguments: ch,pc,px,py,qdc,tid
f3bae3e2 164// Returns: kTRUE if wrong digit
ae5a42aa 165 if(px<AliHMPIDParam::kMinPx || px>AliHMPIDParam::kMaxPx) return kTRUE;
166 if(py<AliHMPIDParam::kMinPy || py>AliHMPIDParam::kMaxPy) return kTRUE;
1d4857c5 167
ae5a42aa 168 fPad=AliHMPIDParam::Abs(ch,pc,px,py);fTracks[0]=tid;
f3bae3e2 169 fQ=0;
1d4857c5 170 return kFALSE;
171}
21f61e25 172//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
173
d3da6dc4 174#endif