area of Mathieson parametrized; hit ctor change eloss to qdc; Helix removed
[u/mrichter/AliRoot.git] / HMPID / AliHMPIDDigit.h
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
6 #include <AliDigit.h>      //base class  
7 #include <TMath.h>         //Mathieson()
8 #include <TRandom.h>       //IsOverTh()  
9 #include <AliBitPacking.h> //Raw()
10
11
12 class TClonesArray;        //Hit2Sdi()
13   
14 class AliHMPIDDigit :public AliDigit //TObject-AliDigit-AliHMPIDDigit
15 {
16 public:
17   enum EChamberData{kMinCh=0,kMaxCh=6,kMinPc=0,kMaxPc=5};  
18   enum EPadxData{kPadPcX=80,kMinPx=0,kMaxPx=kPadPcX-1,kMaxPadChX=159};   //Segmentation structure along x
19   enum EPadyData{kPadPcY=48,kMinPy=0,kMaxPy=kPadPcY-1,kMaxPadChY=143};   //Segmentation structure along y
20 //ctor&dtor    
21   AliHMPIDDigit(                          ):AliDigit( ),fPad(Abs(-1,-1,-1,-1)),fQ(-1)  {}                         //default ctor
22   AliHMPIDDigit(Int_t pad,Int_t q,Int_t *t):AliDigit(t),fPad(pad             ),fQ(q )  {}                         //digit ctor
23   AliHMPIDDigit(const AliHMPIDDigit &d    ):AliDigit(d),fPad(d.fPad),fQ(d.fQ)          {}                         //copy ctor
24   virtual ~AliHMPIDDigit()                                                             {}                         //dtor   
25 //framework part    
26          Bool_t  IsSortable  (                               )const{return kTRUE;}                                                     //provision to use TObject::Sort() 
27   inline Int_t   Compare     (const TObject *pObj            )const;                                                                   //provision to use TObject::Sort()
28          void    Draw        (Option_t *opt=""               );                                                                        //TObject::Draw() overloaded
29          void    Print       (Option_t *opt=""               )const;                                                                   //TObject::Print() overloaded
30 //private part  
31   static Int_t   Abs         (Int_t c,Int_t s,Int_t x,Int_t y)     {return c*100000000+s*1000000+x*1000+y;                           } //(ch,pc,padx,pady)-> abs pad
32   static Int_t   A2C         (Int_t pad                      )     {return pad/100000000;                                            } //abs pad -> chamber
33   static Int_t   A2P         (Int_t pad                      )     {return pad%100000000/1000000;                                    } //abs pad -> pc
34   static Int_t   A2X         (Int_t pad                      )     {return pad%1000000/1000;                                         } //abs pad -> pad X 
35   static Int_t   A2Y         (Int_t pad                      )     {return pad%1000;                                                 } //abs pad -> pad Y 
36          void    AddTidOffset(Int_t offset                   )     {for (Int_t i=0; i<3; i++) if (fTracks[i]>0) fTracks[i]+=offset;  } //needed for merging
37          Int_t   Ch          (                               )const{return A2C(fPad);                                                } //chamber number
38   static Bool_t  IsOverTh    (Float_t q                      )     {return q >= 4;                                                   } //is digit over threshold????
39   static Bool_t  IsInside    (Float_t x,Float_t y            )     {return x>0&&y>0&&x<SizeAllX()&&y<SizeAllY();                     } //is point inside chamber boundary?
40          Float_t LorsX       (                               )const{return LorsX(A2P(fPad),A2X(fPad));                               } //center of the pad x, [cm]
41   static Float_t LorsX       (Int_t pc,Int_t padx            )     {return (padx    +0.5)*SizePadX()+(pc  %2)*(SizePcX()+SizeDead());} //center of the pad x, [cm]
42          Float_t LorsY       (                               )const{return LorsY(A2P(fPad),A2Y(fPad));                               } //center of the pad y, [cm]
43   static Float_t LorsY       (Int_t pc,Int_t pady            )     {return (pady    +0.5)*SizePadY()+(pc  /2)*(SizePcY()+SizeDead());} //center of the pad y, [cm]
44   inline Float_t Mathieson   (Float_t x,Float_t y            )const;                                                                   //Mathieson distribution 
45          Int_t   PadPcX      (                               )const{return A2X(fPad);}                                                 //pad pc x # 0..79
46          Int_t   PadPcY      (                               )const{return A2Y(fPad);}                                                 //pad pc y # 0..47
47          Int_t   PadChX      (                               )const{return (Pc()%2)*kPadPcX+PadPcX();}                                 //pad ch x # 0..159
48          Int_t   PadChY      (                               )const{return (Pc()/2)*kPadPcY+PadPcY();}                                 //pad ch y # 0..143
49          Int_t   Pad         (                               )const{return fPad;}                                                      //absolute id of this pad
50          Int_t   Pc          (                               )const{return A2P(fPad);}                                                 //PC position number
51          Float_t Q           (                               )const{return fQ;}                                                        //charge, [QDC]
52   inline void    Raw         (UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const;                                                 //digit->(w32,ddl,r,d,a)
53   inline void    Raw         (UInt_t  w32,Int_t  ddl         );                                                                        //(w32,ddl)->digit
54   inline Bool_t  Set         (Int_t c,Int_t p,Int_t x,Int_t y,Float_t q=0,Int_t tid=0);                                                //manual creation 
55   static void    WriteRaw    (TObjArray *pDigLst             );                                                                        //write as raw stream     
56   
57   static Float_t SizeAllX    (                               )     {return fMaxPcX[5];}                                                //all PCs size x, [cm]        
58   static Float_t SizeAllY    (                               )     {return fMaxPcY[5];}                                                //all PCs size y, [cm]    
59   static Float_t SizeArea    (                               )     {return SizePcX()*SizePcY()*(kMaxPc-kMinPc+1);}                     //sence area, [cm^2]  
60   static Float_t SizeDead    (                               )     {return 2.6;}                                                       //dead zone size x, [cm]         
61   static Float_t SizeGap     (                               )     {return 8;  }
62   static Float_t SizePadX    (                               )     {return 0.8;}                                                       //pad size x, [cm]  
63   static Float_t SizePadY    (                               )     {return 0.84;}                                                      //pad size y, [cm]  
64   static Float_t SizePcX     (                               )     {return fMaxPcX[0];}                                                //PC size x, [cm]        
65   static Float_t SizePcY     (                               )     {return fMaxPcY[0];}                                                //PC size y, [cm]    
66   static Float_t SizeWin     (                               )     {return 0.5;}                                                       //Quartz window width
67   static Float_t SizeRad     (                               )     {return 1.5;}                                                       //Rad width   
68   static const Float_t fMinPcX[6];
69   static const Float_t fMinPcY[6];
70   static const Float_t fMaxPcX[6];
71   static const Float_t fMaxPcY[6];
72   
73   inline static Bool_t IsInDead(Float_t x,Float_t y        );                                                                        //is point in dead area?
74   inline static void   Lors2Pad(Float_t x,Float_t y,Int_t &pc,Int_t &px,Int_t &py);                                                  //(x,y)->(pc,px,py) 
75   
76 protected:                  //AliDigit has fTracks[3]
77   Int_t    fPad;            //absolute pad number
78   Float_t  fQ;              //QDC value, fractions are permitted for summable procedure  
79   ClassDef(AliHMPIDDigit,4) //HMPID digit class       
80 };//class AliHMPIDDigitN
81
82 typedef AliHMPIDDigit AliRICHDigit; // for backward compatibility
83
84 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
85 void AliHMPIDDigit::Lors2Pad(Float_t x,Float_t y,Int_t &pc,Int_t &px,Int_t &py)
86 {
87 // Check the pad of given position
88 // Arguments: x,y- position [cm] in LORS; pc,px,py- pad where to store the result
89 //   Returns: none
90   pc=px=py=-1;
91   if     (x>=          0          && x<=  SizePcX()            ) {pc=0; px=Int_t( x                           / SizePadX());}//PC 0 or 2 or 4
92   else if(x>=SizePcX()+SizeDead() && x<=  SizeAllX()           ) {pc=1; px=Int_t((x-  SizePcX()-  SizeDead()) / SizePadX());}//PC 2 or 4 or 6
93   else return;
94   if     (y>=          0          && y<=  SizePcY()            ) {      py=Int_t( y                           / SizePadY());}//PC 0 or 1
95   else if(y>=SizePcY()+SizeDead() && y<=2*SizePcY()+SizeDead() ) {pc+=2;py=Int_t((y-  SizePcY()-  SizeDead()) / SizePadY());}//PC 2 or 3
96   else if(y>=SizeAllY()-SizePcY() && y<=  SizeAllY()           ) {pc+=4;py=Int_t((y-2*SizePcY()-2*SizeDead()) / SizePadY());}//PC 4 or 5
97   else return;
98 }
99 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
100 Int_t AliHMPIDDigit::Compare(const TObject *pObj) const
101 {
102 // 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.
103 // This feature is used in digitizer to facilitate finding of sdigits for the same pad since they all will come together after sorting.
104 // Arguments: pObj - pointer to object to compare with
105 //   Retunrs: -1 if AbsPad less then in pObj, 1 if more and 0 if they are the same      
106   if     (fPad==((AliHMPIDDigit*)pObj)->Pad()) return  0;
107   else if(fPad >((AliHMPIDDigit*)pObj)->Pad()) return  1;
108   else                                         return -1;
109 }
110 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
111 Bool_t AliHMPIDDigit::IsInDead(Float_t x,Float_t y)
112 {
113 // Check is the current point is outside of sensitive area or in dead zones
114 // Arguments: x,y -position
115 //   Returns: 1 if not in sensitive zone           
116   if(x<0 || x>SizeAllX() || y<0 || y>SizeAllY()) return kTRUE; //out of pc 
117   
118   if(x>SizePcX()  && x<SizePcX()+SizeDead())   return kTRUE; //in dead zone along x  
119   
120   if(y>SizePcY()                       && y<SizePcY()+SizeDead())      return kTRUE; //in first dead zone along y   
121   if(y>SizeAllY()-SizePcY()-SizeDead() && y<SizeAllY()-SizePcY())      return kTRUE; //in second dead zone along y   
122   return kFALSE;
123 }
124 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
125 Float_t AliHMPIDDigit::Mathieson(Float_t x,Float_t y)const
126 {
127 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
128 // Arguments: x,y- position of the center of Mathieson distribution
129 //  Returns: a charge fraction [0-1] imposed into the pad
130   const Float_t kSqrtK3=0.77459667,k2=0.962,k4=0.379;
131
132   Float_t ux1=kSqrtK3*TMath::TanH(k2*(x-LorsX()+0.5*SizePadX())/0.425);
133   Float_t ux2=kSqrtK3*TMath::TanH(k2*(x-LorsX()-0.5*SizePadX())/0.425);
134   Float_t uy1=kSqrtK3*TMath::TanH(k2*(y-LorsY()+0.5*SizePadY())/0.425);
135   Float_t uy2=kSqrtK3*TMath::TanH(k2*(y-LorsY()-0.5*SizePadY())/0.425);
136   return 4*k4*(TMath::ATan(ux2)-TMath::ATan(ux1))*k4*(TMath::ATan(uy2)-TMath::ATan(uy1));
137 }
138 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
139 void AliHMPIDDigit::Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const
140 {
141 // Convert digit structure to raw word format
142 // Arguments: w32,ddl,r,d,a where to write the results
143 //   Returns: none
144   Int_t y2a[6]={5,3,1,0,2,4};
145
146                                   ddl=2*Ch()+Pc()%2;                     //DDL# 0..13
147   Int_t tmp=1+Pc()/2*8+PadPcY()/6;  r=(Pc()%2)? 25-tmp:tmp;              //row r=1..24
148                                     d=1+PadPcX()/8;                      //DILOGIC# 1..10
149                                     a=y2a[PadPcY()%6]+6*(PadPcX()%8);    //ADDRESS 0..47        
150       
151   w32=0;    
152   AliBitPacking::PackWord((UInt_t)fQ,w32, 0,11);  // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq        Qdc               bits (00..11) counts (0..4095)
153   AliBitPacking::PackWord(        a ,w32,12,17);  // 3322 2222 2222 1111 1111 1000 0000 0000        DILOGIC address   bits (12..17) counts (0..47)
154   AliBitPacking::PackWord(        d ,w32,18,21);  // 1098 7654 3210 9876 5432 1098 7654 3210        DILOGIC number    bits (18..21) counts (1..10)
155   AliBitPacking::PackWord(        r ,w32,22,26);  //                                                Row number        bits (22..26) counts (1..24)  
156 }
157 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
158 void AliHMPIDDigit::Raw(UInt_t w32,Int_t ddl)
159 {
160 // Converts a given raw data word to a digit
161 // Arguments: w32 - 32 bits raw data word
162 //            ddl - DDL idx  0 1 2 3 4 ... 13
163 //   Returns: none
164   Int_t a2y[6]={3,2,4,1,5,0};//pady for a given address (for single DILOGIC chip)
165   Int_t r = AliBitPacking::UnpackWord(w32,22,26); assert(1<=r&&r<=24);   //                                         Row number      (1..24)    
166   Int_t d = AliBitPacking::UnpackWord(w32,18,21); assert(1<=d&&d<=10);   // 3322 2222 2222 1111 1111 1000 0000 0000 DILOGIC number  (1..10)
167   Int_t a = AliBitPacking::UnpackWord(w32,12,17); assert(0<=a&&a<=47);   // 1098 7654 3210 9876 5432 1098 7654 3210 DILOGIC address (0..47)  
168   Int_t q = AliBitPacking::UnpackWord(w32, 0,11); assert(0<=q&&q<=4095); // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq Qdc             (0..4095)   
169                                   Int_t ch=ddl/2;
170   Int_t tmp=(r-1)/8;              Int_t pc=(ddl%2)? 5-2*tmp:2*tmp; 
171                                   Int_t px=(d-1)*8+a/6;
172         tmp=(ddl%2)?(24-r):r-1;   Int_t py=6*(tmp%8)+a2y[a%6];
173   fPad=Abs(ch,pc,px,py);fQ=q;
174 }
175 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
176 Bool_t AliHMPIDDigit::Set(Int_t ch,Int_t pc,Int_t px,Int_t py,Float_t qdc,Int_t tid)
177 {
178 // Manual creation of digit
179 // Arguments: ch,pc,px,py,qdc,tid  
180 //   Returns: none  
181   if(px<kMinPx || px>kMaxPx) return kTRUE;
182   if(py<kMinPy || py>kMaxPy) return kTRUE;
183
184   fPad=Abs(ch,pc,px,py);fQ=qdc;fTracks[0]=tid;
185   return kFALSE;
186 }
187 #endif