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[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 class AliHMPIDHit;          //Hit2Sdi()
12 class TClonesArray;        //Hit2Sdi()
13  
14 class AliHMPIDDigit :public AliDigit //TObject-AliDigit-AliHMPIDDigit
15 {
16 public:
17   enum EAbsPad {kChAbs=100000000,kPcAbs=1000000,kPadAbsX=1000,kPadAbsY=1};       //absolute pad number structure
18   enum ERawData{kNddls=14};                                                      //RAW data structure
19   enum EPadData{kPcX=2,kPcY=3,kPadPcX=80,kPadPcY=48,kPadAllX=kPadPcX*kPcX,kPadAllY=kPadPcY*kPcY,kPcAll=kPcX*kPcY,kPadAll=kPadAllX*kPadAllY};   //Segmentation structure 
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   inline   AliHMPIDDigit(Int_t c,Float_t q,Int_t t,Float_t x,Float_t y,Int_t f=0);                                                               //sdigit 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    Print       (Option_t *opt=""               )const;                                                                   //TObject::Print() overloaded
29 //private part  
30   static Int_t   Abs         (Int_t c,Int_t s,Int_t x,Int_t y)     {return c*kChAbs+s*kPcAbs+x*kPadAbsX+y*kPadAbsY; }                  //(ch,pc,padx,pady)-> abs pad
31   static Int_t   A2C         (Int_t pad                      )     {return pad/kChAbs;                              }                  //abs pad -> chamber
32   static Int_t   A2P         (Int_t pad                      )     {return pad%kChAbs/kPcAbs;                       }                  //abs pad -> pc
33   static Int_t   A2X         (Int_t pad                      )     {return pad%kPcAbs/kPadAbsX;                     }                  //abs pad -> pad X 
34   static Int_t   A2Y         (Int_t pad                      )     {return pad%kPadAbsX;                            }                  //abs pad -> pad Y 
35          Int_t   Addr        (                               )const{Int_t map[6]={5,3,1,0,2,4};return map[A2Y(fPad)%6]+6*(A2X(fPad)%8);}//ADDRESS 0..47
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          Int_t   Dilogic     (                               )const{return 1+PadPcX()/8;                            }                  //DILOGIC# 1..10
39   static void    DrawPc      (Bool_t isFill=kTRUE            );                                                                        //draw PCs
40   static void    DrawSeg     (                               );                                                                        //draw segmentation
41          void    DrawZoom    (                               ); 
42          Int_t   DdlIdx      (                               )const{return 2*Ch()+Pc()%2;                           }                  //DDL# 0..13
43          Int_t   DdlId       (                               )const{return (6<<8)+DdlIdx();                         }                  //DDL ID 0x600..0x60d
44   static Float_t Hit2Sdi     (AliHMPIDHit *pHit,TClonesArray*);                                                                        //hit -> 9 sdigits, returns total QDC   
45   static Bool_t  IsOverTh    (Float_t q                      )     {return q > 6;                                   }                  //is digit over threshold????
46   static Bool_t  IsInside    (Float_t x,Float_t y            )     {return x>0&&y>0&&x<SizeAllX()&&y<SizeAllY();    }                  //is point inside pc boundary?
47   inline static Bool_t IsInDead  (Float_t x,Float_t y        );                                                                        //is point in dead area?
48          Float_t LorsX       (                               )const{return (PadPcX()+0.5)*SizePadX()+(Pc()%2)*(SizePcX()+SizeDead());} //center of the pad x, [cm]
49          Float_t LorsY       (                               )const{return (PadPcY()+0.5)*SizePadY()+(Pc()/2)*(SizePcY()+SizeDead());} //center of the pad y, [cm]
50   inline Float_t Mathieson   (Float_t x,Float_t y            )const;                                                                   //Mathieson distribution 
51          Int_t   PadPcX      (                               )const{return A2X(fPad);}                                                 //pad x within PC 0..79
52          Int_t   PadPcY      (                               )const{return A2Y(fPad);}                                                 //pad y within PC 0..47
53          Int_t   PadChX      (                               )const{return A2X(fPad);}                                                 //pad x within chamber
54          Int_t   PadChY      (                               )const{return A2Y(fPad);}                                                 //pad y within chamber
55          Int_t   Pad         (                               )const{return fPad;}                                                      //absolute id of this pad
56          Int_t   Pc          (                               )const{return A2P(fPad);}                                                 //PC position number
57   static void    PrintSize   (                               );                                                                        //print all segmentation sizes      
58          Float_t Q           (                               )const{return fQ;}                                                        //charge, [QDC]
59   inline Int_t   Raw         (        UInt_t &raw32          )const;                                                                   //digit->(ddl,raw32)
60   inline void    Raw         (Int_t l,UInt_t raw32           );                                                                        //(ddl,raw32)->digit
61   static Int_t   Raw2Ch      (UInt_t l                       )     {return l/2;}                                                       //ch=f(ddl)   
62   static Int_t   Raw2Pc      (UInt_t l,UInt_t r              )     {r=(r-1)/8;return (l%2)?5-2*r:2*r;}                                 //pc=f(ddl,r)   
63   static Int_t   Raw2X       (         UInt_t d,UInt_t a     )     {                                              return (d-1)*8+a/6;} //padx=f(d,a)
64   static Int_t   Raw2Y       (UInt_t l,UInt_t r,UInt_t a     )     {Int_t a2y[6]={3,2,4,1,5,0};r=(l%2)?(24-r):r-1;return 6*(r%8)+a2y[a%6];}//pady=f(ddl,r,a)
65          Int_t   Row         (                               )const{Int_t r=1+Pc()/2*8+PadPcY()/6; return (Pc()%2)? 25-r:r;}           //row r=1..24
66          void    Set         (Int_t c,Int_t s,Int_t x,Int_t y)     {fPad=Abs(c,s,x,y);fQ=0xa3;}                                        //set new digit
67   
68   static Float_t SizeAllX    (                               )     {return SizePadX()*kPadAllX+SizeDead();}                            //all PCs size x, [cm]        
69   static Float_t SizeAllY    (                               )     {return SizePadY()*kPadAllY+2*SizeDead();}                          //all PCs size y, [cm]    
70   static Float_t SizeArea    (                               )     {return SizePcX()*SizePcY()*kPcAll;}                                //sence area, [cm^2]  
71   static Float_t SizeDead    (                               )     {return 2.6;}                                                       //dead zone size x, [cm]         
72   static Float_t SizeGap     (                               )     {return 8;  }
73   static Float_t SizePadX    (                               )     {return 0.8;}                                                       //pad size x, [cm]  
74   static Float_t SizePadY    (                               )     {return 0.84;}                                                      //pad size y, [cm]  
75   static Float_t SizePcX     (                               )     {return SizePadX()*kPadPcX;}                                        //PC size x, [cm]        
76   static Float_t SizePcY     (                               )     {return SizePadY()*kPadPcY;}                                        //PC size y, [cm]    
77   static Float_t SizeWin     (                               )     {return 0.5;}                                                       //Quartz window width
78   static Float_t SizeRad     (                               )     {return 1.5;}                                                       //Rad width   
79   static void    Test        (                               );                                                                        //Test conversions
80 protected:                  //AliDigit has fTracks[3]
81   Int_t   fPad;             //absolute pad number is chamber*kCham
82   Float_t  fQ;              //QDC value, fractions are permitted for summable procedure  
83   ClassDef(AliHMPIDDigit,4) //HMPID digit class       
84 };//class AliHMPIDDigitN
85
86 typedef AliHMPIDDigit AliRICHDigit; // for backward compatibility
87
88 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
89 AliHMPIDDigit::AliHMPIDDigit(Int_t c,Float_t q,Int_t t,Float_t x,Float_t y,Int_t flag):AliDigit(),fPad(Abs(-1,-1,-1,-1)),fQ(-1)  
90 {
91 // Creation of sdigit  
92 // Arguments: c- chamber 
93 //            q- total QDC
94 //            t -TID
95 //            x,y - hit position, LORS      
96 //            flag- which pad to try     
97 //   Returns: none    
98   Int_t pc,padx,pady;
99   if     (x>=          0          && x<=  SizePcX()            ) {pc=0; padx=Int_t( x                           / SizePadX());}//PC 0 or 2 or 4
100   else if(x>=SizePcX()+SizeDead() && x<=  SizeAllX()           ) {pc=1; padx=Int_t((x-  SizePcX()-  SizeDead()) / SizePadX());}//PC 2 or 4 or 6
101   else return;
102   if     (y>=          0          && y<=  SizePcY()            ) {      pady=Int_t( y                           / SizePadY());}//PC 0 or 1
103   else if(y>=SizePcY()+SizeDead() && y<=2*SizePcY()+SizeDead() ) {pc+=2;pady=Int_t((y-  SizePcY()-  SizeDead()) / SizePadY());}//PC 2 or 3
104   else if(y>=SizeAllY()-SizePcY() && y<=  SizeAllY()           ) {pc+=4;pady=Int_t((y-2*SizePcY()-2*SizeDead()) / SizePadY());}//PC 4 or 5
105   else return;
106   
107   switch(flag){
108     case 8:padx--;pady++;break;    case 1:pady++;break;    case 2:padx++; pady++;break;
109                                               
110     case 7: padx--;      break;    case 0:       break;    case 3:padx++;        break;
111                                                  
112     case 6:padx--;pady--;break;    case 5:pady--;break;    case 4:padx++; pady--;break;                                            
113   }
114   if(padx<0 || padx>=kPadPcX) return;
115   if(pady<0 || pady>=kPadPcY) return;
116   fPad=Abs(c,pc,padx,pady);
117   fQ=q*Mathieson(x,y);
118   fTracks[0]=t; 
119 }    
120 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
121 Int_t AliHMPIDDigit::Compare(const TObject *pObj) const
122 {
123 // 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.
124 // This feature is used in digitizer to facilitate finding of sdigits for the same pad since they all will come together after sorting.
125 // Arguments: pObj - pointer to object to compare with
126 //   Retunrs: -1 if AbsPad less then in pObj, 1 if more and 0 if they are the same      
127   if     (fPad==((AliHMPIDDigit*)pObj)->Pad()) return  0;
128   else if(fPad >((AliHMPIDDigit*)pObj)->Pad()) return  1;
129   else                                         return -1;
130 }
131 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
132 Bool_t AliHMPIDDigit::IsInDead(Float_t x,Float_t y)
133 {
134 // Check is the current point is outside of sensitive area or in dead zones
135 // Arguments: x,y -position
136 //   Returns: 1 if not in sensitive zone           
137   if(x<0 || x>SizeAllX() || y<0 || y>SizeAllY()) return kTRUE; //out of pc 
138   
139   if(x>SizePcX()  && x<SizePcX()+SizeDead())   return kTRUE; //in dead zone along x  
140   
141   if(y>SizePcY()                       && y<SizePcY()+SizeDead())      return kTRUE; //in first dead zone along y   
142   if(y>SizeAllY()-SizePcY()-SizeDead() && y<SizeAllY()-SizePcY())      return kTRUE; //in second dead zone along y   
143   return kFALSE;
144 }
145 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
146 Float_t AliHMPIDDigit::Mathieson(Float_t x,Float_t y)const
147 {
148 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
149 // Arguments: x,y- position of the center of Mathieson distribution
150 //  Returns: a charge fraction [0-1] imposed into the pad
151   const Float_t kSqrtK3=0.77459667,k2=0.962,k4=0.379;
152
153   Float_t ux1=kSqrtK3*TMath::TanH(k2*(x-LorsX()+0.5*SizePadX())/0.425);
154   Float_t ux2=kSqrtK3*TMath::TanH(k2*(x-LorsX()-0.5*SizePadX())/0.425);
155   Float_t uy1=kSqrtK3*TMath::TanH(k2*(y-LorsY()+0.5*SizePadY())/0.425);
156   Float_t uy2=kSqrtK3*TMath::TanH(k2*(y-LorsY()-0.5*SizePadY())/0.425);
157   return 4*k4*(TMath::ATan(ux2)-TMath::ATan(ux1))*k4*(TMath::ATan(uy2)-TMath::ATan(uy1));
158 }
159 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
160 Int_t AliHMPIDDigit::Raw(UInt_t &w32)const
161 {
162 // Convert digit structure to raw word format
163 // Arguments: 32 bits raw word to fill
164 //   Returns: DDL ID where to write this digit
165   w32=0;
166   AliBitPacking::PackWord((UInt_t)fQ        ,w32, 0,11);  // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq        Qdc               bits (00..11) counts (0..4095)
167   AliBitPacking::PackWord(         Addr()   ,w32,12,17);  // 3322 2222 2222 1111 1111 1000 0000 0000        DILOGIC address   bits (12..17) counts (0..47)
168   AliBitPacking::PackWord(         Dilogic(),w32,18,21);  // 1098 7654 3210 9876 5432 1098 7654 3210        DILOGIC number    bits (18..21) counts (1..10)
169   AliBitPacking::PackWord(         Row()    ,w32,22,26);  //                                                Row number        bits (22..26) counts (1..24)  
170   return DdlIdx(); //ddl 0..13 where to write this digit 
171 }
172 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
173 void AliHMPIDDigit::Raw(Int_t ddl,UInt_t w32)
174 {
175 // Converts a given raw data word to a digit
176 // Arguments: w32 - 32 bits raw data word
177 //            ddl - DDL idx  0 1 2 3 4 ... 13
178 //   Returns: none
179         fQ = AliBitPacking::UnpackWord(w32, 0,11);  // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq         Qdc               bits (00..11) counts (0..4095)   
180   UInt_t a = AliBitPacking::UnpackWord(w32,12,17);  // 3322 2222 2222 1111 1111 1000 0000 0000         DILOGIC address   bits (12..17) counts (0..47)
181   UInt_t d = AliBitPacking::UnpackWord(w32,18,21);  // 1098 7654 3210 9876 5432 1098 7654 3210         DILOGIC number    bits (18..21) counts (1..10)
182   UInt_t r = AliBitPacking::UnpackWord(w32,22,26);  //                                                 Row number        bits (22..26) counts (1..24)    
183   fPad=Abs(Raw2Ch(ddl),Raw2Pc(ddl,r),Raw2X(d,a),Raw2Y(ddl,r,a));
184 }
185 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
186 #endif