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 #include "AliHMPIDHit.h"   //Hit2Sdi(), ctor()
  11
  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 )  {}                                      //ctor used in digitizer
  23   virtual ~AliHMPIDDigit(                                      )                                            {}                                      //dtor
  24 //framework part
  25          Bool_t  IsSortable  (                               )const{return kTRUE;}                                                     //provision to use TObject::Sort()
  26   inline Int_t   Compare     (const TObject *pObj            )const;                                                                   //provision to use TObject::Sort()
  27          void    Print       (Option_t *opt=""               )const;                                                                   //TObject::Print() overloaded
  28 //private part
  29   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
  30   static Int_t   A2C         (Int_t pad                      )     {return pad/kChAbs;                              }                  //abs pad -> chamber
  31   static Int_t   A2P         (Int_t pad                      )     {return pad%kChAbs/kPcAbs;                       }                  //abs pad -> pc
  32   static Int_t   A2X         (Int_t pad                      )     {return pad%kPcAbs/kPadAbsX;                     }                  //abs pad -> pad X
  33   static Int_t   A2Y         (Int_t pad                      )     {return pad%kPadAbsX;                            }                  //abs pad -> pad Y
  34          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
  35          void    AddTidOffset(Int_t offset                   )     {for (Int_t i=0; i<3; i++) if (fTracks[i]>0) fTracks[i]+=offset;};  //needed for merging
  36          Int_t   Ch          (                               )const{return A2C(fPad);                               }                  //chamber number
  37          Int_t   Dilogic     (                               )const{return 1+PadPcX()/8;                            }                  //DILOGIC# 1..10
  38   static void    DrawPc      (Bool_t isFill=kTRUE            );                                                                        //draw PCs
  39   static void    DrawSeg     (                               );                                                                        //draw segmentation
  40          void    DrawZoom    (                               );
  41          Int_t   DdlIdx      (                               )const{return 2*Ch()+Pc()%2;                           }                  //DDL# 0..13
  42          Int_t   DdlId       (                               )const{return (6<<8)+DdlIdx();                         }                  //DDL ID 0x600..0x60d
  43   static void    Hit2Sdi     (AliHMPIDHit *pHit,TClonesArray*);                                                                        //hit -> 9 sdigits
  44   static Bool_t  IsOverTh    (Float_t q                      )     {return q > 6;                                   }                  //is digit over threshold????
  45   static Bool_t  IsInside    (Float_t x,Float_t y            )     {return x>0&&y>0&&x<SizeAllX()&&y<SizeAllY();    }                  //is point inside pc boundary?
  46   inline static Bool_t IsInDead  (Float_t x,Float_t y        );                                                                        //is point in dead area?
  47          Float_t LorsX       (                               )const{return (PadPcX()+0.5)*SizePadX()+(Pc()%2)*(SizePcX()+SizeDead());} //center of the pad x, [cm]
  48          Float_t LorsY       (                               )const{return (PadPcY()+0.5)*SizePadY()+(Pc()/2)*(SizePcY()+SizeDead());} //center of the pad y, [cm]
  49          void    Manual1     (Int_t c,Float_t x,Float_t y,Int_t q=33){AliHMPIDHit h(c,q,x,y); Set(&h,0);}                              //manual creation
  50          void    Manual2     (Int_t c,Int_t p,Int_t x,Int_t y)     {fPad=Abs(c,p,x,y);}                                                //manual creation
  51   inline Float_t Mathieson   (Float_t x,Float_t y            )const;                                                                   //Mathieson distribution
  52          Int_t   PadPcX      (                               )const{return A2X(fPad);}                                                 //pad pc x # 0..79
  53          Int_t   PadPcY      (                               )const{return A2Y(fPad);}                                                 //pad pc y # 0..47
  54          Int_t   PadChX      (                               )const{return (Pc()%2)*kPadPcX+PadPcX();}                                 //pad ch x # 0..159
  55          Int_t   PadChY      (                               )const{return (Pc()/2)*kPadPcY+PadPcY();}                                 //pad ch y # 0..143
  56          Int_t   Pad         (                               )const{return fPad;}                                                      //absolute id of this pad
  57          Int_t   Pc          (                               )const{return A2P(fPad);}                                                 //PC position number
  58   static void    PrintSize   (                               );                                                                        //print all segmentation sizes
  59          Float_t Q           (                               )const{return fQ;}                                                        //charge, [QDC]
  60   inline Int_t   Raw         (        UInt_t &raw32          )const;                                                                   //digit->(ddl,raw32)
  61   inline void    Raw         (Int_t l,UInt_t raw32           );                                                                        //(ddl,raw32)->digit
  62   static Int_t   Raw2Ch      (UInt_t l                       )     {return l/2;}                                                       //ch=f(ddl)
  63   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)
  64   static Int_t   Raw2X       (         UInt_t d,UInt_t a     )     {                                              return (d-1)*8+a/6;} //padx=f(d,a)
  65   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)
  66          Int_t   Row         (                               )const{Int_t r=1+Pc()/2*8+PadPcY()/6; return (Pc()%2)? 25-r:r;}           //row r=1..24
  67   inline Bool_t  Set         (AliHMPIDHit *pHit,Int_t pad    );                                                                        //sdigit from hit in given pad
  68
  69   static Float_t SizeAllX    (                               )     {return SizePadX()*kPadAllX+SizeDead();}                            //all PCs size x, [cm]
  70   static Float_t SizeAllY    (                               )     {return SizePadY()*kPadAllY+2*SizeDead();}                          //all PCs size y, [cm]
  71   static Float_t SizeArea    (                               )     {return SizePcX()*SizePcY()*kPcAll;}                                //sence area, [cm^2]
  72   static Float_t SizeDead    (                               )     {return 2.6;}                                                       //dead zone size x, [cm]
  73   static Float_t SizeGap     (                               )     {return 8;  }
  74   static Float_t SizePadX    (                               )     {return 0.8;}                                                       //pad size x, [cm]
  75   static Float_t SizePadY    (                               )     {return 0.84;}                                                      //pad size y, [cm]
  76   static Float_t SizePcX     (                               )     {return SizePadX()*kPadPcX;}                                        //PC size x, [cm]
  77   static Float_t SizePcY     (                               )     {return SizePadY()*kPadPcY;}                                        //PC size y, [cm]
  78   static Float_t SizeWin     (                               )     {return 0.5;}                                                       //Quartz window width
  79   static Float_t SizeRad     (                               )     {return 1.5;}                                                       //Rad width
  80   static void    Test        (                               );                                                                        //Test conversions
  81 protected:                  //AliDigit has fTracks[3]
  82   Int_t    fPad;            //absolute pad number
  83   Float_t  fQ;              //QDC value, fractions are permitted for summable procedure
  84   ClassDef(AliHMPIDDigit,4) //HMPID digit class
  85 };//class AliHMPIDDigitN
  86
  87 typedef AliHMPIDDigit AliRICHDigit; // for backward compatibility
  88
  89 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  90 Bool_t AliHMPIDDigit::Set(AliHMPIDHit *pHit,Int_t pad)
  91 {
  92 // Creates digit
  93 // Arguments: pHit- pointer to the hit
  94 //            pad - for which pad to create
  95 //   Returns: none
  96
  97   fPad=Abs(-1,-1,-1,-1); fQ=-1; //reset
  98   Int_t pc,px,py;
  99   Float_t x=pHit->LorsX(),y=pHit->LorsY();
 100
 101   if     (x>=          0          && x<=  SizePcX()            ) {pc=0; px=Int_t( x                           / SizePadX());}//PC 0 or 2 or 4
 102   else if(x>=SizePcX()+SizeDead() && x<=  SizeAllX()           ) {pc=1; px=Int_t((x-  SizePcX()-  SizeDead()) / SizePadX());}//PC 2 or 4 or 6
 103   else return kFALSE;
 104   if     (y>=          0          && y<=  SizePcY()            ) {      py=Int_t( y                           / SizePadY());}//PC 0 or 1
 105   else if(y>=SizePcY()+SizeDead() && y<=2*SizePcY()+SizeDead() ) {pc+=2;py=Int_t((y-  SizePcY()-  SizeDead()) / SizePadY());}//PC 2 or 3
 106   else if(y>=SizeAllY()-SizePcY() && y<=  SizeAllY()           ) {pc+=4;py=Int_t((y-2*SizePcY()-2*SizeDead()) / SizePadY());}//PC 4 or 5
 107   else return kFALSE;
 108
 109   switch(pad){
 110     case 8: px--;py++;break;    case 1:py++;break;    case 2:px++; py++;break;
 111
 112     case 7: px--;     break;    case 0:     break;    case 3:px++;      break;
 113
 114     case 6: px--;py--;break;    case 5:py--;break;    case 4:px++; py--;break;
 115   }
 116   if(px<0 || px>=kPadPcX) return kFALSE;
 117   if(py<0 || py>=kPadPcY) return kFALSE;
 118   fPad=Abs(pHit->Ch(),pc,px,py);
 119   fQ=pHit->Q()*Mathieson(x,y);
 120   fTracks[0]=pHit->Tid();
 121   return kTRUE;
 122 }//Set()
 123 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 124 Int_t AliHMPIDDigit::Compare(const TObject *pObj) const
 125 {
 126 // 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.
 127 // This feature is used in digitizer to facilitate finding of sdigits for the same pad since they all will come together after sorting.
 128 // Arguments: pObj - pointer to object to compare with
 129 //   Retunrs: -1 if AbsPad less then in pObj, 1 if more and 0 if they are the same
 130   if     (fPad==((AliHMPIDDigit*)pObj)->Pad()) return  0;
 131   else if(fPad >((AliHMPIDDigit*)pObj)->Pad()) return  1;
 132   else                                         return -1;
 133 }
 134 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 135 Bool_t AliHMPIDDigit::IsInDead(Float_t x,Float_t y)
 136 {
 137 // Check is the current point is outside of sensitive area or in dead zones
 138 // Arguments: x,y -position
 139 //   Returns: 1 if not in sensitive zone
 140   if(x<0 || x>SizeAllX() || y<0 || y>SizeAllY()) return kTRUE; //out of pc
 141
 142   if(x>SizePcX()  && x<SizePcX()+SizeDead())   return kTRUE; //in dead zone along x
 143
 144   if(y>SizePcY()                       && y<SizePcY()+SizeDead())      return kTRUE; //in first dead zone along y
 145   if(y>SizeAllY()-SizePcY()-SizeDead() && y<SizeAllY()-SizePcY())      return kTRUE; //in second dead zone along y
 146   return kFALSE;
 147 }
 148 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 149 Float_t AliHMPIDDigit::Mathieson(Float_t x,Float_t y)const
 150 {
 151 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 152 // Arguments: x,y- position of the center of Mathieson distribution
 153 //  Returns: a charge fraction [0-1] imposed into the pad
 154   const Float_t kSqrtK3=0.77459667,k2=0.962,k4=0.379;
 155
 156   Float_t ux1=kSqrtK3*TMath::TanH(k2*(x-LorsX()+0.5*SizePadX())/0.425);
 157   Float_t ux2=kSqrtK3*TMath::TanH(k2*(x-LorsX()-0.5*SizePadX())/0.425);
 158   Float_t uy1=kSqrtK3*TMath::TanH(k2*(y-LorsY()+0.5*SizePadY())/0.425);
 159   Float_t uy2=kSqrtK3*TMath::TanH(k2*(y-LorsY()-0.5*SizePadY())/0.425);
 160   return 4*k4*(TMath::ATan(ux2)-TMath::ATan(ux1))*k4*(TMath::ATan(uy2)-TMath::ATan(uy1));
 161 }
 162 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 163 Int_t AliHMPIDDigit::Raw(UInt_t &w32)const
 164 {
 165 // Convert digit structure to raw word format
 166 // Arguments: 32 bits raw word to fill
 167 //   Returns: DDL ID where to write this digit
 168   w32=0;
 169   AliBitPacking::PackWord((UInt_t)fQ        ,w32, 0,11);  // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq        Qdc               bits (00..11) counts (0..4095)
 170   AliBitPacking::PackWord(         Addr()   ,w32,12,17);  // 3322 2222 2222 1111 1111 1000 0000 0000        DILOGIC address   bits (12..17) counts (0..47)
 171   AliBitPacking::PackWord(         Dilogic(),w32,18,21);  // 1098 7654 3210 9876 5432 1098 7654 3210        DILOGIC number    bits (18..21) counts (1..10)
 172   AliBitPacking::PackWord(         Row()    ,w32,22,26);  //                                                Row number        bits (22..26) counts (1..24)
 173   return DdlIdx(); //ddl 0..13 where to write this digit
 174 }
 175 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 176 void AliHMPIDDigit::Raw(Int_t ddl,UInt_t w32)
 177 {
 178 // Converts a given raw data word to a digit
 179 // Arguments: w32 - 32 bits raw data word
 180 //            ddl - DDL idx  0 1 2 3 4 ... 13
 181 //   Returns: none
 182         fQ = AliBitPacking::UnpackWord(w32, 0,11);  // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq         Qdc               bits (00..11) counts (0..4095)
 183   UInt_t a = AliBitPacking::UnpackWord(w32,12,17);  // 3322 2222 2222 1111 1111 1000 0000 0000         DILOGIC address   bits (12..17) counts (0..47)
 184   UInt_t d = AliBitPacking::UnpackWord(w32,18,21);  // 1098 7654 3210 9876 5432 1098 7654 3210         DILOGIC number    bits (18..21) counts (1..10)
 185   UInt_t r = AliBitPacking::UnpackWord(w32,22,26);  //                                                 Row number        bits (22..26) counts (1..24)
 186   fPad=Abs(Raw2Ch(ddl),Raw2Pc(ddl,r),Raw2X(d,a),Raw2Y(ddl,r,a));
 187 }
 188 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 189 #endif