#ifndef ALIPMDCLUSTERING_H
#define ALIPMDCLUSTERING_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

//-----------------------------------------------------//
//                                                     //
//  Header File : PMDClustering.h, Version 00          //
//                                                     //
//  Date   : September 26 2002                         //
//                                                     //
//  clustering code for alice pmd                      //
//                                                     //
//-----------------------------------------------------//
/* 
   --------------------------------------------------------------------
   Code developed by S. C. Phatak, Institute of Physics, 
   Bhubaneswar 751 005 ( phatak@iopb.res.in ) Given the energy deposited
   ( or ADC value ) in each cell of supermodule ( pmd or cpv ), the code
   builds up superclusters and breaks them into clusters. The input is 
   in array d[ndimx][ndimy] and cluster information is in array
   clusters[5][5000]. integer clno gives total number of clusters in the 
   supermodule.

   d, clno  and clusters are the only global ( public ) variables. Others 
   are local ( private ) to the code. 

   At the moment, the data is read for whole detector ( all supermodules
   and pmd as well as cpv. This will have to be modify later )

   LAST UPDATE  :  October 23, 2002
-----------------------------------------------------------------------
*/

#include "Rtypes.h"

class TNtuple;
class TObjArray;
class AliPMDcluster;
class AliPMDClustering
{

 public:
  AliPMDClustering();
  virtual ~AliPMDClustering();
  
  void DoClust(Double_t celladc[][96], TObjArray *pmdcont);
  void Order();

  Int_t CrClust(Double_t ave, Double_t cutoff, Int_t nmx1);
  void RefClust(Int_t incr);
  void GaussFit(Int_t ncell, Int_t nclust, Double_t &x, 
		Double_t &y, Double_t &z, Double_t &xc,
		Double_t &yc, Double_t &zc, Double_t &rc);
  Double_t Distance(Double_t x1, Double_t y1,
		    Double_t x2, Double_t y2);
  Double_t Ranmar() const;
  void SetEdepCut(Float_t decut);
  void SetDebug(Int_t idebug);
  
 protected:

  static const Double_t fgkSqroot3by2;  // fgkSqroot3by2 = sqrt(3.)/2.
  enum {
    kNMX   = 4608,
    kNDIMX = 48,
    kNDIMY = 96
  };

  /*
    kNMX   : # of cells in a supermodule
    kNDIMX : maximum number of cells along x direction (origin at one corner)
    kNDIMY : maximum number of cells along axis at 60 degrees with x axis
  */

  Double_t fEdepCell[kNDIMX][kNDIMY]; //energy(ADC) in each cell of the supermodule
  Double_t fClusters[5][5000]; // Cluster informations
  Int_t    fClno;   // number of clusters in a supermodule

  /*
    clusters[0][i] --- x position of the cluster center
    clusters[1][i] --- y position of the cluster center
    clusters[2][i] --- total energy in the cluster
    clusters[3][i] --- number of cells forming the cluster 
                       ( possibly fractional )
    clusters[4][i] --- cluster radius
  */

  Int_t    fIord[2][kNMX]; // ordered list of i and j according to decreasing energy dep.
  Int_t    fInfocl[2][kNDIMX][kNDIMY]; // cellwise information on the cluster to which the cell
  Int_t    fInfcl[3][kNMX]; // cluster information [0][i] -- cluster number
  Double_t fCoord[2][kNDIMX][kNDIMY];

  /* 
     fIord --- ordered list of i and j according to decreasing energy dep.
     fInfocl --- cellwise information on the cluster to which the cell
     belongs and whether it has largest energy dep. or not
     ( now redundant - probably )
     fInfcl ---  cluster information [0][i] -- cluster number
     [1][i] -- i of the cell
     [2][i] -- j of the cell
     coord --- x and y coordinates of center of each cell
  */

  Int_t fDebug;    // Switch for debug (1:Print, 0:Noprint)
  Float_t fCutoff; // Energy(ADC) cutoff per cell before clustering

  ClassDef(AliPMDClustering,2) // Does clustering for PMD
};
#endif