[u/mrichter/AliRoot.git] / ITS / AliITSClusterFinderSPD.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
////////////////////////////////////////////////////////////////////////////
//  Cluster finder                                                       ///
//  for Silicon pixels                                                    // 
//                                                                        //
////////////////////////////////////////////////////////////////////////////        

#include "AliITSClusterFinderSPD.h"
#include "AliITSDetTypeRec.h"
#include "AliITSRawClusterSPD.h"
#include "AliITSRecPoint.h"
#include "AliITSdigitSPD.h"
#include "AliITSsegmentationSPD.h"
#include "AliITSgeom.h"
#include "AliLog.h"

//#define DEBUG

ClassImp(AliITSClusterFinderSPD)

//______________________________________________________________________
AliITSClusterFinderSPD::AliITSClusterFinderSPD():AliITSClusterFinder(),
fDz(0.0),
fDx(0.0),
fMinNCells(0){
    // constructor
}
//----------------------------------------------------------
AliITSClusterFinderSPD::AliITSClusterFinderSPD(AliITSDetTypeRec* dettyp):
AliITSClusterFinder(dettyp),
fDz(0.0),
fDx(0.0),
fMinNCells(0){
    // constructor

    SetDx();
    SetDz();
}
//----------------------------------------------------------
AliITSClusterFinderSPD::AliITSClusterFinderSPD(AliITSDetTypeRec* dettyp,
                                               TClonesArray *digits,
                                               TClonesArray *recp):
AliITSClusterFinder(dettyp,digits),
fDz(0.0),
fDx(0.0),
fMinNCells(0){
    // constructor

    SetDigits(digits);
    SetClusters(recp);
    SetDx();
    SetDz();
}
/*
//______________________________________________________________________
AliITSClusterFinderSPD::AliITSClusterFinderSPD(const AliITSClusterFinderSPD &source) : AliITSClusterFinder(source) {
  // Copy constructor
  // Copies are not allowed. The method is protected to avoid misuse.
  Fatal("AliITSClusterFinderSPD","Copy constructor not allowed\n");
}
*/
//______________________________________________________________________
//AliITSClusterFinderSPD& AliITSClusterFinderSPD::operator=(const AliITSClusterFinderSPD& /* source */){
  // Assignment operator
  // Assignment is not allowed. The method is protected to avoid misuse.
  //Fatal("= operator","Assignment operator not allowed\n");
  //return *this;
//}
//______________________________________________________________________
void AliITSClusterFinderSPD::FindRawClusters(Int_t module){   
    // input of Cluster Finder
    Int_t   digitcount  = 0;
    Int_t   numberd     = 100000;
    Int_t   *digx       = new Int_t[numberd];
    Int_t   *digz       = new Int_t[numberd];
    Int_t   *digtr1     = new Int_t[numberd];
    Int_t   *digtr2     = new Int_t[numberd];
    Int_t   *digtr3     = new Int_t[numberd];
    Int_t   *digtr4     = new Int_t[numberd];
    //  output of Cluster Finder    
    Int_t   numberc     = 10000;
    Double_t *xcenterl   = new Double_t[numberc];
    Double_t *zcenterl   = new Double_t[numberc];
    Double_t *errxcenter = new Double_t[numberc];
    Double_t *errzcenter = new Double_t[numberc];
    Int_t   *tr1clus    = new Int_t[numberc];
    Int_t   *tr2clus    = new Int_t[numberc];
    Int_t   *tr3clus    = new Int_t[numberc];
    Int_t   nclus;

    SetModule(module);
    digitcount=0;
    Int_t ndigits = Digits()->GetEntriesFast();  
    if (!ndigits) return;

    AliITSdigitSPD *dig;
    Int_t ndig=0,i;
    /*
    AliDebug(4," ");
        scanf("%d",&ndig);
    */
    for(ndig=0; ndig<ndigits; ndig++) {
        dig= (AliITSdigitSPD*)GetDigit(ndig);
        digx[digitcount] = dig->GetCoord2()+1;  //starts at 1
        digz[digitcount] = dig->GetCoord1()+1;  //starts at 1
        digtr1[digitcount] = dig->GetTrack(0);
        digtr2[digitcount] = -3;
        digtr3[digitcount] = -3;
        AliDebug(5,Form("digtr1[%d]=%d fTracks[%d]=%d: ",
			digitcount,digtr1[digitcount],0,dig->GetTrack(0)));
        i=1;
        while(digtr1[digitcount]==dig->GetTrack(i) && i<dig->GetNTracks()) i++;
        AliDebug(5,Form(" fTracks[%d]=%d",i,dig->GetTrack(i)));
        if(i<dig->GetNTracks()){
            digtr2[digitcount] = dig->GetTrack(i);
            AliDebug(5,Form("digtr2[%d]=%d: ",digitcount,digtr2[digitcount]));
            while((digtr1[digitcount]==dig->GetTrack(i) || 
                   digtr2[digitcount]==dig->GetTrack(i))&&
                  i<=dig->GetNTracks()) i++;
            if(i<dig->GetNTracks()) digtr3[digitcount] = dig->GetTrack(i);
	    AliDebug(5,Form(" fTracks[%d]=%d digtr3[%d]=%d",
			    i,i<dig->GetNTracks()?dig->GetTrack(i):-1,digitcount,digtr3[digitcount]));
        } // end if
    //        if(GetDebug(4)) cout<<endl;
        digtr4[digitcount] = dig->GetSignal();
        digitcount++;
    } // end for ndig
    ClusterFinder(digitcount,digx,digz,digtr1,digtr2,digtr3,digtr4,
                  nclus,xcenterl,zcenterl,errxcenter,errzcenter,
                  tr1clus, tr2clus, tr3clus);
    DigitToPoint(nclus,xcenterl,zcenterl,errxcenter,errzcenter,
                 tr1clus, tr2clus, tr3clus);
    delete[] digx;
    delete[] digz;
    delete[] digtr1;
    delete[] digtr2;
    delete[] digtr3;
    delete[] digtr4;
    delete[] xcenterl;
    delete[] zcenterl;
    delete[] errxcenter;
    delete[] errzcenter;
    delete[] tr1clus;
    delete[] tr2clus;
    delete[] tr3clus;
}
//----------------------------------------------------------------------
void AliITSClusterFinderSPD::ClusterFinder(Int_t ndigits,Int_t digx[],
					   Int_t digz[],Int_t digtr1[],
					   Int_t digtr2[],Int_t digtr3[],
					   Int_t digtr4[],Int_t &nclus,
					   Double_t xcenter[],Double_t zcenter[],
					   Double_t errxcenter[],
					   Double_t errzcenter[],
					   Int_t tr1clus[],Int_t tr2clus[],
					   Int_t tr3clus[]){
    // Search for clusters of fired pixels (digits). Two digits are linked
    // inside a cluster if they are countiguous both in row or column
    // direction.  Diagonal digits are not linked.
    // xcenter, ycenter, zcenter are the coordinates of the center
    // of each found cluster, calculated from the averaging the corresponding
    // coordinate of the center of the linked digits. The coordinates are
    // given in the local reference sistem. 
    // errxcenter, errycenter, errzcenter are the errors associated to
    // the corresponding average.
    Int_t   if1, min, max, nd;
    Int_t   x1, z1, t1, t2, t3, t4;
    Int_t   ndx, ndz, ndxmin=0, ndxmax=0, ndzmin=0, ndzmax=0;
    Double_t dx, dz; 
    Int_t   i,k,ipos=0;
    Float_t xdum, zdum;      
    Int_t   kmax, sigmax;
    Double_t deltax, deltaz;
    Double_t ndig;
    Int_t   numberd = 10000;
    Int_t   *ifpad  = new Int_t[numberd];
    Int_t   *xpad   = new Int_t[numberd];
    Int_t   *zpad   = new Int_t[numberd];
    Int_t   *tr1pad = new Int_t[numberd];
    Int_t   *tr2pad = new Int_t[numberd];
    Int_t   *tr3pad = new Int_t[numberd];
    Int_t   *tr4pad = new Int_t[numberd];
    Int_t   *iclus  = new Int_t[numberd];

    nclus=1;
    for (i=0; i < ndigits ; i++){
        ifpad[i] = -1;
        iclus[i] = 0;
    } // end for i

    ifpad[0]=0;
    for (i=0; i < ndigits-1 ; i++) {
        if ( ifpad[i] == -1 ) { 
            nclus++;
            ipos++;
            ifpad[i]=nclus-1;
        } // end if ipad[i]
        for (Int_t j=i+1 ; j < ndigits ; j++)  {  
            if (ifpad[j]== -1 ) {
                dx = TMath::Abs(digx[i]-digx[j]);
                dz = TMath::Abs(digz[i]-digz[j]);
                // if ( ( dx+dz )==1 )  //clusters are not diagonal
                if(( dx+dz )==1 || (dx==1 && dz==1)){
                    //diagonal clusters allowed
                    ipos++;
                    ifpad[j] = ifpad[i];
                    
                    x1         = digx[j];
                    z1         = digz[j];
                    digx[j]    = digx[ipos];
                    digz[j]    = digz[ipos];
                    digx[ipos] = x1;
                    digz[ipos] = z1;
                    
                    t1 = digtr1[j];
                    t2 = digtr2[j];
                    t3 = digtr3[j];
                    t4 = digtr4[j];
                    digtr1[j] = digtr1[ipos];
                    digtr2[j] = digtr2[ipos];
                    digtr3[j] = digtr3[ipos];
                    digtr4[j] = digtr4[ipos];
                    digtr1[ipos] = t1;
                    digtr2[ipos] = t2;
                    digtr3[ipos] = t3;
                    digtr4[ipos] = t4;
                    
                    if1 = ifpad[j];
                    ifpad[j] = ifpad[ipos];
                    ifpad[ipos] = if1;
                } // end dx+dx...
            }// end if ifpad[j]== -1 
        } // end for j
    }//end loop on digits
    if ( ifpad[ndigits-1] == -1 ) {
        nclus++;
        ifpad[ndigits-1]=nclus-1;
    } // end if ifpad[ndigits-1] == -1
    
    for (i=0 ; i < ndigits ; i++) iclus[ifpad[i]]++;

    min=0;
    max=0;
    // loop on found clusters 
    for (i=0 ; i < nclus ; i++){
        min = max;
        max += iclus[i];
        deltax = GetSeg()->Dpx(0);
        if (iclus[i]!=1){
            //cluster with more than one digit
            nd=iclus[i];
            ndig=(Double_t) nd;
            Int_t count=0;
            for (k=min;k<min+nd;k++){
                xpad[count] = digx[k];	   
                zpad[count] = digz[k];

                tr1pad[count] = digtr1[k];	   
                tr2pad[count] = digtr2[k];	   
                tr3pad[count] = digtr3[k];	   
                tr4pad[count] = digtr4[k];	   
                
                count++; 
            } // end for k
            ndxmin = xpad[TMath::LocMin(nd,xpad)];
            ndxmax = xpad[TMath::LocMax(nd,xpad)];
            ndzmin = zpad[TMath::LocMin(nd,zpad)];
            ndzmax = zpad[TMath::LocMax(nd,zpad)];
            ndx = ndxmax - ndxmin+1;
            ndz = ndzmax - ndzmin+1;
            
            // calculate x and z coordinates of the center of the cluster
            GetSeg()->GetPadCxz(digx[min],digz[min]-1,xdum, zdum);
            
            if (ndx == 1) {
                xcenter[i] = xdum;
            }else{ 
                xcenter[i] = 0.;
                for (k=0;k<nd;k++) {
                    GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
                    xcenter[i] += (xdum / nd);
                } // end for k               
            } // end if ndx
            
            if (ndz == 1) {
                zcenter[i] = zdum;
            } else {
                zcenter[i] = 0.;
                for (k=0;k<nd;k++) {	      
                    GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
                    zcenter[i] += (zdum / nd);
                } // end for k
            } // end if ndz
            
            // error on points in x and z directions
            
            if (ndx == 1) {
                errxcenter[i] = deltax / TMath::Sqrt(12.);
            } else {
                errxcenter[i] = 0.;	 		
                for (k=0;k<nd;k++){ 
                    GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
                    errxcenter[i] += ((xdum-xcenter[i])*(xdum-xcenter[i]))/
                        (nd*(nd-1)); 
                } // end for k
                errxcenter[i] = TMath::Sqrt(errxcenter[i]);
            } // end if ndx	
            if (ndz == 1) {
                deltaz = GetSeg()->Dpz(digz[min]);	              
                errzcenter[i] = deltaz / TMath::Sqrt(12.);
            } else {
                errzcenter[i] = 0.;
                for (k=0;k<nd;k++){ 
                    GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
                    errzcenter[i] += ((zdum-zcenter[i])*(zdum-zcenter[i]))/
                        (nd*(nd-1));
                } // end for k
                errzcenter[i] = TMath::Sqrt(errzcenter[i]);
            } // end if ndz
            // take three track numbers for the cluster
            // choose the track numbers of the digit with higher signal 
            kmax = 0;
            sigmax = 0;
            for (k=0;k<nd;k++){
                if(tr4pad[k] > sigmax){
                    sigmax = tr4pad[k];
                    kmax   = k;
                } // end if tr4pad[k]
            } // end for k
            if(sigmax != 0) {
                tr1clus[i]= tr1pad[kmax];
                tr2clus[i]= tr2pad[kmax];
                tr3clus[i]= tr3pad[kmax];
            } else {
                tr1clus[i]= -2;
                tr2clus[i]= -2;
                tr3clus[i]= -2;
            } // end if sigmax
        } else {
            // cluster with single digit
            ndig= 1.;
            ndx = 1;
            ndz = 1;
            GetSeg()->GetPadCxz(digx[min],digz[min]-1,xdum,zdum);
            xcenter[i] = xdum;
            zcenter[i] = zdum;
            tr1clus[i]=digtr1[min];
            tr2clus[i]=digtr2[min];
            tr3clus[i]=digtr3[min];
            deltaz = GetSeg()->Dpz(digz[min]);
            errxcenter[i] = deltax / TMath::Sqrt(12.);
            errzcenter[i] = deltaz / TMath::Sqrt(12.);
        } // end if iclus[i]

        // store the cluster information to the AliITSRawCLusterSPD object
   

        //put the cluster center in local reference frame of the detector
        // and in microns
        xcenter[i] = xcenter[i] - GetSeg()->Dx()/2.; 
        zcenter[i] = zcenter[i] - GetSeg()->Dz()/2.;

        AliITSRawClusterSPD *clust = new AliITSRawClusterSPD(zcenter[i], //f
                                                             xcenter[i], //f
                                                             ndig, //f
                                                             ndz,ndx, //ii
                                                             ndxmin,ndxmax,//ii
                                                             (Double_t) ndzmin,
                                                             (Double_t) ndzmax,
                                                             0,GetModule());
	fDetTypeRec->AddCluster(0,clust);
        delete clust;
    }//end loop on clusters   
    delete[] ifpad;
    delete[] xpad ;
    delete[] zpad ;
    delete[] iclus;
    delete[] tr1pad;
    delete[] tr2pad;
    delete[] tr3pad;
    delete[] tr4pad;
}
//______________________________________________________----------------
void AliITSClusterFinderSPD::DigitToPoint(Int_t nclus,
					  Double_t *xcenter,Double_t *zcenter,
					  Double_t *errxcenter,
					  Double_t *errzcenter, 
					  Int_t *tr1clus, Int_t *tr2clus,
					  Int_t *tr3clus){
    // A point is associated to each cluster of SPD digits. The points
    // and their associated errors are stored in the file galiceSP.root.
    Double_t l[3],xg,zg;
    const Double_t kconv = 1.0e-4; // micron -> cm

    Int_t lay,lad,det;
    fDetTypeRec->GetITSgeom()->GetModuleId(fModule,lay,lad,det);
    Int_t ind=(lad-1)*fDetTypeRec->GetITSgeom()->GetNdetectors(lay)+(det-1);
    Int_t lyr=(lay-1);
    // get rec points
    for (Int_t i=0; i<nclus; i++){
        l[0] = kconv*xcenter[i];
        l[1] = kconv*GetSeg()->Dy()/2.;
        l[2] = kconv*zcenter[i];

        xg = l[0]; 
        zg = l[2]; 

        Double_t sigma2x = (kconv*errxcenter[i]) * (kconv*errxcenter[i]);
        Double_t sigma2z = (kconv*errzcenter[i]) * (kconv*errzcenter[i]);

	Int_t lab[4] = {tr1clus[i],tr2clus[i],tr3clus[i],ind};
	Float_t hit[5] = {xg,zg,sigma2x,sigma2z,1.0};
	Int_t info[3] = {0,0,lyr};

        AliITSRecPoint rnew(lab,hit,info,kTRUE);
        rnew.SetdEdX(0.);

	fDetTypeRec->AddRecPoint(rnew); 
    } // end for i
}
Commit	Line	Data
c98c0281	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
04366a57	15	////////////////////////////////////////////////////////////////////////////
	16	// Cluster finder ///
	17	// for Silicon pixels //
	18	// //
	19	////////////////////////////////////////////////////////////////////////////
f77f13c8	20
f77f13c8	21	#include "AliITSClusterFinderSPD.h"
7d62fb64	22	#include "AliITSDetTypeRec.h"
41b19549	23	#include "AliITSRawClusterSPD.h"
c98c0281	24	#include "AliITSRecPoint.h"
f77f13c8	25	#include "AliITSdigitSPD.h"
aacedc3e	26	#include "AliITSsegmentationSPD.h"
6cae184e	27	#include "AliITSgeom.h"
f77f13c8	28	#include "AliLog.h"
c98c0281	29
9e1e0cd7	30	//#define DEBUG
c98c0281	31
	32	ClassImp(AliITSClusterFinderSPD)
	33
aacedc3e	34	//______________________________________________________________________
	35	AliITSClusterFinderSPD::AliITSClusterFinderSPD():AliITSClusterFinder(),
	36	fDz(0.0),
	37	fDx(0.0),
	38	fMinNCells(0){
	39	// constructor
	40	}
c98c0281	41	//----------------------------------------------------------
8ba39da9	42	AliITSClusterFinderSPD::AliITSClusterFinderSPD(AliITSDetTypeRec* dettyp):
8ba39da9	43	AliITSClusterFinder(dettyp),
aacedc3e	44	fDz(0.0),
	45	fDx(0.0),
	46	fMinNCells(0){
9e1e0cd7	47	// constructor
9e1e0cd7	48
c98c0281	49	SetDx();
	50	SetDz();
	51	}
aacedc3e	52	//----------------------------------------------------------
8ba39da9	53	AliITSClusterFinderSPD::AliITSClusterFinderSPD(AliITSDetTypeRec* dettyp,
aacedc3e	54	TClonesArray *digits,
aacedc3e	55	TClonesArray *recp):
8ba39da9	56	AliITSClusterFinder(dettyp,digits),
aacedc3e	57	fDz(0.0),
	58	fDx(0.0),
	59	fMinNCells(0){
9e1e0cd7	60	// constructor
9e1e0cd7	61
aacedc3e	62	SetDigits(digits);
aacedc3e	63	SetClusters(recp);
9e1e0cd7	64	SetDx();
9e1e0cd7	65	SetDz();
c98c0281	66	}
e56160b8	67	/*
9e1e0cd7	68	//______________________________________________________________________
04366a57	69	AliITSClusterFinderSPD::AliITSClusterFinderSPD(const AliITSClusterFinderSPD &source) : AliITSClusterFinder(source) {
	70	// Copy constructor
	71	// Copies are not allowed. The method is protected to avoid misuse.
	72	Fatal("AliITSClusterFinderSPD","Copy constructor not allowed\n");
	73	}
e56160b8	74	*/
04366a57	75	//______________________________________________________________________
e56160b8	76	//AliITSClusterFinderSPD& AliITSClusterFinderSPD::operator=(const AliITSClusterFinderSPD& /* source */){
04366a57	77	// Assignment operator
04366a57	78	// Assignment is not allowed. The method is protected to avoid misuse.
e56160b8	79	//Fatal("= operator","Assignment operator not allowed\n");
	80	//return *this;
	81	//}
9e1e0cd7	82	//______________________________________________________________________
	83	void AliITSClusterFinderSPD::FindRawClusters(Int_t module){
	84	// input of Cluster Finder
	85	Int_t digitcount = 0;
	86	Int_t numberd = 100000;
c98c0281	87	Int_t *digx = new Int_t[numberd];
	88	Int_t *digz = new Int_t[numberd];
	89	Int_t *digtr1 = new Int_t[numberd];
	90	Int_t *digtr2 = new Int_t[numberd];
	91	Int_t *digtr3 = new Int_t[numberd];
	92	Int_t *digtr4 = new Int_t[numberd];
c98c0281	93	// output of Cluster Finder
9e1e0cd7	94	Int_t numberc = 10000;
aacedc3e	95	Double_t *xcenterl = new Double_t[numberc];
	96	Double_t *zcenterl = new Double_t[numberc];
	97	Double_t *errxcenter = new Double_t[numberc];
	98	Double_t *errzcenter = new Double_t[numberc];
c98c0281	99	Int_t *tr1clus = new Int_t[numberc];
	100	Int_t *tr2clus = new Int_t[numberc];
	101	Int_t *tr3clus = new Int_t[numberc];
9e1e0cd7	102	Int_t nclus;
c98c0281	103
aacedc3e	104	SetModule(module);
c98c0281	105	digitcount=0;
aacedc3e	106	Int_t ndigits = Digits()->GetEntriesFast();
c98c0281	107	if (!ndigits) return;
c98c0281	108
ee86d557	109	AliITSdigitSPD *dig;
aacedc3e	110	Int_t ndig=0,i;
5d766c75	111	/*
f77f13c8	112	AliDebug(4," ");
fc9f1fd2	113	scanf("%d",&ndig);
5d766c75	114	*/
c98c0281	115	for(ndig=0; ndig<ndigits; ndig++) {
aacedc3e	116	dig= (AliITSdigitSPD*)GetDigit(ndig);
	117	digx[digitcount] = dig->GetCoord2()+1; //starts at 1
	118	digz[digitcount] = dig->GetCoord1()+1; //starts at 1
	119	digtr1[digitcount] = dig->GetTrack(0);
	120	digtr2[digitcount] = -3;
	121	digtr3[digitcount] = -3;
f77f13c8	122	AliDebug(5,Form("digtr1[%d]=%d fTracks[%d]=%d: ",
f77f13c8	123	digitcount,digtr1[digitcount],0,dig->GetTrack(0)));
aacedc3e	124	i=1;
aacedc3e	125	while(digtr1[digitcount]==dig->GetTrack(i) && i<dig->GetNTracks()) i++;
f77f13c8	126	AliDebug(5,Form(" fTracks[%d]=%d",i,dig->GetTrack(i)));
aacedc3e	127	if(i<dig->GetNTracks()){
aacedc3e	128	digtr2[digitcount] = dig->GetTrack(i);
f77f13c8	129	AliDebug(5,Form("digtr2[%d]=%d: ",digitcount,digtr2[digitcount]));
aacedc3e	130	while((digtr1[digitcount]==dig->GetTrack(i) \|\|
	131	digtr2[digitcount]==dig->GetTrack(i))&&
	132	i<=dig->GetNTracks()) i++;
	133	if(i<dig->GetNTracks()) digtr3[digitcount] = dig->GetTrack(i);
f77f13c8	134	AliDebug(5,Form(" fTracks[%d]=%d digtr3[%d]=%d",
f77f13c8	135	i,i<dig->GetNTracks()?dig->GetTrack(i):-1,digitcount,digtr3[digitcount]));
aacedc3e	136	} // end if
f77f13c8	137	// if(GetDebug(4)) cout<<endl;
aacedc3e	138	digtr4[digitcount] = dig->GetSignal();
aacedc3e	139	digitcount++;
9e1e0cd7	140	} // end for ndig
c98c0281	141	ClusterFinder(digitcount,digx,digz,digtr1,digtr2,digtr3,digtr4,
aacedc3e	142	nclus,xcenterl,zcenterl,errxcenter,errzcenter,
aacedc3e	143	tr1clus, tr2clus, tr3clus);
c98c0281	144	DigitToPoint(nclus,xcenterl,zcenterl,errxcenter,errzcenter,
aacedc3e	145	tr1clus, tr2clus, tr3clus);
9e1e0cd7	146	delete[] digx;
	147	delete[] digz;
	148	delete[] digtr1;
	149	delete[] digtr2;
	150	delete[] digtr3;
	151	delete[] digtr4;
	152	delete[] xcenterl;
	153	delete[] zcenterl;
	154	delete[] errxcenter;
	155	delete[] errzcenter;
	156	delete[] tr1clus;
	157	delete[] tr2clus;
	158	delete[] tr3clus;
c98c0281	159	}
9e1e0cd7	160	//----------------------------------------------------------------------
	161	void AliITSClusterFinderSPD::ClusterFinder(Int_t ndigits,Int_t digx[],
	162	Int_t digz[],Int_t digtr1[],
	163	Int_t digtr2[],Int_t digtr3[],
	164	Int_t digtr4[],Int_t &nclus,
aacedc3e	165	Double_t xcenter[],Double_t zcenter[],
	166	Double_t errxcenter[],
	167	Double_t errzcenter[],
9e1e0cd7	168	Int_t tr1clus[],Int_t tr2clus[],
aacedc3e	169	Int_t tr3clus[]){
9e1e0cd7	170	// Search for clusters of fired pixels (digits). Two digits are linked
	171	// inside a cluster if they are countiguous both in row or column
	172	// direction. Diagonal digits are not linked.
	173	// xcenter, ycenter, zcenter are the coordinates of the center
	174	// of each found cluster, calculated from the averaging the corresponding
	175	// coordinate of the center of the linked digits. The coordinates are
	176	// given in the local reference sistem.
	177	// errxcenter, errycenter, errzcenter are the errors associated to
	178	// the corresponding average.
	179	Int_t if1, min, max, nd;
	180	Int_t x1, z1, t1, t2, t3, t4;
	181	Int_t ndx, ndz, ndxmin=0, ndxmax=0, ndzmin=0, ndzmax=0;
aacedc3e	182	Double_t dx, dz;
9e1e0cd7	183	Int_t i,k,ipos=0;
	184	Float_t xdum, zdum;
	185	Int_t kmax, sigmax;
aacedc3e	186	Double_t deltax, deltaz;
aacedc3e	187	Double_t ndig;
9e1e0cd7	188	Int_t numberd = 10000;
	189	Int_t *ifpad = new Int_t[numberd];
	190	Int_t *xpad = new Int_t[numberd];
	191	Int_t *zpad = new Int_t[numberd];
	192	Int_t *tr1pad = new Int_t[numberd];
	193	Int_t *tr2pad = new Int_t[numberd];
	194	Int_t *tr3pad = new Int_t[numberd];
	195	Int_t *tr4pad = new Int_t[numberd];
	196	Int_t *iclus = new Int_t[numberd];
	197
	198	nclus=1;
	199	for (i=0; i < ndigits ; i++){
aacedc3e	200	ifpad[i] = -1;
aacedc3e	201	iclus[i] = 0;
9e1e0cd7	202	} // end for i
	203
	204	ifpad[0]=0;
	205	for (i=0; i < ndigits-1 ; i++) {
aacedc3e	206	if ( ifpad[i] == -1 ) {
	207	nclus++;
	208	ipos++;
	209	ifpad[i]=nclus-1;
	210	} // end if ipad[i]
	211	for (Int_t j=i+1 ; j < ndigits ; j++) {
	212	if (ifpad[j]== -1 ) {
	213	dx = TMath::Abs(digx[i]-digx[j]);
	214	dz = TMath::Abs(digz[i]-digz[j]);
	215	// if ( ( dx+dz )==1 ) //clusters are not diagonal
	216	if(( dx+dz )==1 \|\| (dx==1 && dz==1)){
	217	//diagonal clusters allowed
	218	ipos++;
	219	ifpad[j] = ifpad[i];
	220
	221	x1 = digx[j];
	222	z1 = digz[j];
	223	digx[j] = digx[ipos];
	224	digz[j] = digz[ipos];
	225	digx[ipos] = x1;
	226	digz[ipos] = z1;
	227
	228	t1 = digtr1[j];
	229	t2 = digtr2[j];
	230	t3 = digtr3[j];
	231	t4 = digtr4[j];
	232	digtr1[j] = digtr1[ipos];
	233	digtr2[j] = digtr2[ipos];
	234	digtr3[j] = digtr3[ipos];
	235	digtr4[j] = digtr4[ipos];
	236	digtr1[ipos] = t1;
	237	digtr2[ipos] = t2;
	238	digtr3[ipos] = t3;
	239	digtr4[ipos] = t4;
	240
	241	if1 = ifpad[j];
	242	ifpad[j] = ifpad[ipos];
	243	ifpad[ipos] = if1;
	244	} // end dx+dx...
	245	}// end if ifpad[j]== -1
	246	} // end for j
9e1e0cd7	247	}//end loop on digits
9e1e0cd7	248	if ( ifpad[ndigits-1] == -1 ) {
aacedc3e	249	nclus++;
aacedc3e	250	ifpad[ndigits-1]=nclus-1;
9e1e0cd7	251	} // end if ifpad[ndigits-1] == -1
aacedc3e	252
9e1e0cd7	253	for (i=0 ; i < ndigits ; i++) iclus[ifpad[i]]++;
	254
	255	min=0;
	256	max=0;
	257	// loop on found clusters
	258	for (i=0 ; i < nclus ; i++){
aacedc3e	259	min = max;
	260	max += iclus[i];
	261	deltax = GetSeg()->Dpx(0);
	262	if (iclus[i]!=1){
	263	//cluster with more than one digit
	264	nd=iclus[i];
	265	ndig=(Double_t) nd;
	266	Int_t count=0;
	267	for (k=min;k<min+nd;k++){
	268	xpad[count] = digx[k];
	269	zpad[count] = digz[k];
9e1e0cd7	270
aacedc3e	271	tr1pad[count] = digtr1[k];
	272	tr2pad[count] = digtr2[k];
	273	tr3pad[count] = digtr3[k];
	274	tr4pad[count] = digtr4[k];
	275
	276	count++;
	277	} // end for k
	278	ndxmin = xpad[TMath::LocMin(nd,xpad)];
	279	ndxmax = xpad[TMath::LocMax(nd,xpad)];
	280	ndzmin = zpad[TMath::LocMin(nd,zpad)];
	281	ndzmax = zpad[TMath::LocMax(nd,zpad)];
	282	ndx = ndxmax - ndxmin+1;
	283	ndz = ndzmax - ndzmin+1;
	284
	285	// calculate x and z coordinates of the center of the cluster
	286	GetSeg()->GetPadCxz(digx[min],digz[min]-1,xdum, zdum);
	287
	288	if (ndx == 1) {
	289	xcenter[i] = xdum;
	290	}else{
	291	xcenter[i] = 0.;
	292	for (k=0;k<nd;k++) {
	293	GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
	294	xcenter[i] += (xdum / nd);
	295	} // end for k
	296	} // end if ndx
	297
	298	if (ndz == 1) {
	299	zcenter[i] = zdum;
	300	} else {
	301	zcenter[i] = 0.;
	302	for (k=0;k<nd;k++) {
	303	GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
	304	zcenter[i] += (zdum / nd);
	305	} // end for k
	306	} // end if ndz
	307
	308	// error on points in x and z directions
	309
	310	if (ndx == 1) {
	311	errxcenter[i] = deltax / TMath::Sqrt(12.);
	312	} else {
	313	errxcenter[i] = 0.;
	314	for (k=0;k<nd;k++){
	315	GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
	316	errxcenter[i] += ((xdum-xcenter[i])*(xdum-xcenter[i]))/
	317	(nd*(nd-1));
	318	} // end for k
	319	errxcenter[i] = TMath::Sqrt(errxcenter[i]);
	320	} // end if ndx
	321	if (ndz == 1) {
	322	deltaz = GetSeg()->Dpz(digz[min]);
	323	errzcenter[i] = deltaz / TMath::Sqrt(12.);
	324	} else {
	325	errzcenter[i] = 0.;
	326	for (k=0;k<nd;k++){
	327	GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum);
	328	errzcenter[i] += ((zdum-zcenter[i])*(zdum-zcenter[i]))/
	329	(nd*(nd-1));
	330	} // end for k
	331	errzcenter[i] = TMath::Sqrt(errzcenter[i]);
	332	} // end if ndz
	333	// take three track numbers for the cluster
	334	// choose the track numbers of the digit with higher signal
335	kmax = 0;
336	sigmax = 0;
337	for (k=0;k<nd;k++){
338	if(tr4pad[k] > sigmax){
339	sigmax = tr4pad[k];
340	kmax = k;
341	} // end if tr4pad[k]
342	} // end for k
343	if(sigmax != 0) {
344	tr1clus[i]= tr1pad[kmax];
345	tr2clus[i]= tr2pad[kmax];
346	tr3clus[i]= tr3pad[kmax];
347	} else {
348	tr1clus[i]= -2;
349	tr2clus[i]= -2;
350	tr3clus[i]= -2;
351	} // end if sigmax
352	} else {
353	// cluster with single digit
354	ndig= 1.;
355	ndx = 1;
356	ndz = 1;
357	GetSeg()->GetPadCxz(digx[min],digz[min]-1,xdum,zdum);
358	xcenter[i] = xdum;
359	zcenter[i] = zdum;
360	tr1clus[i]=digtr1[min];
361	tr2clus[i]=digtr2[min];
362	tr3clus[i]=digtr3[min];
363	deltaz = GetSeg()->Dpz(digz[min]);
364	errxcenter[i] = deltax / TMath::Sqrt(12.);
365	errzcenter[i] = deltaz / TMath::Sqrt(12.);
366	} // end if iclus[i]
9e1e0cd7	367
aacedc3e	368	// store the cluster information to the AliITSRawCLusterSPD object
04366a57	369
9e1e0cd7	370
aacedc3e	371	//put the cluster center in local reference frame of the detector
	372	// and in microns
	373	xcenter[i] = xcenter[i] - GetSeg()->Dx()/2.;
	374	zcenter[i] = zcenter[i] - GetSeg()->Dz()/2.;
9e1e0cd7	375
aacedc3e	376	AliITSRawClusterSPD *clust = new AliITSRawClusterSPD(zcenter[i], //f
	377	xcenter[i], //f
	378	ndig, //f
	379	ndz,ndx, //ii
	380	ndxmin,ndxmax,//ii
	381	(Double_t) ndzmin,
	382	(Double_t) ndzmax,
	383	0,GetModule());
7d62fb64	384	fDetTypeRec->AddCluster(0,clust);
aacedc3e	385	delete clust;
9e1e0cd7	386	}//end loop on clusters
	387	delete[] ifpad;
	388	delete[] xpad ;
	389	delete[] zpad ;
	390	delete[] iclus;
	391	delete[] tr1pad;
	392	delete[] tr2pad;
	393	delete[] tr3pad;
	394	delete[] tr4pad;
c98c0281	395	}
9e1e0cd7	396	//______________________________________________________----------------
c98c0281	397	void AliITSClusterFinderSPD::DigitToPoint(Int_t nclus,
aacedc3e	398	Double_t xcenter,Double_t zcenter,
	399	Double_t *errxcenter,
	400	Double_t *errzcenter,
9e1e0cd7	401	Int_t tr1clus, Int_t tr2clus,
	402	Int_t *tr3clus){
	403	// A point is associated to each cluster of SPD digits. The points
	404	// and their associated errors are stored in the file galiceSP.root.
aacedc3e	405	Double_t l[3],xg,zg;
aacedc3e	406	const Double_t kconv = 1.0e-4; // micron -> cm
9e1e0cd7	407
00a7cc50	408	Int_t lay,lad,det;
	409	fDetTypeRec->GetITSgeom()->GetModuleId(fModule,lay,lad,det);
	410	Int_t ind=(lad-1)*fDetTypeRec->GetITSgeom()->GetNdetectors(lay)+(det-1);
	411	Int_t lyr=(lay-1);
9e1e0cd7	412	// get rec points
9e1e0cd7	413	for (Int_t i=0; i<nclus; i++){
c98c0281	414	l[0] = kconv*xcenter[i];
aacedc3e	415	l[1] = kconv*GetSeg()->Dy()/2.;
c98c0281	416	l[2] = kconv*zcenter[i];
	417
	418	xg = l[0];
	419	zg = l[2];
	420
aacedc3e	421	Double_t sigma2x = (kconverrxcenter[i]) (kconv*errxcenter[i]);
aacedc3e	422	Double_t sigma2z = (kconverrzcenter[i]) (kconv*errzcenter[i]);
75fb37cc	423
	424	Int_t lab[4] = {tr1clus[i],tr2clus[i],tr3clus[i],ind};
	425	Float_t hit[5] = {xg,zg,sigma2x,sigma2z,1.0};
	426	Int_t info[3] = {0,0,lyr};
	427
	428	AliITSRecPoint rnew(lab,hit,info,kTRUE);
c98c0281	429	rnew.SetdEdX(0.);
75fb37cc	430
7d62fb64	431	fDetTypeRec->AddRecPoint(rnew);
9e1e0cd7	432	} // end for i
c98c0281	433	}