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+/**************************************************************************
+ * 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. *
+ **************************************************************************/
+
+/* $Id$ */
+
+<b>//_________________________________________________________________________</b>
+<b>// Implementation version 1 of the clusterization algorithm </b>
+<b>// </b>
+<b>//*-- Author: Yves Schutz (SUBATECH) </b>
+<b>//////////////////////////////////////////////////////////////////////////////</b>
+
+<b>// --- ROOT system ---</b>
+
+#include "TMath.h"
+
+<b>// --- Standard library ---</b>
+
+#include <iostream>
+
+<b>// --- AliRoot header files ---</b>
+
+#include "<a href="../AliPHOSClusterizerv1.h">AliPHOSClusterizerv1.h</a>"
+#include "<a href="../AliPHOSDigit.h">AliPHOSDigit.h</a>"
+#include "<a href="../AliPHOSEmcRecPoint.h">AliPHOSEmcRecPoint.h</a>"
+#include "<a href="../AliPHOSPpsdRecPoint.h">AliPHOSPpsdRecPoint.h</a>"
+#include "<a href="../AliPHOSv0.h">AliPHOSv0.h</a>"
+#include "AliRun.h"
+
+ClassImp(AliPHOSClusterizerv1)
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:AliPHOSClusterizerv1"> </a><a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:AliPHOSClusterizerv1">AliPHOSClusterizerv1::AliPHOSClusterizerv1</a>()
+{
+<b> // default ctor (to be used)</b>
+
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fA">fA</a> = 0.;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fB">fB</a> = 0.01 ;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfEmcClusters">fNumberOfEmcClusters</a> = 0 ;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfPpsdClusters">fNumberOfPpsdClusters</a> = 0 ;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fEmcClusteringThreshold">fEmcClusteringThreshold</a> = 0.1;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fEmcEnergyThreshold">fEmcEnergyThreshold</a> = 0.01;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fPpsdClusteringThreshold">fPpsdClusteringThreshold</a> = 0.00000015;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fPpsdEnergyThreshold">fPpsdEnergyThreshold</a> = 0.0000001;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fW0">fW0</a> = 4.5 ;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fLocMaxCut">fLocMaxCut</a> = 0.06 ;
+}
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:AreNeighbours"> </a><a href="../ListOfTypes.html#Int_t">Int_t</a> <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:AreNeighbours">AliPHOSClusterizerv1::AreNeighbours</a>(<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> * d1, <a href=".././AliPHOSDigit.html">AliPHOSDigit</a> * d2)
+{
+<b> // Gives the neighbourness of two digits = 0 are not neighbour but continue searching </b>
+<b> // = 1 are neighbour</b>
+<b> // = 2 are not neighbour but do not continue searching</b>
+<b> // neighbours are defined as digits having at least common vertex</b>
+<b> // The order of d1 and d2 is important: first (d1) should be a digit already in a cluster </b>
+<b> // which is compared to a digit (d2) not yet in a cluster </b>
+
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> rv = 0 ;
+
+ <a href=".././AliPHOSGeometry.html">AliPHOSGeometry</a> * geom = <a href=".././AliPHOSGeometry.html#AliPHOSGeometry:GetInstance">AliPHOSGeometry::GetInstance</a>() ;
+
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> relid1[4] ;
+ geom->AbsToRelNumbering(d1->GetId(), relid1) ;
+
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> relid2[4] ;
+ geom->AbsToRelNumbering(d2->GetId(), relid2) ;
+
+ if ( (relid1[0] == relid2[0]) && (relid1[1]==relid2[1]) ) { // inside the same PHOS module and the same PPSD Module
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> rowdiff = TMath::Abs( relid1[2] - relid2[2] ) ;
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> coldiff = TMath::Abs( relid1[3] - relid2[3] ) ;
+
+ if (( coldiff <= 1 ) && ( rowdiff <= 1 )){
+ rv = 1 ;
+ }
+ else {
+ if((relid2[2] > relid1[2]) && (relid2[3] > relid1[3]+1))
+ rv = 2; // Difference in row numbers is too large to look further
+ }
+
+ }
+ else {
+
+ if( (relid1[0] < relid2[0]) || (relid1[1] < relid2[1]) )
+ rv=2 ;
+
+ }
+
+ return rv ;
+}
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:FillandSort"> </a><a href="../ListOfTypes.html#void">void</a> <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:FillandSort">AliPHOSClusterizerv1::FillandSort</a>(const <a href="../ListOfTypes.html#DigitsList">DigitsList</a> * dl, TObjArray * tl)
+{
+<b> // Copies the digits with energy above thershold and sorts the list</b>
+<b> // according to increasing Id number</b>
+
+ <a href=".././AliPHOSGeometry.html">AliPHOSGeometry</a> * geom = <a href=".././AliPHOSGeometry.html#AliPHOSGeometry:GetInstance">AliPHOSGeometry::GetInstance</a>() ;
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> relid[4] ;
+
+ TIter next(dl) ;
+ <a href=".././AliPHOSDigit.html">AliPHOSDigit</a> * digit ;
+
+
+
+
+ while ( (digit = (<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> *)next()) ) {
+
+<b>// cout << " clusterizerv1 " << endl ;</b>
+<b>// <a href="../ListOfTypes.html#int">int</a> nprim = digit->GetNprimary() ;</b>
+<b>// <a href="../ListOfTypes.html#int">int</a> * aprim = digit->GetPrimary() ;</b>
+<b>// for ( <a href="../ListOfTypes.html#int">int</a> ii = 0 ; ii < nprim ; ii++)</b>
+<b>// cout << ii << " prim = " << aprim[ii] << endl ;</b>
+
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> id = digit->GetId() ;
+ <a href="../ListOfTypes.html#Float_t">Float_t</a> ene = <a href="#AliPHOSClusterizerv1:Calibrate">Calibrate</a>(digit->GetAmp()) ;
+ geom->AbsToRelNumbering(id, relid) ;
+ if(relid[1]==0){ // EMC
+ if ( ene > <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fEmcEnergyThreshold">fEmcEnergyThreshold</a> )
+ tl->Add(digit) ;
+ }
+
+ else { //Ppsd
+ if ( ene > <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fPpsdEnergyThreshold">fPpsdEnergyThreshold</a> )
+ tl->Add(digit) ;
+ }
+
+ }
+ tl->Sort() ;
+}
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:GetNumberOfClustersFound"> </a><a href="../ListOfTypes.html#void">void</a> <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:GetNumberOfClustersFound">AliPHOSClusterizerv1::GetNumberOfClustersFound</a>(<a href="../ListOfTypes.html#Int_t">Int_t</a> * numb)
+{
+<b> // Fills numb with the number of EMC (numb[0]) clusters found</b>
+<b> // PPSD (numb[1]) clusters found</b>
+
+ numb[0] = <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfEmcClusters">fNumberOfEmcClusters</a> ;
+ numb[1] = <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfPpsdClusters">fNumberOfPpsdClusters</a> ;
+}
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:IsInEmc"> </a><a href="../ListOfTypes.html#Bool_t">Bool_t</a> <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:IsInEmc">AliPHOSClusterizerv1::IsInEmc</a>(<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> * digit)
+{
+<b> // Tells if (true) or not (false) the digit is in a PHOS-EMC module</b>
+
+ <a href="../ListOfTypes.html#Bool_t">Bool_t</a> rv = kFALSE ;
+
+ <a href=".././AliPHOSGeometry.html">AliPHOSGeometry</a> * geom = <a href=".././AliPHOSGeometry.html#AliPHOSGeometry:GetInstance">AliPHOSGeometry::GetInstance</a>() ;
+
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> relid[4] ;
+ geom->AbsToRelNumbering(digit->GetId(), relid) ;
+
+ if ( relid[1] == 0 )
+ rv = kTRUE;
+
+ return rv ;
+}
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:MakeClusters"> </a><a href="../ListOfTypes.html#void">void</a> <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:MakeClusters">AliPHOSClusterizerv1::MakeClusters</a>(const <a href="../ListOfTypes.html#DigitsList">DigitsList</a> * dl, <a href="../ListOfTypes.html#RecPointsList">RecPointsList</a> * emcl, <a href="../ListOfTypes.html#RecPointsList">RecPointsList</a> * ppsdl)
+{
+<b> // Steering method to construct the clusters stored in a list of Reconstructed Points</b>
+<b> // A cluster is defined as a list of neighbour digits</b>
+
+<b> // Fill and sort the working digits list</b>
+ TObjArray tempodigitslist( dl->GetEntries() ) ;
+ <a href="#AliPHOSClusterizerv1:FillandSort">FillandSort</a>(dl, &tempodigitslist) ;
+
+<b> // Clusterization starts </b>
+ TIter nextdigit(&tempodigitslist) ;
+ <a href=".././AliPHOSDigit.html">AliPHOSDigit</a> * digit ;
+ <a href="../ListOfTypes.html#Bool_t">Bool_t</a> notremoved = kTRUE ;
+
+
+ while ( (digit = (<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> *)nextdigit()) ) { // scan over the list of digits
+ <a href=".././AliPHOSRecPoint.html">AliPHOSRecPoint</a> * clu ;
+
+ <a href="../ListOfTypes.html#int">int</a> * clusterdigitslist[dl->GetEntries()] ;
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> index ;
+ if (( ( <a href="#AliPHOSClusterizerv1:IsInEmc">IsInEmc</a>(digit) ) && ( <a href="#AliPHOSClusterizerv1:Calibrate">Calibrate</a>(digit->GetAmp() ) > <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fEmcClusteringThreshold">fEmcClusteringThreshold</a> ) ) ||
+ ( ( !<a href="#AliPHOSClusterizerv1:IsInEmc">IsInEmc</a>(digit) ) && ( <a href="#AliPHOSClusterizerv1:Calibrate">Calibrate</a>(digit->GetAmp() ) > <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fPpsdClusteringThreshold">fPpsdClusteringThreshold</a> ) ) ) {
+
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> iDigitInCluster = 0 ;
+
+ if ( <a href="#AliPHOSClusterizerv1:IsInEmc">IsInEmc</a>(digit) ) {
+ new ((*emcl)[<a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfEmcClusters">fNumberOfEmcClusters</a>]) <a href=".././AliPHOSEmcRecPoint.html">AliPHOSEmcRecPoint</a>(<a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fW0">fW0</a>, <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fLocMaxCut">fLocMaxCut</a>) ; // start a new EMC RecPoint
+ clu = (<a href=".././AliPHOSEmcRecPoint.html">AliPHOSEmcRecPoint</a> *) (*emcl)[<a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfEmcClusters">fNumberOfEmcClusters</a>] ;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfEmcClusters">fNumberOfEmcClusters</a>++ ;
+ clu->AddDigit(*digit, <a href="#AliPHOSClusterizerv1:Calibrate">Calibrate</a>(digit->GetAmp())) ;
+
+ clusterdigitslist[iDigitInCluster] = (<a href="../ListOfTypes.html#int">int</a>* ) digit ;
+ iDigitInCluster++ ;
+ tempodigitslist.Remove(digit) ;
+
+
+ }
+
+ else {
+ new ((*ppsdl)[<a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfPpsdClusters">fNumberOfPpsdClusters</a>]) <a href=".././AliPHOSPpsdRecPoint.html">AliPHOSPpsdRecPoint</a>() ; // start a new PPSD cluster
+ clu = (<a href=".././AliPHOSPpsdRecPoint.html">AliPHOSPpsdRecPoint</a> *) ppsdl->At(<a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfPpsdClusters">fNumberOfPpsdClusters</a>) ;
+ <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fNumberOfPpsdClusters">fNumberOfPpsdClusters</a>++ ;
+ clu->AddDigit(*digit, <a href="#AliPHOSClusterizerv1:Calibrate">Calibrate</a>(digit->GetAmp()) ) ;
+ clusterdigitslist[iDigitInCluster] = (<a href="../ListOfTypes.html#int">int</a>* ) digit ;
+ iDigitInCluster++ ;
+ tempodigitslist.Remove(digit) ;
+ nextdigit.Reset() ;
+
+<b> // Here we remove resting EMC digits, which cannot make cluster</b>
+
+ if( notremoved ) {
+
+ while( ( digit = (<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> *)nextdigit() ) ) {
+
+ if( <a href="#AliPHOSClusterizerv1:IsInEmc">IsInEmc</a>(digit) )
+ tempodigitslist.Remove(digit) ;
+ else
+ break ;
+
+ } // while digit
+
+ } // if notremoved
+
+ } // else
+
+ nextdigit.Reset() ;
+
+ <a href=".././AliPHOSDigit.html">AliPHOSDigit</a> * digitN ;
+ index = 0 ;
+ while (index < iDigitInCluster){ // scan over digits already in cluster
+ digit = (<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> *) clusterdigitslist[index] ;
+ index++ ;
+ while ( (digitN = (<a href=".././AliPHOSDigit.html">AliPHOSDigit</a> *)nextdigit()) ) { // scan over the reduced list of digits
+ <a href="../ListOfTypes.html#Int_t">Int_t</a> ineb = <a href="#AliPHOSClusterizerv1:AreNeighbours">AreNeighbours</a>(digit, digitN); // call (digit,digitN) in THAT oder !!!!!
+ switch (ineb ) {
+ case 0 : // not a neighbour
+ break ;
+ case 1 : // are neighbours
+ clu->AddDigit( *digitN, <a href="#AliPHOSClusterizerv1:Calibrate">Calibrate</a>( digitN->GetAmp() ) ) ;
+ clusterdigitslist[iDigitInCluster] =(<a href="../ListOfTypes.html#int">int</a>*) digitN ;
+ iDigitInCluster++ ;
+ tempodigitslist.Remove(digitN) ;
+ break ;
+ case 2 : // too far from each other
+ goto endofloop;
+ } // switch
+
+ } // while digitN
+
+ endofloop: ;
+ nextdigit.Reset() ;
+
+ } // loop over cluster
+
+ } //below energy theshold
+
+ } // while digit
+
+ tempodigitslist.Clear() ;
+}
+
+<b>//____________________________________________________________________________</b>
+<a name="AliPHOSClusterizerv1:PrintParameters"> </a><a href="../ListOfTypes.html#void">void</a> <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:PrintParameters">AliPHOSClusterizerv1::PrintParameters</a>()
+{
+<b> // Print the energy thresholds </b>
+
+ cout << "PHOS Clusterizer version 1 :" << endl
+ << " EMC Clustering threshold = " << <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fEmcClusteringThreshold">fEmcClusteringThreshold</a> << endl
+ << " EMC Energy threshold = " << <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fEmcEnergyThreshold">fEmcEnergyThreshold</a> << endl
+ << " PPSD Clustering threshold = " << <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fPpsdClusteringThreshold">fPpsdClusteringThreshold</a> << endl
+ << " PPSD Energy threshold = " << <a href=".././AliPHOSClusterizerv1.html#AliPHOSClusterizerv1:fPpsdEnergyThreshold">fPpsdEnergyThreshold</a> << endl ;
+}
+</pre>
+
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