[u/mrichter/AliRoot.git] / TPC / AliSimDigits.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.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  Alice segment manager object                                             //
//  AliSimDigits object   (derived from AliDigits)                           //
//  provide additional track information to digit                            //
//   Origin: Marian Ivanov  GSI Darmstadt                                    //
//                                                                           //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include "TClass.h"
#include <Riostream.h>
#include "TError.h"
#include "AliSegmentID.h"
#include "AliH2F.h"
#include "AliArrayI.h"
#include "AliArrayS.h"
#include "AliDigits.h"
#include "AliSimDigits.h"
#include "AliTPC.h"
#include <TClonesArray.h>


//_____________________________________________________________________________
//_____________________________________________________________________________
//_____________________________________________________________________________
ClassImp(AliSimDigits)

AliSimDigits::AliSimDigits()
{
  //  AliDigits::Invalite();
  fTracks = 0;
  fTrIndex = 0;  
  InvalidateTrack();
}
AliSimDigits::~AliSimDigits()
{

  if (fTracks != 0) {
    delete fTracks;
  }
  if (fTrIndex != 0) { 
    delete fTrIndex;
  } 

}

void AliSimDigits::InvalidateTrack() 
{ 
  //
  //set default (invalid parameters)
  if ( fTracks != 0) delete fTracks;
  fTracks = new AliArrayI;
  if ( fTrIndex  != 0) delete fTrIndex;
  fTrIndex = new AliArrayI;

  for (Int_t i = 0; i<3; i++){
    fTracks->Set(0);
    fTrIndex->Set(0);
  }
}

void  AliSimDigits::AllocateTrack(Int_t length)
{
  //
  //construct empty buffer fElements and fTracks with size fNrows x fNcols x
  //length 
  InvalidateTrack();
  fNlevel = length;
  fTracks->Set(fNcols*fNrows*fNlevel);
  fTrIndex->Set(0); 
  fTrBufType =0;
}

Int_t AliSimDigits::GetTrackID(Int_t row, Int_t column, Int_t level) 
{
  //
  //Get track ID 
  if (fTrBufType == 0) return  GetTrackIDFast(row, column,level);
  if (fTrBufType == 1) return  GetTrackID1(row, column,level); 
  if (fTrBufType == 2) return  GetTrackID2(row, column,level); 
  return 0;
}

void AliSimDigits::ExpandTrackBuffer()
{  
  //
  //expand buffer to two dimensional array 
  if (fTrBufType<0)  {
    Error("ExpandBuffer", "buffer doesn't exist");
    return;
  }
  if (fTrBufType==0)      return;  //buffer expanded
  if (fTrBufType==1)  {ExpandTrackBuffer1(); return;}
  if (fTrBufType==2)  ExpandTrackBuffer2();
 
}

void AliSimDigits::CompresTrackBuffer(Int_t bufType)
{
  //
  //compres buffer according buffertype algorithm
  //
  if (fTrBufType<0)  {
    Error("CompressBuffer", "buffer doesn't exist");
    return;
  }
  if (fTrBufType == bufType) return;
  //
  if (fTrBufType>0) ExpandTrackBuffer();
  if (fTrBufType !=0)  {
    Error("CompressBuffer", "buffer doesn't exist");
    return;
  }
  //compress buffer of type 1
  
  if (bufType==1)      {CompresTrackBuffer1();return;}
  if (bufType==2)      CompresTrackBuffer2();
   
}

Int_t  AliSimDigits::GetTrackID1(Int_t row, Int_t column, Int_t level)
{
  //return  track ID of digits - for buffer compresion 2
  Int_t i,n1,n2;
  i = level*fNcols+column;
  if ( (i+1)>=fTrIndex->fN) n2 = fTracks->fN;
  else 
    n2 = fTrIndex->At(i+1);
  n1 = fTrIndex->At(i);
  Int_t rownew = 0;
  Int_t rowold=0;
  Int_t id;
  for (i = n1;(i<n2);i++){
    id = 0;
    Int_t num = fTracks->At(i);
    if (num<0) {
      rownew-=num;  
      rowold = rownew;
      i++;
      if (i<n2){
	num = fTracks->At(i);
	rownew+=num;
	i++;
	id = fTracks->At(i);
      }
    }
    else {
      rowold = rownew;
      rownew+=num;
      i++;
      id = fTracks->At(i);
    }
    id-=2;
    if ( (row>=rowold) && (row<=rownew) ) return id;
    if (row < rownew ) return -2; //empty track
  }
  return -2;
}

void  AliSimDigits::ExpandTrackBuffer1()
{
  //
  //expand  track compressed according algorithm 1 (track id comression independent to the digit compression)
  // !!in expanded tracks we don't use fTrIndex array
  //  
  fTrBufType = 0;
  Int_t i,j;
  Int_t all   = fNrows*fNcols;  //total number of digits
  Int_t elems = all*fNlevel;  //length of the buffer

  AliArrayI * buf = new AliArrayI;
  buf->Set(elems);
  fTrIndex->Set(0);
  //
  Int_t level = 0;
  Int_t col=0;
  Int_t row = 0;
  Int_t n=fTracks->fN;
  //
  for (i=0;i<n;i++){
    //oposite signa means how many unwrited (under threshold) values
    Int_t num = fTracks->At(i);
    if (num<0) row-=num;   //negative number mean number of zeroes (no tracks of gibven level no need to write to array) 
    else {
      i++;
      Int_t id =  fTracks->At(i);
      for (j = 0; j<num; j++,row++) (*buf)[level*all+col*fNrows+row]=id;       
    }
    if (row>=fNrows) {
      row=0;
      col++;
    }
    if (col>=fNcols) {
      col=0;
      level++;
    }    
  }//end of loop over digits
  delete fTracks;
  fTracks = buf;
}

void  AliSimDigits::CompresTrackBuffer1()
{
  //
  //comress track according algorithm 1 (track id comression independent to the digit compression)
  //
  fTrBufType = 1;  

  AliArrayI *  buf = new AliArrayI;   //create  new buffer 
  buf->Set(fNrows*fNcols*fNlevel); //lets have the nearly the "worst case"
  AliArrayI *  index = new AliArrayI;
  index->Set(fNcols*fNlevel);
  //  Int_t * pindex = 

  
  Int_t icurrent=-1;  //current index
  Int_t izero;      //number of zero
  Int_t inum;      //number of digits  with the same current track id  
  Int_t lastID =0;  //last track id  
  
  Int_t *cbuff=fTracks->GetArray(); //MI change

  for (Int_t lev =0; lev<fNlevel; lev++){    //loop over levels 
    for (Int_t col = 0; col<fNcols; col++){    //loop over columns
      izero = 0;
      inum =  0;
      lastID = 0;
      (*index)[lev*fNcols+col]=icurrent+1;//set collumn pointer
      Int_t id=0;  //current id
      for (Int_t row = 0; row< fNrows;row++){ //loop over rows        
	id = *cbuff;  //MI change
	//	id = GetTrackIDFast(row,col,lev);
	if (id <= 0) {
	  if ( inum> 0 ) { //if we have some tracks in buffer
	    icurrent++;
	    if ((icurrent+1)>=buf->fN) buf->Expand(icurrent*2+1); //MI change - allocate +1
	    (*buf)[icurrent] = inum;
	    icurrent++;
	    (*buf)[icurrent] = lastID;	
	    inum = 0;      
	    lastID = 0;
	  }
	  izero++;
	}
	else
          if (id != lastID) 
	    if ( izero > 0 ) { 
	      //if we have currently izero count of non tracks digits
	      icurrent++;	  
	      if (icurrent>=buf->fN) buf->Expand(icurrent*2+1);
	      (*buf)[icurrent]= -izero;  //write how many under zero
	      inum++;
	      izero = 0;	     
	      lastID = id;
	    }
	    else{ 
	      //if we change track id from another track id	    
	      icurrent++;	  
	      if ((icurrent+1)>=buf->fN) buf->Expand(icurrent*2+1);
	      (*buf)[icurrent] = inum;
	      icurrent++;
	      (*buf)[icurrent] = lastID;	
	      lastID = id;
	      inum = 1;      
	      izero = 0;
	    }	
	  else {	  
	    inum++;
	  }
	cbuff++;  //MI change
      }//end of loop over row
      if ( izero > 0 ) { 
	//if we have currently izero count of non tracks digits
	icurrent++;	  
	if (icurrent>=buf->fN) buf->Expand(icurrent*2);
	(*buf)[icurrent]= -izero;  //write how many under zero	
      }
      if ( inum> 0 ) { //if we have some tracks in buffer
	icurrent++;
	if ((icurrent+1)>=buf->fN) buf->Expand(icurrent*2);
	(*buf)[icurrent] = inum;
	icurrent++;
	(*buf)[icurrent] = id;	
      }      
    }//end of loop over columns
  }//end of loop over differnet track level  
  buf->Expand(icurrent+1);
  delete fTracks;
  fTracks = buf;
  delete fTrIndex;
  fTrIndex = index;
}


void  AliSimDigits::ExpandTrackBuffer2()
{
  //
  //comress track according algorithm 2 (track id comression according  digit compression)
  fTrBufType = 0;
}

void  AliSimDigits::CompresTrackBuffer2()
{
  //
  //comress track according algorithm 2 (track id comression according  digit compression)
  fTrBufType = 2;
}


Int_t  AliSimDigits::GetTrackID2(Int_t /*row*/, Int_t /*column*/, Int_t /*level*/)
{
  //returnb track id of digits - for buffer compresion 2
  return -2;
}


AliH2F *  AliSimDigits::DrawTracks( const char *option,Int_t level, 
			      Float_t x1, Float_t x2, Float_t y1, Float_t y2)
{
  //
  //draw digits in given array
  //  
  //make digits histo 
  char ch[30];
  sprintf(ch,"Track Segment_%d level %d ",GetID(),level );
  if ( (fNrows<1)|| (fNcols<1)) {
    return 0;
  }
  AliH2F * his  = new AliH2F("Track histo",ch,fNrows,0,fNrows,fNcols,0,fNcols);
  ExpandTrackBuffer();
  //set histogram  values
  for (Int_t i = 0; i<fNrows;i++)    
    for (Int_t j = 0; j<fNcols;j++)
        his->Fill(i,j,GetTrackIDFast(i,j,level));
  if (x1>=0) {
      AliH2F *h2fsub = his->GetSubrange2d(x1,x2,y1,y2);
      delete his;
      his=h2fsub;
  }
  if (his==0) return 0;
  if (option!=0) his->Draw(option);
  else his->Draw();
  return his;  
}

TClonesArray *  AliSimDigits::GenerTPCClonesArray(TClonesArray * arr)
{
  //
  //generate TClonnesArray of digits
  //
  TClonesArray * digits;
  if (arr==0)  digits=new TClonesArray("AliTPCdigit",300);
  else digits = arr; 
  Int_t index = digits->GetEntriesFast();
  for (Int_t row =0; row<fNrows; row++)
    for (Int_t col =0; col<fNcols; col++){
      Int_t amp = GetDigit(row,col);
      if (amp>GetThreshold()){
	AliTPCdigit dig;
	dig.fPad = col;
	dig.fTime = row;
	dig.fSignal= amp;
	dig.fPadRow =fSegmentID;
	dig.fSector =fSegmentID;
	dig.GetTracks()[0]= GetTrackID(row,col,0);
	dig.GetTracks()[1]= GetTrackID(row,col,1);
	dig.GetTracks()[2]= GetTrackID(row,col,2);
	TClonesArray &ldigits = *digits;
	new(ldigits[index++]) AliTPCdigit(dig);
      }
    }    
  return digits;
}
Commit	Line	Data
cc80f89e	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	**************************************************************************/
	15
88cb7938	16	/* $Id$ */
cc80f89e	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	// //
	20	// Alice segment manager object //
88cb7938	21	// AliSimDigits object (derived from AliDigits) //
cc80f89e	22	// provide additional track information to digit //
88cb7938	23	// Origin: Marian Ivanov GSI Darmstadt //
88cb7938	24	// //
cc80f89e	25	// //
cc80f89e	26	///////////////////////////////////////////////////////////////////////////////
	27
	28	#include "TClass.h"
19364939	29	#include <Riostream.h>
cc80f89e	30	#include "TError.h"
	31	#include "AliSegmentID.h"
	32	#include "AliH2F.h"
	33	#include "AliArrayI.h"
	34	#include "AliArrayS.h"
	35	#include "AliDigits.h"
	36	#include "AliSimDigits.h"
	37	#include "AliTPC.h"
c4aa8648	38	#include <TClonesArray.h>
cc80f89e	39
	40
	41
	42	//_____________________________________________________________________________
	43	//_____________________________________________________________________________
	44	//_____________________________________________________________________________
	45	ClassImp(AliSimDigits)
	46
	47	AliSimDigits::AliSimDigits()
	48	{
	49	// AliDigits::Invalite();
	50	fTracks = 0;
	51	fTrIndex = 0;
	52	InvalidateTrack();
	53	}
	54	AliSimDigits::~AliSimDigits()
	55	{
c4aa8648	56
	57	if (fTracks != 0) {
	58	delete fTracks;
	59	}
	60	if (fTrIndex != 0) {
	61	delete fTrIndex;
	62	}
cc80f89e	63
	64	}
	65
	66	void AliSimDigits::InvalidateTrack()
	67	{
	68	//
	69	//set default (invalid parameters)
	70	if ( fTracks != 0) delete fTracks;
	71	fTracks = new AliArrayI;
	72	if ( fTrIndex != 0) delete fTrIndex;
	73	fTrIndex = new AliArrayI;
	74
	75	for (Int_t i = 0; i<3; i++){
	76	fTracks->Set(0);
	77	fTrIndex->Set(0);
	78	}
	79	}
	80
	81	void AliSimDigits::AllocateTrack(Int_t length)
	82	{
	83	//
	84	//construct empty buffer fElements and fTracks with size fNrows x fNcols x
	85	//length
	86	InvalidateTrack();
	87	fNlevel = length;
	88	fTracks->Set(fNcolsfNrowsfNlevel);
	89	fTrIndex->Set(0);
	90	fTrBufType =0;
	91	}
	92
	93	Int_t AliSimDigits::GetTrackID(Int_t row, Int_t column, Int_t level)
	94	{
	95	//
	96	//Get track ID
	97	if (fTrBufType == 0) return GetTrackIDFast(row, column,level);
	98	if (fTrBufType == 1) return GetTrackID1(row, column,level);
	99	if (fTrBufType == 2) return GetTrackID2(row, column,level);
	100	return 0;
	101	}
	102
	103	void AliSimDigits::ExpandTrackBuffer()
	104	{
	105	//
	106	//expand buffer to two dimensional array
	107	if (fTrBufType<0) {
	108	Error("ExpandBuffer", "buffer doesn't exist");
	109	return;
	110	}
	111	if (fTrBufType==0) return; //buffer expanded
	112	if (fTrBufType==1) {ExpandTrackBuffer1(); return;}
	113	if (fTrBufType==2) ExpandTrackBuffer2();
	114
	115	}
	116
	117	void AliSimDigits::CompresTrackBuffer(Int_t bufType)
	118	{
	119	//
	120	//compres buffer according buffertype algorithm
	121	//
	122	if (fTrBufType<0) {
	123	Error("CompressBuffer", "buffer doesn't exist");
	124	return;
	125	}
	126	if (fTrBufType == bufType) return;
127	//
128	if (fTrBufType>0) ExpandTrackBuffer();
129	if (fTrBufType !=0) {
130	Error("CompressBuffer", "buffer doesn't exist");
131	return;
132	}
133	//compress buffer of type 1
134
135	if (bufType==1) {CompresTrackBuffer1();return;}
136	if (bufType==2) CompresTrackBuffer2();
137
138	}
139
140	Int_t AliSimDigits::GetTrackID1(Int_t row, Int_t column, Int_t level)
141	{
142	//return track ID of digits - for buffer compresion 2
143	Int_t i,n1,n2;
144	i = level*fNcols+column;
145	if ( (i+1)>=fTrIndex->fN) n2 = fTracks->fN;
146	else
147	n2 = fTrIndex->At(i+1);
148	n1 = fTrIndex->At(i);
149	Int_t rownew = 0;
150	Int_t rowold=0;
73042f01	151	Int_t id;
cc80f89e	152	for (i = n1;(i<n2);i++){
73042f01	153	id = 0;
cc80f89e	154	Int_t num = fTracks->At(i);
	155	if (num<0) {
	156	rownew-=num;
	157	rowold = rownew;
	158	i++;
	159	if (i<n2){
	160	num = fTracks->At(i);
	161	rownew+=num;
	162	i++;
73042f01	163	id = fTracks->At(i);
cc80f89e	164	}
	165	}
	166	else {
	167	rowold = rownew;
	168	rownew+=num;
	169	i++;
73042f01	170	id = fTracks->At(i);
cc80f89e	171	}
73042f01	172	id-=2;
73042f01	173	if ( (row>=rowold) && (row<=rownew) ) return id;
cc80f89e	174	if (row < rownew ) return -2; //empty track
	175	}
	176	return -2;
	177	}
	178
	179	void AliSimDigits::ExpandTrackBuffer1()
	180	{
	181	//
73042f01	182	//expand track compressed according algorithm 1 (track id comression independent to the digit compression)
cc80f89e	183	// !!in expanded tracks we don't use fTrIndex array
	184	//
	185	fTrBufType = 0;
	186	Int_t i,j;
	187	Int_t all = fNrows*fNcols; //total number of digits
	188	Int_t elems = all*fNlevel; //length of the buffer
	189
	190	AliArrayI * buf = new AliArrayI;
	191	buf->Set(elems);
	192	fTrIndex->Set(0);
	193	//
	194	Int_t level = 0;
	195	Int_t col=0;
	196	Int_t row = 0;
73042f01	197	Int_t n=fTracks->fN;
cc80f89e	198	//
73042f01	199	for (i=0;i<n;i++){
cc80f89e	200	//oposite signa means how many unwrited (under threshold) values
	201	Int_t num = fTracks->At(i);
	202	if (num<0) row-=num; //negative number mean number of zeroes (no tracks of gibven level no need to write to array)
	203	else {
	204	i++;
73042f01	205	Int_t id = fTracks->At(i);
73042f01	206	for (j = 0; j<num; j++,row++) (buf)[levelall+col*fNrows+row]=id;
cc80f89e	207	}
	208	if (row>=fNrows) {
	209	row=0;
	210	col++;
	211	}
	212	if (col>=fNcols) {
	213	col=0;
	214	level++;
	215	}
	216	}//end of loop over digits
	217	delete fTracks;
	218	fTracks = buf;
	219	}
	220
	221	void AliSimDigits::CompresTrackBuffer1()
	222	{
	223	//
73042f01	224	//comress track according algorithm 1 (track id comression independent to the digit compression)
cc80f89e	225	//
	226	fTrBufType = 1;
	227
	228	AliArrayI * buf = new AliArrayI; //create new buffer
	229	buf->Set(fNrowsfNcolsfNlevel); //lets have the nearly the "worst case"
	230	AliArrayI * index = new AliArrayI;
	231	index->Set(fNcols*fNlevel);
407ff276	232	// Int_t * pindex =
cc80f89e	233
407ff276	234
cc80f89e	235	Int_t icurrent=-1; //current index
cc80f89e	236	Int_t izero; //number of zero
73042f01	237	Int_t inum; //number of digits with the same current track id
407ff276	238	Int_t lastID =0; //last track id
	239
	240	Int_t *cbuff=fTracks->GetArray(); //MI change
	241
cc80f89e	242	for (Int_t lev =0; lev<fNlevel; lev++){ //loop over levels
	243	for (Int_t col = 0; col<fNcols; col++){ //loop over columns
	244	izero = 0;
	245	inum = 0;
	246	lastID = 0;
	247	(index)[levfNcols+col]=icurrent+1;//set collumn pointer
73042f01	248	Int_t id=0; //current id
407ff276	249	for (Int_t row = 0; row< fNrows;row++){ //loop over rows
	250	id = *cbuff; //MI change
	251	// id = GetTrackIDFast(row,col,lev);
73042f01	252	if (id <= 0) {
cc80f89e	253	if ( inum> 0 ) { //if we have some tracks in buffer
cc80f89e	254	icurrent++;
a6bc70e0	255	if ((icurrent+1)>=buf->fN) buf->Expand(icurrent*2+1); //MI change - allocate +1
cc80f89e	256	(*buf)[icurrent] = inum;
	257	icurrent++;
	258	(*buf)[icurrent] = lastID;
	259	inum = 0;
	260	lastID = 0;
	261	}
	262	izero++;
	263	}
	264	else
73042f01	265	if (id != lastID)
cc80f89e	266	if ( izero > 0 ) {
	267	//if we have currently izero count of non tracks digits
	268	icurrent++;
a6bc70e0	269	if (icurrent>=buf->fN) buf->Expand(icurrent*2+1);
cc80f89e	270	(*buf)[icurrent]= -izero; //write how many under zero
	271	inum++;
	272	izero = 0;
73042f01	273	lastID = id;
cc80f89e	274	}
cc80f89e	275	else{
73042f01	276	//if we change track id from another track id
cc80f89e	277	icurrent++;
a6bc70e0	278	if ((icurrent+1)>=buf->fN) buf->Expand(icurrent*2+1);
cc80f89e	279	(*buf)[icurrent] = inum;
	280	icurrent++;
	281	(*buf)[icurrent] = lastID;
73042f01	282	lastID = id;
cc80f89e	283	inum = 1;
	284	izero = 0;
	285	}
	286	else {
	287	inum++;
	288	}
407ff276	289	cbuff++; //MI change
407ff276	290	}//end of loop over row
cc80f89e	291	if ( izero > 0 ) {
	292	//if we have currently izero count of non tracks digits
	293	icurrent++;
	294	if (icurrent>=buf->fN) buf->Expand(icurrent*2);
	295	(*buf)[icurrent]= -izero; //write how many under zero
	296	}
	297	if ( inum> 0 ) { //if we have some tracks in buffer
	298	icurrent++;
	299	if ((icurrent+1)>=buf->fN) buf->Expand(icurrent*2);
	300	(*buf)[icurrent] = inum;
	301	icurrent++;
73042f01	302	(*buf)[icurrent] = id;
cc80f89e	303	}
	304	}//end of loop over columns
	305	}//end of loop over differnet track level
	306	buf->Expand(icurrent+1);
	307	delete fTracks;
	308	fTracks = buf;
	309	delete fTrIndex;
	310	fTrIndex = index;
	311	}
	312
	313
	314
	315	void AliSimDigits::ExpandTrackBuffer2()
	316	{
	317	//
73042f01	318	//comress track according algorithm 2 (track id comression according digit compression)
cc80f89e	319	fTrBufType = 0;
	320	}
	321
	322	void AliSimDigits::CompresTrackBuffer2()
	323	{
	324	//
73042f01	325	//comress track according algorithm 2 (track id comression according digit compression)
cc80f89e	326	fTrBufType = 2;
	327	}
	328
	329
176aff27	330	Int_t AliSimDigits::GetTrackID2(Int_t /row/, Int_t /column/, Int_t /level/)
cc80f89e	331	{
73042f01	332	//returnb track id of digits - for buffer compresion 2
cc80f89e	333	return -2;
	334	}
	335
	336
	337
	338	AliH2F * AliSimDigits::DrawTracks( const char *option,Int_t level,
	339	Float_t x1, Float_t x2, Float_t y1, Float_t y2)
	340	{
	341	//
	342	//draw digits in given array
	343	//
	344	//make digits histo
	345	char ch[30];
	346	sprintf(ch,"Track Segment_%d level %d ",GetID(),level );
	347	if ( (fNrows<1)\|\| (fNcols<1)) {
	348	return 0;
	349	}
	350	AliH2F * his = new AliH2F("Track histo",ch,fNrows,0,fNrows,fNcols,0,fNcols);
	351	ExpandTrackBuffer();
	352	//set histogram values
	353	for (Int_t i = 0; i<fNrows;i++)
	354	for (Int_t j = 0; j<fNcols;j++)
	355	his->Fill(i,j,GetTrackIDFast(i,j,level));
	356	if (x1>=0) {
	357	AliH2F *h2fsub = his->GetSubrange2d(x1,x2,y1,y2);
	358	delete his;
	359	his=h2fsub;
	360	}
	361	if (his==0) return 0;
	362	if (option!=0) his->Draw(option);
	363	else his->Draw();
	364	return his;
	365	}
	366
	367	TClonesArray * AliSimDigits::GenerTPCClonesArray(TClonesArray * arr)
	368	{
	369	//
	370	//generate TClonnesArray of digits
	371	//
	372	TClonesArray * digits;
	373	if (arr==0) digits=new TClonesArray("AliTPCdigit",300);
	374	else digits = arr;
	375	Int_t index = digits->GetEntriesFast();
	376	for (Int_t row =0; row<fNrows; row++)
	377	for (Int_t col =0; col<fNcols; col++){
	378	Int_t amp = GetDigit(row,col);
	379	if (amp>GetThreshold()){
	380	AliTPCdigit dig;
	381	dig.fPad = col;
	382	dig.fTime = row;
	383	dig.fSignal= amp;
	384	dig.fPadRow =fSegmentID;
	385	dig.fSector =fSegmentID;
116cbefd	386	dig.GetTracks()[0]= GetTrackID(row,col,0);
	387	dig.GetTracks()[1]= GetTrackID(row,col,1);
	388	dig.GetTracks()[2]= GetTrackID(row,col,2);
cc80f89e	389	TClonesArray &ldigits = *digits;
	390	new(ldigits[index++]) AliTPCdigit(dig);
	391	}
	392	}
	393	return digits;
	394	}
	395