[u/mrichter/AliRoot.git] / PHOS / AliPHOSGeometry.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.                  *
 **************************************************************************/

/* $Id$ */

//_________________________________________________________________________
// Geometry class  for PHOS : singleton  
// PHOS consists of the electromagnetic calorimeter (EMCA)
// and a charged particle veto either in the Subatech's version (PPSD)
// or in the IHEP's one (CPV).
// The EMCA/PPSD/CPV modules are parametrized so that any configuration
// can be easily implemented 
// The title is used to identify the version of CPV used.
//                  
//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH)

// --- ROOT system ---

#include "TVector3.h"
#include "TRotation.h" 
#include "TFolder.h" 
#include "TROOT.h" 

// --- Standard library ---

#include <stdlib.h>

// --- AliRoot header files ---

#include "AliPHOSGeometry.h"
#include "AliPHOSEMCAGeometry.h" 
#include "AliPHOSRecPoint.h"
#include "AliConst.h"

ClassImp(AliPHOSGeometry) ;

// these initialisations are needed for a singleton
AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
Bool_t            AliPHOSGeometry::fgInit = kFALSE ;

//____________________________________________________________________________
AliPHOSGeometry::~AliPHOSGeometry(void)
{
  // dtor

  if (fRotMatrixArray) fRotMatrixArray->Delete() ; 
  if (fRotMatrixArray) delete fRotMatrixArray ; 
  if (fPHOSAngle     ) delete[] fPHOSAngle ; 
}
//____________________________________________________________________________

void AliPHOSGeometry::Init(void)
{
  // Initializes the PHOS parameters :
  //  IHEP is the Protvino CPV (cathode pad chambers)
  
  TString test(GetName()) ; 
  if (test != "IHEP" ) {
    Fatal("Init", "%s is not a known geometry (choose among IHEP)", test.Data() ) ; 
  }

  fgInit     = kTRUE ; 
  
  fNModules     = 5;
  fAngle        = 20;
  
  fGeometryEMCA = new AliPHOSEMCAGeometry();
  
  fGeometryCPV  = new AliPHOSCPVGeometry ();
  
  fGeometrySUPP = new AliPHOSSupportGeometry();
  
  fPHOSAngle = new Float_t[fNModules] ;
  
  Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
  
  fPHOSParams[0] =  TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2., 
			       (Double_t)(emcParams[0]*(fGeometryCPV->GetCPVBoxSize(1)+emcParams[3]) - 
				emcParams[1]* fGeometryCPV->GetCPVBoxSize(1))/emcParams[3] ) ;
  fPHOSParams[1] = emcParams[1] ;
  fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
  fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
  
  fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
  
  Int_t index ;
  for ( index = 0; index < fNModules; index++ )
    fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
  
  this->SetPHOSAngles() ; 
  fRotMatrixArray = new TObjArray(fNModules) ; 
  
}

//____________________________________________________________________________
AliPHOSGeometry *  AliPHOSGeometry::GetInstance() 
{ 
  // Returns the pointer of the unique instance; singleton specific
  
  return static_cast<AliPHOSGeometry *>( fgGeom ) ; 
}

//____________________________________________________________________________
AliPHOSGeometry *  AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title) 
{
  // Returns the pointer of the unique instance
  // Creates it with the specified options (name, title) if it does not exist yet

  AliPHOSGeometry * rv = 0  ; 
  if ( fgGeom == 0 ) {
    if ( strcmp(name,"") == 0 ) 
      rv = 0 ;
    else {    
      fgGeom = new AliPHOSGeometry(name, title) ;
      if ( fgInit )
	rv = (AliPHOSGeometry * ) fgGeom ;
      else {
	rv = 0 ; 
	delete fgGeom ; 
	fgGeom = 0 ; 
      }
    }
  }
  else {
    if ( strcmp(fgGeom->GetName(), name) != 0 ) 
      ::Error("GetInstance", "Current geometry is %s. You cannot call %s", fgGeom->GetName(), name) ; 
    else
      rv = (AliPHOSGeometry *) fgGeom ; 
  } 
  return rv ; 
}

//____________________________________________________________________________
void AliPHOSGeometry::SetPHOSAngles() 
{ 
  // Calculates the position of the PHOS modules in ALICE global coordinate system
  
  Double_t const kRADDEG = 180.0 / TMath::Pi() ;
  Float_t pphi =  2 * TMath::ATan( GetOuterBoxSize(0)  / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
  pphi *= kRADDEG ;
  if (pphi > fAngle){ 
    Error("SetPHOSAngles", "PHOS modules overlap!\n pphi = %f fAngle = %f", pphi, fAngle);

  }
  pphi = fAngle;
  
  for( Int_t i = 1; i <= fNModules ; i++ ) {
    Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
    fPHOSAngle[i-1] = -  angle ;
  } 
}

//____________________________________________________________________________
Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * relid) const
{
  // Converts the absolute numbering into the following array/
  //  relid[0] = PHOS Module number 1:fNModules 
  //  relid[1] = 0 if PbW04
  //           = -1 if CPV
  //  relid[2] = Row number inside a PHOS module
  //  relid[3] = Column number inside a PHOS module

  Bool_t rv  = kTRUE ; 
  Float_t id = AbsId ;

  Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ; 
  
  if ( phosmodulenumber >  GetNModules() ) { // it is a CPV pad
    
    id -=  GetNPhi() * GetNZ() *  GetNModules() ; 
    Float_t nCPV  = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
    relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
    relid[1] = -1 ;
    id -= ( relid[0] - 1 ) * nCPV ; 
    relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
    relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ; 
  } 
  else { // it is a PW04 crystal

    relid[0] = phosmodulenumber ;
    relid[1] = 0 ;
    id -= ( phosmodulenumber - 1 ) *  GetNPhi() * GetNZ() ; 
    relid[2] = (Int_t)TMath::Ceil( id / GetNZ() )  ;
    relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ; 
  } 
  return rv ; 
}

//____________________________________________________________________________  
void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const 
{
  // calculates the angular coverage in theta and phi of one EMC (=PHOS) module

 Double_t conv ; 
  if ( opt == Radian() ) 
    conv = 1. ; 
  else if ( opt == Degre() )
    conv = 180. / TMath::Pi() ; 
  else {
    Warning("EmcModuleCoverage", "%s unknown option; result in radian", opt) ; 
    conv = 1. ;
      }

  Float_t phi = GetPHOSAngle(mod) *  (TMath::Pi() / 180.)  ;  
  Float_t y0  = GetIPtoCrystalSurface() ; 
  Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
  Float_t x0  = fGeometryEMCA->GetNStripX()*strip[0] ;
  Float_t z0  = fGeometryEMCA->GetNStripZ()*strip[2] ;
  Double_t angle = TMath::ATan( x0 / y0 ) ;
  phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
  Double_t max  = phi - angle ;
  Double_t min   = phi + angle ;
  pM = TMath::Max(max, min) * conv ;
  pm = TMath::Min(max, min) * conv ; 
  
  angle =  TMath::ATan( z0 /  y0 ) ;
  max  = TMath::Pi() / 2.  + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
  min  = TMath::Pi() / 2.  - angle ;
  tM = TMath::Max(max, min) * conv ;
  tm = TMath::Min(max, min) * conv ; 
 
}

//____________________________________________________________________________  
void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
{
  // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module

  Double_t conv ; 
  if ( opt == Radian() ) 
    conv = 1. ; 
  else if ( opt == Degre() )
    conv = 180. / TMath::Pi() ; 
  else {
    Warning("EmcXtalCoverage", "%s unknown option; result in radian", opt) ;  
    conv = 1. ;
      }

  Float_t y0  = GetIPtoCrystalSurface() ; 
  theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
  phi   = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
}
 

//____________________________________________________________________________
void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & gmat) const
{
  // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
 
  AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;  
  TVector3 localposition ;

  tmpPHOS->GetLocalPosition(gpos) ;


  if ( tmpPHOS->IsEmc() ) // it is a EMC crystal 
    {  gpos.SetY( - GetIPtoCrystalSurface()) ;  

    }
  else
    { // it is a CPV
      gpos.SetY(- GetIPtoUpperCPVsurface()  ) ; 
    }  

  Float_t phi           = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; 
  Double_t const kRADDEG = 180.0 / TMath::Pi() ;
  Float_t rphi          = phi / kRADDEG ; 
  
  TRotation rot ;
  rot.RotateZ(-rphi) ; // a rotation around Z by angle  
  
  TRotation dummy = rot.Invert() ;  // to transform from original frame to rotate frame
  gpos.Transform(rot) ; // rotate the baby 
  gmat = 0;             // Not implemented yet

}

//____________________________________________________________________________
void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const 
{
  // Calculates the coordinates of a RecPoint in the ALICE global coordinate system 

  AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;  
  TVector3 localposition ;
  tmpPHOS->GetLocalPosition(gpos) ;


  if ( tmpPHOS->IsEmc() ) // it is a EMC crystal 
    {  gpos.SetY( - GetIPtoCrystalSurface()  ) ;  
    }
  else
    { // it is a CPV
	  gpos.SetY(- GetIPtoUpperCPVsurface()  ) ; 
    }  

  Float_t phi           = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; 
  Double_t const kRADDEG = 180.0 / TMath::Pi() ;
  Float_t rphi          = phi / kRADDEG ; 
  
  TRotation rot ;
  rot.RotateZ(-rphi) ; // a rotation around Z by angle  
  
  TRotation dummy = rot.Invert() ;  // to transform from original frame to rotate frame
  gpos.Transform(rot) ; // rotate the baby 
}

//____________________________________________________________________________
void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) const
{
  // calculates the impact coordinates on PHOS of a neutral particle  
  // emitted in the direction theta and phi in the ALICE global coordinate system

  // searches for the PHOS EMC module
  ModuleNumber = 0 ; 
  Double_t tm, tM, pm, pM ; 
  Int_t index = 1 ; 
  while ( ModuleNumber == 0 && index <= GetNModules() ) { 
    EmcModuleCoverage(index, tm, tM, pm, pM) ; 
    if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) ) 
      ModuleNumber = index ; 
    index++ ;    
  }
  if ( ModuleNumber != 0 ) {
    Float_t phi0 =  GetPHOSAngle(ModuleNumber) *  (TMath::Pi() / 180.) + 1.5 * TMath::Pi()  ;  
    Float_t y0  =  GetIPtoCrystalSurface()  ;   
    Double_t angle = phi - phi0; 
    x = y0 * TMath::Tan(angle) ; 
    angle = theta - TMath::Pi() / 2 ; 
    z = y0 * TMath::Tan(angle) ; 
  }
}

Bool_t  AliPHOSGeometry::Impact(const TParticle * particle) const 
{
  Bool_t In=kFALSE;
  Int_t ModuleNumber=0;
  Double_t z,x;
  ImpactOnEmc(particle->Theta(),particle->Phi(),ModuleNumber,z,x);
  if(ModuleNumber) In=kTRUE;
  else In=kFALSE;
  return In;
}

//____________________________________________________________________________
Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t &  AbsId) const
{
  // Converts the relative numbering into the absolute numbering
  // EMCA crystals:
  //  AbsId = from 1 to fNModules * fNPhi * fNZ
  // CPV pad:
  //  AbsId = from N(total PHOS crystals) + 1
  //          to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ

  Bool_t rv = kTRUE ; 
  
  if ( relid[1] ==  0 ) {                            // it is a Phos crystal
    AbsId =
      ( relid[0] - 1 ) * GetNPhi() * GetNZ()         // the offset of PHOS modules
      + ( relid[2] - 1 ) * GetNZ()                   // the offset along phi
      +   relid[3] ;                                 // the offset along z
  }
  else { // it is a CPV pad
    AbsId =    GetNPhi() * GetNZ() *  GetNModules()         // the offset to separate EMCA crystals from CPV pads
      + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ()   // the pads offset of PHOS modules 
      + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ()                             // the pads offset of a CPV row
      +   relid[3] ;                                                         // the column number
  }
  
  return rv ; 
}

//____________________________________________________________________________

void AliPHOSGeometry::RelPosInAlice(const Int_t id, TVector3 & pos ) const
{
  // Converts the absolute numbering into the global ALICE coordinate system
  
    
    Int_t relid[4] ;
    
    AbsToRelNumbering(id , relid) ;
    
    Int_t phosmodule = relid[0] ; 
    
    Float_t y0 = 0 ; 
    
    if ( relid[1] == 0 )  // it is a PbW04 crystal 
      y0 =  - GetIPtoCrystalSurface() ;  
    else
      y0 =  - GetIPtoUpperCPVsurface() ; 

    Float_t x, z ; 
    RelPosInModule(relid, x, z) ; 
    
    pos.SetX(x) ;
    pos.SetZ(z) ;
    pos.SetY(y0) ;
    
    Float_t phi           = GetPHOSAngle( phosmodule) ; 
    Double_t const kRADDEG = 180.0 / TMath::Pi() ;
    Float_t rphi          = phi / kRADDEG ; 
    
    TRotation rot ;
    rot.RotateZ(-rphi) ; // a rotation around Z by angle  
    
    TRotation dummy = rot.Invert() ;  // to transform from original frame to rotate frame
    
    pos.Transform(rot) ; // rotate the baby 
} 

//____________________________________________________________________________
void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const 
{
  // Converts the relative numbering into the local PHOS-module (x, z) coordinates
  // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
  
  Int_t row        = relid[2] ; //offset along x axis
  Int_t column     = relid[3] ; //offset along z axis

  
  if ( relid[1] == 0 ) { // its a PbW04 crystal
    x = - ( GetNPhi()/2. - row    + 0.5 ) *  GetCellStep() ; // position of Xtal with respect
    z =   ( GetNZ()  /2. - column + 0.5 ) *  GetCellStep() ; // of center of PHOS module  
  }  
  else  {    
    x = - ( GetNumberOfCPVPadsPhi()/2. - row    - 0.5 ) * GetPadSizePhi()  ; // position of pad  with respect
    z =   ( GetNumberOfCPVPadsZ()  /2. - column - 0.5 ) * GetPadSizeZ()  ; // of center of PHOS module  
  }
}
Commit	Line	Data
d15a28e7	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
b2a60966	16	/* $Id$ */
b2a60966	17
d15a28e7	18	//_________________________________________________________________________
b2a60966	19	// Geometry class for PHOS : singleton
a3dfe79c	20	// PHOS consists of the electromagnetic calorimeter (EMCA)
	21	// and a charged particle veto either in the Subatech's version (PPSD)
	22	// or in the IHEP's one (CPV).
	23	// The EMCA/PPSD/CPV modules are parametrized so that any configuration
	24	// can be easily implemented
	25	// The title is used to identify the version of CPV used.
b2a60966	26	//
710f859a	27	//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH)
d15a28e7	28
	29	// --- ROOT system ---
	30
	31	#include "TVector3.h"
	32	#include "TRotation.h"
fa7cce36	33	#include "TFolder.h"
fa7cce36	34	#include "TROOT.h"
d15a28e7	35
	36	// --- Standard library ---
	37
4410223b	38	#include <stdlib.h>
d15a28e7	39
	40	// --- AliRoot header files ---
	41
	42	#include "AliPHOSGeometry.h"
468794ea	43	#include "AliPHOSEMCAGeometry.h"
710f859a	44	#include "AliPHOSRecPoint.h"
d15a28e7	45	#include "AliConst.h"
d15a28e7	46
9ec91567	47	ClassImp(AliPHOSGeometry) ;
d15a28e7	48
a4e98857	49	// these initialisations are needed for a singleton
9ec91567	50	AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
282c5906	51	Bool_t AliPHOSGeometry::fgInit = kFALSE ;
9ec91567	52
d15a28e7	53	//____________________________________________________________________________
	54	AliPHOSGeometry::~AliPHOSGeometry(void)
	55	{
b2a60966	56	// dtor
b2a60966	57
52a36ffd	58	if (fRotMatrixArray) fRotMatrixArray->Delete() ;
52a36ffd	59	if (fRotMatrixArray) delete fRotMatrixArray ;
fa0bc588	60	if (fPHOSAngle ) delete[] fPHOSAngle ;
52a36ffd	61	}
52a36ffd	62	//____________________________________________________________________________
	63
	64	void AliPHOSGeometry::Init(void)
	65	{
a4e98857	66	// Initializes the PHOS parameters :
a4e98857	67	// IHEP is the Protvino CPV (cathode pad chambers)
710f859a	68
809cd394	69	TString test(GetName()) ;
22b8277f	70	if (test != "IHEP" ) {
22b8277f	71	Fatal("Init", "%s is not a known geometry (choose among IHEP)", test.Data() ) ;
809cd394	72	}
809cd394	73
710f859a	74	fgInit = kTRUE ;
	75
	76	fNModules = 5;
	77	fAngle = 20;
	78
	79	fGeometryEMCA = new AliPHOSEMCAGeometry();
	80
	81	fGeometryCPV = new AliPHOSCPVGeometry ();
	82
	83	fGeometrySUPP = new AliPHOSSupportGeometry();
	84
	85	fPHOSAngle = new Float_t[fNModules] ;
	86
	87	Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
	88
581e32d4	89	fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2.,
581e32d4	90	(Double_t)(emcParams[0]*(fGeometryCPV->GetCPVBoxSize(1)+emcParams[3]) -
710f859a	91	emcParams[1]* fGeometryCPV->GetCPVBoxSize(1))/emcParams[3] ) ;
710f859a	92	fPHOSParams[1] = emcParams[1] ;
581e32d4	93	fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
710f859a	94	fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
	95
	96	fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
	97
	98	Int_t index ;
	99	for ( index = 0; index < fNModules; index++ )
52a36ffd	100	fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
710f859a	101
	102	this->SetPHOSAngles() ;
	103	fRotMatrixArray = new TObjArray(fNModules) ;
	104
52a36ffd	105	}
	106
	107	//____________________________________________________________________________
	108	AliPHOSGeometry * AliPHOSGeometry::GetInstance()
	109	{
a4e98857	110	// Returns the pointer of the unique instance; singleton specific
a4e98857	111
809cd394	112	return static_cast<AliPHOSGeometry *>( fgGeom ) ;
52a36ffd	113	}
	114
	115	//____________________________________________________________________________
	116	AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
	117	{
	118	// Returns the pointer of the unique instance
a4e98857	119	// Creates it with the specified options (name, title) if it does not exist yet
a4e98857	120
52a36ffd	121	AliPHOSGeometry * rv = 0 ;
	122	if ( fgGeom == 0 ) {
	123	if ( strcmp(name,"") == 0 )
	124	rv = 0 ;
	125	else {
	126	fgGeom = new AliPHOSGeometry(name, title) ;
	127	if ( fgInit )
	128	rv = (AliPHOSGeometry * ) fgGeom ;
	129	else {
	130	rv = 0 ;
	131	delete fgGeom ;
	132	fgGeom = 0 ;
	133	}
	134	}
	135	}
	136	else {
21cd0c07	137	if ( strcmp(fgGeom->GetName(), name) != 0 )
21cd0c07	138	::Error("GetInstance", "Current geometry is %s. You cannot call %s", fgGeom->GetName(), name) ;
52a36ffd	139	else
	140	rv = (AliPHOSGeometry *) fgGeom ;
	141	}
	142	return rv ;
	143	}
4697edca	144
52a36ffd	145	//____________________________________________________________________________
	146	void AliPHOSGeometry::SetPHOSAngles()
	147	{
a4e98857	148	// Calculates the position of the PHOS modules in ALICE global coordinate system
52a36ffd	149
a8c47ab6	150	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
710f859a	151	Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
52a36ffd	152	pphi *= kRADDEG ;
710f859a	153	if (pphi > fAngle){
21cd0c07	154	Error("SetPHOSAngles", "PHOS modules overlap!\n pphi = %f fAngle = %f", pphi, fAngle);
710f859a	155
710f859a	156	}
ed4205d8	157	pphi = fAngle;
52a36ffd	158
52a36ffd	159	for( Int_t i = 1; i <= fNModules ; i++ ) {
ed4205d8	160	Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
52a36ffd	161	fPHOSAngle[i-1] = - angle ;
52a36ffd	162	}
d15a28e7	163	}
	164
	165	//____________________________________________________________________________
7b7c1533	166	Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * relid) const
d15a28e7	167	{
b2a60966	168	// Converts the absolute numbering into the following array/
	169	// relid[0] = PHOS Module number 1:fNModules
	170	// relid[1] = 0 if PbW04
710f859a	171	// = -1 if CPV
	172	// relid[2] = Row number inside a PHOS module
	173	// relid[3] = Column number inside a PHOS module
d15a28e7	174
d15a28e7	175	Bool_t rv = kTRUE ;
92862013	176	Float_t id = AbsId ;
d15a28e7	177
710f859a	178	Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
d15a28e7	179
710f859a	180	if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
	181
	182	id -= GetNPhi() * GetNZ() * GetNModules() ;
	183	Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
	184	relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
	185	relid[1] = -1 ;
	186	id -= ( relid[0] - 1 ) * nCPV ;
	187	relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
	188	relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ;
d15a28e7	189	}
710f859a	190	else { // it is a PW04 crystal
d15a28e7	191
92862013	192	relid[0] = phosmodulenumber ;
	193	relid[1] = 0 ;
	194	id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
710f859a	195	relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
710f859a	196	relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
d15a28e7	197	}
	198	return rv ;
	199	}
52a36ffd	200
9f616d61	201	//____________________________________________________________________________
7b7c1533	202	void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
9f616d61	203	{
a4e98857	204	// calculates the angular coverage in theta and phi of one EMC (=PHOS) module
9f616d61	205
9f616d61	206	Double_t conv ;
cf0c2bc1	207	if ( opt == Radian() )
9f616d61	208	conv = 1. ;
cf0c2bc1	209	else if ( opt == Degre() )
9f616d61	210	conv = 180. / TMath::Pi() ;
9f616d61	211	else {
21cd0c07	212	Warning("EmcModuleCoverage", "%s unknown option; result in radian", opt) ;
9f616d61	213	conv = 1. ;
	214	}
	215
710f859a	216	Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
710f859a	217	Float_t y0 = GetIPtoCrystalSurface() ;
88cb7938	218	Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
	219	Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ;
	220	Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ;
	221	Double_t angle = TMath::ATan( x0 / y0 ) ;
710f859a	222	phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
92862013	223	Double_t max = phi - angle ;
	224	Double_t min = phi + angle ;
	225	pM = TMath::Max(max, min) * conv ;
	226	pm = TMath::Min(max, min) * conv ;
9f616d61	227
88cb7938	228	angle = TMath::ATan( z0 / y0 ) ;
92862013	229	max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
	230	min = TMath::Pi() / 2. - angle ;
	231	tM = TMath::Max(max, min) * conv ;
	232	tm = TMath::Min(max, min) * conv ;
9f616d61	233
	234	}
	235
	236	//____________________________________________________________________________
7b7c1533	237	void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
9f616d61	238	{
a4e98857	239	// calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
9f616d61	240
9f616d61	241	Double_t conv ;
cf0c2bc1	242	if ( opt == Radian() )
9f616d61	243	conv = 1. ;
cf0c2bc1	244	else if ( opt == Degre() )
9f616d61	245	conv = 180. / TMath::Pi() ;
9f616d61	246	else {
21cd0c07	247	Warning("EmcXtalCoverage", "%s unknown option; result in radian", opt) ;
9f616d61	248	conv = 1. ;
	249	}
	250
710f859a	251	Float_t y0 = GetIPtoCrystalSurface() ;
92862013	252	theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
92862013	253	phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
9f616d61	254	}
	255
	256
	257	//____________________________________________________________________________
52a36ffd	258	void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & gmat) const
d15a28e7	259	{
a4e98857	260	// Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
b2a60966	261
d15a28e7	262	AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013	263	TVector3 localposition ;
d15a28e7	264
	265	tmpPHOS->GetLocalPosition(gpos) ;
	266
	267
	268	if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a	269	{ gpos.SetY( - GetIPtoCrystalSurface()) ;
d15a28e7	270
	271	}
	272	else
710f859a	273	{ // it is a CPV
710f859a	274	gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7	275	}
d15a28e7	276
92862013	277	Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
a8c47ab6	278	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
92862013	279	Float_t rphi = phi / kRADDEG ;
d15a28e7	280
92862013	281	TRotation rot ;
92862013	282	rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7	283
92862013	284	TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
92862013	285	gpos.Transform(rot) ; // rotate the baby
a8c47ab6	286	gmat = 0; // Not implemented yet
6ad0bfa0	287
d15a28e7	288	}
	289
	290	//____________________________________________________________________________
5cda30f6	291	void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
d15a28e7	292	{
a4e98857	293	// Calculates the coordinates of a RecPoint in the ALICE global coordinate system
b2a60966	294
d15a28e7	295	AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013	296	TVector3 localposition ;
d15a28e7	297	tmpPHOS->GetLocalPosition(gpos) ;
	298
	299
	300	if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a	301	{ gpos.SetY( - GetIPtoCrystalSurface() ) ;
d15a28e7	302	}
d15a28e7	303	else
710f859a	304	{ // it is a CPV
710f859a	305	gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7	306	}
d15a28e7	307
92862013	308	Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
a8c47ab6	309	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
92862013	310	Float_t rphi = phi / kRADDEG ;
d15a28e7	311
92862013	312	TRotation rot ;
92862013	313	rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7	314
92862013	315	TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
92862013	316	gpos.Transform(rot) ; // rotate the baby
d15a28e7	317	}
	318
	319	//____________________________________________________________________________
7b7c1533	320	void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) const
d15a28e7	321	{
a4e98857	322	// calculates the impact coordinates on PHOS of a neutral particle
a4e98857	323	// emitted in the direction theta and phi in the ALICE global coordinate system
d15a28e7	324
52a36ffd	325	// searches for the PHOS EMC module
	326	ModuleNumber = 0 ;
	327	Double_t tm, tM, pm, pM ;
	328	Int_t index = 1 ;
	329	while ( ModuleNumber == 0 && index <= GetNModules() ) {
	330	EmcModuleCoverage(index, tm, tM, pm, pM) ;
88cb7938	331	if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
52a36ffd	332	ModuleNumber = index ;
52a36ffd	333	index++ ;
d15a28e7	334	}
52a36ffd	335	if ( ModuleNumber != 0 ) {
52a36ffd	336	Float_t phi0 = GetPHOSAngle(ModuleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
710f859a	337	Float_t y0 = GetIPtoCrystalSurface() ;
88cb7938	338	Double_t angle = phi - phi0;
52a36ffd	339	x = y0 * TMath::Tan(angle) ;
	340	angle = theta - TMath::Pi() / 2 ;
	341	z = y0 * TMath::Tan(angle) ;
d15a28e7	342	}
d15a28e7	343	}
d15a28e7	344
1c9d8212	345	Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const
1c9d8212	346	{
88cb7938	347	Bool_t In=kFALSE;
88cb7938	348	Int_t ModuleNumber=0;
1c9d8212	349	Double_t z,x;
88cb7938	350	ImpactOnEmc(particle->Theta(),particle->Phi(),ModuleNumber,z,x);
	351	if(ModuleNumber) In=kTRUE;
	352	else In=kFALSE;
	353	return In;
1c9d8212	354	}
1c9d8212	355
d15a28e7	356	//____________________________________________________________________________
7b7c1533	357	Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
d15a28e7	358	{
b2a60966	359	// Converts the relative numbering into the absolute numbering
ed4205d8	360	// EMCA crystals:
ed4205d8	361	// AbsId = from 1 to fNModules * fNPhi * fNZ
ed4205d8	362	// CPV pad:
	363	// AbsId = from N(total PHOS crystals) + 1
	364	// to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
d15a28e7	365
d15a28e7	366	Bool_t rv = kTRUE ;
710f859a	367
710f859a	368	if ( relid[1] == 0 ) { // it is a Phos crystal
52a36ffd	369	AbsId =
710f859a	370	( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
	371	+ ( relid[2] - 1 ) * GetNZ() // the offset along phi
	372	+ relid[3] ; // the offset along z
d15a28e7	373	}
710f859a	374	else { // it is a CPV pad
	375	AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
	376	+ ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
	377	+ ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
52a36ffd	378	+ relid[3] ; // the column number
	379	}
	380
d15a28e7	381	return rv ;
	382	}
	383
	384	//____________________________________________________________________________
	385
7b7c1533	386	void AliPHOSGeometry::RelPosInAlice(const Int_t id, TVector3 & pos ) const
d15a28e7	387	{
a4e98857	388	// Converts the absolute numbering into the global ALICE coordinate system
b2a60966	389
ed4205d8	390
	391	Int_t relid[4] ;
	392
	393	AbsToRelNumbering(id , relid) ;
	394
	395	Int_t phosmodule = relid[0] ;
	396
	397	Float_t y0 = 0 ;
	398
710f859a	399	if ( relid[1] == 0 ) // it is a PbW04 crystal
	400	y0 = - GetIPtoCrystalSurface() ;
	401	else
	402	y0 = - GetIPtoUpperCPVsurface() ;
	403
ed4205d8	404	Float_t x, z ;
	405	RelPosInModule(relid, x, z) ;
	406
	407	pos.SetX(x) ;
	408	pos.SetZ(z) ;
710f859a	409	pos.SetY(y0) ;
ed4205d8	410
ed4205d8	411	Float_t phi = GetPHOSAngle( phosmodule) ;
a8c47ab6	412	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
ed4205d8	413	Float_t rphi = phi / kRADDEG ;
	414
	415	TRotation rot ;
	416	rot.RotateZ(-rphi) ; // a rotation around Z by angle
	417
	418	TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
	419
	420	pos.Transform(rot) ; // rotate the baby
d15a28e7	421	}
	422
	423	//____________________________________________________________________________
7b7c1533	424	void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
d15a28e7	425	{
b2a60966	426	// Converts the relative numbering into the local PHOS-module (x, z) coordinates
52a36ffd	427	// Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
b2a60966	428
786222b3	429	Int_t row = relid[2] ; //offset along x axis
786222b3	430	Int_t column = relid[3] ; //offset along z axis
d15a28e7	431
ed4205d8	432
66c3e8ff	433	if ( relid[1] == 0 ) { // its a PbW04 crystal
	434	x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect
	435	z = ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module
52a36ffd	436	}
52a36ffd	437	else {
710f859a	438	x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
710f859a	439	z = ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module
52a36ffd	440	}
2f3366b6	441	}