/**************************************************************************
* 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)
// --- ROOT system ---
#include "TVector3.h"
#include "TRotation.h"
// --- Standard library ---
#include <iostream.h>
// --- AliRoot header files ---
#include "AliPHOSGeometry.h"
#include "AliPHOSEMCAGeometry.h"
#include "AliPHOSPpsdRecPoint.h"
#include "AliConst.h"
ClassImp(AliPHOSGeometry) ;
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
if ( ((strcmp( fName, "default" )) == 0) ||
((strcmp( fName, "GPS2" )) == 0) ||
((strcmp( fName, "IHEP" )) == 0) ||
((strcmp( fName, "MIXT" )) == 0) ) {
fgInit = kTRUE ;
fNModules = 5;
fNPPSDModules = 0;
fAngle = 20;
fGeometryEMCA = new AliPHOSEMCAGeometry();
if ( ((strcmp( fName, "GPS2" )) == 0) ) {
fGeometryPPSD = new AliPHOSPPSDGeometry();
fGeometryCPV = 0;
fNPPSDModules = fNModules;
}
else if ( ((strcmp( fName, "IHEP" )) == 0) ) {
fGeometryCPV = new AliPHOSCPVGeometry ();
fGeometryPPSD = 0;
fNPPSDModules = 0;
}
else if ( ((strcmp( fName, "MIXT" )) == 0) ) {
fGeometryCPV = new AliPHOSCPVGeometry ();
fGeometryPPSD = new AliPHOSPPSDGeometry();
fNPPSDModules = 1;
}
fGeometrySUPP = new AliPHOSSupportGeometry();
fPHOSAngle = new Float_t[fNModules] ;
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) ;
}
else {
fgInit = kFALSE ;
cout << "PHOS Geometry setup: option not defined " << fName << endl ;
}
}
//____________________________________________________________________________
Float_t AliPHOSGeometry::GetCPVBoxSize(Int_t index) const {
if (strcmp(fName,"GPS2") ==0 )
return fGeometryPPSD->GetCPVBoxSize(index);
else if (strcmp(fName,"IHEP")==0)
return fGeometryCPV ->GetCPVBoxSize(index);
else if (strcmp(fName,"MIXT")==0)
return TMath::Max(fGeometryCPV ->GetCPVBoxSize(index), fGeometryPPSD->GetCPVBoxSize(index));
else
return 0;
}
//____________________________________________________________________________
AliPHOSGeometry * AliPHOSGeometry::GetInstance()
{
// Returns the pointer of the unique instance
return (AliPHOSGeometry *) fgGeom ;
}
//____________________________________________________________________________
AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
{
// Returns the pointer of the unique instance
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 ) {
cout << "AliPHOSGeometry <E> : current geometry is " << fgGeom->GetName() << endl
<< " you cannot call " << name << endl ;
}
else
rv = (AliPHOSGeometry *) fgGeom ;
}
return rv ;
}
//____________________________________________________________________________
void AliPHOSGeometry::SetPHOSAngles()
{
// Calculates the position in ALICE of the PHOS modules
Double_t const kRADDEG = 180.0 / kPI ;
Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoOuterCoverDistance() ) ) ;
pphi *= kRADDEG ;
if (pphi > fAngle) cout << "AliPHOSGeometry: PHOS modules overlap!n";
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)
{
// Converts the absolute numbering into the following array/
// relid[0] = PHOS Module number 1:fNModules
// relid[1] = 0 if PbW04
// = PPSD Module number 1:fNumberOfModulesPhi*fNumberOfModulesZ*2 (2->up and bottom level)
// relid[2] = Row number inside a PHOS or PPSD module
// relid[3] = Column number inside a PHOS or PPSD module
Bool_t rv = kTRUE ;
Float_t id = AbsId ;
Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / ( GetNPhi() * GetNZ() ) ) ;
if ( phosmodulenumber > GetNModules() ) { // it is a PPSD or CPV pad
if ( strcmp(fName,"GPS2") == 0 ) {
id -= GetNPhi() * GetNZ() * GetNModules() ;
Float_t tempo = 2 * GetNumberOfModulesPhi() * GetNumberOfModulesZ() * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
relid[0] = (Int_t)TMath::Ceil( id / tempo ) ;
id -= ( relid[0] - 1 ) * tempo ;
relid[1] = (Int_t)TMath::Ceil( id / ( GetNumberOfPadsPhi() * GetNumberOfPadsZ() ) ) ;
id -= ( relid[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
relid[2] = (Int_t)TMath::Ceil( id / GetNumberOfPadsPhi() ) ;
relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfPadsPhi() ) ;
}
else if ( strcmp(fName,"IHEP") == 0 ) {
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 if ( strcmp(fName,"MIXT") == 0 ) {
id -= GetNPhi() * GetNZ() * GetNModules() ;
Float_t nPPSD = 2 * GetNumberOfModulesPhi() * GetNumberOfModulesZ() * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
if (id <= nCPV*GetNCPVModules()) { // this pad belons to CPV
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 { // this pad belons to PPSD
id -= nCPV*GetNCPVModules();
relid[0] = (Int_t)TMath::Ceil( id / nPPSD );
id -= ( relid[0] - 1 ) * nPPSD ;
relid[0] += GetNCPVModules();
relid[1] = (Int_t)TMath::Ceil( id / ( GetNumberOfPadsPhi() * GetNumberOfPadsZ() ) ) ;
id -= ( relid[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
relid[2] = (Int_t)TMath::Ceil( id / GetNumberOfPadsPhi() ) ;
relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfPadsPhi() ) ;
}
}
}
else { // its a PW04 crystal
relid[0] = phosmodulenumber ;
relid[1] = 0 ;
id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
relid[2] = (Int_t)TMath::Ceil( id / GetNPhi() ) ;
relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNPhi() ) ;
}
return rv ;
}
//____________________________________________________________________________
void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt)
{
// calculates the angular coverage in theta and phi of a EMC module
Double_t conv ;
if ( opt == Radian() )
conv = 1. ;
else if ( opt == Degre() )
conv = 180. / TMath::Pi() ;
else {
cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
conv = 1. ;
}
Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
Float_t y0 = GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness() ;
Double_t angle = TMath::ATan( GetCrystalSize(0)*GetNPhi() / (2 * y0) ) ;
phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 230 and 310 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( GetCrystalSize(2)*GetNZ() / (2 * 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)
{
// calculates the angular coverage in theta and phi of a single crystal in a EMC module
Double_t conv ;
if ( opt == Radian() )
conv = 1. ;
else if ( opt == Degre() )
conv = 180. / TMath::Pi() ;
else {
cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
conv = 1. ;
}
Float_t y0 = GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness() ;
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 ALICE global coordinates of a RecPoint and the error matrix
AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
TVector3 localposition ;
tmpPHOS->GetLocalPosition(gpos) ;
if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
{ gpos.SetY( -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness() +
GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ) ;
}
else
{ // it is a PPSD pad
AliPHOSPpsdRecPoint * tmpPpsd = (AliPHOSPpsdRecPoint *) RecPoint ;
if (tmpPpsd->GetUp() ) // it is an upper module
{
gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() -
GetLeadToMicro2Gap() - GetLeadConverterThickness() -
GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0 ) ) ;
}
else // it is a lower module
gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ) ;
}
Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
Double_t const kRADDEG = 180.0 / kPI ;
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::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
{
// Calculates the ALICE global coordinates of a RecPoint
AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
TVector3 localposition ;
tmpPHOS->GetLocalPosition(gpos) ;
if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
{ gpos.SetY( -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness() +
GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ) ;
}
else
{ // it is a PPSD pad
AliPHOSPpsdRecPoint * tmpPpsd = (AliPHOSPpsdRecPoint *) RecPoint ;
if (tmpPpsd->GetUp() ) // it is an upper module
{
gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() -
GetLeadToMicro2Gap() - GetLeadConverterThickness() -
GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0 ) ) ;
}
else // it is a lower module
gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ) ;
}
Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
Double_t const kRADDEG = 180.0 / kPI ;
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)
{
// calculates the impact coordinates of a neutral particle
// emitted in direction theta and phi in ALICE
// 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 = GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness() ;
Double_t angle = phi - phi0;
x = y0 * TMath::Tan(angle) ;
angle = theta - TMath::Pi() / 2 ;
z = y0 * TMath::Tan(angle) ;
}
}
//____________________________________________________________________________
Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId)
{
// Converts the relative numbering into the absolute numbering
// EMCA crystals:
// AbsId = from 1 to fNModules * fNPhi * fNZ
// PPSD gas cell:
// AbsId = from N(total EMCA crystals) + 1
// to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ +
// fNModules * 2 * (fNumberOfModulesPhi * fNumberOfModulesZ) * fNumberOfPadsPhi * fNumberOfPadsZ
// CPV pad:
// AbsId = from N(total PHOS crystals) + 1
// to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
Bool_t rv = kTRUE ;
if ( relid[1] > 0 && strcmp(fName,"GPS2")==0) { // it is a PPSD pad
AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from PPSD pads
+ ( relid[0] - 1 ) * GetNumberOfModulesPhi() * GetNumberOfModulesZ() // the pads offset of PPSD modules
* GetNumberOfPadsPhi() * GetNumberOfPadsZ() * 2
+ ( relid[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() // the pads offset of PPSD modules
+ ( relid[2] - 1 ) * GetNumberOfPadsPhi() // the pads offset of a PPSD row
+ relid[3] ; // the column number
}
else if ( relid[1] > 0 && strcmp(fName,"MIXT")==0) { // it is a PPSD pad
AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from PPSD pads
+ GetNCPVModules() * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of CPV modules if any
+ ( relid[0] - 1 - GetNCPVModules())
* GetNumberOfModulesPhi() * GetNumberOfModulesZ() // the pads offset of PPSD modules
* GetNumberOfPadsPhi() * GetNumberOfPadsZ() * 2
+ ( relid[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() // the pads offset of PPSD modules
+ ( relid[2] - 1 ) * GetNumberOfPadsPhi() // the pads offset of a PPSD row
+ relid[3] ; // the column number
}
else if ( relid[1] == 0 ) { // it is a Phos crystal
AbsId =
( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
+ ( relid[2] - 1 ) * GetNPhi() // the offset of a xtal row
+ relid[3] ; // the column number
}
else if ( relid[1] == -1 ) { // 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 )
{
// Converts the absolute numbering into the global ALICE coordinates
// It works only for the GPS2 geometry
if (id > 0 && strcmp(fName,"GPS2")==0) {
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 = -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ;
}
if ( relid[1] > 0 ) { // its a PPSD pad
if ( relid[1] > GetNumberOfModulesPhi() * GetNumberOfModulesZ() ) { // its an bottom module
y0 = -( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ;
}
else // its an upper module
y0 = -( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() - GetLeadToMicro2Gap()
- GetLeadConverterThickness() - GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0) ;
}
Float_t x, z ;
RelPosInModule(relid, x, z) ;
pos.SetX(x) ;
pos.SetZ(z) ;
pos.SetY( TMath::Sqrt(x*x + z*z + y0*y0) ) ;
Float_t phi = GetPHOSAngle( phosmodule) ;
Double_t const kRADDEG = 180.0 / kPI ;
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
}
else {
pos.SetX(0.);
pos.SetY(0.);
pos.SetZ(0.);
}
}
//____________________________________________________________________________
void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z)
{
// 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)
Bool_t padOfCPV = (strcmp(fName,"IHEP")==0) ||
((strcmp(fName,"MIXT")==0) && relid[0]<=GetNCPVModules()) ;
Bool_t padOfPPSD = (strcmp(fName,"GPS2")==0) ||
((strcmp(fName,"MIXT")==0) && relid[0]> GetNCPVModules()) ;
Int_t ppsdmodule ;
Float_t x0,z0;
Int_t row = relid[2] ; //offset along x axiz
Int_t column = relid[3] ; //offset along z axiz
Float_t padsizeZ = 0;
Float_t padsizeX = 0;
Int_t nOfPadsPhi = 0;
Int_t nOfPadsZ = 0;
if ( padOfPPSD ) {
padsizeZ = GetPPSDModuleSize(2) / GetNumberOfPadsZ();
padsizeX = GetPPSDModuleSize(0) / GetNumberOfPadsPhi();
nOfPadsPhi = GetNumberOfPadsPhi();
nOfPadsZ = GetNumberOfPadsZ();
}
else if ( padOfCPV ) {
padsizeZ = GetPadSizeZ();
padsizeX = GetPadSizePhi();
nOfPadsPhi = GetNumberOfCPVPadsPhi();
nOfPadsZ = GetNumberOfCPVPadsZ();
}
if ( relid[1] == 0 ) { // its a PbW04 crystal
x = - ( GetNPhi()/2. - row + 0.5 ) * GetCrystalSize(0) ; // position ox Xtal with respect
z = ( GetNZ() /2. - column + 0.5 ) * GetCrystalSize(2) ; // of center of PHOS module
}
else {
if ( padOfPPSD ) {
if ( relid[1] > GetNumberOfModulesPhi() * GetNumberOfModulesZ() )
ppsdmodule = relid[1]-GetNumberOfModulesPhi() * GetNumberOfModulesZ();
else
ppsdmodule = relid[1] ;
Int_t modrow = 1+(Int_t)TMath::Ceil( (Float_t)ppsdmodule / GetNumberOfModulesPhi()-1. ) ;
Int_t modcol = ppsdmodule - ( modrow - 1 ) * GetNumberOfModulesPhi() ;
x0 = ( GetNumberOfModulesPhi() / 2. - modrow + 0.5 ) * GetPPSDModuleSize(0) ;
z0 = ( GetNumberOfModulesZ() / 2. - modcol + 0.5 ) * GetPPSDModuleSize(2) ;
} else {
x0 = 0;
z0 = 0;
}
x = - ( nOfPadsPhi/2. - row - 0.5 ) * padsizeX + x0 ; // position of pad with respect
z = ( nOfPadsZ /2. - column - 0.5 ) * padsizeZ - z0 ; // of center of PHOS module
}
}
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