[u/mrichter/AliRoot.git] / EMCAL / AliEMCALGeometry.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 EMCAL : singleton  
// EMCAL consists of layers of scintillator and lead
// Places the the Barrel Geometry of The EMCAL at Midrapidity
// between 0 and 120 degrees of Phi and
// -0.7 to 0.7 in eta 
// Number of Modules and Layers may be controlled by 
// the name of the instance defined               
// EMCALArch2x has more modules along both phi and eta
// EMCALArchxa has less Layers in the Radial Direction
//*-- Author: Sahal Yacoob (LBL / UCT)
//     and  : Yves Schutz (SUBATECH)
//     and  : Jennifer Klay (LBL)

// --- ROOT system ---

// --- Standard library ---

#include <iostream.h>

// --- AliRoot header files ---
#include <TMath.h>
// -- ALICE Headers.
#include "AliConst.h"
// --- EMCAL headers
#include "AliEMCALGeometry.h"

ClassImp(AliEMCALGeometry);

AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
Bool_t            AliEMCALGeometry::fgInit = kFALSE;

//______________________________________________________________________
AliEMCALGeometry::~AliEMCALGeometry(void){
    // dtor
}
//______________________________________________________________________
void AliEMCALGeometry::Init(void){
    // Initializes the EMCAL parameters

    fgInit = kFALSE; // Assume failer untill proven otherwise.
    if(!(  (strcmp( fName, "EMCALArch1a" ) == 0) |
	   (strcmp( fName, "EMCALArch1b" ) == 0) | 
	   (strcmp( fName, "EMCALArch2a" ) == 0) | 
	   (strcmp( fName, "EMCALArch2b" ) == 0) )){
	cout <<"Instance " << fName << " undefined" << endl;
    } // end if
    //
    if (((strcmp( fName, "EMCALArch1a" ))    == 0) |
	((strcmp( fName, "EMCALArch1b" ))    == 0)){
	fNZ         = 96;
	fNPhi       = 144;
    } // end if
    if (((strcmp( fName, "EMCALArch2a" ))    == 0) |
	((strcmp( fName, "EMCALArch2b" ))    == 0)){
	fNZ         = 112;
	fNPhi       = 168;
    } // end if
    if (((strcmp( fName, "EMCALArch1a" ))    == 0) |
	((strcmp( fName, "EMCALArch2a" ))    == 0)){
	fNLayers    = 21;
    } // end if
    if (((strcmp( fName, "EMCALArch1b" ))    == 0) |
	((strcmp( fName, "EMCALArch2b" ))    == 0)){
	fNLayers    = 25;
    } // end if

    // geometry
    fAirGap         = 5.0; // cm, air gap between EMCAL mother volume and 
                           // active material.
    fAlFrontThick   = 3.18; // cm, Thickness of front Al layer
    fPbRadThickness = 0.5; // cm, Thickness of theh Pb radiators.
    fPreShowerSintThick = 0.6; // cm, Thickness of the sintilator for the
                               // preshower part of the calorimeter
    fFullShowerSintThick = 0.5; // cm, Thickness of the sintilator for the
                                // full shower part of the calorimeter
    fArm1PhiMin     =  60.0; // degrees, Starting EMCAL Phi position
    fArm1PhiMax     = 180.0; // degrees, Ending EMCAL Phi position
    fArm1EtaMin     = -0.7; // pseudorapidity, Starting EMCAL Eta position
    fArm1EtaMax     = +0.7; // pseudorapidity, Ending EMCAL Eta position
    fIPDistance     = 454.0; // cm, Radial distance to inner surface of EMCAL
    fShellThickness = GetAlFrontThickness() + 2.*GetPreSintThick() +
	(fNLayers-2)*GetFullSintThick()+(fNLayers-1)*GetPbRadThick();
    //below; cm, Z lenght of the EMCAL.
    fZLength        = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax);
    fEnvelop[0]     = fIPDistance; // mother volume inner radius
    fEnvelop[1]     = fIPDistance + fShellThickness; // mother volume outer r.
    fEnvelop[2]     = 1.00001*fZLength; // add some padding for mother volume. 
    fGap2Active     = 1.0;  // cm, Gap between 
    fgInit = kTRUE; 
}
//______________________________________________________________________
AliEMCALGeometry *  AliEMCALGeometry::GetInstance(){ 
    // Returns the pointer of the unique instance

    return (AliEMCALGeometry *) fgGeom; 
}
//______________________________________________________________________
AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
						const Text_t* title){
    // Returns the pointer of the unique instance

    AliEMCALGeometry * rv = 0; 
    if ( fgGeom == 0 ) {
	if ( strcmp(name,"") == 0 ) rv = 0;
	else {    
	    fgGeom = new AliEMCALGeometry(name, title);
	    if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
	    else {
		rv = 0; 
		delete fgGeom; 
		fgGeom = 0; 
	    } // end if fgInit
	} // end if strcmp(name,"")
    }else{
	if ( strcmp(fgGeom->GetName(), name) != 0 ) {
	    cout << "AliEMCALGeometry <E> : current geometry is " 
		 << fgGeom->GetName() << endl
		 << "                      you cannot call     " << name 
		 << endl; 
	}else{
	    rv = (AliEMCALGeometry *) fgGeom; 
	} // end if
    }  // end if fgGeom
    return rv; 
}
//______________________________________________________________________
Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi,Int_t ipre) const {
    // Returns the tower index number from the based on the Z and Phi
    // index numbers. There are 2 times the number of towers to separate
    // out the full towsers from the pre-towsers.
    // Inputs:
    //   Int_t ieta    // index allong z axis [1-fNZ]
    //   Int_t iphi  // index allong phi axis [1-fNPhi]
    //   Int_t ipre  // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
    // Outputs:
    //   none.
    // Returned
    // Int_t the absoulute tower index. [1-2*fNZ*fNPhi]
    Int_t index;

    if((ieta<=0 || ieta>GetNEta()) || (iphi<=0 || iphi>GetNPhi()) ||
       (ipre<0 || ipre>1) ){
	cout << "inputs out of range ieta=" << ieta << " [1-" << GetNEta();
	cout << "] iphi=" << iphi << " [1-" << GetNPhi() << "] ipre=";
	cout << ipre << "[0,1]. returning -1" << endl;
	return -1;
    } // end if
    index = iphi + GetNPhi()*(ieta-1) + ipre*(GetNPhi()*GetNEta());
    return index;
}
//______________________________________________________________________
void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
				    Int_t &ipre) const {
    // given the tower index number it returns the based on the Z and Phi
    // index numbers and if it is for the full tower or the pre-tower number.
    // There are 2 times the number of towers to separate
    // out the full towsers from the pre-towsers.
    // Inputs:
    //   Int_t index // Tower index number [1-2*fNZ*fNPhi]
    // Outputs:
    //   Int_t ieta    // index allong z axis [1-fNZ]
    //   Int_t iphi  // index allong phi axis [1-fNPhi]
    //   Int_t ipre  // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
    // Returned
    //   none.
    Int_t itowers;

    itowers = GetNEta()*GetNPhi();
    if(index<1 || index>2*itowers){
	cout << "index=" << index <<" is out of range [1-";
	cout << 2*itowers << "], returning -1 for all." << endl;
	ieta = -1; iphi = -1; ipre = -1;
	return ;
    } // end if
    ipre = 0;
    if(index>itowers){ // pre shower indexs
	ipre = 1;
	index = index - itowers;
    } // end if
    ieta = 1+ (Int_t)((index-1)/GetNPhi());
    iphi = index - GetNPhi()*(ieta-1);
    return;
}
//______________________________________________________________________
void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
    // given the tower index number it returns the based on the eta and phi
    // of the tower.
    // Inputs:
    //   Int_t index // Tower index number [1-2*fNZ*fNPhi]
    // Outputs:
    //   Float_t eta  // eta of center of tower in pseudorapidity
    //   Float_t phi  // phi of center of tower in degrees
    // Returned
    //   none.
    Int_t ieta,iphi,ipre;
    Double_t deta,dphi,phid;

    TowerIndexes(index,ieta,iphi,ipre);
    deta = (GetArm1EtaMax()-GetArm1EtaMin())/((Float_t)GetNEta());
    eta  = GetArm1EtaMin() + (((Float_t)ieta)-0.5)*deta;
    dphi = (GetArm1PhiMax() - GetArm1PhiMin())/((Float_t)GetNPhi());  // in degrees.
    phid = GetArm1PhiMin() + dphi*((Float_t)iphi -0.5);//iphi range [1-fNphi].
    phi  = phid;
}
//______________________________________________________________________
Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
    // returns the tower index number based on the eta and phi of the tower.
    // Inputs:
    //   Float_t eta  // eta of center of tower in pseudorapidity
    //   Float_t phi  // phi of center of tower in degrees
    // Outputs:
    //   none.
    // Returned
    //   Int_t index // Tower index number [1-fNZ*fNPhi]
    Int_t ieta,iphi;

    ieta = 1 + (Int_t)(((Float_t)GetNEta())*(eta-GetArm1EtaMin())/
		  (GetArm1EtaMax() - GetArm1EtaMin()));
    if(ieta<=0 || ieta>GetNEta()){
	cout << "TowerIndexFromEtaPhi:";
	cout << "ieta = "<< ieta << " eta=" << eta << " is outside of EMCAL. etamin=";
	cout << GetArm1EtaMin() << " to etamax=" << GetArm1EtaMax();
	cout << " returning -1" << endl;
	return -1;
    } // end if
    iphi = 1 + (Int_t)(((Float_t)GetNPhi())*(phi-GetArm1PhiMin())/
		  ((Float_t)(GetArm1PhiMax() - GetArm1PhiMin())));
    if(iphi<=0 || iphi>GetNPhi()){
	cout << "TowerIndexFromEtaPhi:";
	cout << "iphi=" << iphi << " phi=" << phi << " is outside of EMCAL.";
	cout << " Phimin=" << GetArm1PhiMin() << " PhiMax=" << GetArm1PhiMax();
	cout << " returning -1" << endl;
	return -1;
    } // end if
    return TowerIndex(ieta,iphi,0);
}
//______________________________________________________________________
Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
    // returns the pretower index number based on the eta and phi of the tower.
    // Inputs:
    //   Float_t eta  // eta of center of tower in pseudorapidity
    //   Float_t phi  // phi of center of tower in degrees
    // Outputs:
    //   none.
    // Returned
    //   Int_t index // PreTower index number [fNZ*fNPhi-2*fNZ*fNPhi]

    return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
}
//______________________________________________________________________
Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
    // Converts the absolute numbering into the following array/
    //  relid[0] = EMCAL Arm number 1:1 
    //  relid[1] = 0  Not in Pre Shower layers
    //           = -1 In Pre Shower
    //  relid[2] = Row number inside EMCAL
    //  relid[3] = Column number inside EMCAL
    // Input:
    //   Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
    // Outputs:
    //   Int_t *relid // array of 5. Discribed above.
    Bool_t rv  = kTRUE ;
    Int_t ieta=0,iphi=0,ipre=0,index=AbsId;

    TowerIndexes(index,ieta,iphi,ipre);
    relid[0] = 1;
    relid[1] = 0;
    if(ipre==1) 
      relid[1] = -1;
    relid[2] = ieta;
    relid[3] = iphi;

    return rv;
}
//______________________________________________________________________
void AliEMCALGeometry::PosInAlice(const Int_t *relid,Float_t &theta,
				     Float_t &phi) const {
    // Converts the relative numbering into the local EMCAL-module (x, z)
    // coordinates
    Int_t ieta   = relid[2]; // offset along x axis
    Int_t iphi = relid[3]; // offset along z axis
    Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
    Int_t index;
    Float_t eta;

    if(ipre==-1) ipre = 1;
    index = TowerIndex(ieta,iphi,ipre);
    EtaPhiFromIndex(index,eta,phi);
    theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();

    return;
}

//______________________________________________________________________
void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
    // given the tower relative number it returns the X, Y and Z
    // of the tower.
    
    // Outputs:
    //   Float_t x  // x of center of tower in cm
    //   Float_t y  // y of center of tower in cm
    //   Float_t z  // z of centre of tower in cm
    // Returned
    //   none.
    
    Float_t eta,theta, phi,cyl_radius,kDeg2Rad;
    
    Int_t ieta   = relid[2]; // offset along x axis
    Int_t iphi = relid[3]; // offset along z axis
    Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
    Int_t index;
    

    if(ipre==-1) ipre = 1;
    index = TowerIndex(ieta,iphi,ipre);
    EtaPhiFromIndex(index,eta,phi);
    theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();

 
    
    kDeg2Rad = TMath::Pi() / static_cast<Double_t>(180) ; 
    cyl_radius = GetIPDistance()+ GetAirGap() ;
    x =  cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
    y =  cyl_radius * TMath::Cos(phi * kDeg2Rad ) ; 
    z =  cyl_radius / TMath::Tan(theta * kDeg2Rad ) ; 
 
 return;
} 

//______________________________________________________________________
/*
Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
    // Returns kTRUE if the two towers are neighbours or not, including
    // diagonals. Both indexes are required to be either towers or preshower.
    // Inputs:
    //   Int_t index1  // index of tower 1
    //   Int_t index2  // index of tower 2
    // Outputs:
    //   none.
    // Returned
    //   Boot_t kTRUE if the towers are neighbours otherwise false.
    Boot_t anb = kFALSE;
    Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0, ipre1 = 0, ipre2 = 0;

    TowerIndexes(index1,ieta1,iphi1,ipre1);
    TowerIndexes(index2,ieta2,iphi2,ipre2);
    if(ipre1!=ipre2) return anb;
    if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))
                                                                 anb = kTRUE;
    return anb;
}
 */
Commit	Line	Data
2012850d	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
	16	/* $Id$*/
	17
	18	//_________________________________________________________________________
	19	// Geometry class for EMCAL : singleton
b13bbe81	20	// EMCAL consists of layers of scintillator and lead
ffa6d63b	21	// Places the the Barrel Geometry of The EMCAL at Midrapidity
	22	// between 0 and 120 degrees of Phi and
	23	// -0.7 to 0.7 in eta
	24	// Number of Modules and Layers may be controlled by
	25	// the name of the instance defined
	26	// EMCALArch2x has more modules along both phi and eta
	27	// EMCALArchxa has less Layers in the Radial Direction
b13bbe81	28	//*-- Author: Sahal Yacoob (LBL / UCT)
	29	// and : Yves Schutz (SUBATECH)
	30	// and : Jennifer Klay (LBL)
2012850d	31
	32	// --- ROOT system ---
	33
	34	// --- Standard library ---
	35
	36	#include <iostream.h>
	37
	38	// --- AliRoot header files ---
ca8f5bd0	39	#include <TMath.h>
ca8f5bd0	40	// -- ALICE Headers.
2012850d	41	#include "AliConst.h"
ca8f5bd0	42	// --- EMCAL headers
ca8f5bd0	43	#include "AliEMCALGeometry.h"
2012850d	44
b13bbe81	45	ClassImp(AliEMCALGeometry);
2012850d	46
b13bbe81	47	AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
b13bbe81	48	Bool_t AliEMCALGeometry::fgInit = kFALSE;
2012850d	49
b13bbe81	50	//______________________________________________________________________
	51	AliEMCALGeometry::~AliEMCALGeometry(void){
	52	// dtor
2012850d	53	}
b13bbe81	54	//______________________________________________________________________
	55	void AliEMCALGeometry::Init(void){
	56	// Initializes the EMCAL parameters
	57
e908f07f	58	fgInit = kFALSE; // Assume failer untill proven otherwise.
b13bbe81	59	if(!( (strcmp( fName, "EMCALArch1a" ) == 0) \|
	60	(strcmp( fName, "EMCALArch1b" ) == 0) \|
	61	(strcmp( fName, "EMCALArch2a" ) == 0) \|
	62	(strcmp( fName, "EMCALArch2b" ) == 0) )){
b13bbe81	63	cout <<"Instance " << fName << " undefined" << endl;
b13bbe81	64	} // end if
e908f07f	65	//
b13bbe81	66	if (((strcmp( fName, "EMCALArch1a" )) == 0) \|
	67	((strcmp( fName, "EMCALArch1b" )) == 0)){
	68	fNZ = 96;
	69	fNPhi = 144;
	70	} // end if
	71	if (((strcmp( fName, "EMCALArch2a" )) == 0) \|
	72	((strcmp( fName, "EMCALArch2b" )) == 0)){
	73	fNZ = 112;
	74	fNPhi = 168;
	75	} // end if
	76	if (((strcmp( fName, "EMCALArch1a" )) == 0) \|
	77	((strcmp( fName, "EMCALArch2a" )) == 0)){
	78	fNLayers = 21;
	79	} // end if
	80	if (((strcmp( fName, "EMCALArch1b" )) == 0) \|
	81	((strcmp( fName, "EMCALArch2b" )) == 0)){
	82	fNLayers = 25;
	83	} // end if
e908f07f	84
	85	// geometry
	86	fAirGap = 5.0; // cm, air gap between EMCAL mother volume and
	87	// active material.
	88	fAlFrontThick = 3.18; // cm, Thickness of front Al layer
	89	fPbRadThickness = 0.5; // cm, Thickness of theh Pb radiators.
	90	fPreShowerSintThick = 0.6; // cm, Thickness of the sintilator for the
	91	// preshower part of the calorimeter
	92	fFullShowerSintThick = 0.5; // cm, Thickness of the sintilator for the
	93	// full shower part of the calorimeter
6365f121	94	fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
6365f121	95	fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
e908f07f	96	fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
	97	fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
	98	fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
	99	fShellThickness = GetAlFrontThickness() + 2.*GetPreSintThick() +
	100	(fNLayers-2)GetFullSintThick()+(fNLayers-1)GetPbRadThick();
	101	//below; cm, Z lenght of the EMCAL.
	102	fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax);
	103	fEnvelop[0] = fIPDistance; // mother volume inner radius
	104	fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
	105	fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
	106	fGap2Active = 1.0; // cm, Gap between
	107	fgInit = kTRUE;
2012850d	108	}
b13bbe81	109	//______________________________________________________________________
	110	AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
	111	// Returns the pointer of the unique instance
2012850d	112
b13bbe81	113	return (AliEMCALGeometry *) fgGeom;
2012850d	114	}
b13bbe81	115	//______________________________________________________________________
	116	AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
	117	const Text_t* title){
	118	// Returns the pointer of the unique instance
	119
	120	AliEMCALGeometry * rv = 0;
	121	if ( fgGeom == 0 ) {
	122	if ( strcmp(name,"") == 0 ) rv = 0;
	123	else {
	124	fgGeom = new AliEMCALGeometry(name, title);
	125	if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
	126	else {
	127	rv = 0;
	128	delete fgGeom;
	129	fgGeom = 0;
	130	} // end if fgInit
	131	} // end if strcmp(name,"")
	132	}else{
	133	if ( strcmp(fgGeom->GetName(), name) != 0 ) {
	134	cout << "AliEMCALGeometry <E> : current geometry is "
	135	<< fgGeom->GetName() << endl
	136	<< " you cannot call " << name
	137	<< endl;
	138	}else{
	139	rv = (AliEMCALGeometry *) fgGeom;
	140	} // end if
	141	} // end if fgGeom
	142	return rv;
2012850d	143	}
ca8f5bd0	144	//______________________________________________________________________
a34b7b9f	145	Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi,Int_t ipre) const {
ca8f5bd0	146	// Returns the tower index number from the based on the Z and Phi
	147	// index numbers. There are 2 times the number of towers to separate
	148	// out the full towsers from the pre-towsers.
	149	// Inputs:
e908f07f	150	// Int_t ieta // index allong z axis [1-fNZ]
ca8f5bd0	151	// Int_t iphi // index allong phi axis [1-fNPhi]
	152	// Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
	153	// Outputs:
	154	// none.
	155	// Returned
	156	// Int_t the absoulute tower index. [1-2fNZfNPhi]
	157	Int_t index;
	158
e908f07f	159	if((ieta<=0 \|\| ieta>GetNEta()) \|\| (iphi<=0 \|\| iphi>GetNPhi()) \|\|
ca8f5bd0	160	(ipre<0 \|\| ipre>1) ){
e908f07f	161	cout << "inputs out of range ieta=" << ieta << " [1-" << GetNEta();
e908f07f	162	cout << "] iphi=" << iphi << " [1-" << GetNPhi() << "] ipre=";
ca8f5bd0	163	cout << ipre << "[0,1]. returning -1" << endl;
	164	return -1;
	165	} // end if
e908f07f	166	index = iphi + GetNPhi()(ieta-1) + ipre(GetNPhi()*GetNEta());
ca8f5bd0	167	return index;
	168	}
	169	//______________________________________________________________________
e908f07f	170	void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
a34b7b9f	171	Int_t &ipre) const {
ca8f5bd0	172	// given the tower index number it returns the based on the Z and Phi
	173	// index numbers and if it is for the full tower or the pre-tower number.
	174	// There are 2 times the number of towers to separate
	175	// out the full towsers from the pre-towsers.
	176	// Inputs:
	177	// Int_t index // Tower index number [1-2fNZfNPhi]
	178	// Outputs:
e908f07f	179	// Int_t ieta // index allong z axis [1-fNZ]
ca8f5bd0	180	// Int_t iphi // index allong phi axis [1-fNPhi]
	181	// Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
	182	// Returned
	183	// none.
	184	Int_t itowers;
	185
e908f07f	186	itowers = GetNEta()*GetNPhi();
ca8f5bd0	187	if(index<1 \|\| index>2*itowers){
	188	cout << "index=" << index <<" is out of range [1-";
	189	cout << 2*itowers << "], returning -1 for all." << endl;
e908f07f	190	ieta = -1; iphi = -1; ipre = -1;
ca8f5bd0	191	return ;
	192	} // end if
	193	ipre = 0;
	194	if(index>itowers){ // pre shower indexs
	195	ipre = 1;
	196	index = index - itowers;
	197	} // end if
4b988fd2	198	ieta = 1+ (Int_t)((index-1)/GetNPhi());
4b988fd2	199	iphi = index - GetNPhi()*(ieta-1);
ca8f5bd0	200	return;
	201	}
	202	//______________________________________________________________________
a34b7b9f	203	void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
ca8f5bd0	204	// given the tower index number it returns the based on the eta and phi
	205	// of the tower.
	206	// Inputs:
	207	// Int_t index // Tower index number [1-2fNZfNPhi]
	208	// Outputs:
	209	// Float_t eta // eta of center of tower in pseudorapidity
	210	// Float_t phi // phi of center of tower in degrees
	211	// Returned
	212	// none.
e908f07f	213	Int_t ieta,iphi,ipre;
e908f07f	214	Double_t deta,dphi,phid;
ca8f5bd0	215
e908f07f	216	TowerIndexes(index,ieta,iphi,ipre);
	217	deta = (GetArm1EtaMax()-GetArm1EtaMin())/((Float_t)GetNEta());
	218	eta = GetArm1EtaMin() + (((Float_t)ieta)-0.5)*deta;
	219	dphi = (GetArm1PhiMax() - GetArm1PhiMin())/((Float_t)GetNPhi()); // in degrees.
	220	phid = GetArm1PhiMin() + dphi*((Float_t)iphi -0.5);//iphi range [1-fNphi].
ca8f5bd0	221	phi = phid;
	222	}
	223	//______________________________________________________________________
a34b7b9f	224	Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0	225	// returns the tower index number based on the eta and phi of the tower.
	226	// Inputs:
	227	// Float_t eta // eta of center of tower in pseudorapidity
	228	// Float_t phi // phi of center of tower in degrees
	229	// Outputs:
	230	// none.
	231	// Returned
	232	// Int_t index // Tower index number [1-fNZ*fNPhi]
e908f07f	233	Int_t ieta,iphi;
ca8f5bd0	234
e908f07f	235	ieta = 1 + (Int_t)(((Float_t)GetNEta())*(eta-GetArm1EtaMin())/
	236	(GetArm1EtaMax() - GetArm1EtaMin()));
	237	if(ieta<=0 \|\| ieta>GetNEta()){
	238	cout << "TowerIndexFromEtaPhi:";
	239	cout << "ieta = "<< ieta << " eta=" << eta << " is outside of EMCAL. etamin=";
	240	cout << GetArm1EtaMin() << " to etamax=" << GetArm1EtaMax();
ca8f5bd0	241	cout << " returning -1" << endl;
	242	return -1;
	243	} // end if
e908f07f	244	iphi = 1 + (Int_t)(((Float_t)GetNPhi())*(phi-GetArm1PhiMin())/
e908f07f	245	((Float_t)(GetArm1PhiMax() - GetArm1PhiMin())));
ca8f5bd0	246	if(iphi<=0 \|\| iphi>GetNPhi()){
e908f07f	247	cout << "TowerIndexFromEtaPhi:";
e908f07f	248	cout << "iphi=" << iphi << " phi=" << phi << " is outside of EMCAL.";
ca8f5bd0	249	cout << " Phimin=" << GetArm1PhiMin() << " PhiMax=" << GetArm1PhiMax();
	250	cout << " returning -1" << endl;
	251	return -1;
	252	} // end if
e908f07f	253	return TowerIndex(ieta,iphi,0);
ca8f5bd0	254	}
ca8f5bd0	255	//______________________________________________________________________
a34b7b9f	256	Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0	257	// returns the pretower index number based on the eta and phi of the tower.
	258	// Inputs:
	259	// Float_t eta // eta of center of tower in pseudorapidity
	260	// Float_t phi // phi of center of tower in degrees
	261	// Outputs:
	262	// none.
	263	// Returned
	264	// Int_t index // PreTower index number [fNZfNPhi-2fNZ*fNPhi]
	265
e908f07f	266	return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
ca8f5bd0	267	}
ca8f5bd0	268	//______________________________________________________________________
a34b7b9f	269	Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
ca8f5bd0	270	// Converts the absolute numbering into the following array/
5a9318ff	271	// relid[0] = EMCAL Arm number 1:1
ca8f5bd0	272	// relid[1] = 0 Not in Pre Shower layers
	273	// = -1 In Pre Shower
	274	// relid[2] = Row number inside EMCAL
	275	// relid[3] = Column number inside EMCAL
	276	// Input:
	277	// Int_t AbsId // Tower index number [1-2fNZfNPhi]
	278	// Outputs:
	279	// Int_t *relid // array of 5. Discribed above.
	280	Bool_t rv = kTRUE ;
e908f07f	281	Int_t ieta=0,iphi=0,ipre=0,index=AbsId;
ca8f5bd0	282
e908f07f	283	TowerIndexes(index,ieta,iphi,ipre);
ca8f5bd0	284	relid[0] = 1;
ca8f5bd0	285	relid[1] = 0;
5a9318ff	286	if(ipre==1)
5a9318ff	287	relid[1] = -1;
e908f07f	288	relid[2] = ieta;
ca8f5bd0	289	relid[3] = iphi;
	290
	291	return rv;
	292	}
	293	//______________________________________________________________________
5a9318ff	294	void AliEMCALGeometry::PosInAlice(const Int_t *relid,Float_t &theta,
a34b7b9f	295	Float_t &phi) const {
5a9318ff	296	// Converts the relative numbering into the local EMCAL-module (x, z)
ca8f5bd0	297	// coordinates
e908f07f	298	Int_t ieta = relid[2]; // offset along x axis
ca8f5bd0	299	Int_t iphi = relid[3]; // offset along z axis
5a9318ff	300	Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
ca8f5bd0	301	Int_t index;
	302	Float_t eta;
	303
	304	if(ipre==-1) ipre = 1;
e908f07f	305	index = TowerIndex(ieta,iphi,ipre);
ca8f5bd0	306	EtaPhiFromIndex(index,eta,phi);
	307	theta = 180.(2.0TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
	308
	309	return;
	310	}
6119e5db	311
	312	//______________________________________________________________________
	313	void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
	314	// given the tower relative number it returns the X, Y and Z
	315	// of the tower.
	316
	317	// Outputs:
	318	// Float_t x // x of center of tower in cm
	319	// Float_t y // y of center of tower in cm
	320	// Float_t z // z of centre of tower in cm
	321	// Returned
	322	// none.
	323
	324	Float_t eta,theta, phi,cyl_radius,kDeg2Rad;
	325
	326	Int_t ieta = relid[2]; // offset along x axis
	327	Int_t iphi = relid[3]; // offset along z axis
	328	Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
	329	Int_t index;
	330
	331
	332	if(ipre==-1) ipre = 1;
	333	index = TowerIndex(ieta,iphi,ipre);
	334	EtaPhiFromIndex(index,eta,phi);
	335	theta = 180.(2.0TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
	336
	337
	338
	339	kDeg2Rad = TMath::Pi() / static_cast<Double_t>(180) ;
	340	cyl_radius = GetIPDistance()+ GetAirGap() ;
	341	x = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
	342	y = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
	343	z = cyl_radius / TMath::Tan(theta * kDeg2Rad ) ;
	344
	345	return;
	346	}
	347
ca8f5bd0	348	//______________________________________________________________________
ca8f5bd0	349	/*
a34b7b9f	350	Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
ca8f5bd0	351	// Returns kTRUE if the two towers are neighbours or not, including
	352	// diagonals. Both indexes are required to be either towers or preshower.
	353	// Inputs:
	354	// Int_t index1 // index of tower 1
	355	// Int_t index2 // index of tower 2
	356	// Outputs:
	357	// none.
	358	// Returned
	359	// Boot_t kTRUE if the towers are neighbours otherwise false.
	360	Boot_t anb = kFALSE;
e908f07f	361	Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0, ipre1 = 0, ipre2 = 0;
ca8f5bd0	362
e908f07f	363	TowerIndexes(index1,ieta1,iphi1,ipre1);
e908f07f	364	TowerIndexes(index2,ieta2,iphi2,ipre2);
ca8f5bd0	365	if(ipre1!=ipre2) return anb;
e908f07f	366	if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))
ca8f5bd0	367	anb = kTRUE;
	368	return anb;
	369	}
	370	*/