Using the recommended way of forward declarations for TVector and TMatrix (see v5...
[u/mrichter/AliRoot.git] / PHOS / AliPHOSGeometry.cxx
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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/* $Id$ */
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"
e957fea8 33#include "TParticle.h"
d15a28e7 34
35// --- Standard library ---
36
d15a28e7 37// --- AliRoot header files ---
351dd634 38#include "AliLog.h"
d15a28e7 39#include "AliPHOSGeometry.h"
468794ea 40#include "AliPHOSEMCAGeometry.h"
710f859a 41#include "AliPHOSRecPoint.h"
d15a28e7 42
925e6570 43ClassImp(AliPHOSGeometry)
d15a28e7 44
a4e98857 45// these initialisations are needed for a singleton
9ec91567 46AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
282c5906 47Bool_t AliPHOSGeometry::fgInit = kFALSE ;
9ec91567 48
d15a28e7 49//____________________________________________________________________________
e957fea8 50AliPHOSGeometry::AliPHOSGeometry() {
51 // default ctor
52 // must be kept public for root persistency purposes, but should never be called by the outside world
53 fPHOSAngle = 0 ;
54 fGeometryEMCA = 0 ;
55 fGeometrySUPP = 0 ;
56 fGeometryCPV = 0 ;
57 fgGeom = 0 ;
58 fRotMatrixArray = 0 ;
59}
60
61//____________________________________________________________________________
d15a28e7 62AliPHOSGeometry::~AliPHOSGeometry(void)
63{
b2a60966 64 // dtor
65
52a36ffd 66 if (fRotMatrixArray) fRotMatrixArray->Delete() ;
67 if (fRotMatrixArray) delete fRotMatrixArray ;
fa0bc588 68 if (fPHOSAngle ) delete[] fPHOSAngle ;
52a36ffd 69}
52a36ffd 70//____________________________________________________________________________
71
72void AliPHOSGeometry::Init(void)
73{
a4e98857 74 // Initializes the PHOS parameters :
75 // IHEP is the Protvino CPV (cathode pad chambers)
710f859a 76
809cd394 77 TString test(GetName()) ;
22b8277f 78 if (test != "IHEP" ) {
351dd634 79 AliFatal(Form("%s is not a known geometry (choose among IHEP)",
80 test.Data() )) ;
809cd394 81 }
82
710f859a 83 fgInit = kTRUE ;
84
85 fNModules = 5;
86 fAngle = 20;
87
88 fGeometryEMCA = new AliPHOSEMCAGeometry();
89
90 fGeometryCPV = new AliPHOSCPVGeometry ();
91
92 fGeometrySUPP = new AliPHOSSupportGeometry();
93
94 fPHOSAngle = new Float_t[fNModules] ;
95
96 Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
97
581e32d4 98 fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2.,
a83b6179 99 (Double_t)(emcParams[0] - (emcParams[1]-emcParams[0])*
100 fGeometryCPV->GetCPVBoxSize(1)/2/emcParams[3]));
710f859a 101 fPHOSParams[1] = emcParams[1] ;
581e32d4 102 fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
710f859a 103 fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
104
105 fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
106
107 Int_t index ;
108 for ( index = 0; index < fNModules; index++ )
52a36ffd 109 fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
710f859a 110
111 this->SetPHOSAngles() ;
112 fRotMatrixArray = new TObjArray(fNModules) ;
113
52a36ffd 114}
115
5ccb0008 116//____________________________________________________________________________
52a36ffd 117AliPHOSGeometry * AliPHOSGeometry::GetInstance()
118{
a4e98857 119 // Returns the pointer of the unique instance; singleton specific
120
809cd394 121 return static_cast<AliPHOSGeometry *>( fgGeom ) ;
52a36ffd 122}
123
124//____________________________________________________________________________
125AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
126{
127 // Returns the pointer of the unique instance
a4e98857 128 // Creates it with the specified options (name, title) if it does not exist yet
129
52a36ffd 130 AliPHOSGeometry * rv = 0 ;
131 if ( fgGeom == 0 ) {
132 if ( strcmp(name,"") == 0 )
133 rv = 0 ;
134 else {
135 fgGeom = new AliPHOSGeometry(name, title) ;
136 if ( fgInit )
137 rv = (AliPHOSGeometry * ) fgGeom ;
138 else {
139 rv = 0 ;
140 delete fgGeom ;
141 fgGeom = 0 ;
142 }
143 }
144 }
145 else {
21cd0c07 146 if ( strcmp(fgGeom->GetName(), name) != 0 )
351dd634 147 ::Error("GetInstance", "Current geometry is %s. You cannot call %s",
148 fgGeom->GetName(), name) ;
52a36ffd 149 else
150 rv = (AliPHOSGeometry *) fgGeom ;
151 }
152 return rv ;
153}
4697edca 154
52a36ffd 155//____________________________________________________________________________
156void AliPHOSGeometry::SetPHOSAngles()
157{
a4e98857 158 // Calculates the position of the PHOS modules in ALICE global coordinate system
52a36ffd 159
a8c47ab6 160 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
710f859a 161 Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
52a36ffd 162 pphi *= kRADDEG ;
710f859a 163 if (pphi > fAngle){
351dd634 164 AliError(Form("PHOS modules overlap!\n pphi = %f fAngle = %f",
165 pphi, fAngle));
710f859a 166
167 }
ed4205d8 168 pphi = fAngle;
52a36ffd 169
170 for( Int_t i = 1; i <= fNModules ; i++ ) {
ed4205d8 171 Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
52a36ffd 172 fPHOSAngle[i-1] = - angle ;
173 }
d15a28e7 174}
175
176//____________________________________________________________________________
fc7e2f43 177Bool_t AliPHOSGeometry::AbsToRelNumbering(Int_t AbsId, Int_t * relid) const
d15a28e7 178{
b2a60966 179 // Converts the absolute numbering into the following array/
180 // relid[0] = PHOS Module number 1:fNModules
181 // relid[1] = 0 if PbW04
710f859a 182 // = -1 if CPV
183 // relid[2] = Row number inside a PHOS module
184 // relid[3] = Column number inside a PHOS module
d15a28e7 185
186 Bool_t rv = kTRUE ;
92862013 187 Float_t id = AbsId ;
d15a28e7 188
710f859a 189 Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
d15a28e7 190
710f859a 191 if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
192
193 id -= GetNPhi() * GetNZ() * GetNModules() ;
194 Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
195 relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
196 relid[1] = -1 ;
197 id -= ( relid[0] - 1 ) * nCPV ;
198 relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
199 relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ;
d15a28e7 200 }
710f859a 201 else { // it is a PW04 crystal
d15a28e7 202
92862013 203 relid[0] = phosmodulenumber ;
204 relid[1] = 0 ;
205 id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
710f859a 206 relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
207 relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
d15a28e7 208 }
209 return rv ;
210}
52a36ffd 211
9f616d61 212//____________________________________________________________________________
fc7e2f43 213void AliPHOSGeometry::EmcModuleCoverage(Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
9f616d61 214{
a4e98857 215 // calculates the angular coverage in theta and phi of one EMC (=PHOS) module
9f616d61 216
217 Double_t conv ;
cf0c2bc1 218 if ( opt == Radian() )
9f616d61 219 conv = 1. ;
cf0c2bc1 220 else if ( opt == Degre() )
9f616d61 221 conv = 180. / TMath::Pi() ;
222 else {
351dd634 223 AliWarning(Form("%s unknown option; result in radian", opt)) ;
9f616d61 224 conv = 1. ;
225 }
226
710f859a 227 Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
228 Float_t y0 = GetIPtoCrystalSurface() ;
88cb7938 229 Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
230 Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ;
231 Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ;
232 Double_t angle = TMath::ATan( x0 / y0 ) ;
710f859a 233 phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
92862013 234 Double_t max = phi - angle ;
235 Double_t min = phi + angle ;
236 pM = TMath::Max(max, min) * conv ;
237 pm = TMath::Min(max, min) * conv ;
9f616d61 238
88cb7938 239 angle = TMath::ATan( z0 / y0 ) ;
92862013 240 max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
241 min = TMath::Pi() / 2. - angle ;
242 tM = TMath::Max(max, min) * conv ;
243 tm = TMath::Min(max, min) * conv ;
9f616d61 244
245}
246
247//____________________________________________________________________________
7b7c1533 248void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
9f616d61 249{
a4e98857 250 // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
9f616d61 251
252 Double_t conv ;
cf0c2bc1 253 if ( opt == Radian() )
9f616d61 254 conv = 1. ;
cf0c2bc1 255 else if ( opt == Degre() )
9f616d61 256 conv = 180. / TMath::Pi() ;
257 else {
351dd634 258 AliWarning(Form("%s unknown option; result in radian", opt)) ;
9f616d61 259 conv = 1. ;
260 }
261
710f859a 262 Float_t y0 = GetIPtoCrystalSurface() ;
92862013 263 theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
264 phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
9f616d61 265}
266
267
268//____________________________________________________________________________
e8d02863 269void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrixF & /*gmat*/) const
d15a28e7 270{
a4e98857 271 // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
b2a60966 272
d15a28e7 273 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013 274 TVector3 localposition ;
d15a28e7 275
276 tmpPHOS->GetLocalPosition(gpos) ;
277
278
279 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a 280 { gpos.SetY( - GetIPtoCrystalSurface()) ;
d15a28e7 281
282 }
283 else
710f859a 284 { // it is a CPV
285 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7 286 }
287
92862013 288 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
a8c47ab6 289 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
92862013 290 Float_t rphi = phi / kRADDEG ;
d15a28e7 291
92862013 292 TRotation rot ;
293 rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7 294
92862013 295 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
296 gpos.Transform(rot) ; // rotate the baby
6ad0bfa0 297
d15a28e7 298}
299
300//____________________________________________________________________________
5cda30f6 301void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
d15a28e7 302{
a4e98857 303 // Calculates the coordinates of a RecPoint in the ALICE global coordinate system
b2a60966 304
d15a28e7 305 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013 306 TVector3 localposition ;
d15a28e7 307 tmpPHOS->GetLocalPosition(gpos) ;
308
309
310 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a 311 { gpos.SetY( - GetIPtoCrystalSurface() ) ;
d15a28e7 312 }
313 else
710f859a 314 { // it is a CPV
315 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7 316 }
317
92862013 318 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
a8c47ab6 319 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
92862013 320 Float_t rphi = phi / kRADDEG ;
d15a28e7 321
92862013 322 TRotation rot ;
323 rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7 324
92862013 325 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
326 gpos.Transform(rot) ; // rotate the baby
d15a28e7 327}
328
329//____________________________________________________________________________
aa35fc01 330void AliPHOSGeometry::ImpactOnEmc(Double_t theta, Double_t phi, Int_t & moduleNumber, Double_t & z, Double_t & x) const
d15a28e7 331{
a4e98857 332 // calculates the impact coordinates on PHOS of a neutral particle
333 // emitted in the direction theta and phi in the ALICE global coordinate system
d15a28e7 334
52a36ffd 335 // searches for the PHOS EMC module
aa35fc01 336
337 moduleNumber = 0 ;
52a36ffd 338 Double_t tm, tM, pm, pM ;
339 Int_t index = 1 ;
aa35fc01 340 while ( moduleNumber == 0 && index <= GetNModules() ) {
52a36ffd 341 EmcModuleCoverage(index, tm, tM, pm, pM) ;
88cb7938 342 if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
aa35fc01 343 moduleNumber = index ;
52a36ffd 344 index++ ;
d15a28e7 345 }
aa35fc01 346 if ( moduleNumber != 0 ) {
347 Float_t phi0 = GetPHOSAngle(moduleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
710f859a 348 Float_t y0 = GetIPtoCrystalSurface() ;
88cb7938 349 Double_t angle = phi - phi0;
52a36ffd 350 x = y0 * TMath::Tan(angle) ;
351 angle = theta - TMath::Pi() / 2 ;
352 z = y0 * TMath::Tan(angle) ;
d15a28e7 353 }
d15a28e7 354}
355
e957fea8 356//____________________________________________________________________________
7b51037f 357void AliPHOSGeometry::ImpactOnEmc(const TVector3& vec, Int_t & moduleNumber, Double_t & z, Double_t & x) const
aa35fc01 358{
359 // calculates the impact coordinates on PHOS of a neutral particle
360 // emitted in the direction theta and phi in the ALICE global coordinate system
361 // searches for the PHOS EMC module
362
7b51037f 363 Double_t theta = vec.Theta() ;
364 Double_t phi = vec.Phi() ;
365
366 ImpactOnEmc(theta, phi, moduleNumber, z, x) ;
aa35fc01 367}
368
369//____________________________________________________________________________
7b51037f 370void AliPHOSGeometry::ImpactOnEmc(const TParticle& p, Int_t & moduleNumber, Double_t & z, Double_t & x) const
aa35fc01 371{
372 // calculates the impact coordinates on PHOS of a neutral particle
373 // emitted in the direction theta and phi in the ALICE global coordinate system
374
375 // searches for the PHOS EMC module
376 Double_t theta = p.Theta() ;
377 Double_t phi = p.Phi() ;
378
379 ImpactOnEmc(theta, phi, moduleNumber, z, x) ;
380}
381
382//____________________________________________________________________________
1c9d8212 383Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const
384{
e957fea8 385 // Tells if a particle enters PHOS
386 Bool_t in=kFALSE;
387 Int_t moduleNumber=0;
1c9d8212 388 Double_t z,x;
e957fea8 389 ImpactOnEmc(particle->Theta(),particle->Phi(),moduleNumber,z,x);
390 if(moduleNumber)
391 in=kTRUE;
392 else
393 in=kFALSE;
394 return in;
1c9d8212 395}
396
d15a28e7 397//____________________________________________________________________________
7b7c1533 398Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
d15a28e7 399{
b2a60966 400 // Converts the relative numbering into the absolute numbering
ed4205d8 401 // EMCA crystals:
402 // AbsId = from 1 to fNModules * fNPhi * fNZ
ed4205d8 403 // CPV pad:
404 // AbsId = from N(total PHOS crystals) + 1
405 // to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
d15a28e7 406
407 Bool_t rv = kTRUE ;
710f859a 408
409 if ( relid[1] == 0 ) { // it is a Phos crystal
52a36ffd 410 AbsId =
710f859a 411 ( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
412 + ( relid[2] - 1 ) * GetNZ() // the offset along phi
413 + relid[3] ; // the offset along z
d15a28e7 414 }
710f859a 415 else { // it is a CPV pad
416 AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
417 + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
418 + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
52a36ffd 419 + relid[3] ; // the column number
420 }
421
d15a28e7 422 return rv ;
423}
424
425//____________________________________________________________________________
426
fc7e2f43 427void AliPHOSGeometry::RelPosInAlice(Int_t id, TVector3 & pos ) const
d15a28e7 428{
a4e98857 429 // Converts the absolute numbering into the global ALICE coordinate system
b2a60966 430
ed4205d8 431
432 Int_t relid[4] ;
433
434 AbsToRelNumbering(id , relid) ;
435
436 Int_t phosmodule = relid[0] ;
437
438 Float_t y0 = 0 ;
439
710f859a 440 if ( relid[1] == 0 ) // it is a PbW04 crystal
441 y0 = - GetIPtoCrystalSurface() ;
442 else
443 y0 = - GetIPtoUpperCPVsurface() ;
444
ed4205d8 445 Float_t x, z ;
446 RelPosInModule(relid, x, z) ;
447
448 pos.SetX(x) ;
449 pos.SetZ(z) ;
710f859a 450 pos.SetY(y0) ;
ed4205d8 451
452 Float_t phi = GetPHOSAngle( phosmodule) ;
a8c47ab6 453 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
ed4205d8 454 Float_t rphi = phi / kRADDEG ;
455
456 TRotation rot ;
457 rot.RotateZ(-rphi) ; // a rotation around Z by angle
458
459 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
460
461 pos.Transform(rot) ; // rotate the baby
d15a28e7 462}
463
464//____________________________________________________________________________
5d0435dd 465void AliPHOSGeometry::RelPosToAbsId(Int_t module, Double_t x, Double_t z, Int_t & AbsId) const
842988a5 466{
467 // converts local PHOS-module (x, z) coordinates to absId
468 Int_t relid[4] ;
469 relid[0] = module ;
470 relid[1] = 0 ;
471 relid[2] = static_cast<Int_t>(TMath::Ceil( x/ GetCellStep() + GetNPhi() / 2.) );
472 relid[3] = static_cast<Int_t>(TMath::Ceil(-z/ GetCellStep() + GetNZ() / 2.) ) ;
473
474 RelToAbsNumbering(relid,AbsId) ;
475}
476
477//____________________________________________________________________________
7b7c1533 478void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
d15a28e7 479{
b2a60966 480 // Converts the relative numbering into the local PHOS-module (x, z) coordinates
52a36ffd 481 // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
b2a60966 482
786222b3 483 Int_t row = relid[2] ; //offset along x axis
484 Int_t column = relid[3] ; //offset along z axis
d15a28e7 485
ed4205d8 486
66c3e8ff 487 if ( relid[1] == 0 ) { // its a PbW04 crystal
488 x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect
4a76d472 489 z = - ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module
52a36ffd 490 }
491 else {
710f859a 492 x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
4a76d472 493 z = - ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module
52a36ffd 494 }
2f3366b6 495}
aa0b9641 496
497//____________________________________________________________________________
498
7b51037f 499void AliPHOSGeometry::GetModuleCenter(TVector3& center,
500 const char *det,
501 Int_t module) const
aa0b9641 502{
bfc17d18 503 // Returns a position of the center of the CPV or EMC module
1504ac47 504 Float_t rDet = 0.;
e77bb310 505 if (strcmp(det,"CPV") == 0) rDet = GetIPtoCPVDistance ();
506 else if (strcmp(det,"EMC") == 0) rDet = GetIPtoCrystalSurface();
351dd634 507 else
508 AliFatal(Form("Wrong detector name %s",det));
bfc17d18 509
395f4eea 510 Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees
511 angle *= TMath::Pi()/180;
512 angle += 3*TMath::Pi()/2.;
7b51037f 513 center.SetXYZ(rDet*TMath::Cos(angle), rDet*TMath::Sin(angle), 0.);
aa0b9641 514}
515
516//____________________________________________________________________________
517
7b51037f 518void AliPHOSGeometry::Global2Local(TVector3& localPosition,
519 const TVector3& globalPosition,
520 Int_t module) const
aa0b9641 521{
bfc17d18 522 // Transforms a global position of the rec.point to the local coordinate system
395f4eea 523 Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees
524 angle *= TMath::Pi()/180;
525 angle += 3*TMath::Pi()/2.;
7b51037f 526 localPosition = globalPosition;
527 localPosition.RotateZ(-angle);
aa0b9641 528}