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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 PHOS : singleton | |
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. | |
26 | // | |
27 | // -- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH) | |
28 | ||
29 | // --- ROOT system --- | |
30 | ||
31 | #include "TVector3.h" | |
32 | #include "TRotation.h" | |
33 | #include "TParticle.h" | |
34 | ||
35 | // --- Standard library --- | |
36 | ||
37 | // --- AliRoot header files --- | |
38 | #include "AliLog.h" | |
39 | #include "AliPHOSGeometry.h" | |
40 | #include "AliPHOSEMCAGeometry.h" | |
41 | #include "AliPHOSRecPoint.h" | |
42 | ||
43 | ClassImp(AliPHOSGeometry) | |
44 | ||
45 | // these initialisations are needed for a singleton | |
46 | AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ; | |
47 | Bool_t AliPHOSGeometry::fgInit = kFALSE ; | |
48 | ||
49 | //____________________________________________________________________________ | |
50 | AliPHOSGeometry::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 | //____________________________________________________________________________ | |
62 | AliPHOSGeometry::~AliPHOSGeometry(void) | |
63 | { | |
64 | // dtor | |
65 | ||
66 | if (fRotMatrixArray) fRotMatrixArray->Delete() ; | |
67 | if (fRotMatrixArray) delete fRotMatrixArray ; | |
68 | if (fPHOSAngle ) delete[] fPHOSAngle ; | |
69 | } | |
70 | //____________________________________________________________________________ | |
71 | ||
72 | void AliPHOSGeometry::Init(void) | |
73 | { | |
74 | // Initializes the PHOS parameters : | |
75 | // IHEP is the Protvino CPV (cathode pad chambers) | |
76 | ||
77 | TString test(GetName()) ; | |
78 | if (test != "IHEP" ) { | |
79 | AliFatal(Form("%s is not a known geometry (choose among IHEP)", | |
80 | test.Data() )) ; | |
81 | } | |
82 | ||
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 | ||
98 | fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2., | |
99 | (Double_t)(emcParams[0] - (emcParams[1]-emcParams[0])* | |
100 | fGeometryCPV->GetCPVBoxSize(1)/2/emcParams[3])); | |
101 | fPHOSParams[1] = emcParams[1] ; | |
102 | fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.); | |
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++ ) | |
109 | fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry() | |
110 | ||
111 | fRotMatrixArray = new TObjArray(fNModules) ; | |
112 | ||
113 | // Geometry parameters are calculated | |
114 | ||
115 | SetPHOSAngles(); | |
116 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; | |
117 | Float_t r = GetIPtoOuterCoverDistance() + fPHOSParams[3] - GetCPVBoxSize(1) ; | |
118 | for (Int_t iModule=0; iModule<fNModules; iModule++) { | |
119 | fModuleCenter[iModule][0] = r * TMath::Sin(fPHOSAngle[iModule] / kRADDEG ); | |
120 | fModuleCenter[iModule][1] =-r * TMath::Cos(fPHOSAngle[iModule] / kRADDEG ); | |
121 | fModuleCenter[iModule][2] = 0.; | |
122 | ||
123 | fModuleAngle[iModule][0][0] = 90; | |
124 | fModuleAngle[iModule][0][1] = fPHOSAngle[iModule]; | |
125 | fModuleAngle[iModule][1][0] = 0; | |
126 | fModuleAngle[iModule][1][1] = 0; | |
127 | fModuleAngle[iModule][2][0] = 90; | |
128 | fModuleAngle[iModule][2][1] = 270 + fPHOSAngle[iModule]; | |
129 | } | |
130 | ||
131 | } | |
132 | ||
133 | //____________________________________________________________________________ | |
134 | AliPHOSGeometry * AliPHOSGeometry::GetInstance() | |
135 | { | |
136 | // Returns the pointer of the unique instance; singleton specific | |
137 | ||
138 | return static_cast<AliPHOSGeometry *>( fgGeom ) ; | |
139 | } | |
140 | ||
141 | //____________________________________________________________________________ | |
142 | AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title) | |
143 | { | |
144 | // Returns the pointer of the unique instance | |
145 | // Creates it with the specified options (name, title) if it does not exist yet | |
146 | ||
147 | AliPHOSGeometry * rv = 0 ; | |
148 | if ( fgGeom == 0 ) { | |
149 | if ( strcmp(name,"") == 0 ) | |
150 | rv = 0 ; | |
151 | else { | |
152 | fgGeom = new AliPHOSGeometry(name, title) ; | |
153 | if ( fgInit ) | |
154 | rv = (AliPHOSGeometry * ) fgGeom ; | |
155 | else { | |
156 | rv = 0 ; | |
157 | delete fgGeom ; | |
158 | fgGeom = 0 ; | |
159 | } | |
160 | } | |
161 | } | |
162 | else { | |
163 | if ( strcmp(fgGeom->GetName(), name) != 0 ) | |
164 | ::Error("GetInstance", "Current geometry is %s. You cannot call %s", | |
165 | fgGeom->GetName(), name) ; | |
166 | else | |
167 | rv = (AliPHOSGeometry *) fgGeom ; | |
168 | } | |
169 | return rv ; | |
170 | } | |
171 | ||
172 | //____________________________________________________________________________ | |
173 | void AliPHOSGeometry::SetPHOSAngles() | |
174 | { | |
175 | // Calculates the position of the PHOS modules in ALICE global coordinate system | |
176 | ||
177 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; | |
178 | Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ; | |
179 | pphi *= kRADDEG ; | |
180 | if (pphi > fAngle){ | |
181 | AliError(Form("PHOS modules overlap!\n pphi = %f fAngle = %f", | |
182 | pphi, fAngle)); | |
183 | ||
184 | } | |
185 | pphi = fAngle; | |
186 | ||
187 | for( Int_t i = 1; i <= fNModules ; i++ ) { | |
188 | Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ; | |
189 | fPHOSAngle[i-1] = - angle ; | |
190 | } | |
191 | } | |
192 | ||
193 | //____________________________________________________________________________ | |
194 | Bool_t AliPHOSGeometry::AbsToRelNumbering(Int_t AbsId, Int_t * relid) const | |
195 | { | |
196 | // Converts the absolute numbering into the following array/ | |
197 | // relid[0] = PHOS Module number 1:fNModules | |
198 | // relid[1] = 0 if PbW04 | |
199 | // = -1 if CPV | |
200 | // relid[2] = Row number inside a PHOS module | |
201 | // relid[3] = Column number inside a PHOS module | |
202 | ||
203 | Bool_t rv = kTRUE ; | |
204 | Float_t id = AbsId ; | |
205 | ||
206 | Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ; | |
207 | ||
208 | if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad | |
209 | ||
210 | id -= GetNPhi() * GetNZ() * GetNModules() ; | |
211 | Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ; | |
212 | relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ; | |
213 | relid[1] = -1 ; | |
214 | id -= ( relid[0] - 1 ) * nCPV ; | |
215 | relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ; | |
216 | relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ; | |
217 | } | |
218 | else { // it is a PW04 crystal | |
219 | ||
220 | relid[0] = phosmodulenumber ; | |
221 | relid[1] = 0 ; | |
222 | id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ; | |
223 | relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ; | |
224 | relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ; | |
225 | } | |
226 | return rv ; | |
227 | } | |
228 | ||
229 | //____________________________________________________________________________ | |
230 | void AliPHOSGeometry::EmcModuleCoverage(Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const | |
231 | { | |
232 | // calculates the angular coverage in theta and phi of one EMC (=PHOS) module | |
233 | ||
234 | Double_t conv ; | |
235 | if ( opt == Radian() ) | |
236 | conv = 1. ; | |
237 | else if ( opt == Degre() ) | |
238 | conv = 180. / TMath::Pi() ; | |
239 | else { | |
240 | AliWarning(Form("%s unknown option; result in radian", opt)) ; | |
241 | conv = 1. ; | |
242 | } | |
243 | ||
244 | Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ; | |
245 | Float_t y0 = GetIPtoCrystalSurface() ; | |
246 | Float_t * strip = fGeometryEMCA->GetStripHalfSize() ; | |
247 | Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ; | |
248 | Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ; | |
249 | Double_t angle = TMath::ATan( x0 / y0 ) ; | |
250 | phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.) | |
251 | Double_t max = phi - angle ; | |
252 | Double_t min = phi + angle ; | |
253 | pM = TMath::Max(max, min) * conv ; | |
254 | pm = TMath::Min(max, min) * conv ; | |
255 | ||
256 | angle = TMath::ATan( z0 / y0 ) ; | |
257 | max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.) | |
258 | min = TMath::Pi() / 2. - angle ; | |
259 | tM = TMath::Max(max, min) * conv ; | |
260 | tm = TMath::Min(max, min) * conv ; | |
261 | ||
262 | } | |
263 | ||
264 | //____________________________________________________________________________ | |
265 | void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const | |
266 | { | |
267 | // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module | |
268 | ||
269 | Double_t conv ; | |
270 | if ( opt == Radian() ) | |
271 | conv = 1. ; | |
272 | else if ( opt == Degre() ) | |
273 | conv = 180. / TMath::Pi() ; | |
274 | else { | |
275 | AliWarning(Form("%s unknown option; result in radian", opt)) ; | |
276 | conv = 1. ; | |
277 | } | |
278 | ||
279 | Float_t y0 = GetIPtoCrystalSurface() ; | |
280 | theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ; | |
281 | phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ; | |
282 | } | |
283 | ||
284 | ||
285 | //____________________________________________________________________________ | |
286 | void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrixF & /*gmat*/) const | |
287 | { | |
288 | // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system | |
289 | ||
290 | AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ; | |
291 | TVector3 localposition ; | |
292 | ||
293 | tmpPHOS->GetLocalPosition(gpos) ; | |
294 | ||
295 | ||
296 | if ( tmpPHOS->IsEmc() ) // it is a EMC crystal | |
297 | { gpos.SetY( - GetIPtoCrystalSurface()) ; | |
298 | ||
299 | } | |
300 | else | |
301 | { // it is a CPV | |
302 | gpos.SetY(- GetIPtoUpperCPVsurface() ) ; | |
303 | } | |
304 | ||
305 | Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; | |
306 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; | |
307 | Float_t rphi = phi / kRADDEG ; | |
308 | ||
309 | TRotation rot ; | |
310 | rot.RotateZ(-rphi) ; // a rotation around Z by angle | |
311 | ||
312 | TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame | |
313 | gpos.Transform(rot) ; // rotate the baby | |
314 | ||
315 | } | |
316 | ||
317 | //____________________________________________________________________________ | |
318 | void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const | |
319 | { | |
320 | // Calculates the coordinates of a RecPoint in the ALICE global coordinate system | |
321 | ||
322 | AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ; | |
323 | TVector3 localposition ; | |
324 | tmpPHOS->GetLocalPosition(gpos) ; | |
325 | ||
326 | ||
327 | if ( tmpPHOS->IsEmc() ) // it is a EMC crystal | |
328 | { gpos.SetY( - GetIPtoCrystalSurface() ) ; | |
329 | } | |
330 | else | |
331 | { // it is a CPV | |
332 | gpos.SetY(- GetIPtoUpperCPVsurface() ) ; | |
333 | } | |
334 | ||
335 | Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; | |
336 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; | |
337 | Float_t rphi = phi / kRADDEG ; | |
338 | ||
339 | TRotation rot ; | |
340 | rot.RotateZ(-rphi) ; // a rotation around Z by angle | |
341 | ||
342 | TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame | |
343 | gpos.Transform(rot) ; // rotate the baby | |
344 | } | |
345 | ||
346 | //____________________________________________________________________________ | |
347 | void AliPHOSGeometry::ImpactOnEmc(Double_t theta, Double_t phi, Int_t & moduleNumber, Double_t & z, Double_t & x) const | |
348 | { | |
349 | // calculates the impact coordinates on PHOS of a neutral particle | |
350 | // emitted in the direction theta and phi in the ALICE global coordinate system | |
351 | ||
352 | // searches for the PHOS EMC module | |
353 | ||
354 | moduleNumber = 0 ; | |
355 | Double_t tm, tM, pm, pM ; | |
356 | Int_t index = 1 ; | |
357 | while ( moduleNumber == 0 && index <= GetNModules() ) { | |
358 | EmcModuleCoverage(index, tm, tM, pm, pM) ; | |
359 | if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) ) | |
360 | moduleNumber = index ; | |
361 | index++ ; | |
362 | } | |
363 | if ( moduleNumber != 0 ) { | |
364 | Float_t phi0 = GetPHOSAngle(moduleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ; | |
365 | Float_t y0 = GetIPtoCrystalSurface() ; | |
366 | Double_t angle = phi - phi0; | |
367 | x = y0 * TMath::Tan(angle) ; | |
368 | angle = theta - TMath::Pi() / 2 ; | |
369 | z = y0 * TMath::Tan(angle) ; | |
370 | } | |
371 | } | |
372 | ||
373 | //____________________________________________________________________________ | |
374 | void AliPHOSGeometry::ImpactOnEmc(const TVector3& vec, Int_t & moduleNumber, Double_t & z, Double_t & x) const | |
375 | { | |
376 | // calculates the impact coordinates on PHOS of a neutral particle | |
377 | // emitted in the direction theta and phi in the ALICE global coordinate system | |
378 | // searches for the PHOS EMC module | |
379 | ||
380 | Double_t theta = vec.Theta() ; | |
381 | Double_t phi = vec.Phi() ; | |
382 | ||
383 | ImpactOnEmc(theta, phi, moduleNumber, z, x) ; | |
384 | } | |
385 | ||
386 | //____________________________________________________________________________ | |
387 | void AliPHOSGeometry::ImpactOnEmc(const TParticle& p, Int_t & moduleNumber, Double_t & z, Double_t & x) const | |
388 | { | |
389 | // calculates the impact coordinates on PHOS of a neutral particle | |
390 | // emitted in the direction theta and phi in the ALICE global coordinate system | |
391 | ||
392 | // searches for the PHOS EMC module | |
393 | Double_t theta = p.Theta() ; | |
394 | Double_t phi = p.Phi() ; | |
395 | ||
396 | ImpactOnEmc(theta, phi, moduleNumber, z, x) ; | |
397 | } | |
398 | ||
399 | //____________________________________________________________________________ | |
400 | Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const | |
401 | { | |
402 | // Tells if a particle enters PHOS | |
403 | Bool_t in=kFALSE; | |
404 | Int_t moduleNumber=0; | |
405 | Double_t z,x; | |
406 | ImpactOnEmc(particle->Theta(),particle->Phi(),moduleNumber,z,x); | |
407 | if(moduleNumber) | |
408 | in=kTRUE; | |
409 | else | |
410 | in=kFALSE; | |
411 | return in; | |
412 | } | |
413 | ||
414 | //____________________________________________________________________________ | |
415 | Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const | |
416 | { | |
417 | // Converts the relative numbering into the absolute numbering | |
418 | // EMCA crystals: | |
419 | // AbsId = from 1 to fNModules * fNPhi * fNZ | |
420 | // CPV pad: | |
421 | // AbsId = from N(total PHOS crystals) + 1 | |
422 | // to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ | |
423 | ||
424 | Bool_t rv = kTRUE ; | |
425 | ||
426 | if ( relid[1] == 0 ) { // it is a Phos crystal | |
427 | AbsId = | |
428 | ( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules | |
429 | + ( relid[2] - 1 ) * GetNZ() // the offset along phi | |
430 | + relid[3] ; // the offset along z | |
431 | } | |
432 | else { // it is a CPV pad | |
433 | AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads | |
434 | + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules | |
435 | + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row | |
436 | + relid[3] ; // the column number | |
437 | } | |
438 | ||
439 | return rv ; | |
440 | } | |
441 | ||
442 | //____________________________________________________________________________ | |
443 | ||
444 | void AliPHOSGeometry::RelPosInAlice(Int_t id, TVector3 & pos ) const | |
445 | { | |
446 | // Converts the absolute numbering into the global ALICE coordinate system | |
447 | ||
448 | ||
449 | Int_t relid[4] ; | |
450 | ||
451 | AbsToRelNumbering(id , relid) ; | |
452 | ||
453 | Int_t phosmodule = relid[0] ; | |
454 | ||
455 | Float_t y0 = 0 ; | |
456 | ||
457 | if ( relid[1] == 0 ) // it is a PbW04 crystal | |
458 | y0 = - GetIPtoCrystalSurface() ; | |
459 | else | |
460 | y0 = - GetIPtoUpperCPVsurface() ; | |
461 | ||
462 | Float_t x, z ; | |
463 | RelPosInModule(relid, x, z) ; | |
464 | ||
465 | pos.SetX(x) ; | |
466 | pos.SetZ(z) ; | |
467 | pos.SetY(y0) ; | |
468 | ||
469 | Float_t phi = GetPHOSAngle( phosmodule) ; | |
470 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; | |
471 | Float_t rphi = phi / kRADDEG ; | |
472 | ||
473 | TRotation rot ; | |
474 | rot.RotateZ(-rphi) ; // a rotation around Z by angle | |
475 | ||
476 | TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame | |
477 | ||
478 | pos.Transform(rot) ; // rotate the baby | |
479 | } | |
480 | ||
481 | //____________________________________________________________________________ | |
482 | void AliPHOSGeometry::RelPosToAbsId(Int_t module, Double_t x, Double_t z, Int_t & AbsId) const | |
483 | { | |
484 | // converts local PHOS-module (x, z) coordinates to absId | |
485 | Int_t relid[4] ; | |
486 | relid[0] = module ; | |
487 | relid[1] = 0 ; | |
488 | relid[2] = static_cast<Int_t>(TMath::Ceil( x/ GetCellStep() + GetNPhi() / 2.) ); | |
489 | relid[3] = static_cast<Int_t>(TMath::Ceil(-z/ GetCellStep() + GetNZ() / 2.) ) ; | |
490 | ||
491 | RelToAbsNumbering(relid,AbsId) ; | |
492 | } | |
493 | ||
494 | //____________________________________________________________________________ | |
495 | void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const | |
496 | { | |
497 | // Converts the relative numbering into the local PHOS-module (x, z) coordinates | |
498 | // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000) | |
499 | ||
500 | Int_t row = relid[2] ; //offset along x axis | |
501 | Int_t column = relid[3] ; //offset along z axis | |
502 | ||
503 | ||
504 | if ( relid[1] == 0 ) { // its a PbW04 crystal | |
505 | x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect | |
506 | z = - ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module | |
507 | } | |
508 | else { | |
509 | x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect | |
510 | z = - ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module | |
511 | } | |
512 | } | |
513 | ||
514 | //____________________________________________________________________________ | |
515 | ||
516 | void AliPHOSGeometry::GetModuleCenter(TVector3& center, | |
517 | const char *det, | |
518 | Int_t module) const | |
519 | { | |
520 | // Returns a position of the center of the CPV or EMC module | |
521 | Float_t rDet = 0.; | |
522 | if (strcmp(det,"CPV") == 0) rDet = GetIPtoCPVDistance (); | |
523 | else if (strcmp(det,"EMC") == 0) rDet = GetIPtoCrystalSurface(); | |
524 | else | |
525 | AliFatal(Form("Wrong detector name %s",det)); | |
526 | ||
527 | Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees | |
528 | angle *= TMath::Pi()/180; | |
529 | angle += 3*TMath::Pi()/2.; | |
530 | center.SetXYZ(rDet*TMath::Cos(angle), rDet*TMath::Sin(angle), 0.); | |
531 | } | |
532 | ||
533 | //____________________________________________________________________________ | |
534 | ||
535 | void AliPHOSGeometry::Global2Local(TVector3& localPosition, | |
536 | const TVector3& globalPosition, | |
537 | Int_t module) const | |
538 | { | |
539 | // Transforms a global position of the rec.point to the local coordinate system | |
540 | Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees | |
541 | angle *= TMath::Pi()/180; | |
542 | angle += 3*TMath::Pi()/2.; | |
543 | localPosition = globalPosition; | |
544 | localPosition.RotateZ(-angle); | |
545 | } |