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Chamber half-planes of stations 3-5 at different z-positions.
[u/mrichter/AliRoot.git] / PHOS / AliPHOSCpvRecPoint.cxx
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458282ff 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// RecPoint implementation for PHOS-CPV
20// An CpvRecPoint is a cluster of digits
21//
22//*-- Author: Yuri Kharlov 30 October 2000
23// (after Dmitri Peressounko (RRC KI & SUBATECH))
24
25
26// --- ROOT system ---
27#include "TPad.h"
28#include "TH2.h"
29#include "TMath.h"
30#include "TCanvas.h"
31
32// --- Standard library ---
33
34#include <iostream.h>
35
36// --- AliRoot header files ---
37
38#include "AliPHOSGeometry.h"
39#include "AliPHOSCpvRecPoint.h"
40#include "AliRun.h"
41#include "AliPHOSIndexToObject.h"
42
43ClassImp(AliPHOSCpvRecPoint)
44
45//____________________________________________________________________________
46AliPHOSCpvRecPoint::AliPHOSCpvRecPoint(Float_t W0, Float_t LocMaxCut)
47 : AliPHOSRecPoint()
48{
49 // ctor
50
51 fMulDigit = 0 ;
52 fAmp = 0. ;
53 fEnergyList = new Float_t[fMaxDigit];
54 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
55 fDelta = phosgeom->GetCrystalSize(0) ;
56 fW0 = W0 ;
57 fLocMaxCut = LocMaxCut ;
58 fLocPos.SetX(1000000.) ; //Local position should be evaluated
59 fLengX = -1;
60 fLengZ = -1;
61}
62
63//____________________________________________________________________________
64AliPHOSCpvRecPoint::~AliPHOSCpvRecPoint()
65{
66 // dtor
67 if ( fEnergyList ) delete[] fEnergyList ;
68}
69
70//____________________________________________________________________________
71void AliPHOSCpvRecPoint::AddDigit(AliPHOSDigit & digit, Float_t Energy)
72{
73 // Adds a digit to the RecPoint
74 // and accumulates the total amplitude and the multiplicity
75
76 if ( fMulDigit >= fMaxDigit ) { // increase the size of the lists
77 fMaxDigit*=2 ;
78 Int_t * tempo = new ( Int_t[fMaxDigit] ) ;
79 Float_t * tempoE = new ( Float_t[fMaxDigit] ) ;
80
81 Int_t index ;
82 for ( index = 0 ; index < fMulDigit ; index++ ){
83 tempo[index] = fDigitsList[index] ;
84 tempoE[index] = fEnergyList[index] ;
85 }
86
87 delete [] fDigitsList ;
88 fDigitsList = new ( Int_t[fMaxDigit] ) ;
89
90 delete [] fEnergyList ;
91 fEnergyList = new ( Float_t[fMaxDigit] ) ;
92
93 for ( index = 0 ; index < fMulDigit ; index++ ){
94 fDigitsList[index] = tempo[index] ;
95 fEnergyList[index] = tempoE[index] ;
96 }
97
98 delete [] tempo ;
99 delete [] tempoE ;
100 } // if
101
102 fDigitsList[fMulDigit] = digit.GetIndexInList() ;
103 fEnergyList[fMulDigit] = Energy ;
104 fMulDigit++ ;
105 fAmp += Energy ;
106}
107
108//____________________________________________________________________________
109Bool_t AliPHOSCpvRecPoint::AreNeighbours(AliPHOSDigit * digit1, AliPHOSDigit * digit2 )
110{
111 // Tells if (true) or not (false) two digits are neighbors)
112
113 Bool_t aren = kFALSE ;
114
115 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
116 Int_t relid1[4] ;
117 phosgeom->AbsToRelNumbering(digit1->GetId(), relid1) ;
118
119 Int_t relid2[4] ;
120 phosgeom->AbsToRelNumbering(digit2->GetId(), relid2) ;
121
122 Int_t rowdiff = TMath::Abs( relid1[2] - relid2[2] ) ;
123 Int_t coldiff = TMath::Abs( relid1[3] - relid2[3] ) ;
124
125 if (( coldiff <= 1 ) && ( rowdiff <= 1 ) && (coldiff + rowdiff > 0))
126 aren = kTRUE ;
127
128 return aren ;
129}
130
131//____________________________________________________________________________
132Int_t AliPHOSCpvRecPoint::Compare(TObject * obj)
133{
134 // Compares two RecPoints according to their position in the PHOS modules
135
136 Int_t rv ;
137
138 AliPHOSCpvRecPoint * clu = (AliPHOSCpvRecPoint *)obj ;
139
140
141 Int_t phosmod1 = this->GetPHOSMod() ;
142 Int_t phosmod2 = clu->GetPHOSMod() ;
143
144 TVector3 locpos1;
145 this->GetLocalPosition(locpos1) ;
146 TVector3 locpos2;
147 clu->GetLocalPosition(locpos2) ;
148
149 if(phosmod1 == phosmod2 ) {
150 Int_t rowdif = (Int_t)TMath::Ceil(locpos1.X()/fDelta)-(Int_t)TMath::Ceil(locpos2.X()/fDelta) ;
151 if (rowdif> 0)
152 rv = -1 ;
153 else if(rowdif < 0)
154 rv = 1 ;
155 else if(locpos1.Z()>locpos2.Z())
156 rv = -1 ;
157 else
158 rv = 1 ;
159 }
160
161 else {
162 if(phosmod1 < phosmod2 )
163 rv = -1 ;
164 else
165 rv = 1 ;
166 }
167
168 return rv ;
169}
170
171//______________________________________________________________________________
172void AliPHOSCpvRecPoint::ExecuteEvent(Int_t event, Int_t px, Int_t py)
173{
174 // Execute action corresponding to one event
175 // This member function is called when a AliPHOSRecPoint is clicked with the locator
176 //
177 // If Left button is clicked on AliPHOSRecPoint, the digits are switched on
178 // and switched off when the mouse button is released.
179 //
180
181 // static Int_t pxold, pyold;
182
183 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
184
185 static TGraph * digitgraph = 0 ;
186
187 if (!gPad->IsEditable()) return;
188
189 TH2F * histo = 0 ;
190 TCanvas * histocanvas ;
191
192 switch (event) {
193
194 case kButton1Down: {
195 AliPHOSDigit * digit ;
196 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
197 Int_t iDigit;
198 Int_t relid[4] ;
199
200 const Int_t kMulDigit = AliPHOSCpvRecPoint::GetDigitsMultiplicity() ;
201 Float_t * xi = new Float_t[kMulDigit] ;
202 Float_t * zi = new Float_t[kMulDigit] ;
203
204 // create the histogram for the single cluster
205 // 1. gets histogram boundaries
206 Float_t ximax = -999. ;
207 Float_t zimax = -999. ;
208 Float_t ximin = 999. ;
209 Float_t zimin = 999. ;
210
211 for(iDigit=0; iDigit<kMulDigit; iDigit++) {
212 digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
213 phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
214 phosgeom->RelPosInModule(relid, xi[iDigit], zi[iDigit]);
215 if ( xi[iDigit] > ximax )
216 ximax = xi[iDigit] ;
217 if ( xi[iDigit] < ximin )
218 ximin = xi[iDigit] ;
219 if ( zi[iDigit] > zimax )
220 zimax = zi[iDigit] ;
221 if ( zi[iDigit] < zimin )
222 zimin = zi[iDigit] ;
223 }
224 ximax += phosgeom->GetCrystalSize(0) / 2. ;
225 zimax += phosgeom->GetCrystalSize(2) / 2. ;
226 ximin -= phosgeom->GetCrystalSize(0) / 2. ;
227 zimin -= phosgeom->GetCrystalSize(2) / 2. ;
228 Int_t xdim = (int)( (ximax - ximin ) / phosgeom->GetCrystalSize(0) + 0.5 ) ;
229 Int_t zdim = (int)( (zimax - zimin ) / phosgeom->GetCrystalSize(2) + 0.5 ) ;
230
231 // 2. gets the histogram title
232
233 Text_t title[100] ;
234 sprintf(title,"Energy=%1.2f GeV ; Digits ; %d ", GetEnergy(), GetDigitsMultiplicity()) ;
235
236 if (!histo) {
237 delete histo ;
238 histo = 0 ;
239 }
240 histo = new TH2F("cluster3D", title, xdim, ximin, ximax, zdim, zimin, zimax) ;
241
242 Float_t x, z ;
243 for(iDigit=0; iDigit<kMulDigit; iDigit++) {
244 digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
245 phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
246 phosgeom->RelPosInModule(relid, x, z);
247 histo->Fill(x, z, fEnergyList[iDigit] ) ;
248 }
249
250 if (!digitgraph) {
251 digitgraph = new TGraph(kMulDigit,xi,zi);
252 digitgraph-> SetMarkerStyle(5) ;
253 digitgraph-> SetMarkerSize(1.) ;
254 digitgraph-> SetMarkerColor(1) ;
255 digitgraph-> Paint("P") ;
256 }
257
258 Print() ;
259 histocanvas = new TCanvas("cluser", "a single cluster", 600, 500) ;
260 histocanvas->Draw() ;
261 histo->Draw("lego1") ;
262
263 delete[] xi ;
264 delete[] zi ;
265
266 break;
267 }
268
269 case kButton1Up:
270 if (digitgraph) {
271 delete digitgraph ;
272 digitgraph = 0 ;
273 }
274 break;
275
276 }
277}
278
279//____________________________________________________________________________
280Float_t AliPHOSCpvRecPoint::GetDispersion()
281{
282 // Calculates the dispersion of the shower at the origine of the RecPoint
283
284 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
285
286 Float_t d = 0 ;
287 Float_t wtot = 0 ;
288
289 TVector3 locpos;
290 GetLocalPosition(locpos);
291 Float_t x = locpos.X() ;
292 Float_t z = locpos.Z() ;
293
294 AliPHOSDigit * digit ;
295 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
296
297 Int_t iDigit;
298 for(iDigit=0; iDigit < fMulDigit; iDigit++) {
299 digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
300 Int_t relid[4] ;
301 Float_t xi ;
302 Float_t zi ;
303 phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
304 phosgeom->RelPosInModule(relid, xi, zi);
305 Float_t w = TMath::Max(0.,fW0+TMath::Log(fEnergyList[iDigit]/fAmp ) ) ;
306 d += w*((xi-x)*(xi-x) + (zi-z)*(zi-z) ) ;
307 wtot+=w ;
308 }
309
310 d /= wtot ;
311
312 return TMath::Sqrt(d) ;
313}
314
315//____________________________________________________________________________
316void AliPHOSCpvRecPoint::GetElipsAxis(Float_t * lambda)
317{
318 // Calculates the axis of the shower ellipsoid
319
320 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
321
322 Float_t wtot = 0. ;
323 Float_t x = 0.;
324 Float_t z = 0.;
325 Float_t dxx = 0.;
326 Float_t dzz = 0.;
327 Float_t dxz = 0.;
328
329 AliPHOSDigit * digit ;
330 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
331 Int_t iDigit;
332
333 for(iDigit=0; iDigit<fMulDigit; iDigit++) {
334 digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
335 Int_t relid[4] ;
336 Float_t xi ;
337 Float_t zi ;
338 phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
339 phosgeom->RelPosInModule(relid, xi, zi);
340 Float_t w = TMath::Max(0.,fW0+TMath::Log(fEnergyList[iDigit]/fAmp ) ) ;
341 dxx += w * xi * xi ;
342 x += w * xi ;
343 dzz += w * zi * zi ;
344 z += w * zi ;
345 dxz += w * xi * zi ;
346 wtot += w ;
347 }
348
349 dxx /= wtot ;
350 x /= wtot ;
351 dxx -= x * x ;
352 dzz /= wtot ;
353 z /= wtot ;
354 dzz -= z * z ;
355 dxz /= wtot ;
356 dxz -= x * z ;
357
358 Float_t tmp0 = 0.5 * (dxx + dzz) + TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz );
359 Float_t tmp1 = 0.5 * (dxx + dzz) - TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz );
360 if (tmp0>=0) lambda[0] = TMath::Sqrt(tmp0);
361 else lambda[0] = -TMath::Sqrt(-tmp0);
362 if (tmp1>=0) lambda[1] = TMath::Sqrt(tmp1);
363 else lambda[1] = -TMath::Sqrt(-tmp1);
364// lambda[0] = TMath::Sqrt( 0.5 * (dxx + dzz) + TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz ) ) ;
365// lambda[1] = TMath::Sqrt( 0.5 * (dxx + dzz) - TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz ) ) ;
366}
367
368//____________________________________________________________________________
369void AliPHOSCpvRecPoint::GetLocalPosition(TVector3 &LPos)
370{
371 // Calculates the center of gravity in the local PHOS-module coordinates
372
373 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
374
375 if( fLocPos.X() < 1000000.) { // already evaluated
376 LPos = fLocPos ;
377 return ;
378 }
379
380 Float_t wtot = 0. ;
381
382 Int_t relid[4] ;
383
384 Float_t x = 0. ;
385 Float_t z = 0. ;
386
387 AliPHOSDigit * digit ;
388
389 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
390
391 Int_t iDigit;
392
393 for(iDigit=0; iDigit<fMulDigit; iDigit++) {
394 digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) );
395
396 Float_t xi ;
397 Float_t zi ;
398 phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
399 phosgeom->RelPosInModule(relid, xi, zi);
400 Float_t w = TMath::Max( 0., fW0 + TMath::Log( fEnergyList[iDigit] / fAmp ) ) ;
401 x += xi * w ;
402 z += zi * w ;
403 wtot += w ;
404 }
405
406 if (wtot != 0) {
407 x /= wtot ;
408 z /= wtot ;
409 } else {
410 x = -1e6 ;
411 z = -1e6 ;
412 if (fMulDigit != 0) cout << "AliPHOSCpvRecPoint: too low log weight factor "
413 << "to evaluate cluster's center\n";
414 }
415 fLocPos.SetX(x) ;
416 fLocPos.SetY(0.) ;
417 fLocPos.SetZ(z) ;
418
419 LPos = fLocPos ;
420}
421
422//____________________________________________________________________________
423void AliPHOSCpvRecPoint::GetClusterLengths(Int_t &lengX, Int_t &lengZ)
424{
425 // Calculates the cluster lengths along X and Z axes
426 // These characteristics are needed for CPV to tune
427 // digitization+reconstruction to experimental data
428 // Yuri Kharlov. 24 October 2000
429
430 if( fLengX != -1 && fLengZ != -1 ) { // already evaluated
431 lengX = fLengX ;
432 lengZ = fLengZ ;
433 return ;
434 }
435
436 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
437
438 Int_t relid[4] ;
439
440 AliPHOSDigit * digit ;
441
442 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
443
444 const Int_t maxleng=20;
445 Int_t idX[maxleng], idZ[maxleng];
446 lengX = 0;
447 lengZ = 0;
448 Bool_t dejavu;
449
450 for(Int_t iDigit=0; iDigit<fMulDigit; iDigit++) {
451 digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) );
452 Int_t absId = digit->GetId();
453 phosgeom->AbsToRelNumbering(absId, relid) ;
454
455 dejavu=kFALSE;
456 for (Int_t i=0; i<lengX; i++) if (relid[2]==idX[i]) { dejavu=kTRUE; break; }
457 if (!dejavu) {
458 idX[lengX]=relid[2];
459 lengX++;
460 lengX = TMath::Min(lengX,maxleng);
461 }
462
463 dejavu=kFALSE;
464 for (Int_t i=0; i<lengZ; i++) if (relid[3]==idZ[i]) { dejavu=kTRUE; break; }
465 if (!dejavu) {
466 idZ[lengZ]=relid[3];
467 lengZ++;
468 lengZ = TMath::Min(lengZ,maxleng);
469 }
470 }
471 fLengX = lengX;
472 fLengZ = lengZ;
473}
474
475//____________________________________________________________________________
476Float_t AliPHOSCpvRecPoint::GetMaximalEnergy(void)
477{
478 // Finds the maximum energy in the cluster
479
480 Float_t menergy = 0. ;
481
482 Int_t iDigit;
483
484 for(iDigit=0; iDigit<fMulDigit; iDigit++) {
485
486 if(fEnergyList[iDigit] > menergy)
487 menergy = fEnergyList[iDigit] ;
488 }
489 return menergy ;
490}
491
492//____________________________________________________________________________
493Int_t AliPHOSCpvRecPoint::GetMultiplicityAtLevel(const Float_t H)
494{
495 // Calculates the multiplicity of digits with energy larger than H*energy
496
497 Int_t multipl = 0 ;
498 Int_t iDigit ;
499 for(iDigit=0; iDigit<fMulDigit; iDigit++) {
500
501 if(fEnergyList[iDigit] > H * fAmp)
502 multipl++ ;
503 }
504 return multipl ;
505}
506
507//____________________________________________________________________________
508Int_t AliPHOSCpvRecPoint::GetNumberOfLocalMax(Int_t * maxAt, Float_t * maxAtEnergy)
509{
510 // Calculates the number of local maxima in the cluster using fLocalMaxCut as the minimum
511 // energy difference between two local maxima
512
513 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
514
515 AliPHOSDigit * digit ;
516 AliPHOSDigit * digitN ;
517
518
519 Int_t iDigitN ;
520 Int_t iDigit ;
521
522 for(iDigit = 0; iDigit < fMulDigit; iDigit++){
523 maxAt[iDigit] = (Int_t) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
524 }
525
526 for(iDigit = 0 ; iDigit < fMulDigit; iDigit++) {
527 if(maxAt[iDigit] != -1) {
528 digit = (AliPHOSDigit *) maxAt[iDigit] ;
529
530 for(iDigitN = 0; iDigitN < fMulDigit; iDigitN++) {
531 digitN = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigitN]) ) ;
532
533 if ( AreNeighbours(digit, digitN) ) {
534 if (fEnergyList[iDigit] > fEnergyList[iDigitN] ) {
535 maxAt[iDigitN] = -1 ;
536 // but may be digit too is not local max ?
537 if(fEnergyList[iDigit] < fEnergyList[iDigitN] + fLocMaxCut)
538 maxAt[iDigit] = -1 ;
539 }
540 else {
541 maxAt[iDigit] = -1 ;
542 // but may be digitN too is not local max ?
543 if(fEnergyList[iDigit] > fEnergyList[iDigitN] - fLocMaxCut)
544 maxAt[iDigitN] = -1 ;
545 }
546 } // if Areneighbours
547 } // while digitN
548 } // slot not empty
549 } // while digit
550
551 iDigitN = 0 ;
552 for(iDigit = 0; iDigit < fMulDigit; iDigit++) {
553 if(maxAt[iDigit] != -1){
554 maxAt[iDigitN] = maxAt[iDigit] ;
555 maxAtEnergy[iDigitN] = fEnergyList[iDigit] ;
556 iDigitN++ ;
557 }
558 }
559 return iDigitN ;
560}
561
562
563//____________________________________________________________________________
564void AliPHOSCpvRecPoint::Print(Option_t * option)
565{
566 // Print the list of digits belonging to the cluster
567
568 cout << "AliPHOSCpvRecPoint: " << endl ;
569
570 AliPHOSDigit * digit ;
571 Int_t iDigit;
572 AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
573
574 Float_t xi ;
575 Float_t zi ;
576 Int_t relid[4] ;
577
578 AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
579
580 for(iDigit=0; iDigit<fMulDigit; iDigit++) {
581 digit = please->GimeDigit( fDigitsList[iDigit] ) ;
582 phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
583 phosgeom->RelPosInModule(relid, xi, zi);
584 cout << " Id = " << digit->GetId() ;
585 cout << " module = " << relid[0] ;
586 cout << " x = " << xi ;
587 cout << " z = " << zi ;
588 cout << " Energy = " << fEnergyList[iDigit] << endl ;
589 }
590 cout << " Multiplicity = " << fMulDigit << endl ;
591 cout << " Cluster Energy = " << fAmp << endl ;
592 cout << " Stored at position " << GetIndexInList() << endl ;
593
594}