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c98c0281 | 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 | **************************************************************************/ | |
04366a57 | 15 | //////////////////////////////////////////////////////////////////////////// |
16 | // Cluster finder /// | |
17 | // for Silicon pixels // | |
18 | // // | |
19 | //////////////////////////////////////////////////////////////////////////// | |
c98c0281 | 20 | #include "AliITSClusterFinderSPD.h" |
21 | #include "AliITS.h" | |
e869281d | 22 | #include "AliITSdigitSPD.h" |
41b19549 | 23 | #include "AliITSRawClusterSPD.h" |
c98c0281 | 24 | #include "AliITSRecPoint.h" |
aacedc3e | 25 | #include "AliITSresponseSPD.h" |
26 | #include "AliITSsegmentationSPD.h" | |
c98c0281 | 27 | #include "AliRun.h" |
28 | ||
9e1e0cd7 | 29 | //#define DEBUG |
c98c0281 | 30 | |
31 | ClassImp(AliITSClusterFinderSPD) | |
32 | ||
aacedc3e | 33 | //______________________________________________________________________ |
34 | AliITSClusterFinderSPD::AliITSClusterFinderSPD():AliITSClusterFinder(), | |
35 | fDz(0.0), | |
36 | fDx(0.0), | |
37 | fMinNCells(0){ | |
38 | // constructor | |
39 | } | |
c98c0281 | 40 | //---------------------------------------------------------- |
9e1e0cd7 | 41 | AliITSClusterFinderSPD::AliITSClusterFinderSPD(AliITSsegmentation *seg, |
aacedc3e | 42 | AliITSresponse *res): |
43 | AliITSClusterFinder(seg,res), | |
44 | fDz(0.0), | |
45 | fDx(0.0), | |
46 | fMinNCells(0){ | |
9e1e0cd7 | 47 | // constructor |
48 | ||
c98c0281 | 49 | SetDx(); |
50 | SetDz(); | |
51 | } | |
aacedc3e | 52 | //---------------------------------------------------------- |
53 | AliITSClusterFinderSPD::AliITSClusterFinderSPD(AliITSsegmentation *seg, | |
54 | TClonesArray *digits, | |
55 | TClonesArray *recp): | |
56 | AliITSClusterFinder(seg,0), | |
57 | fDz(0.0), | |
58 | fDx(0.0), | |
59 | fMinNCells(0){ | |
9e1e0cd7 | 60 | // constructor |
61 | ||
aacedc3e | 62 | SetDigits(digits); |
63 | SetClusters(recp); | |
9e1e0cd7 | 64 | SetDx(); |
65 | SetDz(); | |
c98c0281 | 66 | } |
9e1e0cd7 | 67 | |
9e1e0cd7 | 68 | //______________________________________________________________________ |
04366a57 | 69 | AliITSClusterFinderSPD::AliITSClusterFinderSPD(const AliITSClusterFinderSPD &source) : AliITSClusterFinder(source) { |
70 | // Copy constructor | |
71 | // Copies are not allowed. The method is protected to avoid misuse. | |
72 | Fatal("AliITSClusterFinderSPD","Copy constructor not allowed\n"); | |
73 | } | |
9e1e0cd7 | 74 | |
04366a57 | 75 | //______________________________________________________________________ |
76 | AliITSClusterFinderSPD& AliITSClusterFinderSPD::operator=(const AliITSClusterFinderSPD& /* source */){ | |
77 | // Assignment operator | |
78 | // Assignment is not allowed. The method is protected to avoid misuse. | |
79 | Fatal("= operator","Assignment operator not allowed\n"); | |
80 | return *this; | |
c98c0281 | 81 | } |
9e1e0cd7 | 82 | //______________________________________________________________________ |
83 | void AliITSClusterFinderSPD::FindRawClusters(Int_t module){ | |
84 | // input of Cluster Finder | |
85 | Int_t digitcount = 0; | |
86 | Int_t numberd = 100000; | |
c98c0281 | 87 | Int_t *digx = new Int_t[numberd]; |
88 | Int_t *digz = new Int_t[numberd]; | |
89 | Int_t *digtr1 = new Int_t[numberd]; | |
90 | Int_t *digtr2 = new Int_t[numberd]; | |
91 | Int_t *digtr3 = new Int_t[numberd]; | |
92 | Int_t *digtr4 = new Int_t[numberd]; | |
c98c0281 | 93 | // output of Cluster Finder |
9e1e0cd7 | 94 | Int_t numberc = 10000; |
aacedc3e | 95 | Double_t *xcenterl = new Double_t[numberc]; |
96 | Double_t *zcenterl = new Double_t[numberc]; | |
97 | Double_t *errxcenter = new Double_t[numberc]; | |
98 | Double_t *errzcenter = new Double_t[numberc]; | |
c98c0281 | 99 | Int_t *tr1clus = new Int_t[numberc]; |
100 | Int_t *tr2clus = new Int_t[numberc]; | |
101 | Int_t *tr3clus = new Int_t[numberc]; | |
9e1e0cd7 | 102 | Int_t nclus; |
c98c0281 | 103 | |
aacedc3e | 104 | SetModule(module); |
c98c0281 | 105 | digitcount=0; |
aacedc3e | 106 | Int_t ndigits = Digits()->GetEntriesFast(); |
c98c0281 | 107 | if (!ndigits) return; |
108 | ||
ee86d557 | 109 | AliITSdigitSPD *dig; |
aacedc3e | 110 | Int_t ndig=0,i; |
5d766c75 | 111 | /* |
aacedc3e | 112 | if(GetDebug(4)){ |
5d766c75 | 113 | cout << "SPD - FindRawclusters"<<endl; |
fc9f1fd2 | 114 | scanf("%d",&ndig); |
aacedc3e | 115 | } // end if GetDebug |
5d766c75 | 116 | */ |
c98c0281 | 117 | for(ndig=0; ndig<ndigits; ndig++) { |
aacedc3e | 118 | dig= (AliITSdigitSPD*)GetDigit(ndig); |
119 | digx[digitcount] = dig->GetCoord2()+1; //starts at 1 | |
120 | digz[digitcount] = dig->GetCoord1()+1; //starts at 1 | |
121 | digtr1[digitcount] = dig->GetTrack(0); | |
122 | digtr2[digitcount] = -3; | |
123 | digtr3[digitcount] = -3; | |
124 | if(GetDebug(5)){ | |
125 | cout << "digtr1["<<digitcount <<"]="<<digtr1[digitcount]; | |
126 | cout << " fTracks["<<0<<"]="<<dig->GetTrack(0)<<": "; | |
127 | } // end if GetDebug | |
128 | i=1; | |
129 | while(digtr1[digitcount]==dig->GetTrack(i) && i<dig->GetNTracks()) i++; | |
130 | if(GetDebug(5)) cout << " fTracks["<<i<<"]="<<dig->GetTrack(i); | |
131 | if(i<dig->GetNTracks()){ | |
132 | digtr2[digitcount] = dig->GetTrack(i); | |
133 | if(GetDebug(5)) cout<<"digtr2["<<digitcount <<"]=" | |
134 | <<digtr2[digitcount]<<": "; | |
135 | while((digtr1[digitcount]==dig->GetTrack(i) || | |
136 | digtr2[digitcount]==dig->GetTrack(i))&& | |
137 | i<=dig->GetNTracks()) i++; | |
138 | if(i<dig->GetNTracks()) digtr3[digitcount] = dig->GetTrack(i); | |
139 | if(GetDebug(5)){ | |
140 | cout << " fTracks["<<i<<"]="; | |
141 | if(i<dig->GetNTracks()) cout <<dig->GetTrack(i); | |
142 | cout << "digtr3["<<digitcount <<"]="<<digtr3[digitcount]; | |
143 | } // end if GetDebug | |
144 | } // end if | |
145 | if(GetDebug(4)) cout<<endl; | |
146 | digtr4[digitcount] = dig->GetSignal(); | |
147 | digitcount++; | |
9e1e0cd7 | 148 | } // end for ndig |
c98c0281 | 149 | ClusterFinder(digitcount,digx,digz,digtr1,digtr2,digtr3,digtr4, |
aacedc3e | 150 | nclus,xcenterl,zcenterl,errxcenter,errzcenter, |
151 | tr1clus, tr2clus, tr3clus); | |
c98c0281 | 152 | DigitToPoint(nclus,xcenterl,zcenterl,errxcenter,errzcenter, |
aacedc3e | 153 | tr1clus, tr2clus, tr3clus); |
9e1e0cd7 | 154 | delete[] digx; |
155 | delete[] digz; | |
156 | delete[] digtr1; | |
157 | delete[] digtr2; | |
158 | delete[] digtr3; | |
159 | delete[] digtr4; | |
160 | delete[] xcenterl; | |
161 | delete[] zcenterl; | |
162 | delete[] errxcenter; | |
163 | delete[] errzcenter; | |
164 | delete[] tr1clus; | |
165 | delete[] tr2clus; | |
166 | delete[] tr3clus; | |
c98c0281 | 167 | } |
9e1e0cd7 | 168 | //---------------------------------------------------------------------- |
169 | void AliITSClusterFinderSPD::ClusterFinder(Int_t ndigits,Int_t digx[], | |
170 | Int_t digz[],Int_t digtr1[], | |
171 | Int_t digtr2[],Int_t digtr3[], | |
172 | Int_t digtr4[],Int_t &nclus, | |
aacedc3e | 173 | Double_t xcenter[],Double_t zcenter[], |
174 | Double_t errxcenter[], | |
175 | Double_t errzcenter[], | |
9e1e0cd7 | 176 | Int_t tr1clus[],Int_t tr2clus[], |
aacedc3e | 177 | Int_t tr3clus[]){ |
9e1e0cd7 | 178 | // Search for clusters of fired pixels (digits). Two digits are linked |
179 | // inside a cluster if they are countiguous both in row or column | |
180 | // direction. Diagonal digits are not linked. | |
181 | // xcenter, ycenter, zcenter are the coordinates of the center | |
182 | // of each found cluster, calculated from the averaging the corresponding | |
183 | // coordinate of the center of the linked digits. The coordinates are | |
184 | // given in the local reference sistem. | |
185 | // errxcenter, errycenter, errzcenter are the errors associated to | |
186 | // the corresponding average. | |
187 | Int_t if1, min, max, nd; | |
188 | Int_t x1, z1, t1, t2, t3, t4; | |
189 | Int_t ndx, ndz, ndxmin=0, ndxmax=0, ndzmin=0, ndzmax=0; | |
aacedc3e | 190 | Double_t dx, dz; |
9e1e0cd7 | 191 | Int_t i,k,ipos=0; |
192 | Float_t xdum, zdum; | |
193 | Int_t kmax, sigmax; | |
aacedc3e | 194 | Double_t deltax, deltaz; |
195 | Double_t ndig; | |
9e1e0cd7 | 196 | Int_t numberd = 10000; |
197 | Int_t *ifpad = new Int_t[numberd]; | |
198 | Int_t *xpad = new Int_t[numberd]; | |
199 | Int_t *zpad = new Int_t[numberd]; | |
200 | Int_t *tr1pad = new Int_t[numberd]; | |
201 | Int_t *tr2pad = new Int_t[numberd]; | |
202 | Int_t *tr3pad = new Int_t[numberd]; | |
203 | Int_t *tr4pad = new Int_t[numberd]; | |
204 | Int_t *iclus = new Int_t[numberd]; | |
205 | ||
206 | nclus=1; | |
207 | for (i=0; i < ndigits ; i++){ | |
aacedc3e | 208 | ifpad[i] = -1; |
209 | iclus[i] = 0; | |
9e1e0cd7 | 210 | } // end for i |
211 | ||
212 | ifpad[0]=0; | |
213 | for (i=0; i < ndigits-1 ; i++) { | |
aacedc3e | 214 | if ( ifpad[i] == -1 ) { |
215 | nclus++; | |
216 | ipos++; | |
217 | ifpad[i]=nclus-1; | |
218 | } // end if ipad[i] | |
219 | for (Int_t j=i+1 ; j < ndigits ; j++) { | |
220 | if (ifpad[j]== -1 ) { | |
221 | dx = TMath::Abs(digx[i]-digx[j]); | |
222 | dz = TMath::Abs(digz[i]-digz[j]); | |
223 | // if ( ( dx+dz )==1 ) //clusters are not diagonal | |
224 | if(( dx+dz )==1 || (dx==1 && dz==1)){ | |
225 | //diagonal clusters allowed | |
226 | ipos++; | |
227 | ifpad[j] = ifpad[i]; | |
228 | ||
229 | x1 = digx[j]; | |
230 | z1 = digz[j]; | |
231 | digx[j] = digx[ipos]; | |
232 | digz[j] = digz[ipos]; | |
233 | digx[ipos] = x1; | |
234 | digz[ipos] = z1; | |
235 | ||
236 | t1 = digtr1[j]; | |
237 | t2 = digtr2[j]; | |
238 | t3 = digtr3[j]; | |
239 | t4 = digtr4[j]; | |
240 | digtr1[j] = digtr1[ipos]; | |
241 | digtr2[j] = digtr2[ipos]; | |
242 | digtr3[j] = digtr3[ipos]; | |
243 | digtr4[j] = digtr4[ipos]; | |
244 | digtr1[ipos] = t1; | |
245 | digtr2[ipos] = t2; | |
246 | digtr3[ipos] = t3; | |
247 | digtr4[ipos] = t4; | |
248 | ||
249 | if1 = ifpad[j]; | |
250 | ifpad[j] = ifpad[ipos]; | |
251 | ifpad[ipos] = if1; | |
252 | } // end dx+dx... | |
253 | }// end if ifpad[j]== -1 | |
254 | } // end for j | |
9e1e0cd7 | 255 | }//end loop on digits |
256 | if ( ifpad[ndigits-1] == -1 ) { | |
aacedc3e | 257 | nclus++; |
258 | ifpad[ndigits-1]=nclus-1; | |
9e1e0cd7 | 259 | } // end if ifpad[ndigits-1] == -1 |
aacedc3e | 260 | |
9e1e0cd7 | 261 | for (i=0 ; i < ndigits ; i++) iclus[ifpad[i]]++; |
262 | ||
263 | min=0; | |
264 | max=0; | |
265 | // loop on found clusters | |
266 | for (i=0 ; i < nclus ; i++){ | |
aacedc3e | 267 | min = max; |
268 | max += iclus[i]; | |
269 | deltax = GetSeg()->Dpx(0); | |
270 | if (iclus[i]!=1){ | |
271 | //cluster with more than one digit | |
272 | nd=iclus[i]; | |
273 | ndig=(Double_t) nd; | |
274 | Int_t count=0; | |
275 | for (k=min;k<min+nd;k++){ | |
276 | xpad[count] = digx[k]; | |
277 | zpad[count] = digz[k]; | |
9e1e0cd7 | 278 | |
aacedc3e | 279 | tr1pad[count] = digtr1[k]; |
280 | tr2pad[count] = digtr2[k]; | |
281 | tr3pad[count] = digtr3[k]; | |
282 | tr4pad[count] = digtr4[k]; | |
283 | ||
284 | count++; | |
285 | } // end for k | |
286 | ndxmin = xpad[TMath::LocMin(nd,xpad)]; | |
287 | ndxmax = xpad[TMath::LocMax(nd,xpad)]; | |
288 | ndzmin = zpad[TMath::LocMin(nd,zpad)]; | |
289 | ndzmax = zpad[TMath::LocMax(nd,zpad)]; | |
290 | ndx = ndxmax - ndxmin+1; | |
291 | ndz = ndzmax - ndzmin+1; | |
292 | ||
293 | // calculate x and z coordinates of the center of the cluster | |
294 | GetSeg()->GetPadCxz(digx[min],digz[min]-1,xdum, zdum); | |
295 | ||
296 | if (ndx == 1) { | |
297 | xcenter[i] = xdum; | |
298 | }else{ | |
299 | xcenter[i] = 0.; | |
300 | for (k=0;k<nd;k++) { | |
301 | GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum); | |
302 | xcenter[i] += (xdum / nd); | |
303 | } // end for k | |
304 | } // end if ndx | |
305 | ||
306 | if (ndz == 1) { | |
307 | zcenter[i] = zdum; | |
308 | } else { | |
309 | zcenter[i] = 0.; | |
310 | for (k=0;k<nd;k++) { | |
311 | GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum); | |
312 | zcenter[i] += (zdum / nd); | |
313 | } // end for k | |
314 | } // end if ndz | |
315 | ||
316 | // error on points in x and z directions | |
317 | ||
318 | if (ndx == 1) { | |
319 | errxcenter[i] = deltax / TMath::Sqrt(12.); | |
320 | } else { | |
321 | errxcenter[i] = 0.; | |
322 | for (k=0;k<nd;k++){ | |
323 | GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum); | |
324 | errxcenter[i] += ((xdum-xcenter[i])*(xdum-xcenter[i]))/ | |
325 | (nd*(nd-1)); | |
326 | } // end for k | |
327 | errxcenter[i] = TMath::Sqrt(errxcenter[i]); | |
328 | } // end if ndx | |
329 | if (ndz == 1) { | |
330 | deltaz = GetSeg()->Dpz(digz[min]); | |
331 | errzcenter[i] = deltaz / TMath::Sqrt(12.); | |
332 | } else { | |
333 | errzcenter[i] = 0.; | |
334 | for (k=0;k<nd;k++){ | |
335 | GetSeg()->GetPadCxz(xpad[k],zpad[k]-1,xdum,zdum); | |
336 | errzcenter[i] += ((zdum-zcenter[i])*(zdum-zcenter[i]))/ | |
337 | (nd*(nd-1)); | |
338 | } // end for k | |
339 | errzcenter[i] = TMath::Sqrt(errzcenter[i]); | |
340 | } // end if ndz | |
341 | // take three track numbers for the cluster | |
342 | // choose the track numbers of the digit with higher signal | |
343 | kmax = 0; | |
344 | sigmax = 0; | |
345 | for (k=0;k<nd;k++){ | |
346 | if(tr4pad[k] > sigmax){ | |
347 | sigmax = tr4pad[k]; | |
348 | kmax = k; | |
349 | } // end if tr4pad[k] | |
350 | } // end for k | |
351 | if(sigmax != 0) { | |
352 | tr1clus[i]= tr1pad[kmax]; | |
353 | tr2clus[i]= tr2pad[kmax]; | |
354 | tr3clus[i]= tr3pad[kmax]; | |
355 | } else { | |
356 | tr1clus[i]= -2; | |
357 | tr2clus[i]= -2; | |
358 | tr3clus[i]= -2; | |
359 | } // end if sigmax | |
360 | } else { | |
361 | // cluster with single digit | |
362 | ndig= 1.; | |
363 | ndx = 1; | |
364 | ndz = 1; | |
365 | GetSeg()->GetPadCxz(digx[min],digz[min]-1,xdum,zdum); | |
366 | xcenter[i] = xdum; | |
367 | zcenter[i] = zdum; | |
368 | tr1clus[i]=digtr1[min]; | |
369 | tr2clus[i]=digtr2[min]; | |
370 | tr3clus[i]=digtr3[min]; | |
371 | deltaz = GetSeg()->Dpz(digz[min]); | |
372 | errxcenter[i] = deltax / TMath::Sqrt(12.); | |
373 | errzcenter[i] = deltaz / TMath::Sqrt(12.); | |
374 | } // end if iclus[i] | |
9e1e0cd7 | 375 | |
aacedc3e | 376 | // store the cluster information to the AliITSRawCLusterSPD object |
04366a57 | 377 | |
9e1e0cd7 | 378 | |
aacedc3e | 379 | //put the cluster center in local reference frame of the detector |
380 | // and in microns | |
381 | xcenter[i] = xcenter[i] - GetSeg()->Dx()/2.; | |
382 | zcenter[i] = zcenter[i] - GetSeg()->Dz()/2.; | |
9e1e0cd7 | 383 | |
aacedc3e | 384 | AliITSRawClusterSPD *clust = new AliITSRawClusterSPD(zcenter[i], //f |
385 | xcenter[i], //f | |
386 | ndig, //f | |
387 | ndz,ndx, //ii | |
388 | ndxmin,ndxmax,//ii | |
389 | (Double_t) ndzmin, | |
390 | (Double_t) ndzmax, | |
391 | 0,GetModule()); | |
04366a57 | 392 | fITS->AddCluster(0,clust); |
aacedc3e | 393 | delete clust; |
9e1e0cd7 | 394 | }//end loop on clusters |
395 | delete[] ifpad; | |
396 | delete[] xpad ; | |
397 | delete[] zpad ; | |
398 | delete[] iclus; | |
399 | delete[] tr1pad; | |
400 | delete[] tr2pad; | |
401 | delete[] tr3pad; | |
402 | delete[] tr4pad; | |
c98c0281 | 403 | } |
9e1e0cd7 | 404 | //______________________________________________________---------------- |
c98c0281 | 405 | void AliITSClusterFinderSPD::DigitToPoint(Int_t nclus, |
aacedc3e | 406 | Double_t *xcenter,Double_t *zcenter, |
407 | Double_t *errxcenter, | |
408 | Double_t *errzcenter, | |
9e1e0cd7 | 409 | Int_t *tr1clus, Int_t *tr2clus, |
410 | Int_t *tr3clus){ | |
411 | // A point is associated to each cluster of SPD digits. The points | |
412 | // and their associated errors are stored in the file galiceSP.root. | |
aacedc3e | 413 | Double_t l[3],xg,zg; |
414 | const Double_t kconv = 1.0e-4; // micron -> cm | |
9e1e0cd7 | 415 | |
416 | // get rec points | |
9e1e0cd7 | 417 | for (Int_t i=0; i<nclus; i++){ |
c98c0281 | 418 | l[0] = kconv*xcenter[i]; |
aacedc3e | 419 | l[1] = kconv*GetSeg()->Dy()/2.; |
c98c0281 | 420 | l[2] = kconv*zcenter[i]; |
421 | ||
422 | xg = l[0]; | |
423 | zg = l[2]; | |
424 | ||
aacedc3e | 425 | Double_t sigma2x = (kconv*errxcenter[i]) * (kconv*errxcenter[i]); |
426 | Double_t sigma2z = (kconv*errzcenter[i]) * (kconv*errzcenter[i]); | |
c98c0281 | 427 | AliITSRecPoint rnew; |
428 | rnew.SetX(xg); | |
429 | rnew.SetZ(zg); | |
430 | rnew.SetQ(1.); | |
431 | rnew.SetdEdX(0.); | |
432 | rnew.SetSigmaX2(sigma2x); | |
433 | rnew.SetSigmaZ2(sigma2z); | |
434 | rnew.fTracks[0]=tr1clus[i]; | |
435 | rnew.fTracks[1]=tr2clus[i]; | |
436 | rnew.fTracks[2]=tr3clus[i]; | |
04366a57 | 437 | fITS->AddRecPoint(rnew); |
9e1e0cd7 | 438 | } // end for i |
c98c0281 | 439 | } |