1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////
19 // ITS geometry manipulation routines. //
20 // Created April 15 1999. //
22 // By: Bjorn S. Nilsen //
24 // Updated May 27 1999. //
25 // Added Cylindrical random and global based changes. //
26 // Added function PrintComparison. //
27 // Modified and added functions Feb. 7 2006 //
28 ///////////////////////////////////////////////////////////////////////
31 ////////////////////////////////////////////////////////////////////////
32 // The local coordinate system by, default, is show in the following
33 // figures. Also shown are the ladder numbering scheme.
36 <img src="picts/ITS/AliITSgeomMatrix_L1.gif">
39 <font size=+2 color=blue>
40 <p>This shows the relative geometry differences between the ALICE Global
41 coordinate system and the local detector coordinate system.
46 <img src="picts/ITS/its1+2_convention_front_5.gif">
49 <font size=+2 color=blue>
50 <p>This shows the front view of the SPDs and the orientation of the local
51 pixel coordinate system. Note that the inner pixel layer has its y coordinate
52 in the opposite direction from all of the other layers.
57 <img src="picts/ITS/its3+4_convention_front_5.gif">
60 <font size=+2 color=blue>
61 <p>This shows the front view of the SDDs and the orientation of the local
62 pixel coordinate system.
67 <img src="picts/ITS/its5+6_convention_front_5.gif">
70 <font size=+2 color=blue>
71 <p>This shows the front view of the SSDs and the orientation of the local
72 pixel coordinate system.
78 ////////////////////////////////////////////////////////////////////////
80 ////////////////////////////////////////////////////////////////////////
83 // Written by Bjorn S. Nilsen
88 // Transformation version.
90 // Flag to keep track of which transformation
92 // The total number of modules
94 // The number of ITS layers for this geometry. By default this
95 // is 6, but can be modified by the creator function if there are
96 // more layers defined.
99 // A pointer to an array fNlayers long containing the number of
100 // ladders for each layer. This array is typically created and filled
101 // by the AliITSgeom creator function.
104 // A pointer to an array fNlayers long containing the number of
105 // active detector volumes for each ladder. This array is typically
106 // created and filled by the AliITSgeom creator function.
108 // TObjArray fGm containing objects of type AliITSgeomMatrix
109 // A pointer to an array of AliITSgeomMatrix classes. One element
110 // per module (detector) in the ITS. AliITSgeomMatrix basicly contains
111 // all of the necessary information about the detector and it's coordinate
114 // TObjArray fShape containting objects of type AliITSgeom
115 // A pointer to an array of TObjects containing the detailed shape
116 // information for each type of detector used in the ITS. For example
117 // I have created AliITSgeomSPD, AliITSgeomSDD, and
118 // AliITSsegmenttionSSD as example structures, derived from TObjects,
119 // to hold the detector information. I would recommend that one element
120 // in each of these structures, that which describes the shape of the
121 // active volume, be one of the ROOT classes derived from TShape. In this
122 // way it would be easy to have the display program display the correct
123 // active ITS volumes. See the example classes AliITSgeomSPD,
124 // AliITSgeomSDD, and AliITSgeomSSD for a more detailed
126 ////////////////////////////////////////////////////////////////////////
127 #include <Riostream.h>
134 #include "AliITSgeomSPD.h"
135 #include "AliITSgeomSDD.h"
136 #include "AliITSgeomSSD.h"
137 #include "AliITSgeom.h"
142 //______________________________________________________________________
143 AliITSgeom::AliITSgeom():
145 fVersion("GEANT"),// Transformation version.
146 fTrans(0), // Flag to keep track of which transformation
147 fNmodules(0), // The total number of modules
148 fNlayers(0), // The number of layers.
149 fNlad(), //[] Array of the number of ladders/layer(layer)
150 fNdet(), //[] Array of the number of detector/ladder(layer)
151 fGm(0,0), // Structure of translation. and rotation.
152 fShape(0,0) // Array of shapes and detector information.
154 // The default constructor for the AliITSgeom class. It, by default,
155 // sets fNlayers to zero and zeros all pointers.
156 // Do not allocate anything zero everything.
162 // a zeroed AliITSgeom object.
165 fShape.SetOwner(kTRUE);
169 //______________________________________________________________________
170 AliITSgeom::AliITSgeom(Int_t itype,Int_t nlayers,const Int_t *nlads,
171 const Int_t *ndets,Int_t mods):
173 fVersion("GEANT"), // Transformation version.
174 fTrans(itype), // Flag to keep track of which transformation
175 fNmodules(mods), // The total number of modules
176 fNlayers(nlayers), // The number of layers.
177 fNlad(nlayers,nlads),//[] Array of the number of ladders/layer(layer)
178 fNdet(nlayers,ndets),//[] Array of the number of detector/ladder(layer)
179 fGm(mods,0), // Structure of translation. and rotation.
180 fShape(5,0) // Array of shapes and detector information.
182 // A simple constructor to set basic geometry class variables
184 // Int_t itype the type of transformation kept.
185 // bit 0 => Standard GEANT
186 // bit 1 => ITS tracking
187 // bit 2 => A change in the coordinate system
188 // has been made. others are still to be defined
190 // Int_t nlayers The number of ITS layers also set the size of
192 // Int_t *nlads an array of the number of ladders for each
193 // layer. This array must be nlayers long.
194 // Int_t *ndets an array of the number of detectors per ladder
195 // for each layer. This array must be nlayers long.
196 // Int_t mods The number of modules. Typically the sum of all the
197 // detectors on every layer and ladder.
201 // A properly inilized AliITSgeom object.
204 fShape.SetOwner(kTRUE);
207 //______________________________________________________________________
208 void AliITSgeom::Init(Int_t itype,Int_t nlayers,const Int_t *nlads,
209 const Int_t *ndets,Int_t mods){
210 // A simple Inilizer to set basic geometry class variables
212 // Int_t itype the type of transformation kept.
213 // bit 0 => Standard GEANT
214 // bit 1 => ITS tracking
215 // bit 2 => A change in the coordinate system
216 // has been made. others are still to be defined
218 // Int_t nlayers The number of ITS layers also set the size of
220 // Int_t *nlads an array of the number of ladders for each
221 // layer. This array must be nlayers long.
222 // Int_t *ndets an array of the number of detectors per ladder
223 // for each layer. This array must be nlayers long.
224 // Int_t mods The number of modules. Typically the sum of all the
225 // detectors on every layer and ladder.
229 // A properly inilized AliITSgeom object.
231 fVersion = "GEANT"; // Transformation version.
232 fTrans = itype; // Flag to keep track of which transformation
233 fNmodules = mods; // The total number of modules
234 fNlayers = nlayers; // The number of layers.
235 fNlad.Set(nlayers,nlads);//[] Array of the number of ladders/layer(layer)
236 fNdet.Set(nlayers,ndets);//[] Array of the number of detector/ladder(layer)
238 fGm.Expand(mods); // Structure of translation. and rotation.
241 fShape.Expand(5); // Array of shapes and detector information.
242 fShape.SetOwner(kTRUE);
245 //______________________________________________________________________
246 void AliITSgeom::CreateMatrix(Int_t mod,Int_t lay,Int_t lad,Int_t det,
247 AliITSDetector idet,const Double_t tran[3],
248 const Double_t rot[10]){
249 // Given the translation vector tran[3] and the rotation matrix rot[1],
250 // this function creates and adds to the TObject Array fGm the
251 // AliITSgeomMatrix object.
252 // The rot[10] matrix is set up like:
253 /* / rot[0] rot[1] rot[2] \
254 // | rot[3] rot[4] rot[5] |
255 // \ rot[6] rot[7] rot[8] / if(rot[9]!=0) then the Identity matrix
256 // is used regardless of the values in rot[0]-rot[8].
259 // Int_t mod The module number. The location in TObjArray
260 // Int_t lay The layer where this module is
261 // Int_t lad On which ladder this module is
262 // Int_t det Which detector on this ladder this module is
263 // AliITSDetector idet The type of detector see AliITSgeom.h
264 // Double_t tran[3] The translation vector
265 // Double_t rot[10] The rotation matrix.
271 Double_t r[3][3] = {{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0}};
273 if(mod<0||mod>=fGm.GetSize()){
274 Error("CreateMatrix","mod=%d is out of bounds max value=%d",mod,
279 id[0] = lay; id[1] = lad; id[2] = det;
280 if(rot[9]!=0.0) { // null rotation
281 r[0][0] = rot[0]; r[0][1] = rot[1]; r[0][2] = rot[2];
282 r[1][0] = rot[3]; r[1][1] = rot[4]; r[1][2] = rot[5];
283 r[2][0] = rot[6]; r[2][1] = rot[7]; r[2][2] = rot[8];
285 fGm.AddAt(new AliITSgeomMatrix(idet,id,r,tran),mod);
287 //______________________________________________________________________
288 AliITSgeom::~AliITSgeom(){
289 // The destructor for the AliITSgeom class. If the arrays fNlad,
290 // fNdet, or fGm have had memory allocated to them, there pointer values
291 // are non zero, then this memory space is freed and they are set
292 // to zero. In addition, fNlayers is set to zero. The destruction of
293 // TObjArray fShape is, by default, handled by the TObjArray destructor.
303 //______________________________________________________________________
304 void AliITSgeom::ReadNewFile(const char *filename){
305 // It is generally preferred to define the geometry in AliITSgeom
306 // directly from the GEANT geometry, see AliITSvPPRasymm.cxx for
307 // and example. Under some circumstances this may not be possible.
308 // This function will read in a formatted file for all of the
309 // information needed to define the geometry in AliITSgeom.
310 // Unlike the older file format, this file may contain comments
311 // and the order of the data does not need to be completely
312 // respected. A file can be created using the function WriteNewFile
315 // const char *filename The file name of the file to be read in.
321 const char *cmda[]={"Version" ,"fTrans" ,"fNmodules",
322 "fNlayers" ,"fNladers","fNdetectors",
323 "fNDetectorTypes","fShape" ,"Matrix"};
324 Int_t i,j,lNdetTypes,ldet;
326 AliITSgeomMatrix *m=0;
329 Bool_t arrayGm = kFALSE, arrayShape = kFALSE;
331 filtmp = gSystem->ExpandPathName(filename);
332 AliInfo(Form("Reading New .det file %s",filtmp));
333 fp = new ifstream(filtmp,ios::in); // open file to write
334 while(fp->get(c)!=NULL){ // for ever loop
335 if(c==' ') continue; // remove blanks
336 if(c=='\n') continue;
337 if(c=='#' || c=='!') {while(fp->get(c)) if(c=='\n') break; continue;}
340 if(c=='/') {while(fp->get(c)) if(c=='\n') break; continue;}
343 while(fp->get(c)) if(c=='*') break;
353 for(i=0;i<ncmd;i++) if(strcmp(cmd,cmda[i])==0) break;
356 while(isspace(fp->peek())) fp->get(); // skip spaces
357 if(isdigit(fp->peek())){ // new TString
360 for(j=0;j<fVersion.Length();j++) *fp >> fVersion[j];
363 for(j=0;isprint(fp->peek())&&j<20;j++) *fp >> fVersion[j];
372 fGm.Expand(fNmodules);
382 for(j=0;j<fNlayers;j++) *fp >> fNlad[j];
384 case 5: // fNdetectors
385 for(j=0;j<fNlayers;j++) *fp >> fNdet[j];
387 case 6: // fNDetectorTypes
390 fShape.Expand(lNdetTypes);
391 fShape.SetOwner(kTRUE);
396 if(!arrayShape) fShape.Expand(5);
397 fShape.SetOwner(kTRUE);
400 AliITSgeomSPD *spd = new AliITSgeomSPD();
402 ReSetShape(ldet,spd);
404 case kSDD : case kSDDp:{
405 AliITSgeomSDD *sdd = new AliITSgeomSDD();
407 ReSetShape(ldet,sdd);
409 case kSSD : case kSSDp :{
410 AliITSgeomSSD *ssd = new AliITSgeomSSD();
412 ReSetShape(ldet,ssd);
415 AliError(Form("Unknown fShape type number=%d c=%c",ldet,c));
416 while(fp->get(c)) if(c=='\n') break; // skip to end of line.
427 if(ldet<0||ldet>=fGm.GetSize()){
428 Error("ReadNewFile","ldet<0||ldet>=fGm.GetSize()=%d",
433 fGm.AddAt((TObject*)new AliITSgeomMatrix(),ldet);
434 m = (AliITSgeomMatrix*) fGm.At(ldet);
439 AliError(Form("ReadNewFile","Data line i=%d c=%c",i,c));
440 while(fp->get(c)) if(c=='\n') break; // skip this line
448 //______________________________________________________________________
449 void AliITSgeom::WriteNewFile(const char *filename)const{
450 // Writes AliITSgeom, AliITSgeomMatrix, and the defined
451 // AliITSgeomS*D classes to a file in a format that
452 // is more readable and commendable.
454 // const char *filename The file name of the file to be write to.
463 filtmp = gSystem->ExpandPathName(filename);
464 fp = new ofstream(filtmp,ios::out); // open file to write
465 *fp << "//Comment lines begin with two //, one #, or one !" << endl;
466 *fp << "#Blank lines are skipped including /* and */ sections." << endl;
467 *fp << "!and, in principle the order of the lines is not important" <<endl;
468 *fp << "/* In AliITSgeom.h are defined an enumerated type called" << endl;
469 *fp << " AliITSDetectors These are kSPD=" << (Int_t) kSPD ;
470 *fp << ", kSDD=" << (Int_t) kSDD << ", kSSD=" << (Int_t) kSSD;
471 *fp << ", kSSDp=" << (Int_t) kSSDp << ", and kSDDp=" << (Int_t) kSDDp;
473 *fp << "Version "<< fVersion.Length()<<" " << fVersion.Data() << endl;//
474 // This should be consistent
475 // with the geometry version.
476 *fp << "fTrans " << fTrans << endl;
477 *fp << "fNmodules " << fNmodules << endl;
478 *fp << "fNlayers " << fNlayers << endl;
480 for(i=0;i<fNlayers;i++) *fp << fNlad[i] << " ";
482 *fp << "fNdetectors ";
483 for(i=0;i<fNlayers;i++) *fp << fNdet[i] << " ";
485 *fp << "fNDetectorTypes " << fShape.GetEntriesFast() << endl;
486 for(i=0;i<fShape.GetEntriesFast();i++){
487 if(!IsShapeDefined(i)) continue; // only print out used shapes.
490 *fp << "fShape " << (Int_t) kSPD << " ";
491 *fp << *((AliITSgeomSPD*)(fShape.At(i)));
494 *fp << "fShape " << (Int_t) kSDD << " ";
495 *fp << *((AliITSgeomSDD*)(fShape.At(i)));
497 case kSSD : case kSSDp :
498 *fp << "fShape " << i << " ";
499 *fp << *((AliITSgeomSSD*)(fShape.At(i)));
502 Error("AliITSgeom::WriteNewFile","Unknown Shape value");
505 for(i=0;i<fNmodules;i++){
506 *fp << "Matrix " << i << " ";
507 *fp << *GetGeomMatrix(i);
509 *fp << "//End of File" << endl;;
514 //______________________________________________________________________
515 AliITSgeom::AliITSgeom(const char *filename):
517 fVersion("test"),// Transformation version.
518 fTrans(0), // Flag to keep track of which transformation
519 fNmodules(0), // The total number of modules
520 fNlayers(0), // The number of layers.
521 fNlad(), // TArrayI of the number of ladders/layer(layer)
522 fNdet(), // TArrayI of the number of detector/ladder(layer)
523 fGm(0,0), // TObjArray Structure of translation. and rotation.
524 fShape(0,0) // TObjArray of detector geom.
526 // The constructor for the AliITSgeom class. All of the data to fill
527 // this structure is read in from the file given my the input filename.
529 // const char *filename The file name of the file to be read in.
533 // An AliITSgeom class initialized from a file.
537 Float_t x,y,z,o,p,q,r,s,t;
538 Double_t rot6[6],tran[3];
539 char buf[200],*buff=0; // input character buffer;
542 filtmp = gSystem->ExpandPathName(filename);
543 Info("AliITSgeom","reading old .det file %s",filtmp);
545 pf = fopen(filtmp,"r");
547 fNlayers = 6; // set default number of ladders
552 // find the number of ladders and detectors in this geometry.
553 for(i=0;i<fNlayers;i++){fNlad[i]=fNdet[i]=0;} // zero out arrays
554 while(fgets(buf,200,pf)!=NULL){ // for ever loop
555 for(i=0;i<200;i++)if(buf[i]!=' '){ // remove blank spaces.
559 // remove blank lines and comments.
560 if(buff[0]=='\n'||buff[0]=='#'||buff[0]=='!'||
561 (buff[0]=='/'&&buff[1]=='/')) continue;
562 if(isalpha(buff[0])) { // must be the new file formated file.
564 ReadNewFile(filename);
566 } // end if isalpha(buff[0])
567 sscanf(buff,"%d %d %d %f %f %f %f %f %f %f %f %f",
568 &l,&a,&d,&x,&y,&z,&o,&p,&q,&r,&s,&t);
570 if(l<1 || l>fNlayers) {
571 printf("error in file %s layer=%d min. is 1 max is %d"
572 " Trying new format\n",filename,l,fNlayers);
574 ReadNewFile(filename);
579 if(l<=fNlayers&&fNlad[l-1]<a) fNlad[l-1] = a;
580 if(l<=fNlayers&&fNdet[l-1]<d) fNdet[l-1] = d;
581 } // end while ever loop
585 } // end if lm>fNlayers
586 // counted the number of ladders and detectors now allocate space.
587 fGm.Expand(fNmodules);
589 fShape.SetOwner(kTRUE);
591 // Set up Shapes for a default configuration of 6 layers.
592 fTrans = 0; // standard GEANT global/local coordinate system.
593 // prepare to read in transforms
594 lm = 0; // reuse lm as counter of modules.
595 rewind(pf); // start over reading file
596 while(fgets(buf,200,pf)!=NULL){ // for ever loop
597 for(i=0;i<200;i++)if(buf[i]!=' '){ // remove blank spaces.
601 // remove blank lines and comments.
602 if(buff[0]=='\n'||buff[0]=='#'||buff[0]=='!'||
603 (buff[0]=='/'&&buff[1]=='/')) continue;
604 x = y = z = o = p = q = r = s = t = 0.0;
605 sscanf(buff,"%d %d %d %f %f %f %f %f %f %f %f %f",
606 &l,&a,&d,&x,&y,&z,&o,&p,&q,&r,&s,&t);
607 if(l<1 || l>fNlayers) {
608 Warning("AliITSgeom","error in file %s layer=%d"
609 " min. is 1 max is %d",filename,l,fNlayers);
612 id[0] = l;id[1] = a;id[2] = d;
613 tran[0] = tran[1] = tran[2] = 0.0;
614 tran[0] = (Double_t)x;tran[1] = (Double_t)y;tran[2] = (Double_t)z;
615 rot6[0] = rot6[1] = rot6[2] = rot6[3] = rot6[4] = rot6[5] =0.0;
616 rot6[0] = (Double_t)o;rot6[1] = (Double_t)p;rot6[2] = (Double_t)q;
617 rot6[3] = (Double_t)r;rot6[4] = (Double_t)s;rot6[5] = (Double_t)t;
618 if(lm<0||lm>=fGm.GetSize()){
619 Error("AliITSgeom(filename)","lm<0||lm>=fGm.GetSize()=%d",
624 case 1: case 2: // layer 1 or2 SPD
625 fGm.AddAt(new AliITSgeomMatrix(rot6,kSPD,id,tran),lm++);
627 case 3: case 4: // layer 3 or 4 SDD
628 fGm.AddAt(new AliITSgeomMatrix(rot6,kSDD,id,tran),lm++);
630 case 5: case 6: // layer 5 or 6 SSD
631 fGm.AddAt(new AliITSgeomMatrix(rot6,kSSD,id,tran),lm++);
634 } // end while ever loop
637 //______________________________________________________________________
638 AliITSgeom::AliITSgeom(const AliITSgeom &source) :
640 fVersion(source.fVersion), // Transformation version.
641 fTrans(source.fTrans), // Flag to keep track of which transformation
642 fNmodules(source.fNmodules),// The total number of modules
643 fNlayers(source.fNlayers), // The number of layers.
644 fNlad(source.fNlad), // Array of the number of ladders/layer(layer)
645 fNdet(source.fNdet), // Array of the number of detector/ladder(layer)
646 fGm(source.fGm.GetSize(),source.fGm.LowerBound()),// Structure of
647 // translation and rotation.
648 fShape(source.fShape.GetSize(),source.fShape.LowerBound())// Array of shapes
649 // and detector information.
651 // The copy constructor for the AliITSgeom class. It calls the
652 // = operator function. See the = operator function for more details.
654 // AliITSgeom &source The AliITSgeom class with which to make this
662 n = source.fGm.GetLast()+1;
663 for(i=source.fGm.LowerBound();i<n;i++){
664 fGm.AddAt(new AliITSgeomMatrix(*((AliITSgeomMatrix*)(
665 source.fGm.At(i)))),i);
668 n = source.fShape.GetLast()+1;
669 for(i=source.fShape.LowerBound();i<n;i++){
670 switch ((AliITSDetector)i){
672 fShape.AddAt(new AliITSgeomSPD(*((AliITSgeomSPD*)(
673 source.fShape.At(i)))),i);
675 case kSDD : case kSDDp:{
676 fShape.AddAt(new AliITSgeomSDD(*((AliITSgeomSDD*)(
677 source.fShape.At(i)))),i);
679 case kSSD : case kSSDp :{
680 fShape.AddAt(new AliITSgeomSSD(*((AliITSgeomSSD*)(
681 source.fShape.At(i)))),i);
684 AliError(Form("Unknown fShape type number=%d",i));
688 fShape.SetOwner(kTRUE);
691 //______________________________________________________________________
692 AliITSgeom& AliITSgeom::operator=(const AliITSgeom &source){
693 // The = operator function for the AliITSgeom class. It makes an
694 // independent copy of the class in such a way that any changes made
695 // to the copied class will not affect the source class in any way.
696 // This is required for many ITS alignment studies where the copied
697 // class is then modified by introducing some misalignment.
699 // AliITSgeom &source The AliITSgeom class with which to make this
704 // *this The a new copy of source.
707 if(this == &source) return *this; // don't assign to ones self.
709 // if there is an old structure allocated delete it first.
711 this->fShape.Clear();
713 this->fVersion = source.fVersion;
714 this->fTrans = source.fTrans;
715 this->fNmodules = source.fNmodules;
716 this->fNlayers = source.fNlayers;
717 this->fNlad = source.fNlad;
718 this->fNdet = source.fNdet;
719 this->fGm.Expand(this->fNmodules);
720 for(i=source.fGm.LowerBound();i<source.fGm.GetLast();i++){
721 fGm.AddAt(new AliITSgeomMatrix(*((AliITSgeomMatrix*)(
722 source.fGm.At(i)))),i);
725 this->fShape.Expand(source.fShape.GetEntriesFast());
726 for(i=source.fShape.LowerBound();i<source.fShape.GetLast();i++){
727 switch ((AliITSDetector)i){
729 fShape.AddAt(new AliITSgeomSPD(*((AliITSgeomSPD*)(
730 source.fShape.At(i)))),i);
732 case kSDD : case kSDDp:{
733 fShape.AddAt(new AliITSgeomSDD(*((AliITSgeomSDD*)(
734 source.fShape.At(i)))),i);
736 case kSSD : case kSSDp :{
737 fShape.AddAt(new AliITSgeomSSD(*((AliITSgeomSSD*)(
738 source.fShape.At(i)))),i);
741 AliError(Form("Unknown fShape type number=%d",i));
745 fShape.SetOwner(kTRUE);
748 //______________________________________________________________________
749 Int_t AliITSgeom::GetModuleIndex(Int_t lay,Int_t lad,Int_t det)const{
750 // This routine computes the module index number from the layer,
751 // ladder, and detector numbers. The number of ladders and detectors
752 // per layer is determined when this geometry package is constructed,
753 // see AliITSgeom(const char *filename) for specifics.
755 // Int_t lay The layer number. Starting from 1.
756 // Int_t lad The ladder number. Starting from 1.
757 // Int_t det The detector number. Starting from 1.
761 // the module index number, starting from zero.
764 i = fNdet[lay-1] * (lad-1) + det - 1;
766 for(k=0;k<lay-1;k++) j += fNdet[k]*fNlad[k];
768 if(i>=fNmodules) return -1;
769 GetGeomMatrix(i)->GetIndex(id);
770 if(id[0]==lay&&id[1]==lad&&id[2]==det) return i;
771 // Array of modules fGm is not in expected order. Search for this index
772 for(i=0;i<fNmodules;i++){
773 GetGeomMatrix(i)->GetIndex(id);
774 if(id[0]==lay&&id[1]==lad&&id[2]==det) return i;
776 // This layer ladder and detector combination does not exist return -1.
779 //______________________________________________________________________
780 void AliITSgeom::GetModuleId(Int_t index,Int_t &lay,Int_t &lad,Int_t &det)
782 // This routine computes the layer, ladder and detector number
783 // given the module index number. The number of ladders and detectors
784 // per layer is determined when this geometry package is constructed,
785 // see AliITSgeom(const char *filename) for specifics.
787 // Int_t index The module index number, starting from zero.
789 // Int_t lay The layer number. Starting from 1.
790 // Int_t lad The ladder number. Starting from 1.
791 // Int_t det The detector number. Starting from 1.
795 AliITSgeomMatrix *g = GetGeomMatrix(index);
798 Error("GetModuleId","Can not get GeoMatrix for index = %d",index);
799 lay = -1; lad = -1; det = -1;
802 lay = id[0]; lad = id[1]; det = id[2];
805 // The old way kept for posterity.
809 for(k=0;k<fNlayers;k++){
810 j += fNdet[k]*fNlad[k];
814 i = index -j + fNdet[k]*fNlad[k];
816 for(k=0;k<fNlad[lay-1];k++){
821 det = 1+i-fNdet[lay-1]*k;
825 //______________________________________________________________________
826 Int_t AliITSgeom::GetNDetTypes(Int_t &max)const{
827 // Finds and returns the number of detector types used and the
828 // maximum detector type value. Only counts id >=0 (no undefined
829 // values. See AliITSgeom.h for list of AliITSDetecor enumerated types.
833 // The maximum detector type used
835 // The number of detector types used
839 for(i=0;i<GetIndexMax();i++){
840 id = GetModuleType(i);
843 n = new Int_t[max+1];
844 for(i=0;i<max;i++) n[i] = 0;
845 for(i=0;i<GetIndexMax();i++){
846 id = GetModuleType(i);
847 if(id>-1)n[id]++; // note id=-1 => undefined.
850 for(i=0;i<max;i++) if(n[i]!=0) id++;
854 //______________________________________________________________________
855 Int_t AliITSgeom::GetNDetTypes(TArrayI &maxs,AliITSDetector *types)const{
856 // Finds and returns the number of detector types used and the
857 // number of each detector type. Only counts id >=0 (no undefined
858 // values. See AliITSgeom.h for list of AliITSDetecor enumerated types.
862 // The maximum detector type used
864 // The number of detector types used
868 for(i=0;i<GetIndexMax();i++){
869 id = GetModuleType(i);
872 n = new Int_t[max+1];
873 for(i=0;i<max;i++) n[i] = 0;
874 for(i=0;i<GetIndexMax();i++){
875 id = GetModuleType(i);
876 if(id>-1)n[id]++; // note id=-1 => undefined.
879 for(i=0;i<=max;i++) if(n[i]!=0) id++;
882 for(i=0;i<=max;i++) if(n[i]!=0){
884 types[j++] = (AliITSDetector) i;
885 } // end for i/end if
889 //______________________________________________________________________
890 Int_t AliITSgeom::GetStartDet(Int_t dtype)const{
891 // returns the starting module index value for a give type of detector id.
892 // This assumes that the detector types are different on different layers
893 // and that they are not mixed up.
895 // Int_t dtype A detector type number. 0 for SPD, 1 for SDD,
900 // the module index for the first occurrence of that detector type.
904 return GetModuleIndex(1,1,1);
907 return GetModuleIndex(3,1,1);
910 return GetModuleIndex(5,1,1);
913 Warning("GetStartDet","undefined detector type %d",dtype);
917 Warning("GetStartDet","undefined detector type %d",dtype);
920 //______________________________________________________________________
921 Int_t AliITSgeom::GetLastDet(Int_t dtype)const{
922 // returns the last module index value for a give type of detector id.
923 // This assumes that the detector types are different on different layers
924 // and that they are not mixed up.
926 // Int_t dtype A detector type number. 0 for SPD, 1 for SDD,
930 // the module index for the last occurrence of that detector type.
932 switch((AliITSDetector)dtype){
934 return GetModuleIndex(3,1,1)-1;
937 return GetModuleIndex(5,1,1)-1;
940 return GetIndexMax()-1;
942 case kSSDp: case kSDDp: case kND:
944 Warning("GetLastDet","undefined detector type %d",dtype);
948 Warning("GetLastDet","undefined detector type %d",dtype);
951 //______________________________________________________________________
952 Bool_t AliITSgeom::IsInside(Int_t module,Double_t point[3])const{
953 // Determins if the give point is inside of the module as defined
954 // by this set of coordinate transforms.
956 // Int_t module The module to be checked
957 // Double_t point[3] A 3 vector global point
961 // kTRUE if point is inside of module, kFALSE otherwise.
962 Double_t l[3],dx,dy,dz;
963 AliITSDetector idet = (AliITSDetector)(this->GetGeomMatrix(module)->
966 this->GtoL(module,point,l);
969 AliITSgeomSPD *spd = (AliITSgeomSPD*)(fShape.At((Int_t)idet));
974 case kSDD: case kSDDp:{
975 AliITSgeomSDD *sdd = (AliITSgeomSDD*)(fShape.At((Int_t)idet));
980 case kSSD: case kSSDp:{
981 AliITSgeomSSD *ssd = (AliITSgeomSSD*)(fShape.At((Int_t)idet));
986 default: // Detector not defined.
990 if(TMath::Abs(l[0])>dx) return kFALSE;
991 if(TMath::Abs(l[2])>dz) return kFALSE;
992 if(TMath::Abs(l[1])>dy) return kFALSE;
995 //______________________________________________________________________
996 void AliITSgeom::PrintComparison(FILE *fp,AliITSgeom *other)const{
997 // This function was primarily created for diagnostic reasons. It
998 // print to a file pointed to by the file pointer fp the difference
999 // between two AliITSgeom classes. The format of the file is basically,
1000 // define d? to be the difference between the same element of the two
1001 // classes. For example dfrx = this->GetGeomMatrix(i)->frx
1002 // - other->GetGeomMatrix(i)->frx.
1003 // if(at least one of dfx0, dfy0, dfz0,dfrx,dfry,dfrz are non zero) then
1004 // print layer ladder detector dfx0 dfy0 dfz0 dfrx dfry dfrz
1005 // if(at least one of the 9 elements of dfr[] are non zero) then print
1006 // layer ladder detector dfr[0] dfr[1] dfr[2]
1007 // dfr[3] dfr[4] dfr[5]
1008 // dfr[6] dfr[7] dfr[8]
1009 // Only non zero values are printed to save space. The differences are
1010 // typical written to a file because there are usually a lot of numbers
1011 // printed out and it is usually easier to read them in some nice editor
1012 // rather than zooming quickly past you on a screen. fprintf is used to
1013 // do the printing. The fShapeIndex difference is not printed at this time.
1015 // FILE *fp A file pointer to an opened file for writing
1016 // in which the results of the comparison will
1018 // AliITSgeom *other The other AliITSgeom class to which this one is
1024 Int_t i,j,idt[3],ido[3];
1025 Double_t tt[3],to[3]; // translation
1026 Double_t rt[3],ro[3]; // phi in radians
1027 Double_t mt[3][3],mo[3][3]; // matrices
1028 AliITSgeomMatrix *gt,*go;
1031 for(i=0;i<this->fNmodules;i++){
1032 gt = this->GetGeomMatrix(i);
1033 go = other->GetGeomMatrix(i);
1037 for(i=0;i<3;i++) t = t&&idt[i]!=ido[i];
1038 if(t) fprintf(fp,"%4.4d %1.1d %2.2d %2.2d %1.1d %2.2d %2.2d\n",i,
1039 idt[0],idt[1],idt[2],ido[0],ido[1],ido[2]);
1040 gt->GetTranslation(tt);
1041 go->GetTranslation(to);
1045 for(i=0;i<3;i++) t = t&&tt[i]!=to[i];
1046 if(t) fprintf(fp,"%1.1d %2.2d %2.2d dTrans=%f %f %f drot=%f %f %f\n",
1047 idt[0],idt[1],idt[2],
1048 tt[0]-to[0],tt[1]-to[1],tt[2]-to[2],
1049 rt[0]-ro[0],rt[1]-ro[1],rt[2]-ro[2]);
1053 for(i=0;i<3;i++)for(j=0;j<3;j++) t = mt[i][j] != mo[i][j];
1055 fprintf(fp,"%1.1d %2.2d %2.2d dfr= %e %e %e\n",
1056 idt[0],idt[1],idt[2],
1057 mt[0][0]-mo[0][0],mt[0][1]-mo[0][1],mt[0][2]-mo[0][2]);
1058 fprintf(fp," dfr= %e %e %e\n",
1059 mt[1][0]-mo[1][0],mt[1][1]-mo[1][1],mt[1][2]-mo[1][2]);
1060 fprintf(fp," dfr= %e %e %e\n",
1061 mt[2][0]-mo[2][0],mt[2][1]-mo[2][1],mt[2][2]-mo[2][2]);
1066 //______________________________________________________________________
1067 void AliITSgeom::PrintData(FILE *fp,Int_t lay,Int_t lad,Int_t det)const{
1068 // This function prints out the coordinate transformations for
1069 // the particular detector defined by layer, ladder, and detector
1070 // to the file pointed to by the File pointer fp. fprintf statements
1071 // are used to print out the numbers. The format is
1072 // layer ladder detector Trans= fx0 fy0 fz0 rot= frx fry frz
1073 // Shape=fShapeIndex
1074 // dfr= fr[0] fr[1] fr[2]
1075 // dfr= fr[3] fr[4] fr[5]
1076 // dfr= fr[6] fr[7] fr[8]
1077 // By indicating which detector, some control over the information
1078 // is given to the user. The output it written to the file pointed
1079 // to by the file pointer fp. This can be set to stdout if you want.
1081 // FILE *fp A file pointer to an opened file for
1082 // writing in which the results of the
1083 // comparison will be written.
1084 // Int_t lay The layer number. Starting from 1.
1085 // Int_t lad The ladder number. Starting from 1.
1086 // Int_t det The detector number. Starting from 1.
1091 AliITSgeomMatrix *gt;
1092 Double_t t[3],r[3],m[3][3];
1094 gt = this->GetGeomMatrix(GetModuleIndex(lay,lad,det));
1095 gt->GetTranslation(t);
1097 fprintf(fp,"%1.1d %2.2d %2.2d Trans=%f %f %f rot=%f %f %f Shape=%d\n",
1098 lay,lad,det,t[0],t[1],t[2],r[0],r[1],r[2],
1099 gt->GetDetectorIndex());
1101 fprintf(fp," dfr= %e %e %e\n",m[0][0],m[0][1],m[0][2]);
1102 fprintf(fp," dfr= %e %e %e\n",m[1][0],m[1][1],m[1][2]);
1103 fprintf(fp," dfr= %e %e %e\n",m[2][0],m[2][1],m[2][2]);
1106 //______________________________________________________________________
1107 void AliITSgeom::PrintGeom(ostream *wb)const{
1108 // Stream out an object of class AliITSgeom to standard output.
1110 // ofstream *wb The output streaming buffer.
1117 wb->setf(ios::scientific);
1118 *wb << fTrans << " ";
1119 *wb << fNmodules << " ";
1120 *wb << fNlayers << " ";
1121 for(i=0;i<fNlayers;i++) *wb << fNlad[i] << " ";
1122 for(i=0;i<fNlayers;i++) *wb << fNdet[i] << "\n";
1123 for(i=0;i<fNmodules;i++) {
1124 *wb <<setprecision(16) << *(GetGeomMatrix(i)) << "\n";
1126 nshapes = fShape.GetEntries();
1127 *wb << nshapes <<endl;
1128 for(i=0;i<nshapes;i++) if(fShape.At(i)!=0) switch (i){
1130 *wb << kSPD <<","<< (AliITSgeomSPD*)(fShape.At(kSPD));
1133 *wb << kSDD <<","<< (AliITSgeomSDD*)(fShape.At(kSDD));
1136 *wb << kSSD <<","<< (AliITSgeomSSD*)(fShape.At(kSSD));
1139 *wb << kSSDp <<","<< (AliITSgeomSSD*)(fShape.At(kSSDp));
1142 *wb << kSDDp <<","<< (AliITSgeomSDD*)(fShape.At(kSDDp));
1144 } // end for i / switch
1147 //______________________________________________________________________
1148 void AliITSgeom::ReadGeom(istream *rb){
1149 // Stream in an object of class AliITSgeom from standard input.
1151 // ifstream *rb The input streaming buffer.
1160 *rb >> fTrans >> fNmodules >> fNlayers;
1161 fNlad.Set(fNlayers);
1162 fNdet.Set(fNlayers);
1163 for(i=0;i<fNlayers;i++) *rb >> fNlad[i];
1164 for(i=0;i<fNlayers;i++) *rb >> fNdet[i];
1165 fGm.Expand(fNmodules);
1166 fGm.SetOwner(kTRUE);
1167 for(i=0;i<fNmodules;i++){
1168 if(i<0||i>=fGm.GetSize()){
1169 Error("ReadGeom","i<0||i>=fGm.GetSize()=%d",
1173 fGm.AddAt(new AliITSgeomMatrix,i);
1174 *rb >> *(GetGeomMatrix(i));
1178 fShape.SetOwner(kTRUE);
1179 for(i=0;i<fShape.GetEntries();i++) {
1183 AliITSgeomSPD *s = new AliITSgeomSPD();
1185 fShape.AddAt(s,kSPD);}
1188 AliITSgeomSDD *s = new AliITSgeomSDD();
1190 fShape.AddAt(s,kSDD);}
1193 AliITSgeomSSD *s = new AliITSgeomSSD();
1195 fShape.AddAt(s,kSSD);}
1198 AliITSgeomSSD *s = new AliITSgeomSSD();
1200 fShape.AddAt(s,kSSDp);}
1203 AliITSgeomSDD *s = new AliITSgeomSDD();
1205 fShape.AddAt(s,kSDDp);}
1211 //______________________________________________________________________
1212 // The following routines modify the transformation of "this"
1213 // geometry transformations in a number of different ways.
1214 //______________________________________________________________________
1215 void AliITSgeom::GlobalChange(const Float_t *tran,const Float_t *rot){
1216 // This function performs a Cartesian translation and rotation of
1217 // the full ITS from its default position by an amount determined by
1218 // the three element arrays tran and rot. If every element
1219 // of tran and rot are zero then there is no change made
1220 // the geometry. The change is global in that the exact same translation
1221 // and rotation is done to every detector element in the exact same way.
1222 // The units of the translation are those of the Monte Carlo, usually cm,
1223 // and those of the rotation are in radians. The elements of tran
1224 // are tran[0] = x, tran[1] = y, and tran[2] = z.
1225 // The elements of rot are rot[0] = rx, rot[1] = ry, and
1226 // rot[2] = rz. A change in x will move the hole ITS in the ALICE
1227 // global x direction, the same for a change in y. A change in z will
1228 // result in a translation of the ITS as a hole up or down the beam line.
1229 // A change in the angles will result in the inclination of the ITS with
1230 // respect to the beam line, except for an effective rotation about the
1231 // beam axis which will just rotate the ITS as a hole about the beam axis.
1233 // Float_t *tran A 3 element array representing the global
1234 // translations. the elements are x,y,z in cm.
1235 // Float_t *rot A 3 element array representing the global rotation
1236 // angles about the three axis x,y,z in radians
1243 AliITSgeomMatrix *g;
1245 fTrans = (fTrans && 0xfffd) + 2; // set bit 1 true.
1246 for(i=0;i<fNmodules;i++){
1247 g = this->GetGeomMatrix(i);
1248 g->GetTranslation(t);
1254 g->SetTranslation(t);
1259 //______________________________________________________________________
1260 void AliITSgeom::GlobalCylindericalChange(const Float_t *tran,
1261 const Float_t *rot){
1262 // This function performs a cylindrical translation and rotation of
1263 // each ITS element by a fixed about in radius, rphi, and z from its
1264 // default position by an amount determined by the three element arrays
1265 // tran and rot. If every element of tran and
1266 // rot are zero then there is no change made the geometry. The
1267 // change is global in that the exact same distance change in translation
1268 // and rotation is done to every detector element in the exact same way.
1269 // The units of the translation are those of the Monte Carlo, usually cm,
1270 // and those of the rotation are in radians. The elements of tran
1271 // are tran[0] = r, tran[1] = rphi, and tran[2] = z.
1272 // The elements of rot are rot[0] = rx, rot[1] = ry, and
1273 // rot[2] = rz. A change in r will results in the increase of the
1274 // radius of each layer by the same about. A change in rphi will results in
1275 // the rotation of each layer by a different angle but by the same
1276 // circumferential distance. A change in z will result in a translation
1277 // of the ITS as a hole up or down the beam line. A change in the angles
1278 // will result in the inclination of the ITS with respect to the beam
1279 // line, except for an effective rotation about the beam axis which will
1280 // just rotate the ITS as a hole about the beam axis.
1282 // Float_t *tran A 3 element array representing the global
1283 // translations. the elements are r,theta,z in
1285 // Float_t *rot A 3 element array representing the global rotation
1286 // angles about the three axis x,y,z in radians
1292 Double_t t[3],ro[3],r,r0,phi,rphi;
1293 AliITSgeomMatrix *g;
1295 fTrans = (fTrans && 0xfffd) + 2; // set bit 1 true.
1296 for(i=0;i<fNmodules;i++){
1297 g = this->GetGeomMatrix(i);
1298 g->GetTranslation(t);
1300 r = r0= TMath::Hypot(t[1],t[0]);
1301 phi = TMath::ATan2(t[1],t[0]);
1306 t[0] = r*TMath::Cos(phi);
1307 t[1] = r*TMath::Sin(phi);
1312 g->SetTranslation(t);
1317 //______________________________________________________________________
1318 void AliITSgeom::RandomChange(const Float_t *stran,const Float_t *srot){
1319 // This function performs a Gaussian random displacement and/or
1320 // rotation about the present global position of each active
1321 // volume/detector of the ITS. The sigma of the random displacement
1322 // is determined by the three element array stran, for the
1323 // x y and z translations, and the three element array srot,
1324 // for the three rotation about the axis x y and z.
1326 // Float_t *stran A 3 element array representing the global
1327 // translations variances. The elements are x,
1329 // Float_t *srot A 3 element array representing the global rotation
1330 // angles variances about the three axis x,y,z in
1338 AliITSgeomMatrix *g;
1340 fTrans = (fTrans && 0xfffd) + 2; // set bit 1 true.
1341 for(i=0;i<fNmodules;i++){
1342 g = this->GetGeomMatrix(i);
1343 g->GetTranslation(t);
1346 t[j] += gRandom->Gaus(0.0,stran[j]);
1347 r[j] += gRandom->Gaus(0.0, srot[j]);
1349 g->SetTranslation(t);
1354 //______________________________________________________________________
1355 void AliITSgeom::RandomCylindericalChange(const Float_t *stran,
1356 const Float_t *srot){
1357 // This function performs a Gaussian random displacement and/or
1358 // rotation about the present global position of each active
1359 // volume/detector of the ITS. The sigma of the random displacement
1360 // is determined by the three element array stran, for the
1361 // r rphi and z translations, and the three element array srot,
1362 // for the three rotation about the axis x y and z. This random change
1363 // in detector position allow for the simulation of a random uncertainty
1364 // in the detector positions of the ITS.
1366 // Float_t *stran A 3 element array representing the global
1367 // translations variances. The elements are r,
1368 // theta,z in cm/radians.
1369 // Float_t *srot A 3 element array representing the global rotation
1370 // angles variances about the three axis x,y,z in
1377 Double_t t[3],ro[3],r,r0,phi,rphi;
1379 AliITSgeomMatrix *g;
1381 fTrans = (fTrans && 0xfffd) + 2; // set bit 1 true.
1382 for(i=0;i<fNmodules;i++){
1383 g = this->GetGeomMatrix(i);
1384 g->GetTranslation(t);
1386 r = r0= TMath::Hypot(t[1],t[0]);
1387 phi = TMath::ATan2(t[1],t[0]);
1389 r += ran.Gaus(0.0,stran[0]);
1390 rphi += ran.Gaus(0.0,stran[1]);
1392 t[0] = r*TMath::Cos(phi);
1393 t[1] = r*TMath::Sin(phi);
1394 t[2] += ran.Gaus(0.0,stran[2]);
1396 ro[j] += ran.Gaus(0.0, srot[j]);
1398 g->SetTranslation(t);
1403 //______________________________________________________________________
1404 void AliITSgeom::GeantToTracking(const AliITSgeom &source){
1405 // Copy the geometry data but change it to go between the ALICE
1406 // Global coordinate system to that used by the ITS tracking. A slightly
1407 // different coordinate system is used when tracking. This coordinate
1408 // system is only relevant when the geometry represents the cylindrical
1409 // ALICE ITS geometry. For tracking the Z axis is left alone but X-> -Y
1410 // and Y-> X such that X always points out of the ITS cylinder for every
1411 // layer including layer 1 (where the detectors are mounted upside down).
1414 <img src="picts/ITS/AliITSgeomMatrix_T1.gif">
1418 // AliITSgeom &source The AliITSgeom class with which to make this
1424 Int_t i,j,k,l,id[3];
1425 Double_t r0[3][3],r1[3][3];
1426 Double_t a0[3][3] = {{0.,+1.,0.},{-1.,0.,0.},{0.,0.,+1.}};
1427 Double_t a1[3][3] = {{0.,-1.,0.},{+1.,0.,0.},{0.,0.,+1.}};
1429 *this = source; // copy everything
1430 for(i=0;i<GetIndexMax();i++){
1431 GetGeomMatrix(i)->GetIndex(id);
1432 GetGeomMatrix(i)->GetMatrix(r0);
1433 if(id[0]==1){ // Layer 1 is treated different from the others.
1434 for(j=0;j<3;j++) for(k=0;k<3;k++){
1436 for(l=0;l<3;l++) r1[j][k] += a0[j][l]*r0[l][k];
1439 for(j=0;j<3;j++) for(k=0;k<3;k++){
1441 for(l=0;l<3;l++) r1[j][k] += a1[j][l]*r0[l][k];
1444 GetGeomMatrix(i)->SetMatrix(r1);
1446 this->fTrans = (this->fTrans && 0xfffe) + 1; // set bit 0 true.
1449 //______________________________________________________________________
1450 Int_t AliITSgeom::GetNearest(const Double_t g[3],Int_t lay)const{
1451 // Finds the Detector (Module) that is nearest the point g [cm] in
1452 // ALICE Global coordinates. If layer !=0 then the search is restricted
1453 // to Detectors (Modules) in that particular layer.
1455 // Double_t g[3] The ALICE Cartesian global coordinate from which the
1456 // distance is to be calculated with.
1457 // Int_t lay The layer to restrict the search to. If layer=0 then
1458 // all layers are searched. Default is lay=0.
1462 // The module number representing the nearest module.
1464 Double_t d,dn=1.0e10;
1465 Bool_t t=lay!=0; // skip if lay = 0 default value check all layers.
1467 for(i=0;i<fNmodules;i++){
1468 if(t){GetModuleId(i,l,a,e);if(l!=lay) continue;}
1469 if((d=GetGeomMatrix(i)->Distance2(g))<dn){
1476 //______________________________________________________________________
1477 void AliITSgeom::GetNearest27(const Double_t g[3],Int_t n[27],Int_t lay)const{
1478 // Finds 27 Detectors (Modules) that are nearest the point g [cm] in
1479 // ALICE Global coordinates. If layer !=0 then the search is restricted
1480 // to Detectors (Modules) in that particular layer. The number 27 comes
1481 // from including the nearest detector and all those around it (up, down,
1482 // left, right, forwards, backwards, and the corners).
1484 // Double_t g[3] The ALICE Cartesian global coordinate from which the
1485 // distance is to be calculated with.
1486 // Int_t lay The layer to restrict the search to. If layer=0 then
1487 // all layers are searched. Default is lay=0.
1489 // Int_t n[27] The module number representing the nearest 27 modules
1493 Int_t i,l,a,e,in[27]={0,0,0,0,0,0,0,0,0,
1495 0,0,0,0,0,0,0,0,0,};
1496 Double_t d,dn[27]={1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,
1497 1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,
1498 1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,
1499 1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,1.0e10,
1500 1.0e10,1.0e10,1.0e10};
1501 Bool_t t=(lay!=0); // skip if lay = 0 default value check all layers.
1503 for(i=0;i<fNmodules;i++){
1504 if(t){GetModuleId(i,l,a,e);if(l!=lay) continue;}
1506 d = GetGeomMatrix(i)->Distance2(g);
1508 for(e=26;e>a;e--){dn[e] = dn[e-1];in[e] = in[e-1];}
1509 dn[a] = d; in[a] = i;
1513 for(i=0;i<27;i++) n[i] = in[i];
1515 //----------------------------------------------------------------------
1516 Double_t AliITSgeom::GetAverageRadiusOfLayer(Int_t layer,Double_t &range)const{
1517 // Loops over all modules for a given layer and computes the
1518 // average cylindrical radius (about the z axis) and the range of
1519 // radii covered by this layer. Units, [cm] the Alice default unit.
1521 // Int_t layer The layer for which the average radii is to be found
1523 // Double_t &range The range of radii covered by this layer
1525 // The average radii for this layer.
1526 Double_t r=0.0,rmin=1.0e6,rmax=-1.0,rp,t[3],l[3],dl[3];
1527 Int_t n=0,i,j,lay,lad,det;
1528 AliITSDetector idet;
1530 for(i=0;i<GetIndexMax();i++) {
1531 GetModuleId(i,lay,lad,det);
1532 idet = GetModuleType(i);
1533 if(lay!=layer) continue;
1534 dl[0] = dl[1] = dl[2] = 0.0;
1535 if(IsShapeDefined((Int_t)idet)) {
1538 dl[0] = ((AliITSgeomSPD*)GetShape(idet))->GetDx();
1539 dl[1] = ((AliITSgeomSPD*)GetShape(idet))->GetDy();
1540 dl[2] = ((AliITSgeomSPD*)GetShape(idet))->GetDz();
1542 case kSDD: case kSDDp:{
1543 dl[0] = ((AliITSgeomSDD*)GetShape(idet))->GetDx();
1544 dl[1] = ((AliITSgeomSDD*)GetShape(idet))->GetDy();
1545 dl[2] = ((AliITSgeomSDD*)GetShape(idet))->GetDz();
1547 case kSSD: case kSSDp:{
1548 dl[0] = ((AliITSgeomSSD*)GetShape(idet))->GetDx();
1549 dl[1] = ((AliITSgeomSSD*)GetShape(idet))->GetDy();
1550 dl[2] = ((AliITSgeomSSD*)GetShape(idet))->GetDz();
1553 Warning("GetAverageRadiusOfLayer",
1554 "idet=kND undefined detector type");
1558 Warning("GetAverageRadiusOfLayer",
1559 "idet=%d not a defined value",(Int_t)idet);
1568 if(rmin>rp) rmin = rp;
1569 if(rmax<rp) rmax = rp;
1570 for(j=0;j<8;j++){ // loop over the corners
1571 l[0] = dl[0];if(j%2==0) l[0] = -dl[0];
1572 l[1] = dl[1];if(j==2||j==3||j==6||j==7) l[1] = -dl[1];
1573 l[2] = dl[2];if(j>3) l[2] = -dl[2];
1575 rp = TMath::Sqrt(t[0]*t[0]+t[1]*t[1]);
1576 if(rmin>rp) rmin = rp;
1577 if(rmax<rp) rmax = rp;
1581 range = TMath::Max(rmax-r,r-rmin);
1584 //_______________________________________________________________________
1585 void AliITSgeom::DetLToTrackingV2(Int_t md,Float_t xin,Float_t zin,
1586 Float_t &yout,Float_t &zout) {
1588 //Conversion from local coordinates on detectors to local
1589 //coordinates used for tracking ("v2")
1591 // Int_t md Module number
1592 // Float_t xin Standard local coordinate x
1593 // Float_t zin Standard local coordinate z
1595 // Float_t yout Tracking local coordinate y
1596 // Float_t zout Tracking local coordinate z
1603 GetRotMatrix(md,rt);
1604 al = TMath::ATan2(rt[1],rt[0])+TMath::Pi();
1605 yout = -(-xin+(x*((Float_t)TMath::Cos(al))+y*((Float_t)TMath::Sin(al))));
1606 if(md<(GetModuleIndex(2,1,1))) yout *= -1;
1609 //_______________________________________________________________________
1610 void AliITSgeom::TrackingV2ToDetL(Int_t md,Float_t yin,Float_t zin,
1611 Float_t &xout,Float_t &zout) {
1612 //Conversion from local coordinates used for tracking ("v2") to
1613 //local detector coordinates
1615 // Int_t md Module number
1616 // Float_t yin Tracking local coordinate y
1617 // Float_t zin Tracking local coordinate z
1619 // Float_t xout Standard local coordinate x
1620 // Float_t zout Standard local coordinate z
1627 GetRotMatrix(md,rt);
1628 al = TMath::ATan2(rt[1],rt[0])+TMath::Pi();
1630 if(md<(GetModuleIndex(2,1,1))) xout = -xout;
1631 xout += (x*((Float_t)TMath::Cos(al))+y*((Float_t)TMath::Sin(al)));
1634 //----------------------------------------------------------------------
1635 ostream &operator<<(ostream &os,AliITSgeom &p){
1636 // Standard output streaming function.
1638 // ostream os The output stream
1639 // AliITSgeom p The AliITSgeom class to be printed out
1648 //----------------------------------------------------------------------
1649 istream &operator>>(istream &is,AliITSgeom &r){
1650 // Standard input streaming function.
1652 // istream is The input stream
1653 // AliITSgeom p The AliITSgeom class to be filled from this
1663 //----------------------------------------------------------------------