Set values to zero in constructor. Added print function.
[u/mrichter/AliRoot.git] / HLT / src / AliL3Track.cxx
CommitLineData
3e87ef69 1// @(#) $Id$
6d4f1901 2
2d04dcbf 3// Author: Anders Vestbo <mailto:vestbo$fi.uib.no>, Uli Frankenfeld <mailto:franken@fi.uib.no>
3e87ef69 4//*-- Copyright &copy ALICE HLT Group
108615fc 5
118c26c3 6#include "AliL3StandardIncludes.h"
14e76e91 7#include "AliL3RootTypes.h"
108615fc 8#include "AliL3RootTypes.h"
108615fc 9#include "AliL3Logging.h"
10#include "AliL3Track.h"
0391971c 11#include "AliL3Transform.h"
6d4f1901 12#include "AliL3Vertex.h"
de3c3890 13#include "AliL3SpacePointData.h"
118c26c3 14
0bd0c1ef 15#if __GNUC__ == 3
3e87ef69 16using namespace std;
17#endif
108615fc 18
3e87ef69 19/** \class AliL3Track
20//<pre>
2d04dcbf 21//_____________________________________________________________
22// AliL3Track
23//
24// Track base class
02cb36b2 25//Begin_Html
3e87ef69 26//<img src="track_coordinates.gif">
02cb36b2 27//End_Html
3e87ef69 28</pre>
29*/
0391971c 30
108615fc 31ClassImp(AliL3Track)
32
108615fc 33
34AliL3Track::AliL3Track()
35{
36 //Constructor
108615fc 37 fNHits = 0;
38 fMCid = -1;
39 fKappa=0;
40 fRadius=0;
41 fCenterX=0;
42 fCenterY=0;
43 ComesFromMainVertex(false);
44 fQ = 0;
45 fPhi0=0;
46 fPsi=0;
47 fR0=0;
48 fTanl=0;
49 fZ0=0;
50 fPt=0;
51 fLength=0;
52 fIsLocal=true;
53 fRowRange[0]=0;
54 fRowRange[1]=0;
3e87ef69 55 SetFirstPoint(0,0,0);
56 SetLastPoint(0,0,0);
68a27388 57 memset(fHitNumbers,0,159*sizeof(UInt_t));
de3c3890 58 fPID = 0;
61bd40de 59
60 fSector=0;
61 fPterr=0;
62 fPsierr=0;
63 fZ0err=0;
64 fTanlerr=0;
65 fPoint[0]=fPoint[1]=fPoint[2]=0;
66 fPointPsi=0;
108615fc 67}
68
b1ed0288 69void AliL3Track::Set(AliL3Track *tpt)
70{
71 //setter
3a735e00 72 SetRowRange(tpt->GetFirstRow(),tpt->GetLastRow());
73 SetPhi0(tpt->GetPhi0());
74 SetKappa(tpt->GetKappa());
75 SetNHits(tpt->GetNHits());
76 SetFirstPoint(tpt->GetFirstPointX(),tpt->GetFirstPointY(),tpt->GetFirstPointZ());
77 SetLastPoint(tpt->GetLastPointX(),tpt->GetLastPointY(),tpt->GetLastPointZ());
78 SetPt(tpt->GetPt());
79 SetPsi(tpt->GetPsi());
80 SetTgl(tpt->GetTgl());
81 SetCharge(tpt->GetCharge());
82 SetHits(tpt->GetNHits(),(UInt_t *)tpt->GetHitNumbers());
4a0bee4e 83#ifdef do_mc
84 SetMCid(tpt->GetMCid());
85#endif
de3c3890 86 SetPID(tpt->GetPID());
87 SetSector(tpt->GetSector());
108615fc 88}
89
203925a9 90Int_t AliL3Track::Compare(const AliL3Track *track) const
91{
b1ed0288 92 // compare tracks
203925a9 93 if(track->GetNHits() < GetNHits()) return 1;
94 if(track->GetNHits() > GetNHits()) return -1;
95 return 0;
96}
108615fc 97
98AliL3Track::~AliL3Track()
99{
203925a9 100 //Nothing to do
108615fc 101}
102
103Double_t AliL3Track::GetP() const
104{
203925a9 105 // Returns total momentum.
108615fc 106 return fabs(GetPt())*sqrt(1. + GetTgl()*GetTgl());
108615fc 107}
108
109Double_t AliL3Track::GetPseudoRapidity() const
b1ed0288 110{ //get pseudo rap
108615fc 111 return 0.5 * log((GetP() + GetPz()) / (GetP() - GetPz()));
112}
eeddc64d 113
203925a9 114/*
108615fc 115Double_t AliL3Track::GetEta() const
116{
117 return GetPseudoRapidity();
118}
203925a9 119*/
eeddc64d 120
108615fc 121Double_t AliL3Track::GetRapidity() const
b1ed0288 122{
123 //get rap
14e76e91 124 const Double_t kmpi = 0.13957;
125 return 0.5 * log((kmpi + GetPz()) / (kmpi - GetPz()));
108615fc 126}
127
203925a9 128void AliL3Track::Rotate(Int_t slice,Bool_t tolocal)
0391971c 129{
0391971c 130 //Rotate track to global parameters
203925a9 131 //If flag tolocal is set, the track is rotated
132 //to local coordinates.
0391971c 133
0391971c 134 Float_t psi[1] = {GetPsi()};
203925a9 135 if(!tolocal)
494fad94 136 AliL3Transform::Local2GlobalAngle(psi,slice);
203925a9 137 else
494fad94 138 AliL3Transform::Global2LocalAngle(psi,slice);
0391971c 139 SetPsi(psi[0]);
140 Float_t first[3];
141 first[0] = GetFirstPointX();
142 first[1] = GetFirstPointY();
143 first[2] = GetFirstPointZ();
203925a9 144 if(!tolocal)
494fad94 145 AliL3Transform::Local2Global(first,slice);
203925a9 146 else
5a31e9df 147 AliL3Transform::Global2LocHLT(first,slice);
148 //AliL3Transform::Global2Local(first,slice,kTRUE);
203925a9 149
0391971c 150 SetFirstPoint(first[0],first[1],first[2]);
151 Float_t last[3];
152 last[0] = GetLastPointX();
153 last[1] = GetLastPointY();
154 last[2] = GetLastPointZ();
203925a9 155 if(!tolocal)
494fad94 156 AliL3Transform::Local2Global(last,slice);
203925a9 157 else
5a31e9df 158 AliL3Transform::Global2LocHLT(last,slice);
159 //AliL3Transform::Global2Local(last,slice,kTRUE);
0391971c 160 SetLastPoint(last[0],last[1],last[2]);
203925a9 161
6d4f1901 162 Float_t center[3] = {GetCenterX(),GetCenterY(),0};
163 if(!tolocal)
494fad94 164 AliL3Transform::Local2Global(center,slice);
6d4f1901 165 else
5a31e9df 166 AliL3Transform::Global2LocHLT(center,slice);
167 //AliL3Transform::Global2Local(center,slice,kTRUE);
6d4f1901 168 SetCenterX(center[0]);
169 SetCenterY(center[1]);
170
3e87ef69 171 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
172 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
173
203925a9 174 if(!tolocal)
175 fIsLocal=kFALSE;
176 else
177 fIsLocal=kTRUE;
0391971c 178}
179
b1ed0288 180void AliL3Track::CalculateHelix()
181{
eeddc64d 182 //Calculate Radius, CenterX and CenterY from Psi, X0, Y0
5a31e9df 183 fRadius = fPt / (AliL3Transform::GetBFieldValue());
3ceb3fe1 184 if(fRadius) fKappa = -fQ*1./fRadius;
108615fc 185 else fRadius = 999999; //just zero
5a31e9df 186 Double_t trackPhi0 = fPsi + fQ * AliL3Transform::PiHalf();
108615fc 187
188 fCenterX = fFirstPoint[0] - fRadius * cos(trackPhi0);
189 fCenterY = fFirstPoint[1] - fRadius * sin(trackPhi0);
3e87ef69 190
191 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
192 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
108615fc 193}
194
3e87ef69 195Double_t AliL3Track::GetCrossingAngle(Int_t padrow,Int_t slice)
0391971c 196{
197 //Calculate the crossing angle between track and given padrow.
0391971c 198 //Take the dot product of the tangent vector of the track, and
199 //vector perpendicular to the padrow.
dab230b2 200 //In order to do this, we need the tangent vector to the track at the
201 //point. This is done by rotating the radius vector by 90 degrees;
202 //rotation matrix: ( 0 1 )
203 // ( -1 0 )
3e87ef69 204
205 Float_t angle=0;//Angle perpendicular to the padrow in local coordinates
206 if(slice>=0)//Global coordinates
207 {
208 AliL3Transform::Local2GlobalAngle(&angle,slice);
209 if(!CalculateReferencePoint(angle,AliL3Transform::Row2X(padrow)))
210 cerr<<"AliL3Track::GetCrossingAngle : Track does not cross line in slice "<<slice<<" row "<<padrow<<endl;
211 }
212 else //should be in local coordinates
213 {
214 Float_t xyz[3];
215 GetCrossingPoint(padrow,xyz);
216 fPoint[0] = xyz[0];
217 fPoint[1] = xyz[1];
218 fPoint[2] = xyz[2];
219 }
220
0391971c 221 Double_t tangent[2];
dab230b2 222
3e87ef69 223 tangent[0] = (fPoint[1] - GetCenterY())/GetRadius();
224 tangent[1] = -1.*(fPoint[0] - GetCenterX())/GetRadius();
225
14e76e91 226 Double_t perppadrow[2] = {cos(angle),sin(angle)};
227 Double_t cosbeta = fabs(tangent[0]*perppadrow[0] + tangent[1]*perppadrow[1]);
228 if(cosbeta > 1) cosbeta=1;
229 return acos(cosbeta);
0391971c 230}
231
3e87ef69 232Bool_t AliL3Track::GetCrossingPoint(Int_t padrow,Float_t *xyz)
0391971c 233{
234 //Assumes the track is given in local coordinates
3e87ef69 235
0391971c 236 if(!IsLocal())
237 {
3e87ef69 238 cerr<<"GetCrossingPoint: Track is given on global coordinates"<<endl;
0391971c 239 return false;
240 }
241
494fad94 242 Double_t xHit = AliL3Transform::Row2X(padrow);
0391971c 243
244 xyz[0] = xHit;
245 Double_t aa = (xHit - GetCenterX())*(xHit - GetCenterX());
246 Double_t r2 = GetRadius()*GetRadius();
247 if(aa > r2)
248 return false;
249
250 Double_t aa2 = sqrt(r2 - aa);
251 Double_t y1 = GetCenterY() + aa2;
252 Double_t y2 = GetCenterY() - aa2;
253 xyz[1] = y1;
254 if(fabs(y2) < fabs(y1)) xyz[1] = y2;
3e87ef69 255
0391971c 256 Double_t yHit = xyz[1];
257 Double_t angle1 = atan2((yHit - GetCenterY()),(xHit - GetCenterX()));
9ca67380 258 if(angle1 < 0) angle1 += 2.*AliL3Transform::Pi();
0391971c 259 Double_t angle2 = atan2((GetFirstPointY() - GetCenterY()),(GetFirstPointX() - GetCenterX()));
5a31e9df 260 if(angle2 < 0) angle2 += AliL3Transform::TwoPi();
14e76e91 261 Double_t diffangle = angle1 - angle2;
262 diffangle = fmod(diffangle,AliL3Transform::TwoPi());
263 if((GetCharge()*diffangle) > 0) diffangle = diffangle - GetCharge()*AliL3Transform::TwoPi();
264 Double_t stot = fabs(diffangle)*GetRadius();
265 Double_t zHit = GetFirstPointZ() + stot*GetTgl();
0391971c 266 xyz[2] = zHit;
3e87ef69 267
0391971c 268 return true;
3e87ef69 269
0391971c 270}
271
b1ed0288 272Bool_t AliL3Track::CalculateReferencePoint(Double_t angle,Double_t radius)
273{
5a31e9df 274 // Global coordinate: crossing point with y = ax+ b;
275 // a=tan(angle-AliL3Transform::PiHalf());
108615fc 276 //
14e76e91 277 const Double_t krr=radius; //position of reference plane
278 const Double_t kxr = cos(angle) * krr;
279 const Double_t kyr = sin(angle) * krr;
6d4f1901 280
5a31e9df 281 Double_t a = tan(angle-AliL3Transform::PiHalf());
14e76e91 282 Double_t b = kyr - a * kxr;
108615fc 283
284 Double_t pp=(fCenterX+a*fCenterY-a*b)/(1+pow(a,2));
285 Double_t qq=(pow(fCenterX,2)+pow(fCenterY,2)-2*fCenterY*b+pow(b,2)-pow(fRadius,2))/(1+pow(a,2));
286
287 Double_t racine = pp*pp-qq;
288 if(racine<0) return IsPoint(kFALSE); //no Point
289
290 Double_t rootRacine = sqrt(racine);
291 Double_t x0 = pp+rootRacine;
292 Double_t x1 = pp-rootRacine;
293 Double_t y0 = a*x0 + b;
294 Double_t y1 = a*x1 + b;
295
14e76e91 296 Double_t diff0 = sqrt(pow(x0-kxr,2)+pow(y0-kyr,2));
297 Double_t diff1 = sqrt(pow(x1-kxr,2)+pow(y1-kyr,2));
108615fc 298
299 if(diff0<diff1){
300 fPoint[0]=x0;
301 fPoint[1]=y0;
302 }
303 else{
304 fPoint[0]=x1;
305 fPoint[1]=y1;
306 }
307
308 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
309 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
5a31e9df 310 if(fabs(trackPhi0-pointPhi0)>AliL3Transform::Pi()){
311 if(trackPhi0<pointPhi0) trackPhi0 += AliL3Transform::TwoPi();
312 else pointPhi0 += AliL3Transform::TwoPi();
108615fc 313 }
314 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
315 fPoint[2] = fFirstPoint[2] + stot * fTanl;
316
5a31e9df 317 fPointPsi = pointPhi0 - fQ * AliL3Transform::PiHalf();
318 if(fPointPsi<0.) fPointPsi+= AliL3Transform::TwoPi();
319 fPointPsi = fmod(fPointPsi, AliL3Transform::TwoPi());
108615fc 320
321 return IsPoint(kTRUE);
322}
323
b1ed0288 324Bool_t AliL3Track::CalculateEdgePoint(Double_t angle)
325{
108615fc 326 // Global coordinate: crossing point with y = ax; a=tan(angle);
327 //
4a0bee4e 328 Double_t rmin=AliL3Transform::Row2X(AliL3Transform::GetFirstRow(-1)); //min Radius of TPC
329 Double_t rmax=AliL3Transform::Row2X(AliL3Transform::GetLastRow(-1)); //max Radius of TPC
108615fc 330
331 Double_t a = tan(angle);
332 Double_t pp=(fCenterX+a*fCenterY)/(1+pow(a,2));
333 Double_t qq=(pow(fCenterX,2)+pow(fCenterY,2)-pow(fRadius,2))/(1+pow(a,2));
334 Double_t racine = pp*pp-qq;
335 if(racine<0) return IsPoint(kFALSE); //no Point
336 Double_t rootRacine = sqrt(racine);
337 Double_t x0 = pp+rootRacine;
338 Double_t x1 = pp-rootRacine;
339 Double_t y0 = a*x0;
340 Double_t y1 = a*x1;
341
342 Double_t r0 = sqrt(pow(x0,2)+pow(y0,2));
343 Double_t r1 = sqrt(pow(x1,2)+pow(y1,2));
344 //find the right crossing point:
345 //inside the TPC modules
346 Bool_t ok0 = kFALSE;
347 Bool_t ok1 = kFALSE;
472d9e24 348
108615fc 349 if(r0>rmin&&r0<rmax){
350 Double_t da=atan2(y0,x0);
5a31e9df 351 if(da<0) da+=AliL3Transform::TwoPi();
108615fc 352 if(fabs(da-angle)<0.5)
353 ok0 = kTRUE;
354 }
355 if(r1>rmin&&r1<rmax){
472d9e24 356 Double_t da=atan2(y1,x1);
5a31e9df 357 if(da<0) da+=AliL3Transform::TwoPi();
108615fc 358 if(fabs(da-angle)<0.5)
359 ok1 = kTRUE;
360 }
361 if(!(ok0||ok1)) return IsPoint(kFALSE); //no Point
362
363 if(ok0&&ok1){
364 Double_t diff0 = sqrt(pow(fFirstPoint[0]-x0,2)+pow(fFirstPoint[1]-y0,2));
365 Double_t diff1 = sqrt(pow(fFirstPoint[0]-x1,2)+pow(fFirstPoint[1]-y1,2));
366 if(diff0<diff1) ok1 = kFALSE; //use ok0
367 else ok0 = kFALSE; //use ok1
368 }
369 if(ok0){fPoint[0]=x0; fPoint[1]=y0;}
370 else {fPoint[0]=x1; fPoint[1]=y1;}
371
372 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
373 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
5a31e9df 374 if(fabs(trackPhi0-pointPhi0)>AliL3Transform::Pi()){
375 if(trackPhi0<pointPhi0) trackPhi0 += AliL3Transform::TwoPi();
376 else pointPhi0 += AliL3Transform::TwoPi();
108615fc 377 }
378 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
379 fPoint[2] = fFirstPoint[2] + stot * fTanl;
380
5a31e9df 381 fPointPsi = pointPhi0 - fQ * AliL3Transform::PiHalf();
382 if(fPointPsi<0.) fPointPsi+= AliL3Transform::TwoPi();
383 fPointPsi = fmod(fPointPsi, AliL3Transform::TwoPi());
108615fc 384
385 return IsPoint(kTRUE);
386}
387
b1ed0288 388Bool_t AliL3Track::CalculatePoint(Double_t xplane)
389{
108615fc 390 // Local coordinate: crossing point with x plane
391 //
392 Double_t racine = pow(fRadius,2)-pow(xplane-fCenterX,2);
393 if(racine<0) return IsPoint(kFALSE);
394 Double_t rootRacine = sqrt(racine);
395
396 Double_t y0 = fCenterY + rootRacine;
397 Double_t y1 = fCenterY - rootRacine;
398 //Double_t diff0 = sqrt(pow(fFirstPoint[0]-xplane)+pow(fFirstPoint[1]-y0));
399 //Double_t diff1 = sqrt(pow(fFirstPoint[0]-xplane)+pow(fFirstPoint[1]-y1));
400 Double_t diff0 = fabs(y0-fFirstPoint[1]);
401 Double_t diff1 = fabs(y1-fFirstPoint[1]);
402
403 fPoint[0]=xplane;
404 if(diff0<diff1) fPoint[1]=y0;
405 else fPoint[1]=y1;
406
407 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
408 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
5a31e9df 409 if(fabs(trackPhi0-pointPhi0)>AliL3Transform::Pi()){
410 if(trackPhi0<pointPhi0) trackPhi0 += AliL3Transform::TwoPi();
411 else pointPhi0 += AliL3Transform::TwoPi();
108615fc 412 }
413 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
414 fPoint[2] = fFirstPoint[2] + stot * fTanl;
415
5a31e9df 416 fPointPsi = pointPhi0 - fQ * AliL3Transform::PiHalf();
417 if(fPointPsi<0.) fPointPsi+= AliL3Transform::TwoPi();
418 fPointPsi = fmod(fPointPsi, AliL3Transform::TwoPi());
108615fc 419
420 return IsPoint(kTRUE);
421}
422
3e87ef69 423void AliL3Track::UpdateToFirstPoint()
424{
425 //Update track parameters to the innermost point on the track.
1f1942b8 426 //This means that the parameters of the track will be given in the point
427 //of closest approach to the first innermost point, i.e. the point
428 //lying on the track fit (and not the coordinates of the innermost point itself).
429 //This function assumes that fFirstPoint is already set to the coordinates of the innermost
430 //assigned cluster.
431 //
432 //During the helix-fit, the first point on the track is set to the coordinates
433 //of the innermost assigned cluster. This may be ok, if you just want a fast
434 //estimate of the "global" track parameters; such as the momentum etc.
435 //However, if you later on want to do more precise local calculations, such
436 //as impact parameter, residuals etc, you need to give the track parameters
437 //according to the actual fit.
3e87ef69 438
1f1942b8 439 Double_t xc = GetCenterX() - GetFirstPointX();
440 Double_t yc = GetCenterY() - GetFirstPointY();
3e87ef69 441
14e76e91 442 Double_t distx1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
443 Double_t disty1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
444 Double_t distance1 = sqrt(distx1*distx1 + disty1*disty1);
3e87ef69 445
14e76e91 446 Double_t distx2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
447 Double_t disty2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
448 Double_t distance2 = sqrt(distx2*distx2 + disty2*disty2);
3e87ef69 449
1f1942b8 450 //Choose the closest:
451 Double_t point[2];
452 if(distance1 < distance2)
453 {
14e76e91 454 point[0] = distx1 + GetFirstPointX();
455 point[1] = disty1 + GetFirstPointY();
1f1942b8 456 }
457 else
458 {
14e76e91 459 point[0] = distx2 + GetFirstPointX();
460 point[1] = disty2 + GetFirstPointY();
1f1942b8 461 }
462
463 Double_t pointpsi = atan2(point[1]-GetCenterY(),point[0]-GetCenterX());
5a31e9df 464 pointpsi -= GetCharge()*AliL3Transform::PiHalf();
465 if(pointpsi < 0) pointpsi += AliL3Transform::TwoPi();
3e87ef69 466
1f1942b8 467 //Update the track parameters
468 SetR0(sqrt(point[0]*point[0]+point[1]*point[1]));
469 SetPhi0(atan2(point[1],point[0]));
470 SetFirstPoint(point[0],point[1],GetZ0());
471 SetPsi(pointpsi);
3e87ef69 472
3e87ef69 473}
474
14e76e91 475void AliL3Track::GetClosestPoint(AliL3Vertex *vertex,Double_t &closestx,Double_t &closesty,Double_t &closestz)
6d4f1901 476{
477 //Calculate the point of closest approach to the vertex
1f1942b8 478 //This function calculates the minimum distance from the helix to the vertex, and choose
479 //the corresponding point lying on the helix as the point of closest approach.
6d4f1901 480
1f1942b8 481 Double_t xc = GetCenterX() - vertex->GetX();
6d4f1901 482 Double_t yc = GetCenterY() - vertex->GetY();
483
14e76e91 484 Double_t distx1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
485 Double_t disty1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
486 Double_t distance1 = sqrt(distx1*distx1 + disty1*disty1);
6d4f1901 487
14e76e91 488 Double_t distx2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
489 Double_t disty2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
490 Double_t distance2 = sqrt(distx2*distx2 + disty2*disty2);
6d4f1901 491
492 //Choose the closest:
493 if(distance1 < distance2)
494 {
14e76e91 495 closestx = distx1 + vertex->GetX();
496 closesty = disty1 + vertex->GetY();
6d4f1901 497 }
498 else
499 {
14e76e91 500 closestx = distx2 + vertex->GetX();
501 closesty = disty2 + vertex->GetY();
6d4f1901 502 }
503
504 //Get the z coordinate:
14e76e91 505 Double_t angle1 = atan2((closesty-GetCenterY()),(closestx-GetCenterX()));
5a31e9df 506 if(angle1 < 0) angle1 = angle1 + AliL3Transform::TwoPi();
6d4f1901 507
508 Double_t angle2 = atan2((GetFirstPointY()-GetCenterY()),(GetFirstPointX()-GetCenterX()));
5a31e9df 509 if(angle2 < 0) angle2 = angle2 + AliL3Transform::TwoPi();
6d4f1901 510
511 Double_t diff_angle = angle1 - angle2;
5a31e9df 512 diff_angle = fmod(diff_angle,AliL3Transform::TwoPi());
6d4f1901 513
5a31e9df 514 if((GetCharge()*diff_angle) < 0) diff_angle = diff_angle + GetCharge()*AliL3Transform::TwoPi();
14e76e91 515 Double_t stot = fabs(diff_angle)*GetRadius();
516 closestz = GetFirstPointZ() - stot*GetTgl();
6d4f1901 517}
61bd40de 518
519void AliL3Track::Print() const
520{
521 LOG(AliL3Log::kInformational,"AliL3Track::Print","Print values")
522 <<fNHits<<" "<<fMCid<<" "<<fKappa<<" "<<fRadius<<" "<<fCenterX<<" "<<fCenterY<<" "<<fFromMainVertex<<" "<<fRowRange[0]<<" "<<fRowRange[1]<<" "<<fSector<<" "<<fQ<<" "<<fTanl<<" "<<fPsi<<" "<<fPt<<" "<<fLength<<" "<<fPterr<<" "<<fPsierr<<" "<<fZ0err<<" "<<fTanlerr<<" "<<fPhi0<<" "<<fR0<<" "<<fZ0<<" "<<fFirstPoint[0]<<" "<<fFirstPoint[1]<<" "<<fFirstPoint[2]<<" "<<fLastPoint[0]<<" "<<fLastPoint[1]<<" "<<fLastPoint[2]<<" "<<fPoint[0]<<" "<<fPoint[1]<<" "<<fPoint[2]<<" "<<fPointPsi<<" "<<fIsPoint<<" "<<fIsLocal<<" "<<fPID<<ENDLOG;
523
524}