2 // Original: AliHLTTrack.cxx,v 1.32 2005/06/14 10:55:21 cvetan
4 /**************************************************************************
5 * This file is property of and copyright by the ALICE HLT Project *
6 * ALICE Experiment at CERN, All rights reserved. *
8 * Primary Authors: Anders Vestbo, Uli Frankenfeld, maintained by *
9 * Matthias Richter <Matthias.Richter@ift.uib.no> *
10 * for The ALICE HLT Project. *
12 * Permission to use, copy, modify and distribute this software and its *
13 * documentation strictly for non-commercial purposes is hereby granted *
14 * without fee, provided that the above copyright notice appears in all *
15 * copies and that both the copyright notice and this permission notice *
16 * appear in the supporting documentation. The authors make no claims *
17 * about the suitability of this software for any purpose. It is *
18 * provided "as is" without express or implied warranty. *
19 **************************************************************************/
21 /** @file AliHLTTPCTrack.cxx
22 @author Anders Vestbo, Uli Frankenfeld, maintained by Matthias Richter
24 @brief HLT TPC track implementation (conformal mapping) */
27 #include "AliHLTTPCLogging.h"
28 #include "AliHLTTPCTrack.h"
29 #include "AliHLTTPCTransform.h"
30 #include "AliHLTTPCVertex.h"
31 #include "AliHLTTPCSpacePointData.h"
37 ClassImp(AliHLTTPCTrack)
40 AliHLTTPCTrack::AliHLTTPCTrack()
85 memset(fHitNumbers,0,fgkHitArraySize*sizeof(UInt_t));
88 void AliHLTTPCTrack::Copy(AliHLTTPCTrack *tpt)
91 SetRowRange(tpt->GetFirstRow(),tpt->GetLastRow());
92 SetPhi0(tpt->GetPhi0());
93 SetKappa(tpt->GetKappa());
94 SetNHits(tpt->GetNHits());
95 SetFirstPoint(tpt->GetFirstPointX(),tpt->GetFirstPointY(),tpt->GetFirstPointZ());
96 SetLastPoint(tpt->GetLastPointX(),tpt->GetLastPointY(),tpt->GetLastPointZ());
98 SetPsi(tpt->GetPsi());
99 SetTgl(tpt->GetTgl());
100 SetPterr(tpt->GetPterr());
101 SetPsierr(tpt->GetPsierr());
102 SetTglerr(tpt->GetTglerr());
103 SetZ0err(tpt->GetZ0err());
104 SetY0err(tpt->GetY0err());
105 SetCharge(tpt->GetCharge());
106 SetHits(tpt->GetNHits(),(UInt_t *)tpt->GetHitNumbers());
107 SetMCid(tpt->GetMCid());
108 SetPID(tpt->GetPID());
109 SetSector(tpt->GetSector());
112 Int_t AliHLTTPCTrack::Compare(const AliHLTTPCTrack *track) const
115 if(track->GetNHits() < GetNHits()) return 1;
116 if(track->GetNHits() > GetNHits()) return -1;
120 AliHLTTPCTrack::~AliHLTTPCTrack()
125 Double_t AliHLTTPCTrack::GetP() const
127 // Returns total momentum.
128 return fabs(GetPt())*sqrt(1. + GetTgl()*GetTgl());
131 Double_t AliHLTTPCTrack::GetPseudoRapidity() const
133 return 0.5 * log((GetP() + GetPz()) / (GetP() - GetPz()));
136 Double_t AliHLTTPCTrack::GetRapidity() const
139 const Double_t kmpi = 0.13957;
140 return 0.5 * log((kmpi + GetPz()) / (kmpi - GetPz()));
143 void AliHLTTPCTrack::Rotate(Int_t slice,Bool_t tolocal)
145 //Rotate track to global parameters
146 //If flag tolocal is set, the track is rotated
147 //to local coordinates.
149 Float_t psi[1] = {GetPsi()};
151 AliHLTTPCTransform::Local2GlobalAngle(psi,slice);
153 AliHLTTPCTransform::Global2LocalAngle(psi,slice);
156 first[0] = GetFirstPointX();
157 first[1] = GetFirstPointY();
158 first[2] = GetFirstPointZ();
160 AliHLTTPCTransform::Local2Global(first,slice);
162 AliHLTTPCTransform::Global2LocHLT(first,slice);
163 //AliHLTTPCTransform::Global2Local(first,slice,kTRUE);
165 SetFirstPoint(first[0],first[1],first[2]);
167 last[0] = GetLastPointX();
168 last[1] = GetLastPointY();
169 last[2] = GetLastPointZ();
171 AliHLTTPCTransform::Local2Global(last,slice);
173 AliHLTTPCTransform::Global2LocHLT(last,slice);
174 //AliHLTTPCTransform::Global2Local(last,slice,kTRUE);
175 SetLastPoint(last[0],last[1],last[2]);
177 Float_t center[3] = {GetCenterX(),GetCenterY(),0};
179 AliHLTTPCTransform::Local2Global(center,slice);
181 AliHLTTPCTransform::Global2LocHLT(center,slice);
182 //AliHLTTPCTransform::Global2Local(center,slice,kTRUE);
183 SetCenterX(center[0]);
184 SetCenterY(center[1]);
186 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
187 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
195 void AliHLTTPCTrack::CalculateHelix()
197 // fit assigned clusters to helix
198 // for straight line fit
199 if (AliHLTTPCTransform::GetBFieldValue() == 0.0 ){
200 fRadius = 999999; //just zero
202 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
203 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
207 //Calculate Radius, CenterX and CenterY from Psi, X0, Y0
208 fRadius = fPt / (AliHLTTPCTransform::GetBFieldValue());
209 if(fRadius) fKappa = -fQ*1./fRadius;
210 else fRadius = 999999; //just zero
211 Double_t trackPhi0 = fPsi + fQ * AliHLTTPCTransform::PiHalf();
213 fCenterX = fFirstPoint[0] - fRadius * cos(trackPhi0);
214 fCenterY = fFirstPoint[1] - fRadius * sin(trackPhi0);
216 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
217 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
221 Double_t AliHLTTPCTrack::GetCrossingAngle(Int_t padrow,Int_t slice)
223 //Calculate the crossing angle between track and given padrow.
224 //Take the dot product of the tangent vector of the track, and
225 //vector perpendicular to the padrow.
226 //In order to do this, we need the tangent vector to the track at the
227 //point. This is done by rotating the radius vector by 90 degrees;
228 //rotation matrix: ( 0 1 )
231 Float_t angle=0;//Angle perpendicular to the padrow in local coordinates
232 if(slice>=0)//Global coordinates
234 AliHLTTPCTransform::Local2GlobalAngle(&angle,slice);
235 if(!CalculateReferencePoint(angle,AliHLTTPCTransform::Row2X(padrow)))
236 cerr<<"AliHLTTPCTrack::GetCrossingAngle : Track does not cross line in slice "<<slice<<" row "<<padrow<<endl;
238 else //should be in local coordinates
241 GetCrossingPoint(padrow,xyz);
249 tangent[0] = (fPoint[1] - GetCenterY())/GetRadius();
250 tangent[1] = -1.*(fPoint[0] - GetCenterX())/GetRadius();
252 Double_t perppadrow[2] = {cos(angle),sin(angle)};
253 Double_t cosbeta = fabs(tangent[0]*perppadrow[0] + tangent[1]*perppadrow[1]);
254 if(cosbeta > 1) cosbeta=1;
255 return acos(cosbeta);
258 Bool_t AliHLTTPCTrack::GetCrossingPoint(Int_t padrow,Float_t *xyz)
260 //Assumes the track is given in local coordinates
263 cerr<<"GetCrossingPoint: Track is given on global coordinates"<<endl;
267 Double_t xHit = AliHLTTPCTransform::Row2X(padrow);
269 //if (xHit < xyz[0]){
270 // LOG(AliHLTTPCLog::kError,"AliHLTTPCTRACK::GetCrossingPoint","")<< "Track doesn't cross padrow "
271 // << padrow <<"(x=" << xHit << "). Smallest x=" << xyz[0] << ENDLOG;
275 // for straight line fit
276 if (AliHLTTPCTransform::GetBFieldValue() == 0.0 ){
278 Double_t yHit = GetFirstPointY() + (Double_t) tan( GetPsi() ) * (xHit - GetFirstPointX());
280 Double_t s = (xHit - GetFirstPointX())*(xHit - GetFirstPointX()) + (yHit - GetFirstPointY())*(yHit - GetFirstPointY());
282 Double_t zHit = GetFirstPointZ() + s * GetTgl();
291 Double_t aa = (xHit - GetCenterX())*(xHit - GetCenterX());
292 Double_t r2 = GetRadius()*GetRadius();
296 Double_t aa2 = sqrt(r2 - aa);
297 Double_t y1 = GetCenterY() + aa2;
298 Double_t y2 = GetCenterY() - aa2;
300 if(fabs(y2) < fabs(y1)) xyz[1] = y2;
302 Double_t yHit = xyz[1];
303 Double_t angle1 = atan2((yHit - GetCenterY()),(xHit - GetCenterX()));
304 if(angle1 < 0) angle1 += 2.*AliHLTTPCTransform::Pi();
305 Double_t angle2 = atan2((GetFirstPointY() - GetCenterY()),(GetFirstPointX() - GetCenterX()));
306 if(angle2 < 0) angle2 += AliHLTTPCTransform::TwoPi();
308 Double_t diffangle = angle1 - angle2;
309 diffangle = fmod(diffangle,AliHLTTPCTransform::TwoPi());
310 if((GetCharge()*diffangle) > 0) diffangle = diffangle - GetCharge()*AliHLTTPCTransform::TwoPi();
312 Double_t stot = fabs(diffangle)*GetRadius();
314 Double_t zHit = GetFirstPointZ() + stot*GetTgl();
322 Bool_t AliHLTTPCTrack::CalculateReferencePoint(Double_t angle,Double_t radius)
324 // Global coordinate: crossing point with y = ax+ b;
325 // a=tan(angle-AliHLTTPCTransform::PiHalf());
327 const Double_t krr=radius; //position of reference plane
328 const Double_t kxr = cos(angle) * krr;
329 const Double_t kyr = sin(angle) * krr;
331 Double_t a = tan(angle-AliHLTTPCTransform::PiHalf());
332 Double_t b = kyr - a * kxr;
334 Double_t pp=(fCenterX+a*fCenterY-a*b)/(1+pow(a,2));
335 Double_t qq=(pow(fCenterX,2)+pow(fCenterY,2)-2*fCenterY*b+pow(b,2)-pow(fRadius,2))/(1+pow(a,2));
337 Double_t racine = pp*pp-qq;
338 if(racine<0) return IsPoint(kFALSE); //no Point
340 Double_t rootRacine = sqrt(racine);
341 Double_t x0 = pp+rootRacine;
342 Double_t x1 = pp-rootRacine;
343 Double_t y0 = a*x0 + b;
344 Double_t y1 = a*x1 + b;
346 Double_t diff0 = sqrt(pow(x0-kxr,2)+pow(y0-kyr,2));
347 Double_t diff1 = sqrt(pow(x1-kxr,2)+pow(y1-kyr,2));
358 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
359 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
360 if(fabs(trackPhi0-pointPhi0)>AliHLTTPCTransform::Pi()){
361 if(trackPhi0<pointPhi0) trackPhi0 += AliHLTTPCTransform::TwoPi();
362 else pointPhi0 += AliHLTTPCTransform::TwoPi();
364 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
365 fPoint[2] = fFirstPoint[2] + stot * fTanl;
367 fPointPsi = pointPhi0 - fQ * AliHLTTPCTransform::PiHalf();
368 if(fPointPsi<0.) fPointPsi+= AliHLTTPCTransform::TwoPi();
369 fPointPsi = fmod(fPointPsi, AliHLTTPCTransform::TwoPi());
371 return IsPoint(kTRUE);
374 Bool_t AliHLTTPCTrack::CalculateEdgePoint(Double_t angle)
376 // Global coordinate: crossing point with y = ax; a=tan(angle);
378 Double_t rmin=AliHLTTPCTransform::Row2X(AliHLTTPCTransform::GetFirstRow(-1)); //min Radius of TPC
379 Double_t rmax=AliHLTTPCTransform::Row2X(AliHLTTPCTransform::GetLastRow(-1)); //max Radius of TPC
381 Double_t a = tan(angle);
382 Double_t pp=(fCenterX+a*fCenterY)/(1+pow(a,2));
383 Double_t qq=(pow(fCenterX,2)+pow(fCenterY,2)-pow(fRadius,2))/(1+pow(a,2));
384 Double_t racine = pp*pp-qq;
385 if(racine<0) return IsPoint(kFALSE); //no Point
386 Double_t rootRacine = sqrt(racine);
387 Double_t x0 = pp+rootRacine;
388 Double_t x1 = pp-rootRacine;
392 Double_t r0 = sqrt(pow(x0,2)+pow(y0,2));
393 Double_t r1 = sqrt(pow(x1,2)+pow(y1,2));
394 //find the right crossing point:
395 //inside the TPC modules
399 if(r0>rmin&&r0<rmax){
400 Double_t da=atan2(y0,x0);
401 if(da<0) da+=AliHLTTPCTransform::TwoPi();
402 if(fabs(da-angle)<0.5)
405 if(r1>rmin&&r1<rmax){
406 Double_t da=atan2(y1,x1);
407 if(da<0) da+=AliHLTTPCTransform::TwoPi();
408 if(fabs(da-angle)<0.5)
411 if(!(ok0||ok1)) return IsPoint(kFALSE); //no Point
414 Double_t diff0 = sqrt(pow(fFirstPoint[0]-x0,2)+pow(fFirstPoint[1]-y0,2));
415 Double_t diff1 = sqrt(pow(fFirstPoint[0]-x1,2)+pow(fFirstPoint[1]-y1,2));
416 if(diff0<diff1) ok1 = kFALSE; //use ok0
417 else ok0 = kFALSE; //use ok1
419 if(ok0){fPoint[0]=x0; fPoint[1]=y0;}
420 else {fPoint[0]=x1; fPoint[1]=y1;}
422 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
423 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
424 if(fabs(trackPhi0-pointPhi0)>AliHLTTPCTransform::Pi()){
425 if(trackPhi0<pointPhi0) trackPhi0 += AliHLTTPCTransform::TwoPi();
426 else pointPhi0 += AliHLTTPCTransform::TwoPi();
428 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
429 fPoint[2] = fFirstPoint[2] + stot * fTanl;
431 fPointPsi = pointPhi0 - fQ * AliHLTTPCTransform::PiHalf();
432 if(fPointPsi<0.) fPointPsi+= AliHLTTPCTransform::TwoPi();
433 fPointPsi = fmod(fPointPsi, AliHLTTPCTransform::TwoPi());
435 return IsPoint(kTRUE);
438 Bool_t AliHLTTPCTrack::CalculatePoint(Double_t xplane)
440 // Local coordinate: crossing point with x plane
442 Double_t racine = pow(fRadius,2)-pow(xplane-fCenterX,2);
443 if(racine<0) return IsPoint(kFALSE);
444 Double_t rootRacine = sqrt(racine);
446 Double_t y0 = fCenterY + rootRacine;
447 Double_t y1 = fCenterY - rootRacine;
448 //Double_t diff0 = sqrt(pow(fFirstPoint[0]-xplane)+pow(fFirstPoint[1]-y0));
449 //Double_t diff1 = sqrt(pow(fFirstPoint[0]-xplane)+pow(fFirstPoint[1]-y1));
450 Double_t diff0 = fabs(y0-fFirstPoint[1]);
451 Double_t diff1 = fabs(y1-fFirstPoint[1]);
454 if(diff0<diff1) fPoint[1]=y0;
457 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
458 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
459 if(fabs(trackPhi0-pointPhi0)>AliHLTTPCTransform::Pi()){
460 if(trackPhi0<pointPhi0) trackPhi0 += AliHLTTPCTransform::TwoPi();
461 else pointPhi0 += AliHLTTPCTransform::TwoPi();
463 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
464 fPoint[2] = fFirstPoint[2] + stot * fTanl;
466 fPointPsi = pointPhi0 - fQ * AliHLTTPCTransform::PiHalf();
467 if(fPointPsi<0.) fPointPsi+= AliHLTTPCTransform::TwoPi();
468 fPointPsi = fmod(fPointPsi, AliHLTTPCTransform::TwoPi());
470 return IsPoint(kTRUE);
473 void AliHLTTPCTrack::UpdateToFirstPoint()
475 //Update track parameters to the innermost point on the track.
476 //This means that the parameters of the track will be given in the point
477 //of closest approach to the first innermost point, i.e. the point
478 //lying on the track fit (and not the coordinates of the innermost point itself).
479 //This function assumes that fFirstPoint is already set to the coordinates of the innermost
482 //During the helix-fit, the first point on the track is set to the coordinates
483 //of the innermost assigned cluster. This may be ok, if you just want a fast
484 //estimate of the "global" track parameters; such as the momentum etc.
485 //However, if you later on want to do more precise local calculations, such
486 //as impact parameter, residuals etc, you need to give the track parameters
487 //according to the actual fit.
488 // for straight line fit
489 if (AliHLTTPCTransform::GetBFieldValue() == 0.0 ){
490 Double_t xc = GetCenterX() - GetFirstPointX();
491 Double_t yc = GetCenterY() - GetFirstPointY();
493 Double_t xn = (Double_t) sin( GetPsi() );
494 Double_t yn = -1. * (Double_t) cos( GetPsi() );
496 Double_t d = xc*xn + yc*yn;
498 Double_t distx = d * xn;
499 Double_t disty = d * yn;
503 point[0] = distx + GetFirstPointX();
504 point[1] = disty + GetFirstPointY();
506 //Update the track parameters
507 SetR0(sqrt(point[0]*point[0]+point[1]*point[1]));
508 SetPhi0(atan2(point[1],point[0]));
509 SetFirstPoint(point[0],point[1],GetZ0());
513 Double_t xc = GetCenterX() - GetFirstPointX();
514 Double_t yc = GetCenterY() - GetFirstPointY();
516 Double_t distx1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
517 Double_t disty1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
518 Double_t distance1 = sqrt(distx1*distx1 + disty1*disty1);
520 Double_t distx2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
521 Double_t disty2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
522 Double_t distance2 = sqrt(distx2*distx2 + disty2*disty2);
524 //Choose the closest:
526 if(distance1 < distance2)
528 point[0] = distx1 + GetFirstPointX();
529 point[1] = disty1 + GetFirstPointY();
533 point[0] = distx2 + GetFirstPointX();
534 point[1] = disty2 + GetFirstPointY();
537 Double_t pointpsi = atan2(point[1]-GetCenterY(),point[0]-GetCenterX());
538 pointpsi -= GetCharge()*AliHLTTPCTransform::PiHalf();
539 if(pointpsi < 0) pointpsi += AliHLTTPCTransform::TwoPi();
541 //Update the track parameters
542 SetR0(sqrt(point[0]*point[0]+point[1]*point[1]));
543 SetPhi0(atan2(point[1],point[0]));
544 SetFirstPoint(point[0],point[1],GetZ0());
549 void AliHLTTPCTrack::GetClosestPoint(AliHLTTPCVertex *vertex,Double_t &closestX,Double_t &closestY,Double_t &closestZ)
551 //Calculate the point of closest approach to the vertex
552 //This function calculates the minimum distance from the helix to the vertex, and choose
553 //the corresponding point lying on the helix as the point of closest approach.
555 Double_t xc = GetCenterX() - vertex->GetX();
556 Double_t yc = GetCenterY() - vertex->GetY();
558 Double_t distx1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
559 Double_t disty1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
560 Double_t distance1 = sqrt(distx1*distx1 + disty1*disty1);
562 Double_t distx2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
563 Double_t disty2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
564 Double_t distance2 = sqrt(distx2*distx2 + disty2*disty2);
566 //Choose the closest:
567 if(distance1 < distance2)
569 closestX = distx1 + vertex->GetX();
570 closestY = disty1 + vertex->GetY();
574 closestX = distx2 + vertex->GetX();
575 closestY = disty2 + vertex->GetY();
578 //Get the z coordinate:
579 Double_t angle1 = atan2((closestY-GetCenterY()),(closestX-GetCenterX()));
580 if(angle1 < 0) angle1 = angle1 + AliHLTTPCTransform::TwoPi();
582 Double_t angle2 = atan2((GetFirstPointY()-GetCenterY()),(GetFirstPointX()-GetCenterX()));
583 if(angle2 < 0) angle2 = angle2 + AliHLTTPCTransform::TwoPi();
585 Double_t diffAngle = angle1 - angle2;
586 diffAngle = fmod(diffAngle,AliHLTTPCTransform::TwoPi());
588 if((GetCharge()*diffAngle) < 0) diffAngle = diffAngle + GetCharge()*AliHLTTPCTransform::TwoPi();
589 Double_t stot = fabs(diffAngle)*GetRadius();
590 closestZ = GetFirstPointZ() - stot*GetTgl();
593 void AliHLTTPCTrack::Print(Option_t* /*option*/) const
595 //print out parameters of track
597 LOG(AliHLTTPCLog::kInformational,"AliHLTTPCTrack::Print","Print values")
598 <<"NH="<<fNHits<<" "<<fMCid<<" K="<<fKappa<<" R="<<fRadius<<" Cx="<<fCenterX<<" Cy="<<fCenterY<<" MVT="
599 <<fFromMainVertex<<" Row0="<<fRowRange[0]<<" Row1="<<fRowRange[1]<<" Sector="<<fSector<<" Q="<<fQ<<" TgLam="
600 <<fTanl<<" psi="<<fPsi<<" pt="<<fPt<<" L="<<fLength<<" "<<fPterr<<" "<<fPsierr<<" "<<fZ0err<<" "
601 <<fTanlerr<<" phi0="<<fPhi0<<" R0="<<fR0<<" Z0="<<fZ0<<" X0="<<fFirstPoint[0]<<" Y0="<<fFirstPoint[1]<<" Z0="
602 <<fFirstPoint[2]<<" XL="<<fLastPoint[0]<<" YL="<<fLastPoint[1]<<" ZL="<<fLastPoint[2]<<" "
603 <<fPoint[0]<<" "<<fPoint[1]<<" "<<fPoint[2]<<" "<<fPointPsi<<" "<<fIsPoint<<" local="
604 <<fIsLocal<<" "<<fPID<<ENDLOG;
608 int AliHLTTPCTrack::Convert2AliKalmanTrack()
610 // The method has been copied from AliHLTHoughKalmanTrack and adapted
611 // to the TPC conformal mapping track parametrization
614 // sector A00 starts at 3 o'clock, sectors are counted counterclockwise
615 // median of sector 00 is at 10 degrees, median of sector A04 at 90
618 Double_t charge=(double) GetCharge();
620 param[1] = GetFirstPointZ();
622 param[4] = charge*(1.0/GetPt());
624 Double_t alpha, phi, xl, yl;
626 // rotate to local coordinates if necessary
628 if(GetSector() == -1){ // track in global coordinates
630 alpha = TMath::ATan2(GetFirstPointY(),GetFirstPointX());
631 double sinAlpha = TMath::Sin(alpha);
632 double cosAlpha = TMath::Cos(alpha);
634 phi = GetPsi() - alpha;
635 xl = GetFirstPointX()*cosAlpha + GetFirstPointY()*sinAlpha;
636 yl = -GetFirstPointX()*sinAlpha + GetFirstPointY()*cosAlpha;
638 } else{ // track in local coordinates
640 alpha = (GetSector()+0.5)*(TMath::TwoPi()/18);
642 xl = GetFirstPointX();
643 yl = GetFirstPointY();
645 // normalize alpha to [-Pi,+Pi]
647 alpha = alpha - TMath::TwoPi() * TMath::Floor( alpha /TMath::TwoPi()+.5);
650 // extra rotation to keep phi in the range (-Pi/2,+Pi/2)
652 const Double_t kMaxPhi = TMath::PiOver2() - 10./180.*TMath::Pi();
654 // normalize phi to [-Pi,+Pi]
656 phi = phi - TMath::TwoPi() * TMath::Floor( phi /TMath::TwoPi()+.5);
660 alpha += TMath::PiOver2();
661 phi -= TMath::PiOver2();
666 else if( phi <= -kMaxPhi )
668 alpha += -TMath::PiOver2();
669 phi -= -TMath::PiOver2();
677 param[2] = TMath::Sin(phi);
681 GetY0err(), //Error in Y (Y and X are the same)
682 0., GetZ0err(), //Error in Z
683 0., 0., GetPsierr(), //Error for Psi
684 0., 0., 0., GetTglerr(), //Error for Tgl
685 0., 0., 0., 0., GetPterr() //Error for Pt
688 Int_t nCluster = GetNHits();
691 // the Set function was not available in earlier versions, check done
692 // during configure; for the AliRoot build, by default ON
693 #ifdef EXTERNALTRACKPARAM_V1
694 #warning track conversion to ESD format needs AliRoot version > v4-05-04
695 //TODO (Feb 07): make this a real warning when logging system is adapted
696 //HLTWarning("track conversion to ESD format needs AliRoot version > v4-05-04");
698 Set(xl,alpha,param,cov);
699 SetNumberOfClusters(nCluster);
708 void AliHLTTPCTrack::SetHits(Int_t nhits,UInt_t *hits)
712 if (nhits>fgkHitArraySize) {
713 LOG(AliHLTTPCLog::kWarning,"AliHLTTPCTrack::SetHits","too many hits")
714 << "too many hits (" << nhits << ") for hit array of size " << fgkHitArraySize << ENDLOG;
715 SetNHits(fgkHitArraySize);
719 memcpy(fHitNumbers,hits,fNHits*sizeof(UInt_t));
722 Double_t AliHLTTPCTrack::GetLengthXY() const
724 //calculates the length of the arc in XY-plane. This is the length of the track in XY-plane.
725 //Using a^2 = b^2 + c^2 - 2bc * cosA for finding the angle between first and last point.
726 //Length of arc is arc = r*A. Where A is the angle between first and last point.
728 Double_t dx = GetLastPointX()-GetFirstPointX();
729 Double_t dy = GetLastPointY()-GetFirstPointY();
730 Double_t a = TMath::Sqrt((dx*dx)+(dy*dy));
731 Double_t r = GetRadius();
734 Double_t A = TMath::ACos((r2+r2-(a*a))/(2*r2));
739 Double_t AliHLTTPCTrack::GetLengthTot() const
741 //Calculates the length of the track in 3D
751 int AliHLTTPCTrack::CheckConsistency()
753 // Check consistency of all members
755 if (CheckDoubleMember(&fPterr, 0., "fPterr")<0) iResult=-EDOM;
756 if (CheckDoubleMember(&fPsierr, 0., "fPsierr")<0) iResult=-EDOM;
757 if (CheckDoubleMember(&fZ0err, 0., "fZ0err")<0) iResult=-EDOM;
758 if (CheckDoubleMember(&fY0err, 0., "fY0err")<0) iResult=-EDOM;
759 if (CheckDoubleMember(&fTanlerr, 0., "fTanlerr")<0) iResult=-EDOM;
763 int AliHLTTPCTrack::CheckDoubleMember(double* pMember, double def, const char* name) const
765 // Check consistency of a Double member
766 if (!pMember) return -EINVAL;
767 if (TMath::Abs(*pMember)>kVeryBig) {
768 LOG(AliHLTTPCLog::kWarning,"AliHLTTPCTrack","member consistency")
769 << "invalid Double number %f" << *pMember << " in member " << name << ENDLOG;