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,0,159*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());
108 SetMCid(tpt->GetMCid());
110 SetPID(tpt->GetPID());
111 SetSector(tpt->GetSector());
114 Int_t AliHLTTPCTrack::Compare(const AliHLTTPCTrack *track) const
117 if(track->GetNHits() < GetNHits()) return 1;
118 if(track->GetNHits() > GetNHits()) return -1;
122 AliHLTTPCTrack::~AliHLTTPCTrack()
127 Double_t AliHLTTPCTrack::GetP() const
129 // Returns total momentum.
130 return fabs(GetPt())*sqrt(1. + GetTgl()*GetTgl());
133 Double_t AliHLTTPCTrack::GetPseudoRapidity() const
135 return 0.5 * log((GetP() + GetPz()) / (GetP() - GetPz()));
139 Double_t AliHLTTPCTrack::GetEta() const
141 return GetPseudoRapidity();
145 Double_t AliHLTTPCTrack::GetRapidity() const
148 const Double_t kmpi = 0.13957;
149 return 0.5 * log((kmpi + GetPz()) / (kmpi - GetPz()));
152 void AliHLTTPCTrack::Rotate(Int_t slice,Bool_t tolocal)
154 //Rotate track to global parameters
155 //If flag tolocal is set, the track is rotated
156 //to local coordinates.
158 Float_t psi[1] = {GetPsi()};
160 AliHLTTPCTransform::Local2GlobalAngle(psi,slice);
162 AliHLTTPCTransform::Global2LocalAngle(psi,slice);
165 first[0] = GetFirstPointX();
166 first[1] = GetFirstPointY();
167 first[2] = GetFirstPointZ();
169 AliHLTTPCTransform::Local2Global(first,slice);
171 AliHLTTPCTransform::Global2LocHLT(first,slice);
172 //AliHLTTPCTransform::Global2Local(first,slice,kTRUE);
174 SetFirstPoint(first[0],first[1],first[2]);
176 last[0] = GetLastPointX();
177 last[1] = GetLastPointY();
178 last[2] = GetLastPointZ();
180 AliHLTTPCTransform::Local2Global(last,slice);
182 AliHLTTPCTransform::Global2LocHLT(last,slice);
183 //AliHLTTPCTransform::Global2Local(last,slice,kTRUE);
184 SetLastPoint(last[0],last[1],last[2]);
186 Float_t center[3] = {GetCenterX(),GetCenterY(),0};
188 AliHLTTPCTransform::Local2Global(center,slice);
190 AliHLTTPCTransform::Global2LocHLT(center,slice);
191 //AliHLTTPCTransform::Global2Local(center,slice,kTRUE);
192 SetCenterX(center[0]);
193 SetCenterY(center[1]);
195 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
196 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
204 void AliHLTTPCTrack::CalculateHelix()
206 // fit assigned clusters to helix
207 // for straight line fit
208 if (AliHLTTPCTransform::GetBFieldValue() == 0.0 ){
209 fRadius = 999999; //just zero
211 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
212 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
216 //Calculate Radius, CenterX and CenterY from Psi, X0, Y0
217 fRadius = fPt / (AliHLTTPCTransform::GetBFieldValue());
218 if(fRadius) fKappa = -fQ*1./fRadius;
219 else fRadius = 999999; //just zero
220 Double_t trackPhi0 = fPsi + fQ * AliHLTTPCTransform::PiHalf();
222 fCenterX = fFirstPoint[0] - fRadius * cos(trackPhi0);
223 fCenterY = fFirstPoint[1] - fRadius * sin(trackPhi0);
225 SetPhi0(atan2(fFirstPoint[1],fFirstPoint[0]));
226 SetR0(sqrt(fFirstPoint[0]*fFirstPoint[0]+fFirstPoint[1]*fFirstPoint[1]));
230 Double_t AliHLTTPCTrack::GetCrossingAngle(Int_t padrow,Int_t slice)
232 //Calculate the crossing angle between track and given padrow.
233 //Take the dot product of the tangent vector of the track, and
234 //vector perpendicular to the padrow.
235 //In order to do this, we need the tangent vector to the track at the
236 //point. This is done by rotating the radius vector by 90 degrees;
237 //rotation matrix: ( 0 1 )
240 Float_t angle=0;//Angle perpendicular to the padrow in local coordinates
241 if(slice>=0)//Global coordinates
243 AliHLTTPCTransform::Local2GlobalAngle(&angle,slice);
244 if(!CalculateReferencePoint(angle,AliHLTTPCTransform::Row2X(padrow)))
245 cerr<<"AliHLTTPCTrack::GetCrossingAngle : Track does not cross line in slice "<<slice<<" row "<<padrow<<endl;
247 else //should be in local coordinates
250 GetCrossingPoint(padrow,xyz);
258 tangent[0] = (fPoint[1] - GetCenterY())/GetRadius();
259 tangent[1] = -1.*(fPoint[0] - GetCenterX())/GetRadius();
261 Double_t perppadrow[2] = {cos(angle),sin(angle)};
262 Double_t cosbeta = fabs(tangent[0]*perppadrow[0] + tangent[1]*perppadrow[1]);
263 if(cosbeta > 1) cosbeta=1;
264 return acos(cosbeta);
267 Bool_t AliHLTTPCTrack::GetCrossingPoint(Int_t padrow,Float_t *xyz)
269 //Assumes the track is given in local coordinates
272 cerr<<"GetCrossingPoint: Track is given on global coordinates"<<endl;
276 Double_t xHit = AliHLTTPCTransform::Row2X(padrow);
278 //if (xHit < xyz[0]){
279 // LOG(AliHLTTPCLog::kError,"AliHLTTPCTRACK::GetCrossingPoint","")<< "Track doesn't cross padrow "
280 // << padrow <<"(x=" << xHit << "). Smallest x=" << xyz[0] << ENDLOG;
284 // for straight line fit
285 if (AliHLTTPCTransform::GetBFieldValue() == 0.0 ){
287 Double_t yHit = GetFirstPointY() + (Double_t) tan( GetPsi() ) * (xHit - GetFirstPointX());
289 Double_t s = (xHit - GetFirstPointX())*(xHit - GetFirstPointX()) + (yHit - GetFirstPointY())*(yHit - GetFirstPointY());
291 Double_t zHit = GetFirstPointZ() + s * GetTgl();
300 Double_t aa = (xHit - GetCenterX())*(xHit - GetCenterX());
301 Double_t r2 = GetRadius()*GetRadius();
305 Double_t aa2 = sqrt(r2 - aa);
306 Double_t y1 = GetCenterY() + aa2;
307 Double_t y2 = GetCenterY() - aa2;
309 if(fabs(y2) < fabs(y1)) xyz[1] = y2;
311 Double_t yHit = xyz[1];
312 Double_t angle1 = atan2((yHit - GetCenterY()),(xHit - GetCenterX()));
313 if(angle1 < 0) angle1 += 2.*AliHLTTPCTransform::Pi();
314 Double_t angle2 = atan2((GetFirstPointY() - GetCenterY()),(GetFirstPointX() - GetCenterX()));
315 if(angle2 < 0) angle2 += AliHLTTPCTransform::TwoPi();
317 Double_t diffangle = angle1 - angle2;
318 diffangle = fmod(diffangle,AliHLTTPCTransform::TwoPi());
319 if((GetCharge()*diffangle) > 0) diffangle = diffangle - GetCharge()*AliHLTTPCTransform::TwoPi();
321 Double_t stot = fabs(diffangle)*GetRadius();
323 Double_t zHit = GetFirstPointZ() + stot*GetTgl();
331 Bool_t AliHLTTPCTrack::CalculateReferencePoint(Double_t angle,Double_t radius)
333 // Global coordinate: crossing point with y = ax+ b;
334 // a=tan(angle-AliHLTTPCTransform::PiHalf());
336 const Double_t krr=radius; //position of reference plane
337 const Double_t kxr = cos(angle) * krr;
338 const Double_t kyr = sin(angle) * krr;
340 Double_t a = tan(angle-AliHLTTPCTransform::PiHalf());
341 Double_t b = kyr - a * kxr;
343 Double_t pp=(fCenterX+a*fCenterY-a*b)/(1+pow(a,2));
344 Double_t qq=(pow(fCenterX,2)+pow(fCenterY,2)-2*fCenterY*b+pow(b,2)-pow(fRadius,2))/(1+pow(a,2));
346 Double_t racine = pp*pp-qq;
347 if(racine<0) return IsPoint(kFALSE); //no Point
349 Double_t rootRacine = sqrt(racine);
350 Double_t x0 = pp+rootRacine;
351 Double_t x1 = pp-rootRacine;
352 Double_t y0 = a*x0 + b;
353 Double_t y1 = a*x1 + b;
355 Double_t diff0 = sqrt(pow(x0-kxr,2)+pow(y0-kyr,2));
356 Double_t diff1 = sqrt(pow(x1-kxr,2)+pow(y1-kyr,2));
367 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
368 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
369 if(fabs(trackPhi0-pointPhi0)>AliHLTTPCTransform::Pi()){
370 if(trackPhi0<pointPhi0) trackPhi0 += AliHLTTPCTransform::TwoPi();
371 else pointPhi0 += AliHLTTPCTransform::TwoPi();
373 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
374 fPoint[2] = fFirstPoint[2] + stot * fTanl;
376 fPointPsi = pointPhi0 - fQ * AliHLTTPCTransform::PiHalf();
377 if(fPointPsi<0.) fPointPsi+= AliHLTTPCTransform::TwoPi();
378 fPointPsi = fmod(fPointPsi, AliHLTTPCTransform::TwoPi());
380 return IsPoint(kTRUE);
383 Bool_t AliHLTTPCTrack::CalculateEdgePoint(Double_t angle)
385 // Global coordinate: crossing point with y = ax; a=tan(angle);
387 Double_t rmin=AliHLTTPCTransform::Row2X(AliHLTTPCTransform::GetFirstRow(-1)); //min Radius of TPC
388 Double_t rmax=AliHLTTPCTransform::Row2X(AliHLTTPCTransform::GetLastRow(-1)); //max Radius of TPC
390 Double_t a = tan(angle);
391 Double_t pp=(fCenterX+a*fCenterY)/(1+pow(a,2));
392 Double_t qq=(pow(fCenterX,2)+pow(fCenterY,2)-pow(fRadius,2))/(1+pow(a,2));
393 Double_t racine = pp*pp-qq;
394 if(racine<0) return IsPoint(kFALSE); //no Point
395 Double_t rootRacine = sqrt(racine);
396 Double_t x0 = pp+rootRacine;
397 Double_t x1 = pp-rootRacine;
401 Double_t r0 = sqrt(pow(x0,2)+pow(y0,2));
402 Double_t r1 = sqrt(pow(x1,2)+pow(y1,2));
403 //find the right crossing point:
404 //inside the TPC modules
408 if(r0>rmin&&r0<rmax){
409 Double_t da=atan2(y0,x0);
410 if(da<0) da+=AliHLTTPCTransform::TwoPi();
411 if(fabs(da-angle)<0.5)
414 if(r1>rmin&&r1<rmax){
415 Double_t da=atan2(y1,x1);
416 if(da<0) da+=AliHLTTPCTransform::TwoPi();
417 if(fabs(da-angle)<0.5)
420 if(!(ok0||ok1)) return IsPoint(kFALSE); //no Point
423 Double_t diff0 = sqrt(pow(fFirstPoint[0]-x0,2)+pow(fFirstPoint[1]-y0,2));
424 Double_t diff1 = sqrt(pow(fFirstPoint[0]-x1,2)+pow(fFirstPoint[1]-y1,2));
425 if(diff0<diff1) ok1 = kFALSE; //use ok0
426 else ok0 = kFALSE; //use ok1
428 if(ok0){fPoint[0]=x0; fPoint[1]=y0;}
429 else {fPoint[0]=x1; fPoint[1]=y1;}
431 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
432 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
433 if(fabs(trackPhi0-pointPhi0)>AliHLTTPCTransform::Pi()){
434 if(trackPhi0<pointPhi0) trackPhi0 += AliHLTTPCTransform::TwoPi();
435 else pointPhi0 += AliHLTTPCTransform::TwoPi();
437 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
438 fPoint[2] = fFirstPoint[2] + stot * fTanl;
440 fPointPsi = pointPhi0 - fQ * AliHLTTPCTransform::PiHalf();
441 if(fPointPsi<0.) fPointPsi+= AliHLTTPCTransform::TwoPi();
442 fPointPsi = fmod(fPointPsi, AliHLTTPCTransform::TwoPi());
444 return IsPoint(kTRUE);
447 Bool_t AliHLTTPCTrack::CalculatePoint(Double_t xplane)
449 // Local coordinate: crossing point with x plane
451 Double_t racine = pow(fRadius,2)-pow(xplane-fCenterX,2);
452 if(racine<0) return IsPoint(kFALSE);
453 Double_t rootRacine = sqrt(racine);
455 Double_t y0 = fCenterY + rootRacine;
456 Double_t y1 = fCenterY - rootRacine;
457 //Double_t diff0 = sqrt(pow(fFirstPoint[0]-xplane)+pow(fFirstPoint[1]-y0));
458 //Double_t diff1 = sqrt(pow(fFirstPoint[0]-xplane)+pow(fFirstPoint[1]-y1));
459 Double_t diff0 = fabs(y0-fFirstPoint[1]);
460 Double_t diff1 = fabs(y1-fFirstPoint[1]);
463 if(diff0<diff1) fPoint[1]=y0;
466 Double_t pointPhi0 = atan2(fPoint[1]-fCenterY,fPoint[0]-fCenterX);
467 Double_t trackPhi0 = atan2(fFirstPoint[1]-fCenterY,fFirstPoint[0]-fCenterX);
468 if(fabs(trackPhi0-pointPhi0)>AliHLTTPCTransform::Pi()){
469 if(trackPhi0<pointPhi0) trackPhi0 += AliHLTTPCTransform::TwoPi();
470 else pointPhi0 += AliHLTTPCTransform::TwoPi();
472 Double_t stot = -fQ * (pointPhi0-trackPhi0) * fRadius ;
473 fPoint[2] = fFirstPoint[2] + stot * fTanl;
475 fPointPsi = pointPhi0 - fQ * AliHLTTPCTransform::PiHalf();
476 if(fPointPsi<0.) fPointPsi+= AliHLTTPCTransform::TwoPi();
477 fPointPsi = fmod(fPointPsi, AliHLTTPCTransform::TwoPi());
479 return IsPoint(kTRUE);
482 void AliHLTTPCTrack::UpdateToFirstPoint()
484 //Update track parameters to the innermost point on the track.
485 //This means that the parameters of the track will be given in the point
486 //of closest approach to the first innermost point, i.e. the point
487 //lying on the track fit (and not the coordinates of the innermost point itself).
488 //This function assumes that fFirstPoint is already set to the coordinates of the innermost
491 //During the helix-fit, the first point on the track is set to the coordinates
492 //of the innermost assigned cluster. This may be ok, if you just want a fast
493 //estimate of the "global" track parameters; such as the momentum etc.
494 //However, if you later on want to do more precise local calculations, such
495 //as impact parameter, residuals etc, you need to give the track parameters
496 //according to the actual fit.
497 // for straight line fit
498 if (AliHLTTPCTransform::GetBFieldValue() == 0.0 ){
499 Double_t xc = GetCenterX() - GetFirstPointX();
500 Double_t yc = GetCenterY() - GetFirstPointY();
502 Double_t xn = (Double_t) sin( GetPsi() );
503 Double_t yn = -1. * (Double_t) cos( GetPsi() );
505 Double_t d = xc*xn + yc*yn;
507 Double_t distx = d * xn;
508 Double_t disty = d * yn;
512 point[0] = distx + GetFirstPointX();
513 point[1] = disty + GetFirstPointY();
515 //Update the track parameters
516 SetR0(sqrt(point[0]*point[0]+point[1]*point[1]));
517 SetPhi0(atan2(point[1],point[0]));
518 SetFirstPoint(point[0],point[1],GetZ0());
522 Double_t xc = GetCenterX() - GetFirstPointX();
523 Double_t yc = GetCenterY() - GetFirstPointY();
525 Double_t distx1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
526 Double_t disty1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
527 Double_t distance1 = sqrt(distx1*distx1 + disty1*disty1);
529 Double_t distx2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
530 Double_t disty2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
531 Double_t distance2 = sqrt(distx2*distx2 + disty2*disty2);
533 //Choose the closest:
535 if(distance1 < distance2)
537 point[0] = distx1 + GetFirstPointX();
538 point[1] = disty1 + GetFirstPointY();
542 point[0] = distx2 + GetFirstPointX();
543 point[1] = disty2 + GetFirstPointY();
546 Double_t pointpsi = atan2(point[1]-GetCenterY(),point[0]-GetCenterX());
547 pointpsi -= GetCharge()*AliHLTTPCTransform::PiHalf();
548 if(pointpsi < 0) pointpsi += AliHLTTPCTransform::TwoPi();
550 //Update the track parameters
551 SetR0(sqrt(point[0]*point[0]+point[1]*point[1]));
552 SetPhi0(atan2(point[1],point[0]));
553 SetFirstPoint(point[0],point[1],GetZ0());
558 void AliHLTTPCTrack::GetClosestPoint(AliHLTTPCVertex *vertex,Double_t &closestX,Double_t &closestY,Double_t &closestZ)
560 //Calculate the point of closest approach to the vertex
561 //This function calculates the minimum distance from the helix to the vertex, and choose
562 //the corresponding point lying on the helix as the point of closest approach.
564 Double_t xc = GetCenterX() - vertex->GetX();
565 Double_t yc = GetCenterY() - vertex->GetY();
567 Double_t distx1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
568 Double_t disty1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
569 Double_t distance1 = sqrt(distx1*distx1 + disty1*disty1);
571 Double_t distx2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
572 Double_t disty2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
573 Double_t distance2 = sqrt(distx2*distx2 + disty2*disty2);
575 //Choose the closest:
576 if(distance1 < distance2)
578 closestX = distx1 + vertex->GetX();
579 closestY = disty1 + vertex->GetY();
583 closestX = distx2 + vertex->GetX();
584 closestY = disty2 + vertex->GetY();
587 //Get the z coordinate:
588 Double_t angle1 = atan2((closestY-GetCenterY()),(closestX-GetCenterX()));
589 if(angle1 < 0) angle1 = angle1 + AliHLTTPCTransform::TwoPi();
591 Double_t angle2 = atan2((GetFirstPointY()-GetCenterY()),(GetFirstPointX()-GetCenterX()));
592 if(angle2 < 0) angle2 = angle2 + AliHLTTPCTransform::TwoPi();
594 Double_t diffAngle = angle1 - angle2;
595 diffAngle = fmod(diffAngle,AliHLTTPCTransform::TwoPi());
597 if((GetCharge()*diffAngle) < 0) diffAngle = diffAngle + GetCharge()*AliHLTTPCTransform::TwoPi();
598 Double_t stot = fabs(diffAngle)*GetRadius();
599 closestZ = GetFirstPointZ() - stot*GetTgl();
602 void AliHLTTPCTrack::Print(Option_t* /*option*/) const
604 //print out parameters of track
606 LOG(AliHLTTPCLog::kInformational,"AliHLTTPCTrack::Print","Print values")
607 <<"NH="<<fNHits<<" "<<fMCid<<" K="<<fKappa<<" R="<<fRadius<<" Cx="<<fCenterX<<" Cy="<<fCenterY<<" MVT="
608 <<fFromMainVertex<<" Row0="<<fRowRange[0]<<" Row1="<<fRowRange[1]<<" Sector="<<fSector<<" Q="<<fQ<<" TgLam="
609 <<fTanl<<" psi="<<fPsi<<" pt="<<fPt<<" L="<<fLength<<" "<<fPterr<<" "<<fPsierr<<" "<<fZ0err<<" "
610 <<fTanlerr<<" phi0="<<fPhi0<<" R0="<<fR0<<" Z0="<<fZ0<<" X0="<<fFirstPoint[0]<<" Y0="<<fFirstPoint[1]<<" Z0="
611 <<fFirstPoint[2]<<" XL="<<fLastPoint[0]<<" YL="<<fLastPoint[1]<<" ZL="<<fLastPoint[2]<<" "
612 <<fPoint[0]<<" "<<fPoint[1]<<" "<<fPoint[2]<<" "<<fPointPsi<<" "<<fIsPoint<<" local="
613 <<fIsLocal<<" "<<fPID<<ENDLOG;
617 int AliHLTTPCTrack::Convert2AliKalmanTrack()
619 // The method has been copied from AliHLTHoughKalmanTrack and adapted
620 // to the TPC conformal mapping track parametrization
623 // sector A00 starts at 3 o'clock, sectors are counted counterclockwise
624 // median of sector 00 is at 10 degrees, median of sector A04 at 90
627 Double_t charge=-1.0 * (double) GetCharge();
629 xx[1] = GetFirstPointZ();
631 xx[4] = charge*(1.0/GetPt());
634 if(GetSector() == -1){
635 alpha = TMath::ATan(fabs(GetFirstPointY())/fabs(GetFirstPointX()));
637 if(GetFirstPointX()<0 && GetFirstPointY()>=0){
638 alpha = alpha + TMath::PiOver2();
640 else if(GetFirstPointX()<0 && GetFirstPointY()<0){
641 alpha = -TMath::Pi() + alpha;
643 else if(GetFirstPointX()>=0 && GetFirstPointY()<0){
646 xhit = GetFirstPointX()*TMath::Cos(alpha) + GetFirstPointY()*TMath::Sin(alpha);
647 xx[0] = -(GetFirstPointX()*TMath::Sin(alpha)) + GetFirstPointY()*TMath::Cos(alpha);
648 xx[2] = TMath::Sin(GetPsi()-alpha);
651 alpha = fmod((2*GetSector()+1)*(TMath::Pi()/18),2*TMath::Pi());
652 if (alpha < -TMath::Pi()) alpha += 2*TMath::Pi();
653 else if (alpha >= TMath::Pi()) alpha -= 2*TMath::Pi();
655 xhit = GetFirstPointX();
656 xx[0] = GetFirstPointY();
657 xx[2] = TMath::Sin(GetPsi());
662 GetY0err(), //Error in Y (Y and X are the same)
663 0., GetZ0err(), //Error in Z
664 0., 0., GetPsierr(), //Error for Psi
665 0., 0., 0., GetTglerr(), //Error for Tgl
666 0., 0., 0., 0., GetPterr() //Error for Pt
669 Int_t nCluster = GetNHits();
672 // the Set function was not available in earlier versions, check done
673 // during configure; for the AliRoot build, by default ON
674 #ifdef EXTERNALTRACKPARAM_V1
675 #warning track conversion to ESD format needs AliRoot version > v4-05-04
676 //TODO (Feb 07): make this a real warning when logging system is adapted
677 //HLTWarning("track conversion to ESD format needs AliRoot version > v4-05-04");
679 Set(xhit,alpha,xx,cov);
680 SetNumberOfClusters(nCluster);
689 void AliHLTTPCTrack::SetHits(Int_t nhits,UInt_t *hits)
693 if (nhits>fgkHitArraySize) {
694 LOG(AliHLTTPCLog::kWarning,"AliHLTTPCTrack::SetHits","too many hits")
695 << "too many hits (" << nhits << ") for hit array of size " << fgkHitArraySize << ENDLOG;
697 memcpy(fHitNumbers,hits,(nhits<=fgkHitArraySize?nhits:fgkHitArraySize)*sizeof(UInt_t));
700 Double_t AliHLTTPCTrack::GetLengthXY() const
702 //calculates the length of the arc in XY-plane. This is the length of the track in XY-plane.
703 //Using a^2 = b^2 + c^2 - 2bc * cosA for finding the angle between first and last point.
704 //Length of arc is arc = r*A. Where A is the angle between first and last point.
706 Double_t dx = GetLastPointX()-GetFirstPointX();
707 Double_t dy = GetLastPointY()-GetFirstPointY();
708 Double_t a = TMath::Sqrt((dx*dx)+(dy*dy));
709 Double_t r = GetRadius();
712 Double_t A = TMath::ACos((r2+r2-(a*a))/(2*r2));
717 Double_t AliHLTTPCTrack::GetLengthTot() const
719 //Calculates the length of the track in 3D
729 int AliHLTTPCTrack::CheckConsistency()
731 // Check consistency of all members
733 if (CheckDoubleMember(&fPterr, 0., "fPterr")<0) iResult=-EDOM;
734 if (CheckDoubleMember(&fPsierr, 0., "fPsierr")<0) iResult=-EDOM;
735 if (CheckDoubleMember(&fZ0err, 0., "fZ0err")<0) iResult=-EDOM;
736 if (CheckDoubleMember(&fY0err, 0., "fY0err")<0) iResult=-EDOM;
737 if (CheckDoubleMember(&fTanlerr, 0., "fTanlerr")<0) iResult=-EDOM;
741 int AliHLTTPCTrack::CheckDoubleMember(double* pMember, double def, const char* name) const
743 // Check consistency of a Double member
744 if (!pMember) return -EINVAL;
745 if (TMath::Abs(*pMember)>kVeryBig) {
746 LOG(AliHLTTPCLog::kWarning,"AliHLTTPCTrack","member consistency")
747 << "invalid Double number %f" << *pMember << " in member " << name << ENDLOG;