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a0cef3e1 | 1 | // @(#) $Id$ |
2 | // origin: hough/AliL3HoughTrack.cxx,v 1.23 ue Mar 28 18:05:12 2006 UTC by alibrary | |
3 | ||
4 | // Author: Anders Vestbo <mailto:vestbo@fi.uib.no> | |
5 | //*-- Copyright © ALICE HLT Group | |
6 | ||
d2ef7687 | 7 | #include "AliHLTStdIncludes.h" |
a0cef3e1 | 8 | |
d2ef7687 | 9 | #include "AliHLTTPCLogging.h" |
a0cef3e1 | 10 | #include "AliHLTTPCHoughTrack.h" |
d2ef7687 | 11 | #include "AliHLTTPCTransform.h" |
12 | #include "AliHLTTPCHoughTransformerRow.h" | |
a0cef3e1 | 13 | |
14 | #if __GNUC__ >= 3 | |
15 | using namespace std; | |
16 | #endif | |
17 | ||
18 | /** \class AliHLTTPCHoughTrack | |
19 | <pre> | |
20 | //_____________________________________________________________ | |
21 | // AliHLTTPCHoughTrack | |
22 | // | |
23 | // Track class for Hough tracklets | |
24 | // | |
25 | </pre> | |
26 | */ | |
27 | ||
d2ef7687 | 28 | ClassImp(AliHLTTPCHoughTrack); |
a0cef3e1 | 29 | |
30 | ||
d2ef7687 | 31 | AliHLTTPCHoughTrack::AliHLTTPCHoughTrack() : AliHLTTPCTrack() |
a0cef3e1 | 32 | { |
33 | //Constructor | |
34 | ||
35 | fWeight = 0; | |
36 | fMinDist=0; | |
37 | fDLine = 0; | |
38 | fPsiLine = 0; | |
39 | fIsHelix = true; | |
40 | fEtaIndex = -1; | |
41 | fEta = 0; | |
42 | ComesFromMainVertex(kTRUE); | |
43 | } | |
44 | ||
45 | AliHLTTPCHoughTrack::~AliHLTTPCHoughTrack() | |
46 | { | |
47 | //dtor | |
48 | } | |
49 | ||
d2ef7687 | 50 | void AliHLTTPCHoughTrack::Set(AliHLTTPCTrack *track) |
a0cef3e1 | 51 | { |
52 | //Basically copy constructor | |
53 | AliHLTTPCHoughTrack *tpt = (AliHLTTPCHoughTrack*)track; | |
54 | SetTrackParameters(tpt->GetKappa(),tpt->GetPsi(),tpt->GetWeight()); | |
55 | SetEtaIndex(tpt->GetEtaIndex()); | |
56 | SetEta(tpt->GetEta()); | |
57 | SetTgl(tpt->GetTgl()); | |
58 | SetPsi(tpt->GetPsi()); | |
59 | SetPterr(tpt->GetPterr()); | |
60 | SetTglerr(tpt->GetTglerr()); | |
61 | SetPsierr(tpt->GetPsierr()); | |
62 | SetCenterX(tpt->GetCenterX()); | |
63 | SetCenterY(tpt->GetCenterY()); | |
64 | SetFirstPoint(tpt->GetFirstPointX(),tpt->GetFirstPointY(),tpt->GetFirstPointZ()); | |
65 | SetLastPoint(tpt->GetLastPointX(),tpt->GetLastPointY(),tpt->GetLastPointZ()); | |
66 | SetCharge(tpt->GetCharge()); | |
67 | SetRowRange(tpt->GetFirstRow(),tpt->GetLastRow()); | |
68 | SetSlice(tpt->GetSlice()); | |
69 | SetHits(tpt->GetNHits(),(UInt_t *)tpt->GetHitNumbers()); | |
70 | SetMCid(tpt->GetMCid()); | |
71 | SetBinXY(tpt->GetBinX(),tpt->GetBinY(),tpt->GetSizeX(),tpt->GetSizeY()); | |
72 | SetSector(tpt->GetSector()); | |
73 | return; | |
74 | ||
75 | // fWeight = tpt->GetWeight(); | |
76 | // fDLine = tpt->GetDLine(); | |
77 | // fPsiLine = tpt->GetPsiLine(); | |
78 | // SetNHits(tpt->GetWeight()); | |
79 | // SetRowRange(tpt->GetFirstRow(),tpt->GetLastRow()); | |
80 | // fIsHelix = false; | |
81 | } | |
82 | ||
d2ef7687 | 83 | Int_t AliHLTTPCHoughTrack::Compare(const AliHLTTPCTrack *tpt) const |
a0cef3e1 | 84 | { |
85 | //Compare 2 hough tracks according to their weight | |
86 | AliHLTTPCHoughTrack *track = (AliHLTTPCHoughTrack*)tpt; | |
87 | if(track->GetWeight() < GetWeight()) return 1; | |
88 | if(track->GetWeight() > GetWeight()) return -1; | |
89 | return 0; | |
90 | } | |
91 | ||
92 | void AliHLTTPCHoughTrack::SetEta(Double_t f) | |
93 | { | |
94 | //Set eta, and calculate fTanl, which is the tan of dipangle | |
95 | ||
96 | fEta = f; | |
97 | Double_t theta = 2*atan(exp(-1.*fEta)); | |
d2ef7687 | 98 | Double_t dipangle = AliHLTTPCTransform::PiHalf() - theta; |
a0cef3e1 | 99 | Double_t tgl = tan(dipangle); |
100 | SetTgl(tgl); | |
101 | } | |
102 | ||
103 | void AliHLTTPCHoughTrack::UpdateToFirstRow() | |
104 | { | |
105 | //Update the track parameters to the point where track cross | |
106 | //its first padrow.` | |
107 | ||
108 | //Get the crossing point with the first padrow: | |
109 | Float_t xyz[3]; | |
110 | if(!GetCrossingPoint(GetFirstRow(),xyz)) | |
d2ef7687 | 111 | LOG(AliHLTTPCLog::kWarning,"AliHLTTPCHoughTrack::UpdateToFirstRow()","Track parameters") |
112 | <<AliHLTTPCLog::kDec<<"Track does not cross padrow "<<GetFirstRow()<<" centerx " | |
a0cef3e1 | 113 | <<GetCenterX()<<" centery "<<GetCenterY()<<" Radius "<<GetRadius()<<" tgl "<<GetTgl()<<ENDLOG; |
114 | ||
115 | //printf("Track with eta %f tgl %f crosses at x %f y %f z %f on padrow %d\n",GetEta(),GetTgl(),xyz[0],xyz[1],xyz[2],GetFirstRow()); | |
116 | //printf("Before: first %f %f %f tgl %f center %f %f charge %d\n",GetFirstPointX(),GetFirstPointY(),GetFirstPointZ(),GetTgl(),GetCenterX(),GetCenterY(),GetCharge()); | |
117 | ||
118 | Double_t radius = sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]); | |
119 | ||
120 | //Get the track parameters | |
121 | ||
122 | /* | |
123 | Double_t x0 = GetR0() * cos(GetPhi0()) ; | |
124 | Double_t y0 = GetR0() * sin(GetPhi0()) ; | |
125 | */ | |
d2ef7687 | 126 | Double_t rc = GetRadius();//fabs(GetPt()) / AliHLTTPCTransform::GetBFieldValue(); |
127 | Double_t tPhi0 = GetPsi() + GetCharge() * AliHLTTPCTransform::PiHalf() / abs(GetCharge()) ; | |
a0cef3e1 | 128 | Double_t xc = GetCenterX();//x0 - rc * cos(tPhi0) ; |
129 | Double_t yc = GetCenterY();//y0 - rc * sin(tPhi0) ; | |
130 | ||
131 | //Check helix and cylinder intersect | |
132 | Double_t fac1 = xc*xc + yc*yc ; | |
133 | Double_t sfac = sqrt( fac1 ) ; | |
134 | ||
135 | if ( fabs(sfac-rc) > radius || fabs(sfac+rc) < radius ) { | |
d2ef7687 | 136 | LOG(AliHLTTPCLog::kError,"AliHLTTPCHoughTrack::UpdateToFirstRow","Tracks")<<AliHLTTPCLog::kDec<< |
a0cef3e1 | 137 | "Track does not intersect"<<ENDLOG; |
138 | return; | |
139 | } | |
140 | ||
141 | //Find intersection | |
142 | Double_t fac2 = (radius*radius + fac1 - rc*rc) / (2.00 * radius * sfac ) ; | |
143 | Double_t phi = atan2(yc,xc) + GetCharge()*acos(fac2) ; | |
144 | Double_t td = atan2(radius*sin(phi) - yc,radius*cos(phi) - xc) ; | |
145 | ||
146 | //Intersection in z | |
d2ef7687 | 147 | if ( td < 0 ) td = td + AliHLTTPCTransform::TwoPi(); |
148 | Double_t deltat = fmod((-GetCharge()*td + GetCharge()*tPhi0),AliHLTTPCTransform::TwoPi()); | |
149 | if ( deltat < 0. ) deltat += AliHLTTPCTransform::TwoPi(); | |
150 | else if ( deltat > AliHLTTPCTransform::TwoPi() ) deltat -= AliHLTTPCTransform::TwoPi(); | |
a0cef3e1 | 151 | Double_t z = GetZ0() + rc * GetTgl() * deltat ; |
152 | ||
153 | Double_t xExtra = radius * cos(phi) ; | |
154 | Double_t yExtra = radius * sin(phi) ; | |
155 | ||
156 | Double_t tPhi = atan2(yExtra-yc,xExtra-xc); | |
157 | ||
158 | //if ( tPhi < 0 ) tPhi += 2. * M_PI ; | |
d2ef7687 | 159 | Double_t tPsi = tPhi - GetCharge() * AliHLTTPCTransform::PiHalf() / abs(GetCharge()) ; |
160 | if ( tPsi > AliHLTTPCTransform::TwoPi() ) tPsi -= AliHLTTPCTransform::TwoPi() ; | |
161 | else if ( tPsi < 0. ) tPsi += AliHLTTPCTransform::TwoPi(); | |
a0cef3e1 | 162 | |
163 | //And finally, update the track parameters | |
164 | SetR0(radius); | |
165 | SetPhi0(phi); | |
166 | SetZ0(z); | |
167 | SetPsi(tPsi); | |
168 | SetFirstPoint(xyz[0],xyz[1],z); | |
169 | //printf("After: first %f %f %f tgl %f center %f %f charge %d\n",GetFirstPointX(),GetFirstPointY(),GetFirstPointZ(),GetTgl(),GetCenterX(),GetCenterY(),GetCharge()); | |
170 | ||
171 | //printf("First point set %f %f %f\n",xyz[0],xyz[1],z); | |
172 | ||
173 | //Also, set the coordinates of the point where track crosses last padrow: | |
174 | GetCrossingPoint(GetLastRow(),xyz); | |
175 | SetLastPoint(xyz[0],xyz[1],xyz[2]); | |
176 | //printf("last point %f %f %f\n",xyz[0],xyz[1],xyz[2]); | |
177 | } | |
178 | ||
179 | void AliHLTTPCHoughTrack::SetTrackParameters(Double_t kappa,Double_t eangle,Int_t weight) | |
180 | { | |
181 | //Set track parameters - sort of ctor | |
182 | fWeight = weight; | |
183 | fMinDist = 100000; | |
184 | SetKappa(kappa); | |
d2ef7687 | 185 | Double_t pt = fabs(AliHLTTPCTransform::GetBFieldValue()/kappa); |
a0cef3e1 | 186 | SetPt(pt); |
187 | Double_t radius = 1/fabs(kappa); | |
188 | SetRadius(radius); | |
189 | SetFirstPoint(0,0,0); | |
190 | SetPsi(eangle); //Psi = emission angle when first point is vertex | |
191 | SetPhi0(0); //not defined for vertex reference point | |
192 | SetR0(0); | |
193 | Double_t charge = -1.*kappa; | |
194 | SetCharge((Int_t)copysign(1.,charge)); | |
d2ef7687 | 195 | Double_t trackPhi0 = GetPsi() + charge*0.5*AliHLTTPCTransform::Pi()/fabs(charge); |
a0cef3e1 | 196 | Double_t xc = GetFirstPointX() - GetRadius() * cos(trackPhi0) ; |
197 | Double_t yc = GetFirstPointY() - GetRadius() * sin(trackPhi0) ; | |
198 | SetCenterX(xc); | |
199 | SetCenterY(yc); | |
200 | SetNHits(1); //just for the trackarray IO | |
201 | fIsHelix = true; | |
202 | } | |
203 | ||
204 | void AliHLTTPCHoughTrack::SetTrackParametersRow(Double_t alpha1,Double_t alpha2,Double_t eta,Int_t weight) | |
205 | { | |
206 | //Set track parameters for HoughTransformerRow | |
207 | //This includes curvature,emission angle and eta | |
d2ef7687 | 208 | Double_t psi = atan((alpha1-alpha2)/(AliHLTTPCHoughTransformerRow::GetBeta1()-AliHLTTPCHoughTransformerRow::GetBeta2())); |
209 | Double_t kappa = 2.0*(alpha1*cos(psi)-AliHLTTPCHoughTransformerRow::GetBeta1()*sin(psi)); | |
a0cef3e1 | 210 | SetTrackParameters(kappa,psi,weight); |
211 | ||
212 | Double_t zovr; | |
d2ef7687 | 213 | Double_t etaparam1 = AliHLTTPCHoughTransformerRow::GetEtaCalcParam1(); |
214 | Double_t etaparam2 = AliHLTTPCHoughTransformerRow::GetEtaCalcParam2(); | |
a0cef3e1 | 215 | if(eta>0) |
216 | zovr = (etaparam1 - sqrt(etaparam1*etaparam1 - 4.*etaparam2*eta))/(2.*etaparam2); | |
217 | else | |
218 | zovr = -1.*(etaparam1 - sqrt(etaparam1*etaparam1 + 4.*etaparam2*eta))/(2.*etaparam2); | |
219 | Double_t r = sqrt(1.+zovr*zovr); | |
220 | Double_t exacteta = 0.5*log((1+zovr/r)/(1-zovr/r)); | |
221 | SetEta(exacteta); | |
222 | } | |
223 | ||
224 | void AliHLTTPCHoughTrack::SetLineParameters(Double_t psi,Double_t D,Int_t weight,Int_t *rowrange,Int_t /*ref_row*/) | |
225 | { | |
226 | //Initialize a track piece, not yet a track | |
227 | //Used in case of straight line transformation | |
228 | ||
229 | //Transform line parameters to coordinate system of slice: | |
230 | ||
231 | // D = D + fTransform->Row2X(ref_row)*cos(psi); | |
232 | ||
233 | fDLine = D; | |
234 | fPsiLine = psi; | |
235 | fWeight = weight; | |
236 | SetNHits(1); | |
237 | SetRowRange(rowrange[0],rowrange[1]); | |
238 | fIsHelix = false; | |
239 | } | |
240 | ||
241 | void AliHLTTPCHoughTrack::SetBestMCid(Int_t mcid,Double_t mindist) | |
242 | { | |
243 | //Finds and set the closest mc label | |
244 | if(mindist < fMinDist) | |
245 | { | |
246 | fMinDist = mindist; | |
247 | SetMCid(mcid); | |
248 | } | |
249 | } | |
250 | ||
251 | void AliHLTTPCHoughTrack::GetLineCrossingPoint(Int_t padrow,Float_t *xy) | |
252 | { | |
253 | //Returns the crossing point of the track with a given padrow | |
254 | if(fIsHelix) | |
255 | { | |
256 | printf("AliHLTTPCHoughTrack::GetLineCrossingPoint : Track is not a line\n"); | |
257 | return; | |
258 | } | |
259 | ||
d2ef7687 | 260 | Float_t xhit = AliHLTTPCTransform::Row2X(padrow) - AliHLTTPCTransform::Row2X(GetFirstRow()); |
a0cef3e1 | 261 | Float_t a = -1/tan(fPsiLine); |
262 | Float_t b = fDLine/sin(fPsiLine); | |
263 | Float_t yhit = a*xhit + b; | |
264 | xy[0] = xhit; | |
265 | xy[1] = yhit; | |
266 | } |