]>
Commit | Line | Data |
---|---|---|
3e87ef69 | 1 | // @(#) $Id$ |
b1886074 | 2 | |
3 | // Author: Anders Vestbo <mailto:vestbo@fi.uib.no> | |
3e87ef69 | 4 | //*-- Copyright © ALICE HLT Group |
d712b5b8 | 5 | |
e06900d5 | 6 | #include "AliL3StandardIncludes.h" |
d712b5b8 | 7 | |
8 | #include "AliL3Logging.h" | |
de3c3890 | 9 | #include "AliL3Track.h" |
d712b5b8 | 10 | #include "AliL3HoughTrack.h" |
13a0c3d8 | 11 | #include "AliL3Transform.h" |
f644512a | 12 | #include "AliL3HoughTransformerRow.h" |
d712b5b8 | 13 | |
0bd0c1ef | 14 | #if __GNUC__ == 3 |
e06900d5 | 15 | using namespace std; |
16 | #endif | |
17 | ||
0bd0c1ef | 18 | /** \class AliL3HoughTrack |
19 | <pre> | |
b1886074 | 20 | //_____________________________________________________________ |
21 | // AliL3HoughTrack | |
22 | // | |
23 | // Track class for Hough tracklets | |
0bd0c1ef | 24 | // |
25 | </pre> | |
26 | */ | |
b1886074 | 27 | |
d712b5b8 | 28 | ClassImp(AliL3HoughTrack) |
29 | ||
30 | ||
de3c3890 | 31 | AliL3HoughTrack::AliL3HoughTrack() : AliL3Track() |
d712b5b8 | 32 | { |
33 | //Constructor | |
34 | ||
35 | fWeight = 0; | |
36 | fMinDist=0; | |
d712b5b8 | 37 | fDLine = 0; |
38 | fPsiLine = 0; | |
39 | fIsHelix = true; | |
40 | fEtaIndex = -1; | |
208b54c5 | 41 | fEta = 0; |
de3c3890 | 42 | ComesFromMainVertex(kTRUE); |
d712b5b8 | 43 | } |
44 | ||
d712b5b8 | 45 | AliL3HoughTrack::~AliL3HoughTrack() |
46 | { | |
bd2f8772 | 47 | //dtor |
d712b5b8 | 48 | } |
49 | ||
50 | void AliL3HoughTrack::Set(AliL3Track *track) | |
51 | { | |
bd2f8772 | 52 | //Basically copy constructor |
d712b5b8 | 53 | AliL3HoughTrack *tpt = (AliL3HoughTrack*)track; |
b46b53c1 | 54 | SetTrackParameters(tpt->GetKappa(),tpt->GetPsi(),tpt->GetWeight()); |
d712b5b8 | 55 | SetEtaIndex(tpt->GetEtaIndex()); |
56 | SetEta(tpt->GetEta()); | |
ae4d5136 | 57 | SetTgl(tpt->GetTgl()); |
d712b5b8 | 58 | SetPsi(tpt->GetPsi()); |
f644512a | 59 | SetPterr(tpt->GetPterr()); |
60 | SetTglerr(tpt->GetTglerr()); | |
61 | SetPsierr(tpt->GetPsierr()); | |
d712b5b8 | 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()); | |
b1886074 | 68 | SetSlice(tpt->GetSlice()); |
3e87ef69 | 69 | SetHits(tpt->GetNHits(),(UInt_t *)tpt->GetHitNumbers()); |
0bd0c1ef | 70 | SetMCid(tpt->GetMCid()); |
de3c3890 | 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; | |
d712b5b8 | 81 | } |
82 | ||
83 | Int_t AliL3HoughTrack::Compare(const AliL3Track *tpt) const | |
84 | { | |
bd2f8772 | 85 | //Compare 2 hough tracks according to their weight |
d712b5b8 | 86 | AliL3HoughTrack *track = (AliL3HoughTrack*)tpt; |
87 | if(track->GetWeight() < GetWeight()) return 1; | |
88 | if(track->GetWeight() > GetWeight()) return -1; | |
89 | return 0; | |
90 | } | |
91 | ||
92 | void AliL3HoughTrack::SetEta(Double_t f) | |
93 | { | |
b1886074 | 94 | //Set eta, and calculate fTanl, which is the tan of dipangle |
95 | ||
d712b5b8 | 96 | fEta = f; |
97 | Double_t theta = 2*atan(exp(-1.*fEta)); | |
5a31e9df | 98 | Double_t dipangle = AliL3Transform::PiHalf() - theta; |
8b007a2d | 99 | Double_t tgl = tan(dipangle); |
d712b5b8 | 100 | SetTgl(tgl); |
101 | } | |
102 | ||
d712b5b8 | 103 | void AliL3HoughTrack::UpdateToFirstRow() |
104 | { | |
105 | //Update the track parameters to the point where track cross | |
5a31e9df | 106 | //its first padrow.` |
d712b5b8 | 107 | |
108 | //Get the crossing point with the first padrow: | |
109 | Float_t xyz[3]; | |
110 | if(!GetCrossingPoint(GetFirstRow(),xyz)) | |
111 | LOG(AliL3Log::kWarning,"AliL3HoughTrack::UpdateToFirstRow()","Track parameters") | |
112 | <<AliL3Log::kDec<<"Track does not cross padrow "<<GetFirstRow()<<" centerx " | |
113 | <<GetCenterX()<<" centery "<<GetCenterY()<<" Radius "<<GetRadius()<<" tgl "<<GetTgl()<<ENDLOG; | |
114 | ||
8b007a2d | 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 | ||
d712b5b8 | 118 | Double_t radius = sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]); |
119 | ||
120 | //Get the track parameters | |
b1886074 | 121 | |
122 | /* | |
123 | Double_t x0 = GetR0() * cos(GetPhi0()) ; | |
124 | Double_t y0 = GetR0() * sin(GetPhi0()) ; | |
125 | */ | |
5a31e9df | 126 | Double_t rc = GetRadius();//fabs(GetPt()) / AliL3Transform::GetBFieldValue(); |
127 | Double_t tPhi0 = GetPsi() + GetCharge() * AliL3Transform::PiHalf() / abs(GetCharge()) ; | |
b1886074 | 128 | Double_t xc = GetCenterX();//x0 - rc * cos(tPhi0) ; |
129 | Double_t yc = GetCenterY();//y0 - rc * sin(tPhi0) ; | |
d712b5b8 | 130 | |
131 | //Check helix and cylinder intersect | |
132 | Double_t fac1 = xc*xc + yc*yc ; | |
133 | Double_t sfac = sqrt( fac1 ) ; | |
b1886074 | 134 | |
d712b5b8 | 135 | if ( fabs(sfac-rc) > radius || fabs(sfac+rc) < radius ) { |
136 | LOG(AliL3Log::kError,"AliL3HoughTrack::UpdateToFirstRow","Tracks")<<AliL3Log::kDec<< | |
137 | "Track does not intersect"<<ENDLOG; | |
138 | return; | |
139 | } | |
140 | ||
141 | //Find intersection | |
b46b53c1 | 142 | Double_t fac2 = (radius*radius + fac1 - rc*rc) / (2.00 * radius * sfac ) ; |
d712b5b8 | 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 | |
5a31e9df | 147 | if ( td < 0 ) td = td + AliL3Transform::TwoPi(); |
148 | Double_t deltat = fmod((-GetCharge()*td + GetCharge()*tPhi0),AliL3Transform::TwoPi()); | |
149 | if ( deltat < 0. ) deltat += AliL3Transform::TwoPi(); | |
150 | else if ( deltat > AliL3Transform::TwoPi() ) deltat -= AliL3Transform::TwoPi(); | |
d712b5b8 | 151 | Double_t z = GetZ0() + rc * GetTgl() * deltat ; |
8b007a2d | 152 | |
d712b5b8 | 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 ; | |
5a31e9df | 159 | Double_t tPsi = tPhi - GetCharge() * AliL3Transform::PiHalf() / abs(GetCharge()) ; |
160 | if ( tPsi > AliL3Transform::TwoPi() ) tPsi -= AliL3Transform::TwoPi() ; | |
161 | else if ( tPsi < 0. ) tPsi += AliL3Transform::TwoPi(); | |
d712b5b8 | 162 | |
163 | //And finally, update the track parameters | |
d712b5b8 | 164 | SetR0(radius); |
165 | SetPhi0(phi); | |
166 | SetZ0(z); | |
167 | SetPsi(tPsi); | |
168 | SetFirstPoint(xyz[0],xyz[1],z); | |
8b007a2d | 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); | |
d712b5b8 | 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]); | |
8b007a2d | 176 | //printf("last point %f %f %f\n",xyz[0],xyz[1],xyz[2]); |
d712b5b8 | 177 | } |
178 | ||
b46b53c1 | 179 | void AliL3HoughTrack::SetTrackParameters(Double_t kappa,Double_t eangle,Int_t weight) |
d712b5b8 | 180 | { |
bd2f8772 | 181 | //Set track parameters - sort of ctor |
d712b5b8 | 182 | fWeight = weight; |
183 | fMinDist = 100000; | |
184 | SetKappa(kappa); | |
5a31e9df | 185 | Double_t pt = fabs(AliL3Transform::GetBFieldValue()/kappa); |
d712b5b8 | 186 | SetPt(pt); |
187 | Double_t radius = 1/fabs(kappa); | |
188 | SetRadius(radius); | |
189 | SetFirstPoint(0,0,0); | |
b46b53c1 | 190 | SetPsi(eangle); //Psi = emission angle when first point is vertex |
191 | SetPhi0(0); //not defined for vertex reference point | |
8b007a2d | 192 | SetR0(0); |
d712b5b8 | 193 | Double_t charge = -1.*kappa; |
8b007a2d | 194 | SetCharge((Int_t)copysign(1.,charge)); |
26abc209 | 195 | Double_t trackPhi0 = GetPsi() + charge*0.5*AliL3Transform::Pi()/fabs(charge); |
8b007a2d | 196 | Double_t xc = GetFirstPointX() - GetRadius() * cos(trackPhi0) ; |
197 | Double_t yc = GetFirstPointY() - GetRadius() * sin(trackPhi0) ; | |
d712b5b8 | 198 | SetCenterX(xc); |
199 | SetCenterY(yc); | |
242c143e | 200 | SetNHits(1); //just for the trackarray IO |
d712b5b8 | 201 | fIsHelix = true; |
202 | } | |
203 | ||
f644512a | 204 | void AliL3HoughTrack::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 | |
208 | Double_t psi = atan((alpha1-alpha2)/(AliL3HoughTransformerRow::GetBeta1()-AliL3HoughTransformerRow::GetBeta2())); | |
209 | Double_t kappa = 2.0*(alpha1*cos(psi)-AliL3HoughTransformerRow::GetBeta1()*sin(psi)); | |
210 | SetTrackParameters(kappa,psi,weight); | |
211 | ||
212 | Double_t zovr; | |
213 | Double_t etaparam1 = AliL3HoughTransformerRow::GetEtaCalcParam1(); | |
214 | Double_t etaparam2 = AliL3HoughTransformerRow::GetEtaCalcParam2(); | |
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 | ||
dd7d3870 | 224 | void AliL3HoughTrack::SetLineParameters(Double_t psi,Double_t D,Int_t weight,Int_t *rowrange,Int_t /*ref_row*/) |
d712b5b8 | 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 | ||
3e87ef69 | 231 | // D = D + fTransform->Row2X(ref_row)*cos(psi); |
d712b5b8 | 232 | |
233 | fDLine = D; | |
234 | fPsiLine = psi; | |
235 | fWeight = weight; | |
3e87ef69 | 236 | SetNHits(1); |
d712b5b8 | 237 | SetRowRange(rowrange[0],rowrange[1]); |
238 | fIsHelix = false; | |
d712b5b8 | 239 | } |
240 | ||
bd2f8772 | 241 | void AliL3HoughTrack::SetBestMCid(Int_t mcid,Double_t mindist) |
d712b5b8 | 242 | { |
bd2f8772 | 243 | //Finds and set the closest mc label |
244 | if(mindist < fMinDist) | |
d712b5b8 | 245 | { |
bd2f8772 | 246 | fMinDist = mindist; |
d712b5b8 | 247 | SetMCid(mcid); |
248 | } | |
d712b5b8 | 249 | } |
250 | ||
3e87ef69 | 251 | void AliL3HoughTrack::GetLineCrossingPoint(Int_t padrow,Float_t *xy) |
d712b5b8 | 252 | { |
bd2f8772 | 253 | //Returns the crossing point of the track with a given padrow |
d712b5b8 | 254 | if(fIsHelix) |
255 | { | |
256 | printf("AliL3HoughTrack::GetLineCrossingPoint : Track is not a line\n"); | |
257 | return; | |
258 | } | |
259 | ||
3e87ef69 | 260 | Float_t xhit = AliL3Transform::Row2X(padrow) - AliL3Transform::Row2X(GetFirstRow()); |
261 | Float_t a = -1/tan(fPsiLine); | |
262 | Float_t b = fDLine/sin(fPsiLine); | |
263 | Float_t yhit = a*xhit + b; | |
d712b5b8 | 264 | xy[0] = xhit; |
265 | xy[1] = yhit; | |
d712b5b8 | 266 | } |