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108615fc | 1 | //Author: Anders Strand Vestbo |
2 | ||
3 | //________________________________ | |
4 | // AliL3ConfMapPoint | |
5 | // | |
6 | // Hit class for conformal mapper | |
7 | ||
8 | #include <iostream.h> | |
9 | #include <math.h> | |
10 | #include "AliL3Logging.h" | |
11 | ||
12 | #include "AliL3ConfMapPoint.h" | |
13 | #include "AliL3SpacePointData.h" | |
14 | #include "AliL3Vertex.h" | |
15 | #include "AliL3ConfMapTrack.h" | |
16 | ||
17 | //ClassImp(AliL3ConfMapPoint) | |
18 | ||
19 | AliL3ConfMapPoint::AliL3ConfMapPoint() | |
20 | { | |
21 | //Constructor | |
22 | ||
23 | SetUsage(false); | |
24 | SetHitNumber(-1); | |
25 | SetX(0); | |
26 | SetY(0); | |
27 | SetZ(0); | |
28 | SetXerr(0); | |
29 | SetYerr(0); | |
30 | SetZerr(0); | |
31 | ||
32 | SetPhi(0.); | |
33 | SetEta(0.); | |
34 | ||
35 | SetXprime(0.); | |
36 | SetYprime(0.); | |
37 | SetXprimeerr(0.); | |
38 | SetYprimeerr(0.); | |
39 | SetIntPoint(0., 0., 0., 0., 0., 0.); | |
40 | SetShiftedCoord(); | |
5dd30052 | 41 | SetMCTrackID(0,0,0); |
108615fc | 42 | } |
43 | ||
44 | AliL3ConfMapPoint::~AliL3ConfMapPoint() | |
45 | { | |
46 | // Destructor. | |
47 | // Does nothing except destruct. | |
48 | } | |
49 | ||
50 | Bool_t AliL3ConfMapPoint::ReadHits(AliL3SpacePointData* hits ){ | |
51 | SetHitNumber(hits->fID); | |
52 | SetPadRow(hits->fPadRow); | |
53 | Int_t slice = (hits->fID>>25) & 0x7f; | |
54 | SetSector(slice); | |
55 | SetX(hits->fX); | |
56 | SetY(hits->fY); | |
57 | SetZ(hits->fZ); | |
58 | SetXerr(sqrt(hits->fXYErr)); | |
59 | SetYerr(sqrt(hits->fXYErr)); | |
60 | SetZerr(sqrt(hits->fZErr)); | |
61 | return kTRUE; | |
62 | } | |
63 | ||
64 | void AliL3ConfMapPoint::Setup(AliL3Vertex *vertex) | |
65 | { | |
66 | //Setup. Sets the vertex, conformal coordinates, and phi and eta of each hit. | |
67 | ||
68 | SetIntPoint(vertex->GetX(), vertex->GetY(), vertex->GetZ(), | |
69 | vertex->GetXErr(), vertex->GetYErr(), vertex->GetZErr()); | |
70 | SetShiftedCoord(); | |
71 | SetConfCoord(); | |
72 | // The angles are set properly if they are set after the interaction point and the shifted coordinates | |
73 | SetAngles(); | |
74 | //SetDist(0., 0.); | |
75 | ||
76 | return; | |
77 | } | |
78 | ||
79 | void AliL3ConfMapPoint::SetIntPoint(const Double_t in_x,const Double_t in_y, | |
80 | const Double_t in_z, | |
81 | const Double_t in_x_err, const Double_t in_y_err, | |
82 | const Double_t in_z_err) | |
83 | { | |
84 | // Defines a new interaction point. This point is needed to calculate | |
85 | // the conformal coordinates. | |
86 | ||
87 | SetXt(in_x); | |
88 | SetYt(in_y); | |
89 | SetZt(in_z); | |
90 | SetXterr(in_x_err); | |
91 | SetYterr(in_y_err); | |
92 | SetZterr(in_z_err); | |
93 | ||
94 | return; | |
95 | } | |
96 | ||
97 | void AliL3ConfMapPoint::SetAllCoord(const AliL3ConfMapPoint *preceding_hit) | |
98 | { | |
99 | // Sets the interaction point, the shifted coordinates, and the conformal mapping coordinates. | |
100 | // These values are calculated from the interaction point of the given cluster which should be a | |
101 | // already found cluster on the same track. | |
102 | ||
103 | if (this == preceding_hit) { | |
104 | SetIntPoint(preceding_hit->GetX(), preceding_hit->GetY(), preceding_hit->GetZ(), | |
105 | preceding_hit->GetXerr(), preceding_hit->GetYerr(), preceding_hit->GetZerr()); | |
106 | } | |
107 | ||
108 | else { | |
109 | SetIntPoint(preceding_hit->GetXt(), preceding_hit->GetYt(), preceding_hit->GetZt(), | |
110 | preceding_hit->GetXterr(), preceding_hit->GetYterr(), preceding_hit->GetZterr()); | |
111 | } | |
112 | ||
113 | SetShiftedCoord(); | |
114 | SetConfCoord(); | |
115 | ||
116 | return; | |
117 | } | |
118 | ||
119 | void AliL3ConfMapPoint::SetShiftedCoord() | |
120 | { | |
121 | // Sets the coordinates with resepct to the given vertex point | |
122 | ||
123 | SetXv(GetX() - fXt); | |
124 | SetYv(GetY() - fYt); | |
125 | SetZv(GetZ() - fZt); | |
126 | /* | |
127 | SetXverr(TMath::Sqrt(GetXerr()*GetXerr() + fXterr*fXterr)); | |
128 | SetYverr(TMath::Sqrt(GetYerr()*GetYerr() + fYterr*fYterr)); | |
129 | SetZverr(TMath::Sqrt(GetZerr()*GetZerr() + fZterr*fZterr)); | |
130 | */ | |
131 | return; | |
132 | } | |
133 | ||
134 | void AliL3ConfMapPoint::SetConfCoord() | |
135 | { | |
136 | // Calculates the conformal coordinates of one cluster. | |
137 | // If the option "vertex_constraint" applies the interaction point is | |
138 | // assumed to be at (0, 0, 0). Otherwise the function will use the | |
139 | // interaction point specified by fXt and fYt. | |
140 | ||
141 | Double_t r2; | |
142 | Double_t xyErrorScale = 1; | |
143 | Double_t szErrorScale = 1; | |
144 | ||
145 | if ((r2 = fXv*fXv + fYv*fYv)) | |
146 | { | |
147 | fXprime = fXv / r2; | |
148 | fYprime = -fYv / r2; | |
149 | // fXprimeerr = TMath::Sqrt(TMath::Power((-fXv * fXv + fYv*fYv) * fXverr, 2) + TMath::Power( 2*fXv*fYv*fYverr, 2)) / TMath::Power(fXv*fXv + fYv*fYv, 2); | |
150 | // fXprimeerr = TMath::Sqrt(TMath::Power((-fXv * fXv - 3*fYv*fYv) * fYverr, 2) + TMath::Power(-2*fXv*fYv*fXverr, 2)) / TMath::Power(fXv*fXv + fYv*fYv, 2); | |
151 | ||
152 | ||
153 | //set weights: | |
154 | //fWxy = r2*r2 / (TMath::Power(xyErrorScale,2)*(TMath::Power(xerr,2)+TMath::Power(yerr,2))); | |
155 | fWxy = r2*r2 / ((xyErrorScale*xyErrorScale)*((xerr*xerr)+(yerr*yerr))); | |
156 | s = 0; //track trajectory | |
157 | //fWz = (Double_t)(1./TMath::Power(szErrorScale*zerr,2)); | |
158 | fWz = (Double_t)(1./(szErrorScale*zerr*zerr)); | |
159 | } | |
160 | ||
161 | else { | |
162 | fXprime = 0.; | |
163 | fYprime = 0.; | |
164 | fXprimeerr = 0.; | |
165 | fYprimeerr = 0.; | |
166 | fWxy = 0; | |
167 | fWz = 0; | |
168 | s = 0; | |
169 | } | |
170 | ||
171 | return; | |
172 | } | |
173 | ||
174 | void AliL3ConfMapPoint::SetAngles() | |
175 | { | |
176 | // Calculates the angle phi and the pseudorapidity eta for each cluster. | |
177 | /* | |
178 | Double_t r = TMath::Sqrt(x*x + y*y); | |
179 | ||
180 | fPhi = TMath::ATan2(y,x); | |
181 | if(fPhi<0) fPhi = fPhi + 2*TMath::Pi(); | |
182 | fEta = 3.*z/(TMath::Abs(z)+2.*r); | |
183 | return; | |
184 | */ | |
185 | // Double_t r3dim = TMath::Sqrt(fXv*fXv + fYv*fYv + fZv*fZv); | |
186 | Double_t r3dim = sqrt(fXv*fXv + fYv*fYv + fZv*fZv); | |
187 | //Double_t r2dim = TMath::Sqrt(fXv*fXv + fYv*fYv); | |
188 | ||
189 | /*if (r2dim == 0.) { | |
190 | // If r2dim == 0 the pseudorapidity eta cannot be calculated (division by zero)! | |
191 | // This can only happen if the point is lying on the z-axis and this should never be possible. | |
192 | cerr << "The pseudorapidity eta cannot be calculated (division by zero)! Set to 1.e-10." << endl; | |
193 | r2dim = 1.e-10; | |
194 | } | |
195 | ||
196 | if (fXv == 0.) { | |
197 | fPhi = (fYv > 0.) ? TMath::Pi() / 2. : - TMath::Pi() / 2.; | |
198 | } | |
199 | ||
200 | else { | |
201 | fPhi = (fXv > 0.) ? TMath::ASin(fYv/r2dim) : TMath::Pi() - TMath::ASin(fYv/r2dim); | |
202 | } | |
203 | ||
204 | if (fPhi < 0.) { | |
205 | fPhi += 2. * TMath::Pi(); | |
206 | } | |
207 | */ | |
208 | //fPhi = TMath::ATan2(y,x); | |
209 | fPhi = atan2(y,x); | |
210 | //if(fPhi<0) fPhi = fPhi + 2*TMath::Pi(); | |
211 | ||
212 | //fEta = 0.5 * TMath::Log((r3dim + fZv)/(r3dim - fZv)); | |
213 | fEta = 0.5 * log((r3dim + fZv)/(r3dim - fZv)); | |
214 | return; | |
215 | } | |
216 | /* | |
217 | AliL3ConfMapTrack *AliL3ConfMapPoint::GetTrack(TClonesArray *tracks) const | |
218 | { | |
219 | // Returns the pointer to the track to which this hit belongs. | |
220 | ||
221 | return (AliL3ConfMapTrack*)tracks->At(this->GetTrackNumber()); | |
222 | } | |
223 | */ |