Remove obsolete macro
[u/mrichter/AliRoot.git] / TPC / AliTPCTransform.cxx
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022ee144 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16//-------------------------------------------------------
17// Implementation of the TPC transformation class
18//
19// Origin: Marian Ivanov Marian.Ivanov@cern.ch
20// Magnus Mager
21//
22// Class for tranformation of the coordinate frame
66954e3f 23// Transformation
022ee144 24// local coordinate frame (sector, padrow, pad, timebine) ==>
25// rotated global (tracking) cooridnate frame (sector, lx,ly,lz)
26//
27// Unisochronity - (substract time0 - pad by pad)
28// Drift velocity - Currently common drift velocity - functionality of AliTPCParam
29// ExB effect -
30//
31// Usage:
32// AliTPCclustererMI::AddCluster
33// AliTPCtrackerMI::Transform
34//
35//-------------------------------------------------------
c1bdda91 36
37/* To test it:
38 cdb=AliCDBManager::Instance()
39 cdb->SetDefaultStorage("local:///u/mmager/mycalib1")
40 c=AliTPCcalibDB::Instance()
41 c->SetRun(0)
42 Double_t x[]={1.0,2.0,3.0}
43 Int_t i[]={4}
44 AliTPCTransform trafo
45 trafo.Transform(x,i,0,1)
46 */
47
022ee144 48/* $Id$ */
49
50#include "AliTPCROC.h"
51#include "AliTPCCalPad.h"
52#include "AliTPCCalROC.h"
53#include "AliTPCcalibDB.h"
54#include "AliTPCParam.h"
55#include "TMath.h"
56#include "AliLog.h"
57#include "AliTPCExB.h"
66954e3f 58#include "TGeoMatrix.h"
022ee144 59#include "AliTPCTransform.h"
60
66954e3f 61ClassImp(AliTPCTransform)
022ee144 62
63
c1bdda91 64AliTPCTransform::AliTPCTransform() {
24db6af7 65 //
c1bdda91 66 // Speed it up a bit!
24db6af7 67 //
c1bdda91 68 for (Int_t i=0;i<18;++i) {
69 Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
70 fSins[i]=TMath::Sin(alpha);
71 fCoss[i]=TMath::Cos(alpha);
72 }
73}
74
75AliTPCTransform::~AliTPCTransform() {
24db6af7 76 //
77 // Destructor
78 //
c1bdda91 79}
80
24db6af7 81void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/,
ecc5dd8f 82 Int_t /*coordinateType*/, Float_t *primvtx) {
24db6af7 83 // input: x[0] - pad row
84 // x[1] - pad
c1bdda91 85 // x[2] - time in us
86 // i[0] - sector
87 // output: x[0] - x (all in the rotated global coordinate frame)
88 // x[1] - y
89 // x[2] - z
ecc5dd8f 90 //
91 // primvtx - position of the primary vertex
92 // used for the TOF correction
93 // TOF of particle calculated assuming the speed-of-light and
94 // line approximation
95 //
96
97
24db6af7 98 Int_t row=TMath::Nint(x[0]);
99 Int_t pad=TMath::Nint(x[1]);
c1bdda91 100 Int_t sector=i[0];
66954e3f 101 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
24db6af7 102 //
103 AliTPCCalPad * time0TPC = calib->GetPadTime0();
104 AliTPCParam * param = calib->GetParameters();
105 if (!time0TPC){
106 AliFatal("Time unisochronity missing");
107 }
c1bdda91 108
24db6af7 109 if (!param){
110 AliFatal("Parameters missing");
111 }
c1bdda91 112
24db6af7 113 Double_t xx[3];
114 // Apply Time0 correction - Pad by pad fluctuation
115 //
116 x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
117 //
118 // Tranform from pad - time coordinate system to the rotated global (tracking) system
119 //
120 Local2RotatedGlobal(sector,x);
121 //
122 //
123 //
c1bdda91 124 // Alignment
125 //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
c1bdda91 126 RotatedGlobal2Global(sector,x);
24db6af7 127 //
128 //
129 // ExB correction
130 //
c1bdda91 131 calib->GetExB()->Correct(x,xx);
ecc5dd8f 132 //
133 // Time of flight correction
134 //
135 Float_t deltaDr =0
136 if (primvtx){
137 Float_t dist=0;
138 dist+=(primvtx[0]-x[0])*(primvtx[0]-x[0]);
139 dist+=(primvtx[1]-x[1])*(primvtx[1]-x[1]);
140 dist+=(primvtx[0]-x[2])*(primvtx[0]-x[2]);
141 dist = TMath::Sqrt(dist);
142 // drift length correction because of TOF
143 // the drift velocity is in cm/s therefore multiplication by 0.01
144 deltaDr = (dist*(0.01*param->GetDriftV()))/TMath::C();
145 }
146 xx[2]-=deltaDr;
147 //
c1bdda91 148 Global2RotatedGlobal(sector,xx);
149
150 x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
151}
152
24db6af7 153void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
154 //
155 //
022ee144 156 // Tranform coordinate from
157 // row, pad, time to x,y,z
24db6af7 158 //
022ee144 159 // Drift Velocity
160 // Current implementation - common drift velocity - for full chamber
24db6af7 161 // TODO: use a map or parametrisation!
162 //
163 //
164 //
66954e3f 165 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
24db6af7 166 AliTPCParam * param = calib->GetParameters();
167 if (!param){
168 AliFatal("Parameters missing");
169 }
170 Int_t row=TMath::Nint(x[0]);
171 Int_t pad=TMath::Nint(x[1]);
172 //
173 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
174 Double_t sign = 1.;
175 Double_t zwidth = param->GetZWidth();
176 Double_t padWidth = 0;
177 Double_t padLength = 0;
178 Double_t maxPad = 0;
179 //
180 if (sector < kNIS) {
181 maxPad = param->GetNPadsLow(row);
182 sign = (sector < kNIS/2) ? 1 : -1;
183 padLength = param->GetPadPitchLength(sector,row);
184 padWidth = param->GetPadPitchWidth(sector);
185 } else {
186 maxPad = param->GetNPadsUp(row);
187 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
188 padLength = param->GetPadPitchLength(sector,row);
189 padWidth = param->GetPadPitchWidth(sector);
190 }
191 //
192 // X coordinate
022ee144 193 x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal
24db6af7 194 //
195 // Y coordinate
196 //
197 x[1]=(x[1]-0.5*maxPad)*padWidth;
24db6af7 198 //
199 // Z coordinate
200 //
201 x[2]*= zwidth; // tranform time bin to the distance to the ROC
202 x[2]-= 3.*param->GetZSigma() + param->GetNTBinsL1()*zwidth;
203 // subtract the time offsets
204 x[2] = sign*( param->GetZLength(sector) - x[2]);
c1bdda91 205}
206
24db6af7 207inline void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
208 //
209 // transform possition rotated global to the global
210 //
c1bdda91 211 Double_t cos,sin;
212 GetCosAndSin(sector,cos,sin);
213 Double_t tmp=x[0];
214 x[0]= cos*tmp+sin*x[1];
215 x[1]=-sin*tmp+cos*x[1];
216}
217
24db6af7 218inline void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
219 //
220 // tranform possition Global2RotatedGlobal
221 //
c1bdda91 222 Double_t cos,sin;
223 GetCosAndSin(sector,cos,sin);
224 Double_t tmp=x[0];
225 x[0]= cos*tmp-sin*x[1];
226 x[1]= sin*tmp+cos*x[1];
227}
228
229inline void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
230 Double_t &sin) const {
231 cos=fCoss[sector%18];
232 sin=fSins[sector%18];
233}
234
c1bdda91 235