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a918d77a | 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 | **************************************************************************/ | |
638f6e9b | 15 | //-----------------------------------------------------// |
16 | // // | |
17 | // // | |
18 | // Date : August 05 2003 // | |
19 | // // | |
20 | // Utility code for ALICE-PMD // | |
21 | // // | |
22 | //-----------------------------------------------------// | |
23 | ||
a918d77a | 24 | #include "Riostream.h" |
638f6e9b | 25 | #include "AliPMDUtility.h" |
26 | #include "TMath.h" | |
27 | #include <stdio.h> | |
a918d77a | 28 | #include <math.h> |
29 | ||
638f6e9b | 30 | |
31 | ClassImp(AliPMDUtility) | |
32 | ||
33 | AliPMDUtility::AliPMDUtility() | |
34 | { | |
a918d77a | 35 | // Default constructor |
638f6e9b | 36 | fPx = 0.; |
37 | fPy = 0.; | |
38 | fPz = 0.; | |
39 | fTheta = 0.; | |
40 | fEta = 0.; | |
41 | fPhi = 0.; | |
42 | } | |
43 | ||
a918d77a | 44 | AliPMDUtility::AliPMDUtility(Float_t px, Float_t py, Float_t pz) |
638f6e9b | 45 | { |
a918d77a | 46 | // Constructor |
47 | fPx = px; | |
48 | fPy = py; | |
49 | fPz = pz; | |
638f6e9b | 50 | fTheta = 0.; |
51 | fEta = 0.; | |
52 | fPhi = 0.; | |
53 | } | |
54 | ||
55 | AliPMDUtility::~AliPMDUtility() | |
56 | { | |
a918d77a | 57 | // Default destructor |
638f6e9b | 58 | } |
afb8e3a0 | 59 | void AliPMDUtility::HexGeomCellPos(Int_t ism, Int_t xpad, Int_t ypad, Float_t &xpos, Float_t &ypos) |
60 | { | |
a918d77a | 61 | // This converts PMD cluster or CELL coordinates |
62 | // to Global coordinates. | |
63 | // Written by Prof. S.C. Phatak | |
64 | ||
65 | const Float_t kCellDia = 0.5; | |
66 | const Float_t kPi = TMath::Pi(); //3.14159; | |
67 | const Double_t kSqroot3by2 = 0.8660254; // sqrth = sqrt(3.)/2. | |
afb8e3a0 | 68 | |
a918d77a | 69 | Int_t i; |
afb8e3a0 | 70 | Int_t j = xpad; |
71 | Int_t k = ypad; | |
72 | ||
afb8e3a0 | 73 | /* |
a918d77a | 74 | Supermodeule number starting from 0 |
afb8e3a0 | 75 | ism --> supermodule no ( 0 - 26 ) |
76 | idet --> detector ( pmd or cpv : not required now ) | |
77 | j --> xpad ( goes from 1 to 72 ) | |
78 | k --> ypad ( goes from 1 to 72 ) | |
79 | xp --> global x coordinate | |
80 | yp --> global y coordinate | |
81 | ||
82 | (xp0,yp0) corner positions of all supermodules in global | |
83 | coordinate system. That is the origin | |
84 | of the local ( supermodule ) coordinate system. | |
a918d77a | 85 | */ |
afb8e3a0 | 86 | |
87 | Float_t xp0[27] = | |
88 | { | |
89 | -17.9084, 18.2166, 54.3416, -35.9709, 0.154144, | |
90 | 36.2791, -54.0334, -17.9084, 18.2166, 36.7791, | |
91 | 18.7166, 0.654194, 72.9041, 54.8416, 36.7792, | |
92 | 109.029, 90.9666, 72.9042, -18.8708, -36.9334, | |
93 | -54.996, -36.9332, -54.9958, -73.0584, -54.9956, | |
94 | -73.0582, -91.1208 | |
95 | }; | |
96 | ||
97 | Float_t yp0[27] = | |
98 | { | |
99 | -32.1395, -32.1395, -32.1395, -63.4247, -63.4247, | |
100 | -63.4247, -94.7098, -94.7098, -94.7098, 0.545689, | |
101 | 31.8309, 63.1161, 0.545632, 31.8308, 63.116, | |
102 | 0.545573, 31.8308, 63.116, 31.5737, 0.288616, | |
103 | -30.9965, 62.859, 31.5738, 0.288733, 94.1442, | |
104 | 62.8591, 31.574 | |
105 | }; | |
106 | ||
107 | /* | |
108 | angles of rotation for three sets of supermodules | |
109 | The angle is same for first nine, next nine and last nine | |
110 | supermodules | |
111 | */ | |
112 | ||
a918d77a | 113 | Float_t th[3] = {0., -2.*kPi/3., 2.*kPi/3.}; |
afb8e3a0 | 114 | Float_t xr, yr, xinit, yinit, cs, sn; |
115 | ||
116 | /* | |
117 | xinit and yinit are coordinates of the cell in local coordinate system | |
118 | */ | |
119 | ||
a918d77a | 120 | xinit = (j)*kCellDia+(k)/2.*kCellDia; |
121 | yinit = kSqroot3by2*(k)/2.; | |
afb8e3a0 | 122 | i=ism/9; |
123 | cs=cos(th[i]); | |
124 | sn=sin(th[i]); | |
125 | // | |
126 | // rotate first | |
127 | // | |
128 | xr=cs*xinit+sn*yinit; | |
129 | yr=-sn*xinit+cs*yinit; | |
130 | // | |
131 | // then translate | |
132 | // | |
133 | xpos=xr+xp0[ism]; | |
134 | ypos=yr+yp0[ism]; | |
135 | ||
136 | } | |
137 | ||
138 | void AliPMDUtility::RectGeomCellPos(Int_t ism, Int_t ium, Int_t xpad, Int_t ypad, Float_t &xpos, Float_t &ypos) | |
139 | { | |
140 | // This routine finds the cell eta,phi for the new PMD rectangular | |
141 | // geometry in ALICE | |
142 | // Authors : Bedanga Mohanty and Dipak Mishra - 29.4.2003 | |
143 | // modified by B. K. Nnadi for change of coordinate sys | |
144 | // | |
145 | // SMA ---> Supermodule Type A ( SM - 0) | |
146 | // SMAR ---> Supermodule Type A ROTATED ( SM - 1) | |
147 | // SMB ---> Supermodule Type B ( SM - 2) | |
148 | // SMBR ---> Supermodule Type B ROTATED ( SM - 3) | |
149 | // | |
150 | // ism : number of supermodules in one plane = 4 | |
151 | // ium : number of unitmodules in one SM = 6 | |
a918d77a | 152 | // gbum : (global) unit module numbering in a supermodule |
afb8e3a0 | 153 | // |
154 | ||
a918d77a | 155 | Int_t gbum = ism*6 + ium; |
afb8e3a0 | 156 | Int_t irow = xpad; |
157 | Int_t icol = ypad; | |
158 | ||
159 | // Corner positions (x,y) of the 24 unit moudles in ALICE PMD | |
160 | ||
a918d77a | 161 | Double_t xcorner[24] = |
afb8e3a0 | 162 | { |
163 | 85.15, 60.85, 36.55, 85.15, 60.85, 36.55, //SMA | |
164 | -85.15, -60.85, -36.55, -85.15, -60.85, -36.55, //SMAR | |
165 | 84.90, 36.60, 84.90, 36.60, 84.90, 36.60, //SMB | |
166 | -84.90, -36.60, -84.90, -36.60, -84.90, -36.60 //SMBR | |
167 | }; | |
168 | ||
a918d77a | 169 | Double_t ycorner[24] = |
afb8e3a0 | 170 | { |
171 | 32.45708755, 32.45708755, 32.45708755, //SMA | |
172 | -9.30645245, -9.30645245, -9.30645245, //SMA | |
173 | -32.45708755, -32.45708755, -32.45708755, //SMAR | |
174 | 9.30645245, 9.30645245, 9.30645245, //SMAR | |
175 | -31.63540818, -31.63540818, -52.61435544, //SMB | |
176 | -52.61435544, -73.59330270, -73.59330270, //SMB | |
177 | 31.63540818, 31.63540818, 52.61435544, //SMBR | |
178 | 52.61435544, 73.59330270, 73.59330270 //SMBR | |
179 | }; | |
180 | ||
a918d77a | 181 | const Float_t kSqroot3 = 1.73205; // sqrt(3.); |
182 | const Float_t kCellRadius = 0.25; | |
afb8e3a0 | 183 | |
184 | // | |
185 | //Every even row of cells is shifted and placed | |
186 | //in geant so this condition | |
187 | // | |
a2441c6e | 188 | Float_t shift = 0.0; |
afb8e3a0 | 189 | if(irow%2 == 0) |
190 | { | |
191 | shift = 0.25; | |
192 | } | |
193 | else | |
194 | { | |
195 | shift = 0.0; | |
196 | } | |
197 | if(ism == 0 || ism == 2) | |
198 | { | |
a918d77a | 199 | ypos = ycorner[gbum] + |
200 | irow*kCellRadius*kSqroot3; | |
afb8e3a0 | 201 | |
a918d77a | 202 | xpos = xcorner[gbum] - |
203 | icol*2.0*kCellRadius - shift; | |
afb8e3a0 | 204 | } |
205 | else if(ism == 1 || ism == 3) | |
206 | { | |
a918d77a | 207 | ypos = ycorner[gbum] - |
208 | irow*kCellRadius*kSqroot3; | |
afb8e3a0 | 209 | |
a918d77a | 210 | xpos = xcorner[gbum] + |
211 | icol*2.0*kCellRadius + shift; | |
a2441c6e | 212 | } |
213 | } | |
214 | ||
215 | void AliPMDUtility::RectGeomCellPos(Int_t ism, Int_t ium, Float_t xpad, Float_t ypad, Float_t &xpos, Float_t &ypos) | |
216 | { | |
217 | // If the xpad and ypad inputs are float, then 0.5 is added to it | |
218 | // to find the layer which is shifted. | |
219 | // This routine finds the cell eta,phi for the new PMD rectangular | |
220 | // geometry in ALICE | |
221 | // Authors : Bedanga Mohanty and Dipak Mishra - 29.4.2003 | |
222 | // modified by B. K. Nnadi for change of coordinate sys | |
223 | // | |
224 | // SMA ---> Supermodule Type A ( SM - 0) | |
225 | // SMAR ---> Supermodule Type A ROTATED ( SM - 1) | |
226 | // SMB ---> Supermodule Type B ( SM - 2) | |
227 | // SMBR ---> Supermodule Type B ROTATED ( SM - 3) | |
228 | // | |
229 | // ism : number of supermodules in one plane = 4 | |
230 | // ium : number of unitmodules in one SM = 6 | |
a918d77a | 231 | // gbum : (global) unit module numbering in a supermodule |
a2441c6e | 232 | // |
233 | ||
a918d77a | 234 | Int_t gbum = ism*6 + ium; |
a2441c6e | 235 | Float_t irow = xpad; |
236 | Float_t icol = ypad; | |
237 | ||
238 | // Corner positions (x,y) of the 24 unit moudles in ALICE PMD | |
239 | ||
a918d77a | 240 | Double_t xcorner[24] = |
a2441c6e | 241 | { |
242 | 85.15, 60.85, 36.55, 85.15, 60.85, 36.55, //SMA | |
243 | -85.15, -60.85, -36.55, -85.15, -60.85, -36.55, //SMAR | |
244 | 84.90, 36.60, 84.90, 36.60, 84.90, 36.60, //SMB | |
245 | -84.90, -36.60, -84.90, -36.60, -84.90, -36.60 //SMBR | |
246 | }; | |
247 | ||
a918d77a | 248 | Double_t ycorner[24] = |
a2441c6e | 249 | { |
250 | 32.45708755, 32.45708755, 32.45708755, //SMA | |
251 | -9.30645245, -9.30645245, -9.30645245, //SMA | |
252 | -32.45708755, -32.45708755, -32.45708755, //SMAR | |
253 | 9.30645245, 9.30645245, 9.30645245, //SMAR | |
254 | -31.63540818, -31.63540818, -52.61435544, //SMB | |
255 | -52.61435544, -73.59330270, -73.59330270, //SMB | |
256 | 31.63540818, 31.63540818, 52.61435544, //SMBR | |
257 | 52.61435544, 73.59330270, 73.59330270 //SMBR | |
258 | }; | |
259 | ||
a918d77a | 260 | const Float_t kSqroot3 = 1.73205; // sqrt(3.); |
261 | const Float_t kCellRadius = 0.25; | |
a2441c6e | 262 | |
263 | // | |
264 | //Every even row of cells is shifted and placed | |
265 | //in geant so this condition | |
266 | // | |
267 | Float_t shift = 0.0; | |
268 | Int_t iirow = (Int_t) (irow+0.5); | |
269 | if(iirow%2 == 0) | |
270 | { | |
271 | shift = 0.25; | |
272 | } | |
273 | else | |
274 | { | |
275 | shift = 0.0; | |
276 | } | |
277 | if(ism == 0 || ism == 2) | |
278 | { | |
a918d77a | 279 | ypos = ycorner[gbum] + |
280 | irow*kCellRadius*kSqroot3; | |
a2441c6e | 281 | |
a918d77a | 282 | xpos = xcorner[gbum] - |
283 | icol*2.0*kCellRadius - shift; | |
a2441c6e | 284 | } |
285 | else if(ism == 1 || ism == 3) | |
286 | { | |
a918d77a | 287 | ypos = ycorner[gbum] - |
288 | irow*kCellRadius*kSqroot3; | |
a2441c6e | 289 | |
a918d77a | 290 | xpos = xcorner[gbum] + |
291 | icol*2.0*kCellRadius + shift; | |
afb8e3a0 | 292 | } |
293 | } | |
638f6e9b | 294 | |
a918d77a | 295 | void AliPMDUtility::SetPxPyPz(Float_t px, Float_t py, Float_t pz) |
638f6e9b | 296 | { |
a918d77a | 297 | fPx = px; |
298 | fPy = py; | |
299 | fPz = pz; | |
638f6e9b | 300 | } |
301 | ||
a918d77a | 302 | void AliPMDUtility::SetXYZ(Float_t xpos, Float_t ypos, Float_t zpos) |
638f6e9b | 303 | { |
a918d77a | 304 | fPx = xpos; |
305 | fPy = ypos; | |
306 | fPz = zpos; | |
638f6e9b | 307 | } |
308 | void AliPMDUtility::CalculateEta() | |
309 | { | |
310 | Float_t rpxpy, theta, eta; | |
311 | ||
312 | rpxpy = TMath::Sqrt(fPx*fPx + fPy*fPy); | |
313 | theta = TMath::ATan2(rpxpy,fPz); | |
314 | eta = -TMath::Log(TMath::Tan(0.5*theta)); | |
315 | fTheta = theta; | |
316 | fEta = eta; | |
317 | } | |
318 | void AliPMDUtility::CalculatePhi() | |
319 | { | |
320 | Float_t pybypx, phi = 0., phi1; | |
321 | ||
322 | if(fPx==0) | |
323 | { | |
324 | if(fPy>0) phi = 90.; | |
325 | if(fPy<0) phi = 270.; | |
326 | } | |
327 | if(fPx != 0) | |
328 | { | |
329 | pybypx = fPy/fPx; | |
330 | if(pybypx < 0) pybypx = - pybypx; | |
331 | phi1 = TMath::ATan(pybypx)*180./3.14159; | |
afb8e3a0 | 332 | |
333 | if(fPx > 0 && fPy > 0) phi = phi1; // 1st Quadrant | |
334 | if(fPx < 0 && fPy > 0) phi = 180 - phi1; // 2nd Quadrant | |
335 | if(fPx < 0 && fPy < 0) phi = 180 + phi1; // 3rd Quadrant | |
336 | if(fPx > 0 && fPy < 0) phi = 360 - phi1; // 4th Quadrant | |
337 | ||
638f6e9b | 338 | } |
339 | phi = phi*3.14159/180.; | |
340 | ||
341 | fPhi = phi; | |
342 | ||
343 | } | |
344 | void AliPMDUtility::CalculateEtaPhi() | |
345 | { | |
346 | Float_t rpxpy, theta, eta; | |
347 | Float_t pybypx, phi = 0., phi1; | |
348 | ||
349 | rpxpy = TMath::Sqrt(fPx*fPx + fPy*fPy); | |
350 | theta = TMath::ATan2(rpxpy,fPz); | |
351 | eta = -TMath::Log(TMath::Tan(0.5*theta)); | |
352 | ||
353 | if(fPx==0) | |
354 | { | |
355 | if(fPy>0) phi = 90.; | |
356 | if(fPy<0) phi = 270.; | |
357 | } | |
358 | if(fPx != 0) | |
359 | { | |
360 | pybypx = fPy/fPx; | |
361 | if(pybypx < 0) pybypx = - pybypx; | |
362 | phi1 = TMath::ATan(pybypx)*180./3.14159; | |
afb8e3a0 | 363 | if(fPx > 0 && fPy > 0) phi = phi1; // 1st Quadrant |
364 | if(fPx < 0 && fPy > 0) phi = 180 - phi1; // 2nd Quadrant | |
365 | if(fPx < 0 && fPy < 0) phi = 180 + phi1; // 3rd Quadrant | |
366 | if(fPx > 0 && fPy < 0) phi = 360 - phi1; // 4th Quadrant | |
367 | ||
638f6e9b | 368 | } |
369 | phi = phi*3.14159/180.; | |
370 | ||
371 | fTheta = theta; | |
372 | fEta = eta; | |
373 | fPhi = phi; | |
374 | } | |
375 | Float_t AliPMDUtility::GetTheta() const | |
376 | { | |
377 | return fTheta; | |
378 | } | |
379 | Float_t AliPMDUtility::GetEta() const | |
380 | { | |
381 | return fEta; | |
382 | } | |
383 | Float_t AliPMDUtility::GetPhi() const | |
384 | { | |
385 | return fPhi; | |
386 | } | |
387 |