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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 | **************************************************************************/ |
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15 | |
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16 | /* $Id$ */ |
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17 | |
18 | #include "AliMUONSegmentationV0.h" |
19 | #include "TArc.h" |
20 | #include "TMath.h" |
21 | #include "AliMUONChamber.h" |
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22 | #include "AliRun.h" |
23 | #include "AliMUON.h" |
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24 | |
25 | ClassImp(AliMUONSegmentationV0) |
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26 | AliMUONSegmentationV0::AliMUONSegmentationV0(const AliMUONSegmentationV0& segmentation):AliSegmentation(segmentation) |
27 | { |
28 | // Dummy copy constructor |
29 | } |
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30 | |
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31 | void AliMUONSegmentationV0::Init(Int_t chamber) |
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32 | { |
33 | // Initialises member data of the segmentation from geometry data |
34 | // owned by Chamber |
35 | // |
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36 | AliMUON *pMUON = (AliMUON *) gAlice->GetModule("MUON"); |
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37 | fChamber=&(pMUON->Chamber(chamber)); |
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38 | |
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39 | // Initialise maximum number of pads in x ans y |
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40 | fNpx=(Int_t) (fChamber->ROuter()/fDpx+1); |
41 | fNpy=(Int_t) (fChamber->ROuter()/fDpy+1); |
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42 | // Initialize inner and outer radius of the sensitive region |
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43 | fRmin=fChamber->RInner(); |
44 | fRmax=fChamber->ROuter(); |
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45 | fCorr=0; |
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46 | fZ=fChamber->Z(); |
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47 | fId=chamber; |
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48 | } |
49 | |
50 | |
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51 | Float_t AliMUONSegmentationV0::GetAnod(Float_t xhit) const |
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52 | { |
53 | // Returns for a hit position xhit the position of the nearest anode wire |
54 | Float_t wire= (xhit>0)? Int_t(xhit/fWireD)+0.5:Int_t(xhit/fWireD)-0.5; |
55 | return fWireD*wire; |
56 | } |
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57 | //____________________________________________________________________________ |
58 | void AliMUONSegmentationV0::GetNParallelAndOffset(Int_t /*iX*/, Int_t /*iY*/, Int_t *Nparallel, Int_t *Offset) |
59 | { |
60 | *Nparallel=1; |
61 | *Offset=0; |
62 | } |
63 | |
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64 | |
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65 | //____________________________________________________________________________ |
66 | void AliMUONSegmentationV0::GetPadI(Float_t x, Float_t y , Float_t /*z*/, Int_t &ix, Int_t &iy) |
67 | { |
68 | GetPadI(x, y, ix, iy); |
69 | } |
70 | //____________________________________________________________________________ |
71 | void AliMUONSegmentationV0::SetCorrFunc(Int_t /*dum*/, TF1* func) |
72 | { |
73 | fCorr=func; |
74 | } |
75 | //____________________________________________________________________________ |
76 | Int_t AliMUONSegmentationV0::Sector(Int_t /*ix*/, Int_t /*iy*/) |
77 | { |
78 | return 1; |
79 | } |
80 | //____________________________________________________________________________ |
81 | Int_t AliMUONSegmentationV0::Sector(Float_t /*x*/, Float_t /*y*/) |
82 | { |
83 | return 1; |
84 | } |
85 | //____________________________________________________________________________ |
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86 | void AliMUONSegmentationV0::SetPadSize(Float_t p1, Float_t p2) |
87 | { |
88 | // Sets the padsize |
89 | // |
90 | fDpx=p1; |
91 | fDpy=p2; |
92 | } |
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93 | |
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94 | void AliMUONSegmentationV0:: |
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95 | GetPadI(Float_t x, Float_t y, Int_t &ix, Int_t &iy) |
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96 | { |
97 | // Returns pad coordinates (ix,iy) for given real coordinates (x,y) |
98 | // |
99 | ix = (x>0)? Int_t(x/fDpx)+1 : Int_t(x/fDpx)-1; |
100 | iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1; |
101 | if (iy > fNpy) iy= fNpy; |
102 | if (iy < -fNpy) iy=-fNpy; |
103 | if (ix > fNpx) ix= fNpx; |
104 | if (ix < -fNpx) ix=-fNpx; |
105 | } |
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106 | |
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107 | void AliMUONSegmentationV0:: |
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108 | GetPadC(Int_t ix, Int_t iy, Float_t &x, Float_t &y) |
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109 | { |
110 | // Returns real coordinates (x,y) for given pad coordinates (ix,iy) |
111 | // |
112 | // Comments and Critics: |
113 | |
114 | // The Pad(0,0) does not exist, this causes in the present version errors |
115 | // during iteration when used with hits close to zero. |
116 | // Since we have frame crosses at x=0 or y=0 this does not cause any problems |
117 | // Nevertheless, should be corrected in the next version !! |
118 | // The name fRmin is misleading although we use this version with |
119 | // a circular chamber geometry. |
120 | |
121 | x = (ix>0) ? Float_t(ix*fDpx)-fDpx/2. : Float_t(ix*fDpx)+fDpx/2.; |
122 | y = (iy>0) ? Float_t(iy*fDpy)-fDpy/2. : Float_t(iy*fDpy)+fDpy/2.; |
123 | } |
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124 | //______________________________________________________________________ |
125 | void AliMUONSegmentationV0::SetHit(Float_t xhit, Float_t yhit) |
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126 | { |
127 | // |
128 | // Sets virtual hit position, needed for evaluating pad response |
129 | // outside the tracking program |
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130 | fXhit=xhit; |
131 | fYhit=yhit; |
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132 | } |
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133 | //_______________________________________________________________________ |
134 | void AliMUONSegmentationV0::SetHit(Float_t xhit, Float_t yhit, Float_t /*zhit*/) |
135 | { |
136 | SetHit(xhit, yhit); |
137 | } |
138 | //_______________________________________________________________________ |
139 | |
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140 | |
141 | void AliMUONSegmentationV0:: |
142 | SetPad(Int_t ix, Int_t iy) |
143 | { |
144 | // |
145 | // Sets virtual pad coordinates, needed for evaluating pad response |
146 | // outside the tracking program |
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147 | GetPadC(ix,iy,fX,fY); |
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148 | } |
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149 | //____________________________________________________________________________________ |
150 | void AliMUONSegmentationV0::FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy) |
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151 | { |
152 | // Initialises iteration over pads for charge distribution algorithm |
153 | // |
154 | // |
155 | // Find the wire position (center of charge distribution) |
156 | Float_t x0a=GetAnod(xhit); |
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157 | fXhit=x0a; |
158 | fYhit=yhit; |
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159 | // |
160 | // and take fNsigma*sigma around this center |
161 | Float_t x01=x0a - dx; |
162 | Float_t x02=x0a + dx; |
163 | Float_t y01=yhit - dy; |
164 | Float_t y02=yhit + dy; |
165 | // |
166 | // find the pads over which the charge distributes |
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167 | GetPadI(x01,y01,fIxmin,fIymin); |
168 | GetPadI(x02,y02,fIxmax,fIymax); |
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169 | // |
170 | // Set current pad to lower left corner |
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171 | fIx=fIxmin; |
172 | fIy=fIymin; |
173 | GetPadC(fIx,fIy,fX,fY); |
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174 | } |
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175 | //________________________________________________________________________ |
176 | void AliMUONSegmentationV0::FirstPad(Float_t xhit, Float_t yhit, Float_t /*zhit*/, Float_t dx, Float_t dy) |
177 | {FirstPad(xhit, yhit, dx, dy);} |
178 | |
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179 | |
180 | void AliMUONSegmentationV0::NextPad() |
181 | { |
182 | // Stepper for the iteration over pads |
183 | // |
184 | // Comments and Critics: |
185 | // Boundary crossing at x=0 or y=0 not correctly handled ! |
186 | // Step to next pad in the integration region |
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187 | if (fIx != fIxmax) { |
188 | if (fIx==-1) fIx++; |
189 | fIx++; |
190 | } else if (fIy != fIymax) { |
191 | fIx=fIxmin; |
192 | if (fIy==-1) fIy++; |
193 | fIy++; |
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194 | } else { |
195 | printf("\n Error: Stepping outside integration region\n "); |
196 | } |
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197 | GetPadC(fIx,fIy,fX,fY); |
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198 | } |
199 | |
200 | Int_t AliMUONSegmentationV0::MorePads() |
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201 | { |
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202 | // Stopping condition for the iterator over pads |
203 | // |
204 | // Are there more pads in the integration region ? |
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205 | |
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206 | if (fIx == fIxmax && fIy == fIymax) { |
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207 | return 0; |
208 | } else { |
209 | return 1; |
210 | |
211 | } |
212 | } |
213 | |
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214 | void AliMUONSegmentationV0::SigGenInit(Float_t x,Float_t y,Float_t /*z*/) |
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215 | { |
216 | // |
217 | // Initialises pad and wire position during stepping |
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218 | fXt =x; |
219 | fYt =y; |
220 | GetPadI(x,y,fIxt,fIyt); |
221 | fIwt= (x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1 ; |
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222 | } |
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223 | |
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224 | Int_t AliMUONSegmentationV0::SigGenCond(Float_t x,Float_t y,Float_t /*z*/) |
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225 | { |
226 | // Signal generation condition during stepping |
227 | // 0: don't generate signal |
228 | // 1: generate signal |
229 | // Comments and critics: |
230 | |
231 | // Crossing of pad boundary and mid plane between neighbouring wires is checked. |
232 | // To correctly simulate the dependence of the spatial resolution on the angle |
233 | // of incidence signal must be generated for constant steps on |
234 | // the projection of the trajectory along the anode wire. |
235 | |
236 | // |
237 | // Signal will be generated if particle crosses pad boundary or |
238 | // boundary between two wires. |
239 | Int_t ixt, iyt; |
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240 | GetPadI(x,y,ixt,iyt); |
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241 | Int_t iwt=(x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1; |
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242 | if ((ixt != fIxt) || (iyt !=fIyt) || (iwt != fIwt)) { |
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243 | return 1; |
244 | } else { |
245 | return 0; |
246 | } |
247 | } |
248 | void AliMUONSegmentationV0:: |
249 | IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2) |
250 | { |
251 | // Returns integration limits for current pad |
252 | // |
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253 | x1=fXhit-fX-fDpx/2.; |
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254 | x2=x1+fDpx; |
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255 | y1=fYhit-fY-fDpy/2.; |
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256 | y2=y1+fDpy; |
257 | } |
258 | |
259 | void AliMUONSegmentationV0:: |
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260 | Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[10], Int_t Ylist[10]) |
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261 | { |
262 | // Returns list of next neighbours for given Pad (iX, iY) |
263 | // |
264 | // Comments and critics |
265 | // "Diagonal" neighbours are not passed |
266 | // Is this ok when we search for local maxima ?? |
267 | // No test whether neighbours have valid indices id performed |
268 | *Nlist=4; |
269 | Xlist[0]=Xlist[1]=iX; |
270 | Xlist[2]=iX-1; |
271 | Xlist[3]=iX+1; |
272 | Ylist[0]=iY-1; |
273 | Ylist[1]=iY+1; |
274 | Ylist[2]=Ylist[3]=iY; |
275 | } |
276 | |
277 | Float_t AliMUONSegmentationV0::Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y |
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278 | , Int_t * /*dummy*/) |
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279 | { |
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280 | // Returns the square of the distance between 1 pad |
281 | // labelled by its Channel numbers and a coordinate |
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282 | |
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283 | Float_t x,y; |
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284 | GetPadC(iX,iY,x,y); |
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285 | return (x-X)*(x-X) + (y-Y)*(y-Y); |
286 | } |
287 | |
288 | |
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289 | void AliMUONSegmentationV0::GiveTestPoints(Int_t &n, Float_t *x, Float_t *y) const |
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290 | { |
291 | // Returns test point on the pad plane. |
292 | // Used during determination of the segmoid correction of the COG-method |
293 | n=1; |
294 | x[0]=(fRmax+fRmin)/2/TMath::Sqrt(2.); |
295 | y[0]=x[0]; |
296 | } |
297 | |
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298 | void AliMUONSegmentationV0::Draw(const char *) const |
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299 | { |
300 | // Draws the segmentation zones |
301 | // |
302 | TArc *circle; |
303 | Float_t scale=0.95/fRmax/2.; |
304 | |
305 | |
306 | circle = new TArc(0.5,0.5,fRmax*scale,0.,360.); |
307 | circle->SetFillColor(2); |
308 | circle->Draw(); |
309 | |
310 | circle = new TArc(0.5,0.5,fRmin*scale,0.,360.); |
311 | circle->SetFillColor(1); |
312 | circle->Draw(); |
313 | } |
314 | |
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315 | AliMUONSegmentationV0& AliMUONSegmentationV0::operator =(const AliMUONSegmentationV0 & /*rhs*/) |
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316 | { |
317 | // Dummy assignment operator |
318 | return *this; |
319 | } |