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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 | **************************************************************************/ | |
15 | ||
16 | // $Id$ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////// | |
19 | // Class AliPosition | |
20 | // Handling of positions in various reference frames. | |
21 | // | |
22 | // This class is meant to serve as a base class for ALICE objects | |
23 | // that have a unique position in 3-dimensional space. | |
24 | // | |
25 | // Note : | |
26 | // ------ | |
27 | // Positions (r), errors (e) and reference frames (f) are specified via | |
28 | // | |
29 | // SetPosition(Float_t* r,TString f) | |
30 | // SetPositionErrors(Float_t* e,TString f) | |
31 | // | |
32 | // under the following conventions : | |
33 | // | |
34 | // f="car" ==> r in Cartesian coordinates (x,y,z) | |
35 | // f="sph" ==> r in Spherical coordinates (r,theta,phi) | |
36 | // f="cyl" ==> r in Cylindrical coordinates (rho,phi,z) | |
37 | // | |
38 | // All angles are in radians. | |
39 | // | |
40 | // The unit scale for the coordinates can be defined by the user | |
41 | // via the SetUnitScale() memberfunction. | |
42 | // This enables standardised expressions using numerical values of | |
43 | // physical constants by means of the GetUnitScale() memberfunction. | |
44 | // By default the unit scale is set to cm, corresponding to invokation | |
45 | // of SetUnitScale(0.01). | |
46 | // | |
47 | // | |
48 | // Example : | |
49 | // --------- | |
50 | // | |
51 | // AliPosition q; | |
52 | // Float_t pos[3]={-1,25,7}; | |
53 | // Float_t err[3]={0.08,1.85,0.5}; | |
54 | // q.SetPosition(pos,"car"); | |
55 | // q.SetPositionErrors(pos,"car"); | |
56 | // Float_t loc[3],dloc[3]; | |
57 | // q.GetPosition(loc,"sph"); | |
58 | // q.GetPositionErrors(dloc,"sph"); | |
59 | // | |
60 | //--- Author: Nick van Eijndhoven 06-feb-1999 UU-SAP Utrecht | |
61 | //- Modified: NvE $Date$ UU-SAP Utrecht | |
62 | /////////////////////////////////////////////////////////////////////////// | |
63 | ||
64 | #include "AliPosition.h" | |
65 | #include "Riostream.h" | |
66 | ||
67 | ClassImp(AliPosition) // Class implementation to enable ROOT I/O | |
68 | ||
69 | AliPosition::AliPosition() | |
70 | { | |
71 | // Creation of an AliPosition object and initialisation of parameters. | |
72 | // The unit scale for position coordinates is initialised to cm. | |
73 | fScale=0.01; | |
74 | fTstamp=0; | |
75 | } | |
76 | /////////////////////////////////////////////////////////////////////////// | |
77 | AliPosition::~AliPosition() | |
78 | { | |
79 | // Destructor to delete dynamically allocated memory | |
80 | if (fTstamp) | |
81 | { | |
82 | delete fTstamp; | |
83 | fTstamp=0; | |
84 | } | |
85 | } | |
86 | /////////////////////////////////////////////////////////////////////////// | |
87 | AliPosition::AliPosition(const AliPosition& p) : Ali3Vector(p) | |
88 | { | |
89 | // Copy constructor | |
90 | fScale=p.fScale; | |
91 | if (p.fTstamp) fTstamp=new AliTimestamp(*(p.fTstamp)); | |
92 | } | |
93 | /////////////////////////////////////////////////////////////////////////// | |
94 | void AliPosition::SetPosition(Double_t* r,TString f) | |
95 | { | |
96 | // Store position according to reference frame f | |
97 | SetVector(r,f); | |
98 | } | |
99 | /////////////////////////////////////////////////////////////////////////// | |
100 | void AliPosition::GetPosition(Double_t* r,TString f) const | |
101 | { | |
102 | // Provide position according to reference frame f | |
103 | GetVector(r,f); | |
104 | } | |
105 | /////////////////////////////////////////////////////////////////////////// | |
106 | void AliPosition::SetPosition(Float_t* r,TString f) | |
107 | { | |
108 | // Store position according to reference frame f | |
109 | SetVector(r,f); | |
110 | } | |
111 | /////////////////////////////////////////////////////////////////////////// | |
112 | void AliPosition::GetPosition(Float_t* r,TString f) const | |
113 | { | |
114 | // Provide position according to reference frame f | |
115 | GetVector(r,f); | |
116 | } | |
117 | /////////////////////////////////////////////////////////////////////////// | |
118 | AliPosition& AliPosition::GetPosition() | |
119 | { | |
120 | // Provide position | |
121 | return (*this); | |
122 | } | |
123 | /////////////////////////////////////////////////////////////////////////// | |
124 | void AliPosition::SetPosition(Ali3Vector& r) | |
125 | { | |
126 | // Set position | |
127 | Double_t a[3]; | |
128 | r.GetVector(a,"sph"); | |
129 | SetVector(a,"sph"); | |
130 | r.GetErrors(a,"car"); | |
131 | SetErrors(a,"car"); | |
132 | } | |
133 | /////////////////////////////////////////////////////////////////////////// | |
134 | void AliPosition::SetPositionErrors(Double_t* r,TString f) | |
135 | { | |
136 | // Store position errors according to reference frame f | |
137 | SetErrors(r,f); | |
138 | } | |
139 | /////////////////////////////////////////////////////////////////////////// | |
140 | void AliPosition::GetPositionErrors(Double_t* r,TString f) const | |
141 | { | |
142 | // Provide position errors according to reference frame f | |
143 | GetErrors(r,f); | |
144 | } | |
145 | /////////////////////////////////////////////////////////////////////////// | |
146 | void AliPosition::SetPositionErrors(Float_t* r,TString f) | |
147 | { | |
148 | // Store position errors according to reference frame f | |
149 | SetErrors(r,f); | |
150 | } | |
151 | /////////////////////////////////////////////////////////////////////////// | |
152 | void AliPosition::GetPositionErrors(Float_t* r,TString f) const | |
153 | { | |
154 | // Provide position errors according to reference frame f | |
155 | GetErrors(r,f); | |
156 | } | |
157 | /////////////////////////////////////////////////////////////////////////// | |
158 | void AliPosition::ResetPosition() | |
159 | { | |
160 | // Reset the position and corresponding errors to 0. | |
161 | Double_t r[3]={0,0,0}; | |
162 | SetVector(r,"sph"); | |
163 | SetErrors(r,"car"); | |
164 | } | |
165 | /////////////////////////////////////////////////////////////////////////// | |
166 | Double_t AliPosition::GetDistance(AliPosition& p) | |
167 | { | |
168 | // Provide distance of the current AliPosition to position p. | |
169 | // The error on the result can be obtained as usual by invoking | |
170 | // GetResultError() afterwards. | |
171 | // | |
172 | // In the case of two positions with different unit scales, the distance | |
173 | // will be provided in the unit scale of the current AliPosition. | |
174 | // This implies that in such cases the results of r.GetDistance(q) and | |
175 | // q.GetDistance(r) will be numerically different. | |
176 | // As such it is possible to obtain a correctly computed distance between | |
177 | // positions which have different unit scales. | |
178 | // However, it is recommended to work always with one single unit scale. | |
179 | // | |
180 | Ali3Vector d=(Ali3Vector)p; | |
181 | Float_t pscale=p.GetUnitScale(); | |
182 | if ((pscale/fScale > 1.1) || (fScale/pscale > 1.1)) d=d*(pscale/fScale); | |
183 | Ali3Vector q=(Ali3Vector)(*this); | |
184 | d=d-q; | |
185 | Double_t dist=d.GetNorm(); | |
186 | fDresult=d.GetResultError(); | |
187 | return dist; | |
188 | } | |
189 | /////////////////////////////////////////////////////////////////////////// | |
190 | void AliPosition::SetUnitScale(Float_t s) | |
191 | { | |
192 | // Set the unit scale for the position coordinates. | |
193 | // The scale is normalised w.r.t. the meter, so setting the unit scale | |
194 | // to 0.01 means that all position coordinates are in cm. | |
195 | // By default the unit scale is set to cm in the AliPosition constructor. | |
196 | // It is recommended to use one single unit scale throughout a complete | |
197 | // analysis and/or simulation project. | |
198 | // | |
199 | // Note : This memberfunction does not modify the numerical values of | |
200 | // the position coordinates. | |
201 | // It only specifies their numerical meaning. | |
202 | // | |
203 | if (s>0.) | |
204 | { | |
205 | fScale=s; | |
206 | } | |
207 | else | |
208 | { | |
209 | cout << " *AliPosition::SetUnitScale* Invalid argument s = " << s << endl; | |
210 | } | |
211 | } | |
212 | /////////////////////////////////////////////////////////////////////////// | |
213 | Float_t AliPosition::GetUnitScale() const | |
214 | { | |
215 | // Provide the unit scale for the position coordinates. | |
216 | // The scale is normalised w.r.t. the meter, so a unit scale of 0.01 | |
217 | // means that all position coordinates are in cm. | |
218 | return fScale; | |
219 | } | |
220 | /////////////////////////////////////////////////////////////////////////// | |
221 | void AliPosition::SetTimestamp(AliTimestamp& t) | |
222 | { | |
223 | // Store the timestamp for this position. | |
224 | if (fTstamp) delete fTstamp; | |
225 | fTstamp=new AliTimestamp(t); | |
226 | } | |
227 | /////////////////////////////////////////////////////////////////////////// | |
228 | AliTimestamp* AliPosition::GetTimestamp() | |
229 | { | |
230 | // Provide the timestamp of this position. | |
231 | return fTstamp; | |
232 | } | |
233 | /////////////////////////////////////////////////////////////////////////// | |
234 | void AliPosition::RemoveTimestamp() | |
235 | { | |
236 | // Remove the timestamp from this postion. | |
237 | if (fTstamp) | |
238 | { | |
239 | delete fTstamp; | |
240 | fTstamp=0; | |
241 | } | |
242 | } | |
243 | /////////////////////////////////////////////////////////////////////////// | |
244 | void AliPosition::Data(TString f) const | |
245 | { | |
246 | // Provide all position/time information within the coordinate frame f. | |
247 | Ali3Vector::Data(f); | |
248 | if (fTstamp) fTstamp->Date(1); | |
249 | } | |
250 | /////////////////////////////////////////////////////////////////////////// |