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0b936dc0 | 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 | /// \class AliMUONPolygon | |
19 | /// | |
20 | /// A simple planar polygon, with a given orientation | |
21 | /// | |
22 | /// \author Laurent Aphecetche, Subatech | |
23 | ||
24 | #include "AliMUONPolygon.h" | |
25 | ||
26 | #include "AliLog.h" | |
27 | #include "Riostream.h" | |
28 | #include "TMath.h" | |
29 | ||
30 | ///\cond CLASSIMP | |
31 | ClassImp(AliMUONPolygon) | |
32 | ///\endcond | |
33 | ||
34 | //_____________________________________________________________________________ | |
35 | AliMUONPolygon::AliMUONPolygon(Int_t nvertices) | |
36 | : TObject(), | |
37 | fN(nvertices), | |
38 | fX(new Double_t[fN]), | |
39 | fY(new Double_t[fN]) | |
40 | { | |
41 | /// Ctor with a predefined number of vertices. | |
42 | } | |
43 | ||
44 | //_____________________________________________________________________________ | |
45 | AliMUONPolygon::AliMUONPolygon(Double_t xpos, Double_t ypos, Double_t halfsizex, Double_t halfsizey) | |
46 | : TObject(), | |
47 | fN(5), | |
48 | fX(new Double_t[fN]), | |
49 | fY(new Double_t[fN]) | |
50 | { | |
51 | /// Ctor. Polygon will be a rectangle. | |
52 | ||
53 | ||
54 | double xmin(xpos-halfsizex); | |
55 | double xmax(xpos+halfsizex); | |
56 | double ymin(ypos-halfsizey); | |
57 | double ymax(ypos+halfsizey); | |
58 | ||
59 | SetVertex(0,xmin,ymin); | |
60 | SetVertex(1,xmax,ymin); | |
61 | SetVertex(2,xmax,ymax); | |
62 | SetVertex(3,xmin,ymax); | |
63 | ||
64 | Close(); | |
65 | } | |
66 | ||
67 | ||
68 | //_____________________________________________________________________________ | |
69 | AliMUONPolygon::~AliMUONPolygon() | |
70 | { | |
71 | /// dtor | |
72 | delete[] fX; | |
73 | delete[] fY; | |
74 | } | |
75 | ||
76 | //______________________________________________________________________________ | |
77 | AliMUONPolygon::AliMUONPolygon(const AliMUONPolygon& rhs) | |
78 | : TObject(rhs), | |
79 | fN(0), | |
80 | fX(0x0), | |
81 | fY(0x0) | |
82 | { | |
83 | /// Copy constructor. | |
84 | ||
85 | ((AliMUONPolygon&)rhs).Copy(*this); | |
86 | } | |
87 | ||
88 | //______________________________________________________________________________ | |
89 | AliMUONPolygon& | |
90 | AliMUONPolygon::operator=(const AliMUONPolygon& rhs) | |
91 | { | |
92 | /// Assignment operator | |
93 | if ( this != &rhs ) | |
94 | { | |
95 | rhs.Copy(*this); | |
96 | } | |
97 | return *this; | |
98 | } | |
99 | ||
100 | //______________________________________________________________________________ | |
101 | Bool_t | |
102 | AliMUONPolygon::Contains(Double_t x, Double_t y) const | |
103 | { | |
104 | /// Whether the polygon contains point (x,y) | |
105 | ||
106 | // Note that the polygon must be a closed polygon (1st and last point | |
107 | // must be identical), which should be the case here. | |
108 | ||
109 | return TMath::IsInside(x,y,fN,fX,fY); | |
110 | } | |
111 | ||
112 | //______________________________________________________________________________ | |
113 | void AliMUONPolygon::Copy(TObject& obj) const | |
114 | { | |
115 | /// Copy this to obj | |
116 | ||
4ba89433 | 117 | TObject::Copy(obj); |
118 | ||
0b936dc0 | 119 | AliMUONPolygon& rhs = static_cast<AliMUONPolygon&>(obj); |
120 | ||
62b6f26d | 121 | Double_t* x(0x0); |
122 | Double_t* y(0x0); | |
0b936dc0 | 123 | |
62b6f26d | 124 | if ( fN > 0 ) |
0b936dc0 | 125 | { |
62b6f26d | 126 | x = new Double_t[fN]; |
127 | y = new Double_t[fN]; | |
128 | ||
129 | for ( Int_t i = 0; i < fN; ++i ) | |
130 | { | |
131 | x[i] = fX[i]; | |
132 | y[i] = fY[i]; | |
133 | } | |
134 | ||
0b936dc0 | 135 | } |
136 | ||
6350d0c0 | 137 | delete [] rhs.fX; |
138 | delete [] rhs.fY; | |
0b936dc0 | 139 | |
140 | rhs.fX = x; | |
141 | rhs.fY = y; | |
142 | rhs.fN = fN; | |
143 | } | |
144 | ||
145 | //_____________________________________________________________________________ | |
146 | void | |
147 | AliMUONPolygon::Close() | |
148 | { | |
149 | /// Make that last point = first point | |
150 | ||
151 | SetVertex(fN-1,X(0),Y(0)); | |
152 | } | |
153 | ||
154 | //_____________________________________________________________________________ | |
155 | void AliMUONPolygon::Print(Option_t*) const | |
156 | { | |
157 | /// Printout | |
158 | cout << Form("AliMUONPolygon : %3d vertices. Signed Area=%e",NumberOfVertices(),SignedArea()) << endl; | |
159 | for ( Int_t i = 0; i < NumberOfVertices(); ++i ) | |
160 | { | |
161 | cout << Form("%10.5f,%10.5f",X(i),Y(i)) << endl; | |
162 | } | |
163 | } | |
164 | ||
165 | //_____________________________________________________________________________ | |
166 | Double_t | |
167 | AliMUONPolygon::SignedArea() const | |
168 | { | |
169 | /// Compute the signed area of this polygon | |
170 | /// Algorithm from F. Feito, J.C. Torres and A. Urena, | |
171 | /// Comput. & Graphics, Vol. 19, pp. 595-600, 1995 | |
172 | ||
173 | Double_t area(0.0); | |
174 | ||
175 | for ( Int_t i = 0; i < NumberOfVertices()-1; ++i ) | |
176 | { | |
177 | area += X(i)*Y(i+1) - X(i+1)*Y(i); | |
178 | } | |
179 | ||
180 | return area; | |
181 | } | |
182 | ||
183 | //_____________________________________________________________________________ | |
184 | void | |
185 | AliMUONPolygon::ReverseOrientation() | |
186 | { | |
187 | /// Reverse the orientation of this polygon | |
188 | Double_t* x = new Double_t[fN]; | |
189 | Double_t* y = new Double_t[fN]; | |
190 | ||
191 | for ( Int_t i = fN-1; i >= 0; --i ) | |
192 | { | |
193 | x[i] = X(fN-i-1); | |
194 | y[i] = Y(fN-i-1); | |
195 | } | |
196 | ||
197 | delete[] fX; | |
198 | delete[] fY; | |
199 | ||
200 | fX = x; | |
201 | fY = y; | |
202 | } | |
203 | ||
204 | //_____________________________________________________________________________ | |
205 | void | |
206 | AliMUONPolygon::SetVertex(Int_t i, Double_t x, Double_t y) | |
207 | { | |
208 | /// Set one vertex | |
209 | if ( i >= fN ) | |
210 | { | |
fc2293be | 211 | AliFatal("Wrong index"); |
0b936dc0 | 212 | } |
213 | fX[i] = x; | |
214 | fY[i] = y; | |
215 | } | |
216 |