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5f91c9e8 | 1 | // $Id$ |
2 | // Category: basic | |
3 | // | |
4 | // Class AliMpTransformer | |
5 | // ------------------------ | |
6 | // Class contains definition of transformation and | |
7 | // provides functions for transforming pads. | |
8 | // | |
9 | // Authors: David Guez, Ivana Hrivnacova; IPN Orsay | |
10 | ||
11 | #include "AliMpTransformer.h" | |
12 | ||
13 | ClassImp(AliMpTransformer) | |
14 | ||
15 | ///_____________________________________________________________________________ | |
16 | AliMpTransformer::AliMpTransformer(const TVector2& offset, | |
17 | const AliMpIntPair& scale) | |
18 | : TObject(), | |
19 | fOffset(offset), | |
20 | fScale(scale) | |
21 | { | |
22 | // | |
23 | } | |
24 | ||
25 | ///_____________________________________________________________________________ | |
26 | AliMpTransformer::AliMpTransformer() | |
27 | : TObject(), | |
28 | fOffset(TVector2()), | |
29 | fScale(AliMpIntPair(1,1)) | |
30 | { | |
31 | // | |
32 | } | |
33 | ||
34 | //_____________________________________________________________________________ | |
35 | AliMpTransformer::~AliMpTransformer() { | |
36 | // | |
37 | } | |
38 | ||
39 | // | |
40 | // private methods | |
41 | // | |
42 | ||
43 | //_____________________________________________________________________________ | |
44 | void AliMpTransformer::CutInterval(Double_t x1, Double_t x2, Double_t x0, | |
45 | Double_t s, Double_t& pos, Double_t& dx) const | |
46 | { | |
47 | // Cuts the interval <x1,x2> into <x1', x2'> | |
48 | // by position x0 in direction of s*x. | |
49 | // Returns the centre of the new interval (pos) and its half size. | |
50 | // --- | |
51 | ||
52 | // Transform values | |
53 | ||
54 | Double_t sx0 = s * x0; | |
55 | Double_t sx1 = s * x1; | |
56 | Double_t sx2 = s * x2; | |
57 | ||
58 | if (s < 0) { | |
59 | // when inversion, replace x1 and x2 | |
60 | Double_t tmp = sx1; | |
61 | sx1 = sx2; | |
62 | sx2 = tmp; | |
63 | } | |
64 | ||
65 | if (sx0 > sx2) { | |
66 | // the interval outside region | |
67 | pos = 0.; | |
68 | dx = -1.; | |
69 | } | |
70 | else if (sx0 > sx1) { | |
71 | // x0 cuts the interval | |
72 | dx = (sx2 - sx0)/2.; | |
73 | pos = s * (sx0 + dx); | |
74 | } | |
75 | else { | |
76 | // the interval inside region | |
77 | dx = (sx2 - sx1)/2.; | |
78 | pos = s * ((sx2 + sx1)/2.); | |
79 | } | |
80 | } | |
81 | ||
82 | // | |
83 | // public methods | |
84 | // | |
85 | ||
86 | //_____________________________________________________________________________ | |
87 | AliMpIntPair AliMpTransformer::Scale(const AliMpIntPair& pair) const | |
88 | { | |
89 | // Returns the pair with values scaled by the given scale. | |
90 | // --- | |
91 | ||
92 | return pair * fScale; | |
93 | } | |
94 | ||
95 | //_____________________________________________________________________________ | |
96 | TVector2 AliMpTransformer::Scale(const TVector2& vector) const | |
97 | { | |
98 | // Returns vector with values scaled by the given scale. | |
99 | // --- | |
100 | ||
101 | return TVector2(vector.X()*fScale.GetFirst(), vector.Y()*fScale.GetSecond()); | |
102 | } | |
103 | ||
104 | //_____________________________________________________________________________ | |
105 | AliMpIntPair AliMpTransformer::ScaleLocation(const AliMpIntPair& orig) const | |
106 | { | |
107 | // Returns location with values scaled by the given scale. | |
108 | // --- | |
109 | ||
110 | return AliMpIntPair(orig.GetFirst() * fScale.GetSecond(), orig.GetSecond(), | |
111 | orig.IsValid()); | |
112 | } | |
113 | ||
114 | //_____________________________________________________________________________ | |
115 | AliMpPad AliMpTransformer::Scale(const AliMpPad& pad) const | |
116 | { | |
117 | // Returns pad with indices scaled by the given scale. | |
118 | // --- | |
119 | ||
120 | return AliMpPad(ScaleLocation(pad.GetLocation()), | |
121 | Scale(pad.GetIndices()), | |
122 | Scale(pad.Position()), | |
123 | pad.Dimensions(), | |
124 | pad.IsValid()); | |
125 | } | |
126 | ||
127 | //_____________________________________________________________________________ | |
128 | TVector2 AliMpTransformer::Transform(const TVector2& vector) const | |
129 | { | |
130 | // Transforms given vector with scale and corresponding translation | |
131 | // from sector (local) to plane (global). | |
132 | // --- | |
133 | ||
134 | return Scale(vector) + fOffset; | |
135 | } | |
136 | ||
137 | //_____________________________________________________________________________ | |
138 | TVector2 AliMpTransformer::ITransform(const TVector2& vector) const | |
139 | { | |
140 | // Transforms given vector with scale and corresponding translation | |
141 | // from plane (global) to sector (local). | |
142 | // --- | |
143 | ||
144 | return Scale(vector - fOffset); | |
145 | } | |
146 | ||
147 | //_____________________________________________________________________________ | |
148 | AliMpPad AliMpTransformer::Transform(const AliMpPad& pad) const | |
149 | { | |
150 | // Returns pad with characteristics transformed with given scale and | |
151 | // corresponding translation from sector (local) to plane (global). | |
152 | // --- | |
153 | ||
154 | return AliMpPad(ScaleLocation(pad.GetLocation()), | |
155 | Scale(pad.GetIndices()), | |
156 | Transform(pad.Position()), | |
157 | pad.Dimensions(), | |
158 | pad.IsValid()); | |
159 | } | |
160 | ||
161 | ||
162 | //_____________________________________________________________________________ | |
163 | AliMpPad AliMpTransformer::ITransform(const AliMpPad& pad) const | |
164 | { | |
165 | // Returns pad with characteristics transformed with given scale and | |
166 | // corresponding translation from plane (global) to sector (local). | |
167 | // --- | |
168 | ||
169 | return AliMpPad(ScaleLocation(pad.GetLocation()), | |
170 | Scale(pad.GetIndices()), | |
171 | ITransform(pad.Position()), | |
172 | pad.Dimensions(), | |
173 | pad.IsValid()); | |
174 | } | |
175 | ||
176 | //_____________________________________________________________________________ | |
177 | AliMpArea AliMpTransformer::CutArea(const AliMpArea& area) const | |
178 | { | |
179 | // Cuts the area with its offset in the quadrant defined by scale | |
180 | // and transforms its position into its local system. | |
181 | // --- | |
182 | ||
183 | Double_t posx, dx; | |
184 | CutInterval(area.LeftBorder(), area.RightBorder(), fOffset.X(), | |
185 | fScale.GetFirst(), posx, dx); | |
186 | ||
187 | Double_t posy, dy; | |
188 | CutInterval(area.DownBorder(), area.UpBorder(), fOffset.Y(), | |
189 | fScale.GetSecond(), posy, dy); | |
190 | ||
191 | return AliMpArea(ITransform(TVector2(posx, posy)), TVector2(dx, dy)); | |
192 | } |