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1 | // $Id$ | |
2 | // Category: graphics | |
3 | // | |
4 | // Class AliMpGraphContext | |
5 | // ----------------------- | |
6 | // Class describing a the correspondance between a given area | |
7 | // in pad, and a zone of real (cm) position | |
8 | // | |
9 | // Author: David GUEZ, IPN Orsay | |
10 | ||
11 | #include "AliMpGraphContext.h" | |
12 | ||
13 | ClassImp(AliMpGraphContext) | |
14 | ||
15 | AliMpGraphContext *AliMpGraphContext::fgInstance = 0; | |
16 | GraphContextVector AliMpGraphContext::fgStack; | |
17 | ||
18 | // private constructor | |
19 | AliMpGraphContext::AliMpGraphContext(): | |
20 | TObject(), | |
21 | fPadPosition(TVector2(0.5,0.5)), | |
22 | fPadDimensions(TVector2(0.49,0.49)), | |
23 | fRealPosition(TVector2(0.,0.)), | |
24 | fRealDimensions(TVector2(1,1)) | |
25 | { | |
26 | fColor = 20; | |
27 | // default constructor (private) | |
28 | } | |
29 | AliMpGraphContext *AliMpGraphContext::Instance() | |
30 | { | |
31 | // return or create a unique instance of this class | |
32 | if (fgInstance) return fgInstance; | |
33 | fgInstance = new AliMpGraphContext; | |
34 | return fgInstance; | |
35 | } | |
36 | ||
37 | TVector2 AliMpGraphContext::RealToPad(const TVector2 &position) const | |
38 | { | |
39 | // transform a real position into its equivalent position in the pad | |
40 | Double_t x=position.X(); | |
41 | Double_t y=position.Y(); | |
42 | x-= (fRealPosition.X()-fRealDimensions.X()); | |
43 | x/=fRealDimensions.X(); | |
44 | x*=fPadDimensions.X(); | |
45 | x+= (fPadPosition.X()-fPadDimensions.X() ); | |
46 | ||
47 | y-= (fRealPosition.Y()-fRealDimensions.Y()); | |
48 | y/=fRealDimensions.Y(); | |
49 | y*=fPadDimensions.Y(); | |
50 | y+= (fPadPosition.Y()-fPadDimensions.Y() ); | |
51 | ||
52 | return TVector2(x,y); | |
53 | } | |
54 | ||
55 | ||
56 | ||
57 | void AliMpGraphContext::RealToPad(const TVector2 &position, | |
58 | const TVector2 &dimensions, | |
59 | TVector2 &padPosition, | |
60 | TVector2 &padDimensions) const | |
61 | { | |
62 | // transform the real area (position,dimensions) to | |
63 | // its equivalent pad area | |
64 | padPosition = RealToPad(position); | |
65 | padDimensions = | |
66 | TVector2(dimensions.X()*fPadDimensions.X()/fRealDimensions.X(), | |
67 | dimensions.Y()*fPadDimensions.Y()/fRealDimensions.Y()); | |
68 | ||
69 | } | |
70 | void AliMpGraphContext::SetPadPosForReal(const TVector2 &position, | |
71 | const TVector2 &dimensions) | |
72 | { | |
73 | // Set the pad area from the actual one | |
74 | // corresponding to the given real area. | |
75 | RealToPad(position,dimensions,fPadPosition,fPadDimensions); | |
76 | } | |
77 | void AliMpGraphContext::Push() const | |
78 | { | |
79 | // Store the current configuration | |
80 | AliMpGraphContext *save = new AliMpGraphContext(*this); | |
81 | fgStack.push_back(save); | |
82 | } | |
83 | void AliMpGraphContext::Pop() | |
84 | { | |
85 | // restore the last saved configuration | |
86 | if (!fgStack.empty()){ | |
87 | AliMpGraphContext *obj = fgStack.back(); | |
88 | *this = *obj; | |
89 | fgStack.pop_back(); | |
90 | delete obj; | |
91 | } | |
92 | } |