MUON/mapping/AliMpGraphContext.cxx

   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 // Included in AliRoot: 2003/05/02
   9 // Author: David GUEZ, IPN Orsay
  10
  11 #include <TError.h>
  12
  13 #include "AliMpGraphContext.h"
  14
  15 ClassImp(AliMpGraphContext)
  16
  17 AliMpGraphContext *AliMpGraphContext::fgInstance = 0;
  18 GraphContextVector AliMpGraphContext::fgStack;
  19 #ifdef WITH_ROOT
  20 Int_t              AliMpGraphContext::fgStackSize = 0;
  21 #endif
  22
  23 //_____________________________________________________________________________
  24 AliMpGraphContext::AliMpGraphContext():
  25   TObject(),
  26   fPadPosition(TVector2(0.5,0.5)),
  27   fPadDimensions(TVector2(0.49,0.49)),
  28   fRealPosition(TVector2(0.,0.)),
  29   fRealDimensions(TVector2(1,1))
  30 {
  31 // private constructor
  32
  33   fColor = 20;
  34   // default constructor (private)
  35 }
  36
  37 //_____________________________________________________________________________
  38 AliMpGraphContext::AliMpGraphContext(const AliMpGraphContext& right)
  39   : TObject(right)
  40 {
  41 // protected copy constructor
  42
  43   Fatal("AliMpGraphContext", "Copy constructor not provided.");
  44 }
  45
  46 //_____________________________________________________________________________
  47 AliMpGraphContext&
  48 AliMpGraphContext::operator=(const AliMpGraphContext& right)
  49 {
  50 // protected assignement operator
  51
  52   // check assignement to self
  53   if (this == &right) return *this;
  54
  55   Fatal("operator =", "Assignement operator not provided.");
  56
  57   return *this;
  58 }
  59
  60 //_____________________________________________________________________________
  61 AliMpGraphContext *AliMpGraphContext::Instance()
  62 {
  63   // return or create a unique instance of this class
  64   if (fgInstance) return fgInstance;
  65   fgInstance = new AliMpGraphContext;
  66   return fgInstance;
  67 }
  68
  69 //_____________________________________________________________________________
  70 TVector2 AliMpGraphContext::RealToPad(const TVector2 &position) const
  71 {
  72   // transform a real position into its equivalent position in the pad
  73   Double_t x=position.X();
  74   Double_t y=position.Y();
  75   x-= (fRealPosition.X()-fRealDimensions.X());
  76   x/=fRealDimensions.X();
  77   x*=fPadDimensions.X();
  78   x+= (fPadPosition.X()-fPadDimensions.X() );
  79
  80   y-= (fRealPosition.Y()-fRealDimensions.Y());
  81   y/=fRealDimensions.Y();
  82   y*=fPadDimensions.Y();
  83   y+= (fPadPosition.Y()-fPadDimensions.Y() );
  84
  85   return TVector2(x,y);
  86 }
  87
  88 //_____________________________________________________________________________
  89 void AliMpGraphContext::RealToPad(const TVector2 &position,
  90                               const TVector2 &dimensions,
  91                               TVector2 &padPosition,
  92                               TVector2 &padDimensions) const
  93 {
  94   // transform the real area (position,dimensions) to
  95   // its equivalent pad area
  96   padPosition = RealToPad(position);
  97   padDimensions =
  98     TVector2(dimensions.X()*fPadDimensions.X()/fRealDimensions.X(),
  99              dimensions.Y()*fPadDimensions.Y()/fRealDimensions.Y());
 100
 101 }
 102
 103 //_____________________________________________________________________________
 104 void AliMpGraphContext::SetPadPosForReal(const TVector2 &position,
 105                                      const TVector2 &dimensions)
 106 {
 107   // Set the pad area from the actual one
 108   // corresponding to the given real area.
 109   RealToPad(position,dimensions,fPadPosition,fPadDimensions);
 110 }
 111
 112 //_____________________________________________________________________________
 113 void AliMpGraphContext::Push() const
 114 {
 115   // Store the current configuration
 116   AliMpGraphContext *save = new AliMpGraphContext(*this);
 117
 118 #ifdef WITH_STL
 119   fgStack.push_back(save);
 120 #endif
 121
 122 #ifdef WITH_ROOT
 123   fgStack.AddAt(save, fgStackSize++);
 124 #endif
 125 }
 126
 127 //_____________________________________________________________________________
 128 void AliMpGraphContext::Pop()
 129 {
 130 // Pops object from the stack.
 131 #ifdef WITH_STL
 132   // restore the last saved configuration
 133   if (!fgStack.empty()){
 134     AliMpGraphContext *obj = fgStack.back();
 135     *this = *obj;
 136     fgStack.pop_back();
 137     delete obj;
 138   }
 139 #endif
 140
 141 #ifdef WITH_ROOT
 142   // restore the last saved configuration
 143   if ( fgStackSize ){
 144     AliMpGraphContext *obj
 145       = (AliMpGraphContext*)fgStack.At(--fgStackSize);
 146     *this = *obj;
 147     fgStack.RemoveAt(fgStackSize);
 148     delete obj;
 149   }
 150 #endif
 151 }