MUON/mapping/AliMpGraphContext.cxx

   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 // $MpId: AliMpGraphContext.cxx,v 1.11 2006/05/24 13:58:32 ivana Exp $
  18 // Category: graphics
  19 //
  20 // Class AliMpGraphContext
  21 // -----------------------
  22 // Class describing a the correspondance between a given area
  23 // in pad, and a zone of real (cm) position
  24 // Included in AliRoot: 2003/05/02
  25 // Author: David GUEZ, IPN Orsay
  26
  27 #include "AliMpGraphContext.h"
  28
  29 /// \cond CLASSIMP
  30 ClassImp(AliMpGraphContext)
  31 /// \endcond
  32
  33 AliMpGraphContext *AliMpGraphContext::fgInstance = 0;
  34 AliMpGraphContext::GraphContextVector AliMpGraphContext::fgStack;
  35
  36 #ifdef WITH_ROOT
  37 Int_t              AliMpGraphContext::fgStackSize = 0;
  38 #endif
  39
  40 //_____________________________________________________________________________
  41 AliMpGraphContext::AliMpGraphContext():
  42   TObject(),
  43   fColor(20),
  44   fPadPosition(TVector2(0.5,0.5)),
  45   fPadDimensions(TVector2(0.49,0.49)),
  46   fRealPosition(TVector2(0.,0.)),
  47   fRealDimensions(TVector2(1,1))
  48 {
  49 /// Default constructor (private)
  50 }
  51
  52 //_____________________________________________________________________________
  53 AliMpGraphContext::AliMpGraphContext(const AliMpGraphContext& right)
  54   : TObject(right),
  55     fColor(right.fColor),
  56     fPadPosition(right.fPadPosition),
  57     fPadDimensions(right.fPadDimensions),
  58     fRealPosition(right.fRealPosition),
  59     fRealDimensions(right.fRealDimensions)
  60 {
  61 /// Copy constructor
  62 }
  63
  64 //_____________________________________________________________________________
  65 AliMpGraphContext&
  66 AliMpGraphContext::operator=(const AliMpGraphContext& right)
  67 {
  68 /// Protected assignment operator
  69
  70   // check assignment to self
  71   if (this == &right) return *this;
  72
  73   fColor = right.fColor;
  74   fPadPosition = right.fPadPosition;
  75   fPadDimensions = right.fPadDimensions;
  76   fRealPosition = right.fRealPosition;
  77   fRealDimensions = right.fRealDimensions;
  78
  79   return *this;
  80 }
  81
  82 //_____________________________________________________________________________
  83 AliMpGraphContext *AliMpGraphContext::Instance()
  84 {
  85   /// Return or create a unique instance of this class
  86
  87   if (fgInstance) return fgInstance;
  88   fgInstance = new AliMpGraphContext;
  89   return fgInstance;
  90 }
  91
  92 //_____________________________________________________________________________
  93 TVector2 AliMpGraphContext::RealToPad(const TVector2 &position) const
  94 {
  95   /// Transform a real position into its equivalent position in the pad
  96
  97   Double_t x=position.X();
  98   Double_t y=position.Y();
  99   x-= (fRealPosition.X()-fRealDimensions.X());
 100   x/=fRealDimensions.X();
 101   x*=fPadDimensions.X();
 102   x+= (fPadPosition.X()-fPadDimensions.X() );
 103
 104   y-= (fRealPosition.Y()-fRealDimensions.Y());
 105   y/=fRealDimensions.Y();
 106   y*=fPadDimensions.Y();
 107   y+= (fPadPosition.Y()-fPadDimensions.Y() );
 108
 109   return TVector2(x,y);
 110 }
 111
 112 //_____________________________________________________________________________
 113 void AliMpGraphContext::RealToPad(const TVector2 &position,
 114                               const TVector2 &dimensions,
 115                               TVector2 &padPosition,
 116                               TVector2 &padDimensions) const
 117 {
 118   // Transform the real area (position,dimensions) to
 119   // its equivalent pad area
 120
 121   padPosition = RealToPad(position);
 122   padDimensions =
 123     TVector2(dimensions.X()*fPadDimensions.X()/fRealDimensions.X(),
 124              dimensions.Y()*fPadDimensions.Y()/fRealDimensions.Y());
 125
 126 }
 127
 128 //_____________________________________________________________________________
 129 void AliMpGraphContext::SetPadPosForReal(const TVector2 &position,
 130                                      const TVector2 &dimensions)
 131 {
 132   /// Set the pad area from the actual one
 133   /// corresponding to the given real area.
 134
 135   RealToPad(position,dimensions,fPadPosition,fPadDimensions);
 136 }
 137
 138 //_____________________________________________________________________________
 139 void AliMpGraphContext::Push() const
 140 {
 141   /// Store the current configuration
 142
 143   AliMpGraphContext *save = new AliMpGraphContext(*this);
 144
 145 #ifdef WITH_STL
 146   fgStack.push_back(save);
 147 #endif
 148
 149 #ifdef WITH_ROOT
 150   fgStack.AddAt(save, fgStackSize++);
 151 #endif
 152 }
 153
 154 //_____________________________________________________________________________
 155 void AliMpGraphContext::Pop()
 156 {
 157 /// Pop an object from the stack.
 158
 159 #ifdef WITH_STL
 160   // restore the last saved configuration
 161   if (!fgStack.empty()){
 162     AliMpGraphContext *obj = fgStack.back();
 163     *this = *obj;
 164     fgStack.pop_back();
 165     delete obj;
 166   }
 167 #endif
 168
 169 #ifdef WITH_ROOT
 170   // restore the last saved configuration
 171   if ( fgStackSize ){
 172     AliMpGraphContext *obj
 173       = (AliMpGraphContext*)fgStack.At(--fgStackSize);
 174     *this = *obj;
 175     fgStack.RemoveAt(fgStackSize);
 176     delete obj;
 177   }
 178 #endif
 179 }