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