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 1.8 2005/09/26 16:06:36 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 <TError.h>
  28
  29 #include "AliMpGraphContext.h"
  30
  31 ClassImp(AliMpGraphContext)
  32
  33 AliMpGraphContext *AliMpGraphContext::fgInstance = 0;
  34 AliMpGraphContext::GraphContextVector AliMpGraphContext::fgStack;
  35 #ifdef WITH_ROOT
  36 Int_t              AliMpGraphContext::fgStackSize = 0;
  37 #endif
  38
  39 //_____________________________________________________________________________
  40 AliMpGraphContext::AliMpGraphContext():
  41   TObject(),
  42   fPadPosition(TVector2(0.5,0.5)),
  43   fPadDimensions(TVector2(0.49,0.49)),
  44   fRealPosition(TVector2(0.,0.)),
  45   fRealDimensions(TVector2(1,1))
  46 {
  47 /// Private constructor
  48
  49   fColor = 20;
  50   // default constructor (private)
  51 }
  52
  53 //_____________________________________________________________________________
  54 AliMpGraphContext::AliMpGraphContext(const AliMpGraphContext& right)
  55   : TObject(right),
  56     fColor(right.fColor),
  57     fPadPosition(right.fPadPosition),
  58     fPadDimensions(right.fPadDimensions),
  59     fRealPosition(right.fRealPosition),
  60     fRealDimensions(right.fRealDimensions)
  61 {
  62 /// Copy constructor
  63 }
  64
  65 //_____________________________________________________________________________
  66 AliMpGraphContext&
  67 AliMpGraphContext::operator=(const AliMpGraphContext& right)
  68 {
  69 /// Protected assignment operator
  70
  71   // check assignment to self
  72   if (this == &right) return *this;
  73
  74   fColor = right.fColor;
  75   fPadPosition = right.fPadPosition;
  76   fPadDimensions = right.fPadDimensions;
  77   fRealPosition = right.fRealPosition;
  78   fRealDimensions = right.fRealDimensions;
  79
  80   return *this;
  81 }
  82
  83 //_____________________________________________________________________________
  84 AliMpGraphContext *AliMpGraphContext::Instance()
  85 {
  86   /// Return or create a unique instance of this class
  87
  88   if (fgInstance) return fgInstance;
  89   fgInstance = new AliMpGraphContext;
  90   return fgInstance;
  91 }
  92
  93 //_____________________________________________________________________________
  94 TVector2 AliMpGraphContext::RealToPad(const TVector2 &position) const
  95 {
  96   /// Transform a real position into its equivalent position in the pad
  97
  98   Double_t x=position.X();
  99   Double_t y=position.Y();
 100   x-= (fRealPosition.X()-fRealDimensions.X());
 101   x/=fRealDimensions.X();
 102   x*=fPadDimensions.X();
 103   x+= (fPadPosition.X()-fPadDimensions.X() );
 104
 105   y-= (fRealPosition.Y()-fRealDimensions.Y());
 106   y/=fRealDimensions.Y();
 107   y*=fPadDimensions.Y();
 108   y+= (fPadPosition.Y()-fPadDimensions.Y() );
 109
 110   return TVector2(x,y);
 111 }
 112
 113 //_____________________________________________________________________________
 114 void AliMpGraphContext::RealToPad(const TVector2 &position,
 115                               const TVector2 &dimensions,
 116                               TVector2 &padPosition,
 117                               TVector2 &padDimensions) const
 118 {
 119   // Transform the real area (position,dimensions) to
 120   // its equivalent pad area
 121
 122   padPosition = RealToPad(position);
 123   padDimensions =
 124     TVector2(dimensions.X()*fPadDimensions.X()/fRealDimensions.X(),
 125              dimensions.Y()*fPadDimensions.Y()/fRealDimensions.Y());
 126
 127 }
 128
 129 //_____________________________________________________________________________
 130 void AliMpGraphContext::SetPadPosForReal(const TVector2 &position,
 131                                      const TVector2 &dimensions)
 132 {
 133   /// Set the pad area from the actual one
 134   /// corresponding to the given real area.
 135
 136   RealToPad(position,dimensions,fPadPosition,fPadDimensions);
 137 }
 138
 139 //_____________________________________________________________________________
 140 void AliMpGraphContext::Push() const
 141 {
 142   /// Store the current configuration
 143
 144   AliMpGraphContext *save = new AliMpGraphContext(*this);
 145
 146 #ifdef WITH_STL
 147   fgStack.push_back(save);
 148 #endif
 149
 150 #ifdef WITH_ROOT
 151   fgStack.AddAt(save, fgStackSize++);
 152 #endif
 153 }
 154
 155 //_____________________________________________________________________________
 156 void AliMpGraphContext::Pop()
 157 {
 158 /// Pop an object from the stack.
 159
 160 #ifdef WITH_STL
 161   // restore the last saved configuration
 162   if (!fgStack.empty()){
 163     AliMpGraphContext *obj = fgStack.back();
 164     *this = *obj;
 165     fgStack.pop_back();
 166     delete obj;
 167   }
 168 #endif
 169
 170 #ifdef WITH_ROOT
 171   // restore the last saved configuration
 172   if ( fgStackSize ){
 173     AliMpGraphContext *obj
 174       = (AliMpGraphContext*)fgStack.At(--fgStackSize);
 175     *this = *obj;
 176     fgStack.RemoveAt(fgStackSize);
 177     delete obj;
 178   }
 179 #endif
 180 }