IGSTK
/tmp/buildd/igstk-4.4.0/Source/igstkTransformObserver.h
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00001 /*=========================================================================
00002 
00003   Program:   Image Guided Surgery Software Toolkit
00004   Module:    $RCSfile: igstkTransformObserver.h,v $
00005   Language:  C++
00006   Date:      $Date: 2011-01-18 21:40:17 $
00007   Version:   $Revision: 1.3 $
00008 
00009   Copyright (c) ISC  Insight Software Consortium.  All rights reserved.
00010   See IGSTKCopyright.txt or http://www.igstk.org/copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __igstkTransformObserver_h
00018 #define __igstkTransformObserver_h
00019 
00020 #if defined(_MSC_VER)
00021 // Warning about: identifier was truncated to '255' characters
00022 // in the debug information (MVC6.0 Debug)
00023 #pragma warning( disable : 4786 )
00024 #endif
00025 
00026 #include "igstkTransform.h"
00027 #include "igstkCoordinateSystemTransformToResult.h"
00028 #include "igstkCoordinateSystemTransformToErrorResult.h"
00029 
00030 namespace igstk
00031 {
00032 
00033 class TransformObserver : public ::itk::Command 
00034 {
00035 public:
00036   igstkStandardClassBasicTraitsMacro( TransformObserver, ::itk::Command );
00037   igstkNewMacro( Self );  
00038 
00039 protected:
00040   TransformObserver() 
00041     {
00042     m_GotTransform = false;
00043     m_GotTransformNotAvailableMessage = false;
00044     }
00045   ~TransformObserver() {}
00046 public:
00047     
00048   typedef CoordinateSystemTransformToEvent     PositiveEventType;
00049   typedef TransformNotAvailableEvent           NegativeEventType;
00050         
00054   typedef CoordinateSystemTransformToResult PayloadType;
00055 
00056   void ObserveTransformEventsFrom( Object * objectToObserve )
00057     {
00058     if( objectToObserve )
00059       {
00060       objectToObserve->AddObserver( PositiveEventType(), this );
00061       objectToObserve->AddObserver( NegativeEventType(), this );
00062       }
00063     }
00064 
00065   void Execute(itk::Object *caller, const itk::EventObject & event)
00066     {
00067     const itk::Object * constCaller = caller;
00068     this->Execute( constCaller, event );
00069     }
00070 
00071   void Execute(const itk::Object * itkNotUsed(caller), 
00072                                    const itk::EventObject & event)
00073     {
00074 
00075     m_GotTransform = false;
00076     m_GotTransformNotAvailableMessage = false;
00077 
00078     if( PositiveEventType().CheckEvent( &event ) )
00079       {
00080       const PositiveEventType * transformEvent = 
00081                  dynamic_cast< const PositiveEventType *>( &event );
00082       if( transformEvent )
00083         {
00084         m_TransformBetweenCoordinateSystems = transformEvent->Get();
00085         this->m_Transform = m_TransformBetweenCoordinateSystems.GetTransform();
00086         m_GotTransform = true;
00087         m_GotTransformNotAvailableMessage = false;
00088         }
00089       }
00090 
00091     if( NegativeEventType().CheckEvent( &event ) )
00092       {
00093       const NegativeEventType * negativeEvent = 
00094                  dynamic_cast< const NegativeEventType *>( &event );
00095       if( negativeEvent )
00096         {
00097         m_GotTransform = false;
00098         m_GotTransformNotAvailableMessage = true;
00099         }
00100       }
00101     }
00102 
00103   bool GotTransform() const
00104     {
00105     return m_GotTransform;
00106     }
00107 
00108   bool GotTransformNotAvailableMessage() const
00109     {
00110     return m_GotTransformNotAvailableMessage;
00111     }
00112 
00113   const Transform & GetTransform() const
00114     {
00115     return this->m_Transform;
00116     }
00117 
00118   const PayloadType & GetTransformBetweenCoordinateSystems() const
00119     {
00120     return m_TransformBetweenCoordinateSystems;
00121     }
00122  
00123   void Clear()
00124     {
00125     this->m_GotTransform = false;
00126     this->m_GotTransformNotAvailableMessage = false;
00127     }
00128 
00129 private:
00130 
00131   PayloadType         m_TransformBetweenCoordinateSystems;
00132   Transform           m_Transform;
00133   
00134   bool                m_GotTransform;
00135   bool                m_GotTransformNotAvailableMessage;
00136 };
00137 
00138 } // end namespace igstk
00139 
00140 #endif