itkImageConstIteratorWithIndex.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageConstIteratorWithIndex.h,v $
  Language:  C++
  Date:      $Date: 2005/08/17 14:34:58 $
  Version:   $Revision: 1.23 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkImageConstIteratorWithIndex_h
#define __itkImageConstIteratorWithIndex_h

#include "itkIndex.h"
#include "itkImage.h"
#include <memory>

namespace itk
{

template<typename TImage>
class ITK_EXPORT ImageConstIteratorWithIndex
{
public:
  typedef ImageConstIteratorWithIndex Self;

  itkStaticConstMacro(ImageDimension, unsigned int, TImage::ImageDimension);

  typedef typename TImage::IndexType          IndexType;
  typedef typename IndexType::IndexValueType  IndexValueType;

  typedef typename TImage::SizeType           SizeType;
  typedef typename SizeType::SizeValueType    SizeValueType;

  typedef typename TImage::RegionType         RegionType;

  typedef TImage   ImageType;

  typedef typename TImage::PixelContainer PixelContainer;
  typedef typename PixelContainer::Pointer PixelContainerPointer;
  
  typedef typename TImage::InternalPixelType   InternalPixelType;

  typedef typename TImage::PixelType   PixelType;

  typedef typename TImage::AccessorType            AccessorType;
  typedef typename TImage::AccessorFunctorType     AccessorFunctorType;

  typedef typename TImage::OffsetType           OffsetType;
  typedef typename OffsetType::OffsetValueType  OffsetValueType;

  ImageConstIteratorWithIndex();

  ImageConstIteratorWithIndex(const Self& it);

  ImageConstIteratorWithIndex( const TImage *ptr,
                               const RegionType& region );

  Self &operator=(const Self& it);
  
  static unsigned int GetImageDimension() 
    {return ImageDimension;}

  bool
  operator!=(const Self &it) const
    {
    // two iterators are the same if they "point to" the same memory location
    return (m_Position) != (it.m_Position);
    };

  bool
  operator==(const Self &it) const
    {
    // two iterators are the same if they "point to" the same memory location
    return (m_Position) == (it.m_Position);
    };
  
  bool
  operator<=(const Self &it) const
    {
    // an iterator is "less than" another if it "points to" a lower
    // memory location
    return (m_Position) <= (it.m_Position);
    };

  bool
  operator<(const Self &it) const
    {
    // an iterator is "less than" another if it "points to" a lower
    // memory location
    return (m_Position) < (it.m_Position);
    };

  bool
  operator>=(const Self &it) const
    {
    // an iterator is "greater than" another if it "points to" a higher
    // memory location
    return (m_Position) >= (it.m_Position);
    };

  bool
  operator>(const Self &it) const
    {
    // an iterator is "greater than" another if it "points to" a higher
    // memory location
    return (m_Position) > (it.m_Position);
    };

  const IndexType & GetIndex() const
    { return m_PositionIndex; }

  const RegionType& GetRegion() const
    { return m_Region; };

  void SetIndex(const IndexType &ind)
  { m_Position = m_Image->GetBufferPointer() + m_Image->ComputeOffset( ind ); 
      m_PositionIndex = ind;  }

  PixelType Get(void) const  
    { return m_PixelAccessorFunctor.Get(*m_Position); }
  
  const PixelType & Value(void) const  
    { return *m_Position; }
 
  Self Begin(void) const;

  void GoToBegin(void);

  Self End(void) const;

  void GoToReverseBegin(void);

  bool IsAtReverseEnd(void) const
    {
      return !m_Remaining;
    }

  bool IsAtEnd(void) const
    {
      return !m_Remaining;
    }
  
  bool Remaining()
    {
    return m_Remaining;
    }
  
protected: //made protected so other iterators can access 
  typename TImage::ConstWeakPointer     m_Image;
  
  IndexType    m_PositionIndex;     // Index where we currently are
  IndexType    m_BeginIndex;        // Index to start iterating over
  IndexType    m_EndIndex;          // Index to finish iterating:
                                    // one pixel past the end of each
                                    // row, col, slice, etc....

  RegionType   m_Region;            // region to iterate over

  unsigned long          m_OffsetTable[ ImageDimension + 1 ]; 
  
  const InternalPixelType     *m_Position;
  const InternalPixelType     *m_Begin;
  const InternalPixelType     *m_End;

  bool                         m_Remaining;

  AccessorType           m_PixelAccessor;
  AccessorFunctorType    m_PixelAccessorFunctor;

};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkImageConstIteratorWithIndex.txx"
#endif

#endif 

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