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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageRegionIteratorWithIndex.h,v $
  Language:  C++
  Date:      $Date: 2005/08/12 14:02:58 $
  Version:   $Revision: 1.10 $

  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 __itkImageRegionIteratorWithIndex_h
#define __itkImageRegionIteratorWithIndex_h

#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkImageIteratorWithIndex.h"

namespace itk
{

/** \class ImageRegionIteratorWithIndex
 * \brief A multi-dimensional iterator templated over image type that walks
 * pixels within a region and is specialized to keep track of its image index
 * location.
 *
 * This class is a specialization of ImageRegionConstIteratorWithIndex that
 * adds write-access (the Set() method).  Please see
 * ImageRegionConstIteratorWithIndex for more information.
 *
 * \par MORE INFORMATION
 * For a complete description of the ITK Image Iterators and their API, please
 * see the Iterators chapter in the ITK Software Guide.  The ITK Software Guide
 * is available in print and as a free .pdf download from http://www.itk.org.
 *
 * \ingroup ImageIterators
 *
 * \sa ImageConstIterator \sa ConditionalConstIterator
 * \sa ConstNeighborhoodIterator \sa ConstShapedNeighborhoodIterator
 * \sa ConstSliceIterator  \sa CorrespondenceDataStructureIterator 
 * \sa FloodFilledFunctionConditionalConstIterator 
 * \sa FloodFilledImageFunctionConditionalConstIterator 
 * \sa FloodFilledImageFunctionConditionalIterator 
 * \sa FloodFilledSpatialFunctionConditionalConstIterator 
 * \sa FloodFilledSpatialFunctionConditionalIterator 
 * \sa ImageConstIterator \sa ImageConstIteratorWithIndex 
 * \sa ImageIterator \sa ImageIteratorWithIndex
 * \sa ImageLinearConstIteratorWithIndex  \sa ImageLinearIteratorWithIndex 
 * \sa ImageRandomConstIteratorWithIndex  \sa ImageRandomIteratorWithIndex 
 * \sa ImageRegionConstIterator \sa ImageRegionConstIteratorWithIndex 
 * \sa ImageRegionExclusionConstIteratorWithIndex 
 * \sa ImageRegionExclusionIteratorWithIndex 
 * \sa ImageRegionIterator  \sa ImageRegionIteratorWithIndex 
 * \sa ImageRegionReverseConstIterator  \sa ImageRegionReverseIterator 
 * \sa ImageReverseConstIterator  \sa ImageReverseIterator 
 * \sa ImageSliceConstIteratorWithIndex  \sa ImageSliceIteratorWithIndex 
 * \sa NeighborhoodIterator \sa PathConstIterator  \sa PathIterator 
 * \sa ShapedNeighborhoodIterator  \sa SliceIterator 
 * \sa ImageConstIteratorWithIndex */
template<typename TImage>
class ITK_EXPORT ImageRegionIteratorWithIndex : public ImageRegionConstIteratorWithIndex<TImage>
{
public:
  /** Standard class typedefs. */
  typedef ImageRegionIteratorWithIndex Self;
  typedef ImageRegionConstIteratorWithIndex<TImage>  Superclass;
  
  /** Types inherited from the Superclass */
  typedef typename Superclass::IndexType              IndexType;
  typedef typename Superclass::IndexValueType         IndexValueType;
  typedef typename Superclass::SizeType               SizeType;
  typedef typename Superclass::SizeValueType          SizeValueType;
  typedef typename Superclass::OffsetType             OffsetType;
  typedef typename Superclass::OffsetValueType        OffsetValueType;
  typedef typename Superclass::RegionType             RegionType;
  typedef typename Superclass::ImageType              ImageType;
  typedef typename Superclass::PixelContainer         PixelContainer;
  typedef typename Superclass::PixelContainerPointer  PixelContainerPointer;
  typedef typename Superclass::InternalPixelType      InternalPixelType;
  typedef typename Superclass::PixelType              PixelType;
  typedef typename Superclass::AccessorType           AccessorType;

  
  /** Default constructor. Needed since we provide a cast constructor. */
  ImageRegionIteratorWithIndex();
  
  /** Constructor establishes an iterator to walk a particular image and a
   * particular region of that image. */
  ImageRegionIteratorWithIndex(TImage *ptr, const RegionType& region);

  /** Constructor that can be used to cast from an ImageIterator to an
   * ImageRegionIteratorWithIndex. Many routines return an ImageIterator but for a
   * particular task, you may want an ImageRegionIteratorWithIndex.  Rather than
   * provide overloaded APIs that return different types of Iterators, itk
   * returns ImageIterators and uses constructors to cast from an
   * ImageIterator to a ImageRegionIteratorWithIndex. */
  ImageRegionIteratorWithIndex( const ImageIteratorWithIndex<TImage> &it);

  /** Set the pixel value */
  void Set( const PixelType & value) const  
    { this->m_PixelAccessorFunctor.Set(*(const_cast<InternalPixelType *>(this->m_Position)),value); }

  /** Return a reference to the pixel 
   * This method will provide the fastest access to pixel
   * data, but it will NOT support ImageAdaptors. */
  PixelType & Value(void) 
    { return *(const_cast<InternalPixelType *>(this->m_Position)); }
 
protected:
  /** the construction from a const iterator is declared protected
      in order to enforce const correctness. */
  ImageRegionIteratorWithIndex( const ImageRegionConstIteratorWithIndex<TImage> &it);
  Self &operator=(const ImageRegionConstIteratorWithIndex<TImage> & it);
  
};

} // end namespace itk

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

#endif 
