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itk::ImageRegionConstIteratorWithIndex< TImage > Class Template Reference
[Image Iterators]

Multi-dimensional image iterator which only walks a region. More...

#include <itkImageRegionConstIteratorWithIndex.h>

Inheritance diagram for itk::ImageRegionConstIteratorWithIndex< TImage >:

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List of all members.

Public Types

typedef ImageRegionConstIteratorWithIndex Self
typedef ImageConstIteratorWithIndex<
TImage > 
Superclass
typedef TImage::IndexType IndexType
typedef TImage ImageType
typedef TImage::PixelContainer PixelContainer
typedef PixelContainer::Pointer PixelContainerPointer
typedef TImage::RegionType RegionType

Public Member Functions

 ImageRegionConstIteratorWithIndex ()
 ImageRegionConstIteratorWithIndex (const TImage *ptr, const RegionType &region)
 ImageRegionConstIteratorWithIndex (const ImageConstIteratorWithIndex< TImage > &it)
Selfoperator++ ()
Selfoperator-- ()

Detailed Description

template<typename TImage>
class itk::ImageRegionConstIteratorWithIndex< TImage >

Multi-dimensional image iterator which only walks a region.

ImageRegionConstIteratorWithIndex is a templated class to represent a multi-dimensional iterator. ImageRegionConstIteratorWithIndex is templated over the image type. ImageRegionConstIteratorWithIndex is constrained to walk only within the specified region.

ImageRegionConstIteratorWithIndex is a multi-dimensional iterator, requiring more information be specified before the iterator can be used than conventional iterators. Whereas the std::vector::iterator from the STL only needs to be passed a pointer to establish the iterator, the multi-dimensional image iterator needs a pointer, the size of the buffer, the size of the region, the start index of the buffer, and the start index of the region. To gain access to this information, ImageRegionConstIteratorWithIndex holds a reference to the image over which it is traversing.

ImageRegionConstIteratorWithIndex assumes a particular layout of the image data. The is arranged in a 1D array as if it were [][][][slice][row][col] with Index[0] = col, Index[1] = row, Index[2] = slice, etc.

operator++ provides a simple syntax for walking around a region of a multidimensional image. operator++ iterates across a row, constraining the movement to within a region of image. When the iterator reaches the boundary of the region along a row, the iterator automatically wraps to the next row, starting at the first pixel in the row that is part of the region. This allows for simple processing loops of the form:

  IteratorType it( image, image->GetRequestedRegion() );

  it.Begin();

  while( ! it.IsAtEnd() ) 
  {  
    it.Set( 100.0 + it.Get() );
    ++it;
  }

It also can be used for walking in the reverse direction like

  IteratorType it( image, image->GetRequestedRegion() );

  it.End();

  while( !it.IsAtBegin() ) 
  {  
    it.Set( 100.0 );
    --it;
  }

Definition at line 89 of file itkImageRegionConstIteratorWithIndex.h.


Member Typedef Documentation

template<typename TImage>
typedef TImage itk::ImageRegionConstIteratorWithIndex< TImage >::ImageType
 

Image typedef support. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc. Note that we have to rescope Image back to itk::Image to that is it not confused with ImageIterator::Image.

Reimplemented from itk::ImageConstIteratorWithIndex< TImage >.

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 106 of file itkImageRegionConstIteratorWithIndex.h.

template<typename TImage>
typedef TImage::IndexType itk::ImageRegionConstIteratorWithIndex< TImage >::IndexType
 

Index typedef support. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc. Note that we have to rescope Index back to itk::Index to that is it not confused with ImageIterator::Index.

Reimplemented from itk::ImageConstIteratorWithIndex< TImage >.

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 100 of file itkImageRegionConstIteratorWithIndex.h.

template<typename TImage>
typedef TImage::PixelContainer itk::ImageRegionConstIteratorWithIndex< TImage >::PixelContainer
 

PixelContainer typedef support. Used to refer to the container for the pixel data. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc.

Reimplemented from itk::ImageConstIteratorWithIndex< TImage >.

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 111 of file itkImageRegionConstIteratorWithIndex.h.

template<typename TImage>
typedef PixelContainer::Pointer itk::ImageRegionConstIteratorWithIndex< TImage >::PixelContainerPointer
 

Reimplemented from itk::ImageConstIteratorWithIndex< TImage >.

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 112 of file itkImageRegionConstIteratorWithIndex.h.

template<typename TImage>
typedef TImage::RegionType itk::ImageRegionConstIteratorWithIndex< TImage >::RegionType
 

Region typedef support. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc. Note that we have to rescope Region back to itk::ImageRegion so that is it not confused with ImageIterator::Index.

Reimplemented from itk::ImageConstIteratorWithIndex< TImage >.

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 118 of file itkImageRegionConstIteratorWithIndex.h.

Referenced by itk::ImageRegionConstIteratorWithIndex< TImage >::ImageRegionConstIteratorWithIndex().

template<typename TImage>
typedef ImageRegionConstIteratorWithIndex itk::ImageRegionConstIteratorWithIndex< TImage >::Self
 

Standard class typedefs.

Reimplemented from itk::ImageConstIteratorWithIndex< TImage >.

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 93 of file itkImageRegionConstIteratorWithIndex.h.

template<typename TImage>
typedef ImageConstIteratorWithIndex<TImage> itk::ImageRegionConstIteratorWithIndex< TImage >::Superclass
 

Reimplemented in itk::ImageRegionIteratorWithIndex< TImage >.

Definition at line 94 of file itkImageRegionConstIteratorWithIndex.h.


Constructor & Destructor Documentation

template<typename TImage>
itk::ImageRegionConstIteratorWithIndex< TImage >::ImageRegionConstIteratorWithIndex  )  [inline]
 

Default constructor. Needed since we provide a cast constructor. Definition at line 121 of file itkImageRegionConstIteratorWithIndex.h.

template<typename TImage>
itk::ImageRegionConstIteratorWithIndex< TImage >::ImageRegionConstIteratorWithIndex const TImage *  ptr,
const RegionType region
[inline]
 

Constructor establishes an iterator to walk a particular image and a particular region of that image. Definition at line 125 of file itkImageRegionConstIteratorWithIndex.h.

References itk::ImageRegionConstIteratorWithIndex< TImage >::RegionType.

template<typename TImage>
itk::ImageRegionConstIteratorWithIndex< TImage >::ImageRegionConstIteratorWithIndex const ImageConstIteratorWithIndex< TImage > &  it  )  [inline]
 

Constructor that can be used to cast from an ImageIterator to an ImageRegionConstIteratorWithIndex. Many routines return an ImageIterator but for a particular task, you may want an ImageRegionConstIteratorWithIndex. Rather than provide overloaded APIs that return different types of Iterators, itk returns ImageIterators and uses constructors to cast from an ImageIterator to a ImageRegionConstIteratorWithIndex. Definition at line 135 of file itkImageRegionConstIteratorWithIndex.h.


Member Function Documentation

template<typename TImage>
Self& itk::ImageRegionConstIteratorWithIndex< TImage >::operator++  ) 
 

Increment (prefix) the fastest moving dimension of the iterator's index. This operator will constrain the iterator within the region (i.e. the iterator will automatically wrap from the end of the row of the region to the beginning of the next row of the region) up until the iterator tries to moves past the last pixel of the region. Here, the iterator will be set to be one pixel past the end of the region.

See also:
operator--

template<typename TImage>
Self& itk::ImageRegionConstIteratorWithIndex< TImage >::operator--  ) 
 

Decrement (prefix) the fastest moving dimension of the iterator's index. This operator will constrain the iterator within the region (i.e. the iterator will automatically wrap from the beginning of the row of the region to the end of the previous row of the region) up until the iterator tries to moves past the first pixel of the region. Here, the iterator will be set to be one pixel past the beginning of the region.

See also:
operator++


The documentation for this class was generated from the following file:
Generated at Sat Mar 31 02:55:21 2007 for ITK by doxygen 1.3.8 written by Dimitri van Heesch, © 1997-2000