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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageRegionConstIterator.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:39 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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DEF |
#ifndef _itkImageRegionConstIterator_txx |
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DEF |
#define _itkImageRegionConstIterator_txx |
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#include "itkImageRegionConstIterator.h" |
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namespace itk |
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{ |
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//---------------------------------------------------------------------------- |
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// Begin() is the first pixel in the region. |
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template<class TImage> |
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ImageRegionConstIterator<TImage> |
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ImageRegionConstIterator<TImage> |
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::Begin() const |
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{ |
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// Copy the current iterator |
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Self it( *this ); |
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// Set the iterator to the beginning of the region |
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it.GoToBegin(); |
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return it; |
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} |
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//---------------------------------------------------------------------------- |
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// End() is one pixel past the last pixel in the current region. |
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// The index of this pixel is |
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// [m_StartIndex[0] + m_Size[0], |
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// m_StartIndex[1] + m_Size[1]-1, ..., |
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// m_StartIndex[VImageDimension-2] + m_Size[VImageDimension-2]-1, |
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// m_StartIndex[VImageDimension-1] + m_Size[VImageDimension-1]-1] |
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// |
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template<class TImage> |
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ImageRegionConstIterator<TImage> |
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ImageRegionConstIterator<TImage> |
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::End() const |
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{ |
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// Copy the current iterator |
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Self it( *this ); |
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// Set the iterator to the end of the region |
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it.GoToEnd(); |
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return it; |
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} |
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//---------------------------------------------------------------------------- |
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// Increment when the fastest moving direction has reached its bound. |
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// This method should *ONLY* be invoked from the operator++() method. |
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template<class TImage> |
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void |
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ImageRegionConstIterator<TImage> |
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::Increment() |
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{ |
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// We have reached the end of the span (row), need to wrap around. |
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// First back up one pixel, because we are going to use a different |
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// algorithm to compute the next pixel |
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--this->m_Offset; |
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// Get the index of the last pixel on the span (row) |
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typename ImageIterator<TImage>::IndexType |
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LEN,IND |
****ind = this->m_Image->ComputeIndex( static_cast<typename Superclass::OffsetValueType>(this->m_Offset) ); |
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const typename ImageIterator<TImage>::IndexType& |
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IND |
****startIndex = this->m_Region.GetIndex(); |
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const typename ImageIterator<TImage>::SizeType& |
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IND |
****size = this->m_Region.GetSize(); |
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// Increment along a row, then wrap at the end of the region row. |
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unsigned int dim; |
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// Check to see if we are past the last pixel in the region |
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// Note that ++ind[0] moves to the next pixel along the row. |
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++ind[0]; |
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LEN |
bool done = (ind[0] == startIndex[0] + static_cast<typename Superclass::IndexValueType>(size[0])); |
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for (unsigned int i=1; done && i < ImageIteratorDimension; i++) |
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{ |
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LEN |
done = (ind[i] == startIndex[i] + static_cast<typename Superclass::IndexValueType>(size[i]) - 1); |
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} |
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// if the iterator is outside the region (but not past region end) then |
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// we need to wrap around the region |
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dim = 0; |
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if (!done) |
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{ |
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while ( ( dim+1 < ImageIteratorDimension ) |
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&& (ind[dim] > startIndex[dim] + static_cast<typename Superclass::IndexValueType>(size[dim]) - 1) ) |
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{ |
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ind[dim] = startIndex[dim]; |
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ind[++dim]++; |
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} |
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} |
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this->m_Offset = this->m_Image->ComputeOffset( ind ); |
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m_SpanEndOffset = this->m_Offset + static_cast<long>(size[0]); |
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m_SpanBeginOffset = this->m_Offset; |
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} |
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//---------------------------------------------------------------------------- |
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// Decrement when the fastest moving direction has reached its bound. |
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// This method should *ONLY* be invoked from the operator--() method. |
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template<class TImage> |
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void |
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ImageRegionConstIterator<TImage> |
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::Decrement() |
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{ |
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// We have pasted the beginning of the span (row), need to wrap around. |
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// First move forward one pixel, because we are going to use a different |
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// algorithm to compute the next pixel |
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this->m_Offset++; |
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// Get the index of the first pixel on the span (row) |
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typename ImageIterator<TImage>::IndexType |
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LEN,IND |
****ind = this->m_Image->ComputeIndex( static_cast<typename Superclass::IndexValueType>(this->m_Offset) ); |
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const typename ImageIterator<TImage>::IndexType& |
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IND |
****startIndex = this->m_Region.GetIndex(); |
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const typename ImageIterator<TImage>::SizeType& |
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IND |
****size = this->m_Region.GetSize(); |
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// Deccrement along a row, then wrap at the beginning of the region row. |
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bool done; |
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unsigned int dim; |
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// Check to see if we are past the first pixel in the region |
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// Note that --ind[0] moves to the previous pixel along the row. |
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done = (--ind[0] == startIndex[0] - 1); |
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for (unsigned int i=1; done && i < ImageIteratorDimension; i++) |
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{ |
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done = (ind[i] == startIndex[i]); |
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} |
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// if the iterator is outside the region (but not past region begin) then |
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// we need to wrap around the region |
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dim = 0; |
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if (!done) |
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{ |
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while ( (dim < ImageIteratorDimension - 1) |
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&& (ind[dim] < startIndex[dim]) ) |
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{ |
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LEN |
ind[dim] = startIndex[dim] + static_cast<typename Superclass::IndexValueType>(size[dim]) - 1; |
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ind[++dim]--; |
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} |
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} |
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this->m_Offset = this->m_Image->ComputeOffset( ind ); |
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m_SpanEndOffset = this->m_Offset + 1; |
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m_SpanBeginOffset = m_SpanEndOffset - static_cast<long>(size[0]); |
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} |
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} // end namespace itk |
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#endif |
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