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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkPathConstIterator.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkPathConstIterator_txx
#define __itkPathConstIterator_txx
#include "itkPathConstIterator.h"
#include "itkOffset.h" // for operator++
namespace itk
{
template<class TImage, class TPath>
PathConstIterator<TImage, TPath>
::PathConstIterator(const ImageType *imagePtr, const PathType *pathPtr)
{
m_ZeroOffset.Fill(0);
m_Image = imagePtr;
m_Path = pathPtr;
m_ImageOrigin = m_Image->GetOrigin();
m_ImageSpacing = m_Image->GetSpacing();
m_Region = m_Image->GetLargestPossibleRegion();
m_ImageSize = m_Region.GetSize().m_Size;
m_VisitStartIndexAsLastIndexIfClosed=true;
GoToBegin();
}
template<class TImage, class TPath>
PathConstIterator<TImage, TPath> &
PathConstIterator<TImage, TPath>
::operator=(const Self & it)
{
m_Image = it.m_Image; // copy the smart pointer
m_Path = it.m_Path; // copy the smart pointer
m_Region = it.m_Region;
m_ImageOrigin = it.m_ImageOrigin;
m_ImageSpacing = it.m_ImageSpacing;
m_ImageSize = it.m_ImageSize;
m_CurrentPathPosition = it.m_CurrentPathPosition;
m_CurrentImageIndex = it.m_CurrentImageIndex;
m_VisitStartIndexAsLastIndexIfClosed=it.m_VisitStartIndexAsLastIndexIfClosed;
return *this;
}
template<class TImage, class TPath>
void
PathConstIterator<TImage, TPath>
::GoToBegin()
{
// Go the the beginning
m_CurrentPathPosition = m_Path->StartOfInput();
// But don't visit the first index twice for closed paths (unless told to)
if( m_VisitStartIndexAsLastIndexIfClosed )
{
// Are the first and last indices coincident?
if( m_Path->EvaluateToIndex(m_Path->EndOfInput()) ==
m_Path->EvaluateToIndex(m_Path->StartOfInput()) )
{
// Skip the starting index; we will visit it later.
m_Path->IncrementInput(m_CurrentPathPosition);
}
}
// Update the other member data
m_CurrentImageIndex = m_Path->EvaluateToIndex( m_CurrentPathPosition );
m_IsAtEnd = false;
}
template<class TImage, class TPath>
void
PathConstIterator<TImage, TPath>
::operator++()
{
// We need to modify m_CurrentPathPosition, m_CurrentImageIndex, m_IsAtEnd
OffsetType offset;
offset = m_Path->IncrementInput(m_CurrentPathPosition);
if( m_ZeroOffset == offset )
{
// We tried to go past the end (and we are still there)
m_IsAtEnd = true;
}
else if( ! m_Region.IsInside( m_CurrentImageIndex ) )
{
// The new index is outside the acceptable region. We can iterate no
// farther, call this the end. NOTE THAT INPUT IS STILL INCREMENTED.
m_IsAtEnd = true;
itkWarningMacro(<<"Path left region; unable to finish tracing it");
}
else
{
m_CurrentImageIndex += offset;
}
}
} // end namespace itk
#endif
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