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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkReflectiveImageRegionConstIterator.txx,v $
Language: C++
Date: $Date: 2004-12-21 22:47:30 $
Version: $Revision: 1.7 $
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 _itkReflectiveImageRegionConstIterator_txx
#define _itkReflectiveImageRegionConstIterator_txx
#include "itkReflectiveImageRegionConstIterator.h"
namespace itk
{
template<class TImage>
ReflectiveImageRegionConstIterator<TImage>
::ReflectiveImageRegionConstIterator() : ImageConstIteratorWithIndex<TImage>()
{
int i;
m_BeginOffset.Fill( 0 );
m_EndOffset.Fill( 0 );
this->GoToBegin();
}
template<class TImage>
ReflectiveImageRegionConstIterator<TImage>
::ReflectiveImageRegionConstIterator(TImage *ptr, const RegionType& region) :
ImageConstIteratorWithIndex<TImage>(ptr, region)
{
m_BeginOffset.Fill( 0 );
m_EndOffset.Fill( 0 );
this->GoToBegin();
}
template<class TImage>
ReflectiveImageRegionConstIterator<TImage>
::ReflectiveImageRegionConstIterator( const Self& it )
{
this->Operator=( it );
this->GoToBegin();
}
template<class TImage>
ReflectiveImageRegionConstIterator<TImage>
::ReflectiveImageRegionConstIterator(
const ImageConstIteratorWithIndex<TImage> &it)
{
this->ImageConstIteratorWithIndex<TImage>::operator=(it);
m_BeginOffset.Fill(0);
m_EndOffset.Fill(0);
}
template<class TImage>
ReflectiveImageRegionConstIterator<TImage> &
ReflectiveImageRegionConstIterator<TImage>
::operator=(const Self& it)
{
this->ImageConstIteratorWithIndex<TImage>::operator=(it);
m_BeginOffset = it.m_BeginOffset;
m_EndOffset = it.m_EndOffset;
return *this;
}
template<class TImage>
void
ReflectiveImageRegionConstIterator<TImage>
::GoToBegin( void )
{
this->m_PositionIndex = this->m_BeginIndex + this->m_BeginOffset;
this->m_Position = this->m_Image->GetBufferPointer() +
this->m_Image->ComputeOffset( this->m_PositionIndex );
this->m_Remaining = false;
for (unsigned int i=0; i < TImage::ImageDimension; ++i)
{
unsigned long size = this->m_Region.GetSize()[i];
if( size > 0 ) { this->m_Remaining = true; }
}
for(unsigned int i=0;i<TImage::ImageDimension;i++)
{
m_IsFirstPass[i] = true;
}
}
template<class TImage>
bool
ReflectiveImageRegionConstIterator<TImage>
::IsReflected(unsigned int dim) const
{
return !m_IsFirstPass[ dim ];
}
template<class TImage>
void
ReflectiveImageRegionConstIterator<TImage>
::FillOffsets(const OffsetValueType &value)
{
m_BeginOffset.Fill( value );
m_EndOffset.Fill( value );
}
//----------------------------------------------------------------------
// Advance along the line
//----------------------------------------------------------------------
template<class TImage>
ReflectiveImageRegionConstIterator<TImage> &
ReflectiveImageRegionConstIterator<TImage>
::operator++()
{
this->m_Remaining = false;
for( unsigned int in=0; in<TImage::ImageDimension; in++ )
{
if( m_IsFirstPass[ in ] )
{
this->m_PositionIndex[ in ]++;
if( this->m_PositionIndex[ in ] < this->m_EndIndex[ in ] )
{
this->m_Position += this->m_OffsetTable[in];
this->m_Remaining = true;
break;
}
else
{
this->m_PositionIndex[ in ] = this->m_EndIndex[ in ]-m_EndOffset[ in ]-1;
m_IsFirstPass[ in ] = false;
this->m_Remaining = true;
break;
}
}
else
{
this->m_PositionIndex[ in ]--;
if( this->m_PositionIndex[ in ] >= this->m_BeginIndex[ in ] )
{
this->m_Position -= this->m_OffsetTable[in];
this->m_Remaining = true;
break;
}
else
{
this->m_PositionIndex[ in ] = this->m_BeginIndex[ in ]+m_BeginOffset[ in ];
m_IsFirstPass[ in ] = true;
}
}
}
if( !this->m_Remaining ) // It will not advance here otherwise
{
this->m_Position = this->m_End;
}
return *this;
}
} // end namespace itk
#endif
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