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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkChainCodePath.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 __itkChainCodePath_txx
#define __itkChainCodePath_txx
#include "itkChainCodePath.h"
#include "itkNumericTraits.h"
namespace itk
{
template <unsigned int VDimension>
typename ChainCodePath<VDimension>::IndexType
ChainCodePath<VDimension>
::EvaluateToIndex( const InputType & input ) const
{
/* We could do something fancy here, such as "secretly" store the input and
* total offset from the last time this function was called, and use such
* information to speed up quasi-sequential access. We would have to be
* really, really careful about how we handle the "secret" member data,
* though.
**********************************
* Begin broken, uncompiled Code. *
**********************************
int numberOfSteps = input - m_CurrentPosition;
if( numberOfSteps > 0 )
{
const unsigned int steps = numberOfSteps;
for(unsigned int i=0; i<steps; i++)
{
this->operator++();
}
}
else
{
const unsigned int steps = -numberOfSteps;
for(unsigned int i=0; i<steps; i++)
{
this->operator--();
}
}
return m_CurrentIndex;
***********************************
* End of broken, uncompiled Code. *
**********************************/
IndexType index = m_Start;
// Iterate through the chaincode, summing the offsets as we go.
for(InputType i=0; i<input; i++)
{
index += m_Chain[i];
}
return index;
}
template <unsigned int VDimension>
typename ChainCodePath<VDimension>::OffsetType
ChainCodePath<VDimension>
::IncrementInput(InputType & input ) const
{
if( input < NumberOfSteps() )
{
return m_Chain[input++];
}
else
{
return this->GetZeroOffset();
}
}
/** Constructor */
template <unsigned int VDimension>
ChainCodePath<VDimension>
::ChainCodePath()
{
m_Start = this->GetZeroIndex();
}
/** Standard "PrintSelf" method */
template <unsigned int VDimension>
void
ChainCodePath<VDimension>
::PrintSelf( std::ostream& os, Indent indent) const
{
Superclass::PrintSelf( os, indent );
os << indent << "Start index: " << m_Start << std::endl;
}
} // end namespace itk
#endif
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