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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkEuclideanDistance.txx,v $
Language: C++
Date: $Date: 2009-03-04 15:23:47 $
Version: $Revision: 1.13 $
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 __itkEuclideanDistance_txx
#define __itkEuclideanDistance_txx
namespace itk {
namespace Statistics {
template< class TVector >
inline double
EuclideanDistance< TVector >
::Evaluate(const TVector &x1, const TVector &x2) const
{
if( MeasurementVectorTraits::GetLength( x1 ) !=
MeasurementVectorTraits::GetLength( x2 ) )
{
itkExceptionMacro( << "Vector lengths must be equal." );
}
double temp, distance = NumericTraits< double >::Zero;
for(unsigned int i = 0; i < x1.Size(); i++ )
{
temp = x1[i] - x2[i];
distance += temp * temp;
}
return vcl_sqrt(distance);
}
template< class TVector >
inline double
EuclideanDistance< TVector >
::Evaluate(const TVector &x) const
{
MeasurementVectorSizeType
measurementVectorSize = this->GetMeasurementVectorSize();
if(measurementVectorSize == 0)
{
itkExceptionMacro( << "Please set the MeasurementVectorSize first" );
}
MeasurementVectorTraits::Assert( this->m_Origin, measurementVectorSize,
"EuclideanDistance::Evaluate Origin and input vector have different lengths");
double temp, distance = NumericTraits< double >::Zero;
for(unsigned int i = 0; i < measurementVectorSize; i++ )
{
temp = this->GetOrigin()[i] - x[i];
distance += temp * temp;
}
return vcl_sqrt(distance);
}
template< class TVector >
inline double
EuclideanDistance< TVector >
::Evaluate(const ValueType &a, const ValueType &b) const
{
double temp = a - b;
return vcl_sqrt(temp * temp);
}
template< class TVector >
inline bool
EuclideanDistance< TVector >
::IsWithinRange(const TVector &x, const double radius) const
{
MeasurementVectorSizeType
measurementVectorSize = this->GetMeasurementVectorSize();
if(measurementVectorSize == 0)
{
itkExceptionMacro( << "Please set the MeasurementVectorSize first" );
}
MeasurementVectorTraits::Assert( this->m_Origin, measurementVectorSize,
"EuclideanDistance::IsWithinRange Origin and input vector have different lengths");
double squaredRadius = radius * radius;
double sum = NumericTraits< double >::Zero;
double temp;
for ( unsigned int i = measurementVectorSize; i > 0; --i )
{
temp = this->Evaluate( this->GetOrigin()[i-1], x[i-1] );
sum += temp * temp;
if (sum > squaredRadius)
{
return false;
}
}
return true;
}
} // end of namespace Statistics
} // end of namespace itk
#endif
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