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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkEuclideanDistance.h
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 __itkEuclideanDistance_h
#define __itkEuclideanDistance_h
#include "itkNumericTraits.h"
#include "itkDistanceMetric.h"
#include "itkMeasurementVectorTraits.h"
namespace itk {
namespace Statistics {
/** \class EuclideanDistance
* \brief Euclidean distance function.
*
* This class is derived from DistanceMetric class. In addition to the
* two Evaluate methods in the base class, this class has a method
* (Evaluate) to compute the coordinate distance between two vector
* component (not vectors), and a method to tell if a measurement
* vector is whithin the range (defined by a radius value) from the
* origin (set by SetOrigin mehtod).
*
* The class can be templated over any container that holds data elements. The
* containter is expected to provide access to its elements with the [] operator.
* It must also implement a Size() that returns the length of the container.
* It must also contain a typedef "ValueType" that defines the data-type held
* by the container.
* (In other words it will support itk::Vector, FixedArray, Array ).
*
* <b>Recent API changes:</b>
* The static const macro to get the length of a measurement vector,
* \c VectorLength has been removed to allow the length of a measurement
* vector to be specified at run time. Please use the function
* GetMeasurementVectorSize() instead.
*
*/
template< class TVector >
class ITK_EXPORT EuclideanDistance :
public DistanceMetric< TVector >
{
public:
/** Standard "Self" typedef. */
typedef EuclideanDistance Self;
typedef DistanceMetric< TVector > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer<const Self> ConstPointer;
typedef typename Superclass::MeasurementVectorSizeType MeasurementVectorSizeType;
/** Run-time type information (and related methods). */
itkTypeMacro(EuclideanDistance, DistanceMetric);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Type of the component of a vector */
typedef typename TVector::ValueType ValueType;
/** Gets the distance between the origin and x */
double Evaluate(const TVector &x) const;
/** Gets the distance between x1 and x2 */
double Evaluate(const TVector &x1, const TVector &x2) const;
/** Gets the cooridnate distance between a and b. NOTE: a and b
* should be type of component */
double Evaluate(const ValueType &a, const ValueType &b) const;
/** Returns true if the distance between x and the origin is less
* than radius */
bool IsWithinRange(const TVector &x, const double radius) const;
protected:
EuclideanDistance() {}
virtual ~EuclideanDistance() {}
}; // end of class
} // end of namespace Statistics
} // end of namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkEuclideanDistance.txx"
#endif
#endif
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