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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkLevelSetTestFunction_h
#define itkLevelSetTestFunction_h
#include "itkLightObject.h"
#include "itkImage.h"
namespace itk
{
/**
* \class LevelSetTestFunction
*
* \brief A simple function to compare the numerical methods of the level set classes
* to the analytical values.
*
* \f$ f(x,y) = \sqrt{ (x-5)(x-5) + (y-4)(y-4) } - 3 \f$
*/
template< typename TPixel >
class LevelSetTestFunction: public LightObject
{
public:
typedef LevelSetTestFunction Self;
typedef LightObject Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
itkTypeMacro( LevelSetTestFunction, LightObject );
itkNewMacro( Self );
itkStaticConstMacro(Dimension, unsigned int, 2);
typedef TPixel PixelType;
typedef Image< PixelType, Dimension > ImageType;
typedef typename ImageType::IndexType IndexType;
typedef typename ImageType::PointType PointType;
typedef typename NumericTraits< PixelType >::RealType OutputRealType;
typedef CovariantVector< OutputRealType, Dimension > GradientType;
typedef Matrix< OutputRealType, Dimension > HessianType;
OutputRealType Evaluate( const PointType & point ) const;
GradientType EvaluateGradient( const PointType & point ) const;
protected:
LevelSetTestFunction() {}
private:
LevelSetTestFunction( const Self & ) ITK_DELETE_FUNCTION;
void operator=( const Self & ) ITK_DELETE_FUNCTION;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLevelSetTestFunction.hxx"
#endif
#endif
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