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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 ITK_TEMPLATE_EXPORT LevelSetTestFunction : public LightObject
{
public:
ITK_DISALLOW_COPY_AND_MOVE(LevelSetTestFunction);
using Self = LevelSetTestFunction;
using Superclass = LightObject;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
itkOverrideGetNameOfClassMacro(LevelSetTestFunction);
itkNewMacro(Self);
static constexpr unsigned int Dimension = 2;
using PixelType = TPixel;
using ImageType = Image<PixelType, Dimension>;
using IndexType = typename ImageType::IndexType;
using PointType = typename ImageType::PointType;
using OutputRealType = typename NumericTraits<PixelType>::RealType;
using GradientType = CovariantVector<OutputRealType, Dimension>;
using HessianType = Matrix<OutputRealType, Dimension>;
OutputRealType
Evaluate(const PointType & point) const;
GradientType
EvaluateGradient(const PointType & point) const;
protected:
LevelSetTestFunction() = default;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkLevelSetTestFunction.hxx"
#endif
#endif
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