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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_hxx
#define itkLevelSetTestFunction_hxx
namespace itk
{
template <typename TPixel>
auto
LevelSetTestFunction<TPixel>::Evaluate(const PointType & point) const -> OutputRealType
{
return static_cast<OutputRealType>(
std::sqrt((point[0] - 7.0) * (point[0] - 7.0) + (point[1] - 4.0) * (point[1] - 4.0)) - 3.0);
}
template <typename TPixel>
auto
LevelSetTestFunction<TPixel>::EvaluateGradient(const PointType & point) const -> GradientType
{
GradientType gradient;
gradient[0] = (point[0] - 7.0) / std::sqrt((point[0] - 7.0) * (point[0] - 7.0) + (point[1] - 4.0) * (point[1] - 4.0));
gradient[1] = (point[1] - 4.0) / std::sqrt((point[0] - 7.0) * (point[0] - 7.0) + (point[1] - 4.0) * (point[1] - 4.0));
return gradient;
}
} // end namespace itk
#endif
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