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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.
*
*=========================================================================*/
#include "itkMath.h"
#include "itkDerivativeOperator.h"
#include "itkTestingMacros.h"
namespace itk
{
template <typename TPixel, unsigned int VDimension = 2>
class DerivativeOperatorTestHelper : public DerivativeOperator<TPixel, VDimension>
{
public:
using Superclass = DerivativeOperator<TPixel, VDimension>;
using typename Superclass::CoefficientVector;
bool
CheckCoefficients(const CoefficientVector & expected)
{
CoefficientVector coefficients = this->GenerateCoefficients();
if (itk::Math::NotAlmostEquals(expected.size(), coefficients.size()))
{
std::cerr << "Wrong coefficient vector size" << std::endl;
std::cerr << "expected " << expected.size() << std::endl;
std::cerr << "computed " << coefficients.size() << std::endl;
return false;
}
for (unsigned int i = 0; i < expected.size(); ++i)
{
if (itk::Math::NotAlmostEquals(expected[i], coefficients[i]))
{
std::cerr << "Wrong coefficient value at " << i << std::endl;
std::cerr << "expected " << expected[i] << std::endl;
std::cerr << "computed " << coefficients[i] << std::endl;
return false;
}
}
return true;
}
};
} // namespace itk
int
itkDerivativeOperatorTest(int, char *[])
{
constexpr unsigned int Dimension = 1;
using PixelType = float;
// Exercise object basic methods
using DerivativeOperatorType = itk::DerivativeOperator<PixelType, Dimension>;
DerivativeOperatorType derivativeOperator;
ITK_EXERCISE_BASIC_OBJECT_METHODS((&derivativeOperator), DerivativeOperator, NeighborhoodOperator);
// Test other methods using the helper
using OperatorType = itk::DerivativeOperatorTestHelper<PixelType, Dimension>;
OperatorType op1;
unsigned int order = 1;
op1.SetOrder(order);
ITK_TEST_SET_GET_VALUE(order, op1.GetOrder());
order = 2;
op1.SetOrder(order);
ITK_TEST_SET_GET_VALUE(order, op1.GetOrder());
order = 1;
op1.SetOrder(order);
ITK_TEST_SET_GET_VALUE(order, op1.GetOrder());
OperatorType::CoefficientVector expected1;
expected1.push_back(0.5);
expected1.push_back(0.0);
expected1.push_back(-0.5);
// Check actual coefficient values
if (!op1.CheckCoefficients(expected1))
{
std::cerr << "Test failed!" << std::endl;
std::cerr << "Error in coefficients" << std::endl;
return EXIT_FAILURE;
}
// Test copy constructor
OperatorType op1b(op1);
// Check actual coefficient values
if (!op1b.CheckCoefficients(expected1))
{
std::cerr << "Test failed!" << std::endl;
std::cerr << "Copy constructor failed" << std::endl;
return EXIT_FAILURE;
}
// Test operator assignment
OperatorType op1c(op1);
// Check actual coefficient values
if (!op1c.CheckCoefficients(expected1))
{
std::cerr << "Test failed!" << std::endl;
std::cerr << "Operator assignment failed" << std::endl;
return EXIT_FAILURE;
}
// Test second order
OperatorType::CoefficientVector expected2;
expected2.push_back(1);
expected2.push_back(-2);
expected2.push_back(1);
OperatorType op2;
op2.SetOrder(2);
// Check actual coefficient values
if (!op2.CheckCoefficients(expected2))
{
std::cerr << "Test failed!" << std::endl;
std::cerr << "Error in coefficients" << std::endl;
return EXIT_FAILURE;
}
std::cout << "Test finished." << std::endl;
return EXIT_SUCCESS;
}
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