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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 "itkSphereSignedDistanceFunction.h"
/**
* This module tests the functionaliyt of the SphereSignedDistanceFunction
* class and its superclass ShapeSignedDistanceFunction.
*
* In particular, it creates a SphereSignedDistanceFunction object
* cast it to a generic ShapeSignedDistanceFunction object.
*
* The shape parameters are set at radius of 5 and center of (0,0).
* The signed distance is evaluated at several point and compared
* to expected values. The test fails if the evaluated results is
* not within a certain tolerance of the expected results.
*
*/
int
itkSphereSignedDistanceFunctionTest(int, char *[])
{
using CoordRep = double;
constexpr unsigned int Dimension = 2;
using FunctionType = itk::ShapeSignedDistanceFunction<CoordRep, Dimension>;
using SphereFunctionType = itk::SphereSignedDistanceFunction<CoordRep, Dimension>;
using PointType = FunctionType::PointType;
using ParametersType = FunctionType::ParametersType;
auto sphere = SphereFunctionType::New();
// cast it to a generic function
FunctionType::Pointer function = dynamic_cast<FunctionType *>(sphere.GetPointer());
sphere = nullptr;
// we must initialize the function before use
function->Initialize();
ParametersType parameters(function->GetNumberOfParameters());
parameters.Fill(0.0);
parameters[0] = 5.0;
function->SetParameters(parameters);
std::cout << "Parameters: " << function->GetParameters() << std::endl;
PointType point;
function->Print(std::cout);
std::cout << function->FunctionType::GetNameOfClass() << std::endl;
for (double p = 0.0; p < 10.0; p += 1.0)
{
point.Fill(p);
FunctionType::OutputType output = function->Evaluate(point);
std::cout << "f( " << point << ") = " << output << std::endl;
// check results
CoordRep expected = p * std::sqrt(2.0) - parameters[0];
if (itk::Math::abs(output - expected) > 1e-9)
{
std::cout << "But expected value is: " << expected << std::endl;
return EXIT_FAILURE;
}
}
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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