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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 "itkEuclideanDistanceMetric.h"
int
itkEuclideanDistanceMetricTest(int, char *[])
{
constexpr unsigned int MeasurementVectorSize = 3;
using MeasurementVectorType = itk::Array<float>;
using DistanceMetricType = itk::Statistics::EuclideanDistanceMetric<MeasurementVectorType>;
auto distance = DistanceMetricType::New();
std::cout << distance->GetNameOfClass() << std::endl;
distance->Print(std::cout);
MeasurementVectorType measurementNew;
itk::NumericTraits<MeasurementVectorType>::SetLength(measurementNew, 3);
measurementNew[0] = 2.5;
measurementNew[1] = 3.3;
measurementNew[2] = 4.0;
// Attempting to compute distance before setting a measurement vector should
// throw an exception
try
{
distance->Evaluate(measurementNew);
std::cerr << "Attempting to compute distance w/o setting measurement vector"
"size, Exception should have been thrown"
<< std::endl;
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << "Exception: " << excp << std::endl;
}
distance->SetMeasurementVectorSize(MeasurementVectorSize);
if (distance->GetMeasurementVectorSize() != MeasurementVectorSize)
{
std::cerr << "GetMeasurementVectorSize() Failed !" << std::endl;
return EXIT_FAILURE;
}
// Test if the distance computed is correct
DistanceMetricType::OriginType origin;
itk::NumericTraits<DistanceMetricType::OriginType>::SetLength(origin, 3);
origin[0] = 1.5;
origin[1] = 2.3;
origin[2] = 1.0;
distance->SetOrigin(origin);
MeasurementVectorType measurement;
itk::NumericTraits<MeasurementVectorType>::SetLength(measurement, 3);
measurement[0] = 2.5;
measurement[1] = 3.3;
measurement[2] = 4.0;
double trueValue = 3.31662;
double distanceComputed = distance->Evaluate(measurement);
constexpr double tolerance = 0.001;
if (itk::Math::abs(distanceComputed - trueValue) > tolerance)
{
std::cerr << "Distance computed not correct: "
<< "truevalue= " << trueValue << "ComputedValue=" << distanceComputed << std::endl;
return EXIT_FAILURE;
}
// Compute distance between two measurement vectors
MeasurementVectorType measurement2;
itk::NumericTraits<MeasurementVectorType>::SetLength(measurement2, 3);
measurement2[0] = 1.5;
measurement2[1] = 3.5;
measurement2[2] = 3.5;
double trueValue2 = 1.136;
double distanceComputed2 = distance->Evaluate(measurement, measurement2);
if (itk::Math::abs(distanceComputed2 - trueValue2) > tolerance)
{
std::cerr << "Distance computed not correct: "
<< "truevalue= " << trueValue2 << "ComputedValue=" << distanceComputed2 << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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