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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.
*
*=========================================================================*/
// First include the header file to be tested:
#include "itkSimilarity2DTransform.h"
#include "itkSimilarity3DTransform.h"
#include <gtest/gtest.h>
namespace
{
template <typename TTransform>
void
Test_SetCenterAndScale()
{
using PointType = typename TTransform::InputPointType;
const auto transform = TTransform::New();
for (double center{ -1.0 }; center <= 1.0; ++center)
{
transform->SetCenter(itk::MakeFilled<PointType>(center));
for (double scale{ 0.5 }; scale <= 2.0; scale *= 2.0)
{
transform->SetScale(scale);
for (double input{ -1.0 }; input <= 1.0; ++input)
{
EXPECT_EQ(transform->TransformPoint(itk::MakeFilled<PointType>(input)),
itk::MakeFilled<PointType>(center + (scale * (input - center))));
}
}
}
}
} // namespace
// Tests that `transform->TransformPoint` yields the expected result, when
// setting both the center and the scale (in that specific order), of the
// similarity transform. Note that in previous versions of ITK (including
// ITK 5.2.0), Similarity3DTransform did sometimes produce an incorrect result,
// as reported at https://github.com/InsightSoftwareConsortium/ITK/issues/2629
// "Similarity3DTransform::SetScale should recompute m_Offset"
TEST(SimilarityTransform, SetCenterAndScale)
{
Test_SetCenterAndScale<itk::Similarity2DTransform<>>();
Test_SetCenterAndScale<itk::Similarity3DTransform<>>();
}
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