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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 "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkPointSet.h"
#include "itkFEMScatteredDataPointSetToImageFilter.h"
#include "itkTestingMacros.h"
/**
* In this test, we create a simple 2D mesh and feature points to do evaluation.
*
* Example:
* The image is 5x5, the mesh is 2x2, and four feature points represent four
* cases: two points are on the boundary, one point is inside the element, and
* one point is the node.
*
* 4 ----------------
* | | | | |
* 3 |----|---|-------*
* | | | | |
* 2 |----|---*---|---|
* | | | | |
* 1 |----|---|---*---|
* | | | | |
* ----*-----------
* 0 1 2 3 4
*
*/
int
itkFEMScatteredDataPointSetToImageFilterTest(int, char *[])
{
constexpr unsigned int ParametricDimension = 2;
constexpr unsigned int DataDimension = 2;
using RealType = float;
using VectorType = itk::Vector<RealType, DataDimension>;
using MatrixType = itk::Matrix<RealType, DataDimension, DataDimension>;
using DeformationFieldType = itk::Image<VectorType, ParametricDimension>;
using FeaturePointSetType = itk::PointSet<VectorType, ParametricDimension>;
using TensorPointSetType = itk::PointSet<MatrixType, ParametricDimension>;
using ConfidencePointSetType = itk::PointSet<RealType, ParametricDimension>;
using MeshType = itk::Mesh<VectorType, ParametricDimension>;
using PointType = FeaturePointSetType::PointType;
using FilterType = itk::fem::FEMScatteredDataPointSetToImageFilter<FeaturePointSetType,
MeshType,
DeformationFieldType,
ConfidencePointSetType,
TensorPointSetType>;
using ConstIteratorType = itk::ImageRegionConstIterator<DeformationFieldType>;
auto filter = FilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, FEMScatteredDataPointSetToImageFilter, PointSetToImageFilter);
// Construct a feature point set
auto featurePoints = FeaturePointSetType::New();
PointType p0;
PointType p1;
PointType p2;
PointType p3;
// point is on the bottom boundary
p0[0] = 1.0;
p0[1] = 0.0;
// point is inside an element
p1[0] = 3.0;
p1[1] = 1.0;
// point is the node
p2[0] = 2.0;
p2[1] = 2.0;
// point is on the right boundary
p3[0] = 4.0;
p3[1] = 3.0;
VectorType u0;
VectorType u1;
VectorType u2;
VectorType u3;
u0[0] = 1.0;
u0[1] = 1.0;
u1[0] = 1.0;
u1[1] = 1.0;
u2[0] = 1.0;
u2[1] = 1.0;
u3[0] = 1.0;
u3[1] = 1.0;
featurePoints->SetPoint(0, p0);
featurePoints->SetPoint(1, p1);
featurePoints->SetPoint(2, p2);
featurePoints->SetPoint(3, p3);
featurePoints->SetPointData(0, u0);
featurePoints->SetPointData(1, u1);
featurePoints->SetPointData(2, u2);
featurePoints->SetPointData(3, u3);
// Set the feature point set
filter->SetInput(featurePoints);
// Set the parameters for a rectilinear mesh.
// Ignore this setting if users provide a mesh
DeformationFieldType::SpacingType elementSpacing;
elementSpacing[0] = 2.0;
elementSpacing[1] = 2.0;
filter->SetElementSpacing(elementSpacing);
ITK_TEST_SET_GET_VALUE(elementSpacing, filter->GetSpacingPerElement());
// Set the output
DeformationFieldType::SizeType size;
size[0] = 5;
size[1] = 5;
filter->SetSize(size);
DeformationFieldType::SpacingType spacing;
spacing[0] = 1.0;
spacing[1] = 1.0;
filter->SetSpacing(spacing);
DeformationFieldType::PointType origin;
origin[0] = 0.0;
origin[1] = 0.0;
filter->SetOrigin(origin);
filter->Update();
std::cout << "NumberOfElements: " << filter->GetNumberOfElements() << std::endl;
DeformationFieldType::Pointer DF = filter->GetOutput();
ConstIteratorType constIterator(DF, DF->GetRequestedRegion());
// examine the results
bool hasError = false;
VectorType realDisplacement;
realDisplacement[0] = 1.0;
realDisplacement[1] = 1.0;
for (constIterator.GoToBegin(); !constIterator.IsAtEnd(); ++constIterator)
{
VectorType simulatedDisplacement = constIterator.Get();
VectorType error = simulatedDisplacement - realDisplacement;
if (error.GetNorm() > 0.0001)
{
hasError = true;
}
}
if (hasError)
{
std::cout << "Test FAILED!" << std::endl;
return EXIT_FAILURE;
}
std::cout << "Test finished." << std::endl;
return EXIT_SUCCESS;
}
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