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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 <iostream>
#include "itkImageRegionIterator.h"
#include "itkPolyLineParametricPath.h"
#include "itkPathFunctions.h"
#include "itkPathIterator.h"
#include "itkTestingMacros.h"
int
itkPathFunctionsTest(int, char *[])
{
constexpr unsigned int Dimension = 2;
using PixelType = double;
using ImageType = itk::Image<PixelType, Dimension>;
using PolyLineParametricPathType = itk::PolyLineParametricPath<Dimension>;
using ChainPathType = itk::ChainCodePath<Dimension>;
using FourierSeriesPathType = itk::FourierSeriesPath<Dimension>;
using PathIteratorType = itk::PathIterator<ImageType, FourierSeriesPathType>;
using IndexType = ImageType::IndexType;
using VertexType = PolyLineParametricPathType::VertexType;
bool passed = true;
// Set up the image
std::cout << "Making a 64x64 white square centered in a 128x128 black image" << std::endl;
auto image = ImageType::New();
IndexType start;
start[0] = 0;
start[1] = 0;
ImageType::SizeType size;
size[0] = 128;
size[1] = 128;
ImageType::RegionType region{ start, size };
image->SetRegions(region);
double spacing[ImageType::ImageDimension];
spacing[0] = 1.0;
spacing[1] = 1.0;
image->SetSpacing(spacing);
image->Allocate();
using ImageRegionIteratorType = itk::ImageRegionIterator<ImageType>;
ImageRegionIteratorType it(image, image->GetRequestedRegion());
it.GoToBegin();
ImageType::PixelType storedValue;
IndexType pixelIndex;
while (!it.IsAtEnd())
{
pixelIndex = it.GetIndex();
if (pixelIndex[0] >= static_cast<int>(size[0] / 4) && pixelIndex[0] < static_cast<int>(size[0] * 3 / 4) &&
pixelIndex[1] >= static_cast<int>(size[1] / 4) && pixelIndex[1] < static_cast<int>(size[1] * 3 / 4))
{
it.Set(1.0);
}
else
{
it.Set(0.0);
}
++it;
}
// Retrieve and print the value stored at pixel index (32,32)
pixelIndex[0] = 32;
pixelIndex[1] = 32;
storedValue = image->GetPixel(pixelIndex);
std::cout << "The pixel at index (" << pixelIndex[0] << ',' << pixelIndex[1] << ") has the value " << storedValue
<< ".\n"
<< std::endl;
// Set up the path
std::cout << "Making a square Path with v0 at (30,30) and v2 at (33,33)" << std::endl;
VertexType v;
auto inPath = PolyLineParametricPathType::New();
auto chainPath = ChainPathType::New();
auto path = FourierSeriesPathType::New();
v.Fill(30);
inPath->AddVertex(v);
v[0] = 33;
v[1] = 30;
inPath->AddVertex(v);
v.Fill(33);
inPath->AddVertex(v);
v[0] = 30;
v[1] = 33;
inPath->AddVertex(v);
v.Fill(30);
inPath->AddVertex(v);
itk::MakeChainCodeTracePath(*chainPath, *inPath);
std::cout << "New ChainCodePath has " << chainPath->NumberOfSteps() << " steps." << std::endl;
itk::MakeFourierSeriesPathTraceChainCode(*path, *chainPath, 2);
// Test the iterator
std::cout << "Creating an iterator to trace the FourierSeriesPath" << std::endl;
PathIteratorType iter(image, path);
for (iter.GoToBegin(); !iter.IsAtEnd(); ++iter)
{
std::cout << "Path(" << iter.GetPathPosition() << ") @ " << iter.GetIndex() << " = " << iter.Get()
<< "; Now inverting." << std::endl;
iter.Set(1.0 - iter.Get());
}
for (iter.GoToBegin(); !iter.IsAtEnd(); ++iter)
{
std::cout << "Path(" << iter.GetPathPosition() << ") @ " << iter.GetIndex() << " = " << iter.Get() << std::endl;
}
std::cout << "Should still be at end: ";
std::cout << "Path(" << iter.GetPathPosition() << ") @ " << iter.GetIndex() << " = " << iter.Get() << std::endl;
if ((iter.GetIndex())[0] != 30 || (iter.GetIndex())[1] != 30)
{
std::cout << "PathFunctionsTest: Failed to maintain a closed path" << std::endl;
passed = false;
}
if (passed)
{
std::cout << "Test passed" << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cout << "Test failed" << std::endl;
return EXIT_FAILURE;
}
}
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