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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.
*
*=========================================================================*/
// Software Guide : BeginLatex
//
// We will describe how to use \doxygen{PointSet} as a \code{Sample}
// using an adaptor in this example.
//
// \index{itk::Sample!PointSetToListSampleAdaptor}
//
// \subdoxygen{Statistics}{PointSetToListSampleAdaptor} class requires the
// type of input \doxygen{PointSet} object. The \doxygen{PointSet} class is an
// associative data container. Each point in a \code{PointSet} object can have
// its associated data value (optional). For the statistics subsystem, current
// implementation of \code{PointSetToListSampleAdaptor} takes only the point
// part into consideration. In other words, the measurement vectors from a
// \code{PointSetToListSampleAdaptor} object are points from the
// \code{PointSet} object that is plugged-into the adaptor object.
//
// To use, an \doxygen{PointSetToListSampleAdaptor} object, we include the
// header file for the class.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkPointSetToListSampleAdaptor.h"
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Since, we are using an adaptor, we also include the header file for
// the \doxygen{PointSet} class.
//
// Software Guide :EndLatex
// Software Guide : BeginCodeSnippet
#include "itkPointSet.h"
// Software Guide : EndCodeSnippet
int
main()
{
// Software Guide : BeginLatex
//
// We assume you already know how to create an \doxygen{PointSet} object.
// The following code snippet will create a 2D image of float pixels filled
// with random values.
//
// Software Guide :EndLatex
// Software Guide : BeginCodeSnippet
using FloatPointSet2DType = itk::PointSet<float, 2>;
itk::RandomPointSetSource<FloatPointSet2DType>::Pointer random;
random = itk::RandomPointSetSource<FloatPointSet2DType>::New();
random->SetMin(0.0);
random->SetMax(1000.0);
unsigned long size[2] = { 20, 20 };
random->SetSize(size);
float spacing[2] = { 0.7, 2.1 };
random->SetSpacing(spacing);
float origin[2] = { 15, 400 };
random->SetOrigin(origin);
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// We now have an \doxygen{PointSet} object and need to cast it to an
// \doxygen{PointSet} object with array type (anything derived from
// the \doxygen{FixedArray} class) pixels.
//
// Since, the \doxygen{PointSet} object's pixel type is \code{float},
// We will use single element \code{float} \doxygen{FixedArray}
// as our measurement vector type. And that will also be our pixel
// type for the cast filter.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
using MeasurementVectorType = itk::FixedArray<float, 1>;
using ArrayPointSetType = itk::PointSet<MeasurementVectorType, 2>;
using CasterType = itk::ScalarToArrayCastPointSetFilter<FloatPointSet2DType,
ArrayPointSetType>;
auto caster = CasterType::New();
caster->SetInput(random->GetOutput());
caster->Update();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Up to now, we spend most of time to prepare an \doxygen{PointSet} object
// suitable for the adaptor. Actually, the hard part of this example is
// done. Now, we must define an adaptor with the image type and
// instantiate an object.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
using SampleType =
itk::Statistics::PointSetToListSampleAdaptor<ArrayPointSetType>;
auto sample = SampleType::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The final thing we have to is to plug-in the image object to the adaptor.
// After that, we can use the common methods and iterator interfaces
// shown in \ref{sec:SampleInterface}.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
sample->SetPointSet(caster->GetOutput());
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
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