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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.
*
*=========================================================================*/
#ifndef itkImageToRectilinearFEMObjectFilter_h
#define itkImageToRectilinearFEMObjectFilter_h
#include "vnl/vnl_vector.h"
#include "itkFEMObject.h"
#include "itkProcessObject.h"
namespace itk
{
namespace fem
{
/**
* \class ImageToRectilinearFEMObjectFilter
* \brief Generate a rectilinear mesh from an image. The result is stored
* in a FEMObject
*
* This class generates a Mesh consisting of quadrilateral elements in 2D
* and hexahedral elements in 3D. The resulting meshes can be used with
* specific elements for solving membrane or linear elasticity problems.
*
* \ingroup ITKFEM
*/
template <typename TInputImage>
class ITK_TEMPLATE_EXPORT ImageToRectilinearFEMObjectFilter : public ProcessObject
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ImageToRectilinearFEMObjectFilter);
/** Standard class type aliases. */
using Self = ImageToRectilinearFEMObjectFilter;
using Superclass = ProcessObject;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ImageToRectilinearFEMObjectFilter);
static constexpr unsigned int NDimensions = TInputImage::ImageDimension;
/** Typedefs for Input Image */
using InputImageType = TInputImage;
using ImagePointer = typename InputImageType::Pointer;
using ImageConstPointer = typename InputImageType::ConstPointer;
using ImageRegionType = typename InputImageType::RegionType;
using ImageSizeType = typename InputImageType::SizeType;
using ImagePointType = typename InputImageType::PointType;
using ImageIndexType = typename InputImageType::IndexType;
/** Typedefs for Output FEMObject */
using FEMObjectType = typename itk::fem::FEMObject<NDimensions>;
using FEMObjectPointer = typename FEMObjectType::Pointer;
using FEMObjectConstPointer = typename FEMObjectType::ConstPointer;
using DataObjectPointer = typename DataObject::Pointer;
/** Some convenient type alias. */
using MaterialType = itk::fem::MaterialLinearElasticity;
using MaterialPointerType = MaterialType::Pointer;
// using QuadElementBaseType = itk::fem::Element2DC0LinearQuadrilateral;
// using HexElementBaseType = itk::fem::Element3DC0LinearHexahedron;
using ElementBaseType = itk::fem::Element;
using ElementBasePointerType = itk::fem::Element::ConstPointer;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
// itkConceptMacro(SameDimensionOrMinusOne,
// (Concept::SameDimensionOrMinusOne<VDimension, 3>));
// End concept checking
#endif
/**Get/Set the number of voxels/pixels in each dimension used
*during the mesh generation
*/
itkGetMacro(PixelsPerElement, vnl_vector<unsigned int>);
itkSetMacro(PixelsPerElement, vnl_vector<unsigned int>);
void
SetPixelsPerElement(unsigned int numPixels)
{
this->m_PixelsPerElement.fill(numPixels);
}
/**Get the number of element in each dimension of the generated mesh*/
itkGetMacro(NumberOfElements, vnl_vector<unsigned int>);
/**Get/Set the material used for the mesh. */
itkGetMacro(Material, MaterialPointerType);
itkSetMacro(Material, MaterialPointerType);
/**Get/Set the element type used to generate the mesh. */
itkGetMacro(Element, ElementBasePointerType);
itkSetMacro(Element, ElementBasePointerType);
/** Set/Get the input image. */
using Superclass::SetInput;
void
SetInput(InputImageType * image);
void
SetInput(unsigned int, InputImageType * image);
InputImageType *
GetInput();
InputImageType *
GetInput(unsigned int idx);
/** Make a DataObject of the correct type to be used as the specified
* output. */
using DataObjectPointerArraySizeType = ProcessObject::DataObjectPointerArraySizeType;
using Superclass::MakeOutput;
DataObjectPointer
MakeOutput(DataObjectPointerArraySizeType idx) override;
/** Get the output data of this process object. The output of this
* function is not valid until an appropriate Update() method has
* been called, either explicitly or implicitly. Both the filter
* itself and the data object have Update() methods, and both
* methods update the data.
*
* For Filters which have multiple outputs of different types, the
* GetOutput() method assumes the output is of OutputImageType. For
* the GetOutput(unsigned int) method, a dynamic_cast is performed
* incase the filter has outputs of different types or image
* types. Derived classes should have names get methods for these
* outputs.
*/
FEMObjectType *
GetOutput();
FEMObjectType *
GetOutput(unsigned int idx);
protected:
ImageToRectilinearFEMObjectFilter();
~ImageToRectilinearFEMObjectFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Method invoked by the pipeline in order to trigger mesh generation */
void
GenerateData() override;
/** Generate a rectangular mesh of quadrilateral elements. */
void
Generate2DRectilinearMesh();
/** Generate a rectangular mesh of hexahedron elements. */
void
Generate3DRectilinearMesh();
private:
vnl_vector<unsigned int> m_NumberOfElements{};
vnl_vector<unsigned int> m_PixelsPerElement{};
MaterialPointerType m_Material{};
ElementBasePointerType m_Element{};
};
} // end namespace fem
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkImageToRectilinearFEMObjectFilter.hxx"
#endif
#endif // itkImageToRectilinearFEMObjectFilter_h
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