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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 itkFEMLoadEdge_h
#define itkFEMLoadEdge_h
#include "itkFEMLoadElementBase.h"
#include "ITKFEMExport.h"
#include "vnl/vnl_matrix.h"
namespace itk
{
namespace fem
{
/**
* \class LoadEdge
* \brief A generic load that can be applied to an edge of the element.
*
* Can also be used to apply natural (Neumann) boundary condition on the
* edge of the element. In this case m_Edge defines the edge or surface
* of the element on which the BC exists and matrix m_Force holds the actual
* prescribed values of the BC.
* \ingroup ITKFEM
*/
class ITKFEM_EXPORT LoadEdge : public LoadElement
{
public:
/** Standard class type aliases. */
using Self = LoadEdge;
using Superclass = LoadElement;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** New macro for creation of through the object factory. */
itkSimpleNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(LoadEdge);
/** CreateAnother method will clone the existing instance of this type,
* including its internal member variables. */
itk::LightObject::Pointer
CreateAnother() const override;
/**
* Set the edge number on which the force is being applied
*/
void
SetEdge(int edge);
/**
* Get the edge number on which the force is being applied
*/
int
GetEdge() const;
/**
* Set the edge force values
*/
void
SetForce(const vnl_matrix<itk::fem::Element::Float> force);
/**
* Get the edge force values
*/
const vnl_matrix<itk::fem::Element::Float> &
GetForce() const;
vnl_matrix<itk::fem::Element::Float> &
GetForce();
/** Apply the load to the specified element */
void
ApplyLoad(Element::ConstPointer element, Element::VectorType & Fe) override;
protected:
void
PrintSelf(std::ostream & os, Indent indent) const override;
/**
* Local number of the edge (face) of the element on which the load acts.
* Check the corresponding element class for more info on edge numbering.
*/
int m_Edge{};
/**
* An edge force matrix. This matrix specifies nodal forces on all
* nodes within the edge or face on which the load acts. Each nodal
* force is decomposed into several components (check the documentation
* inside the element class). In case of 2D elements this components
* are normal (1st component) and tangential (2nd component) force
* acting on the edge of the element. A positive normal load acts in
* a direction INTO the element. A positive tangential load acts in
* an ANTICLOCKWISE direction with respect to the loaded element.
* Each nodal force is stored in a column of the matrix. The number
* of columns in the Force matrix must correspond to the number of
* nodes that define the edge (face...). The force is interpolated
* over the entire edge (face) by using the shape functions of the
* element. Again check the documentation of the element class to which
* the force is applied.
*/
vnl_matrix<Float> m_Force{};
};
} // end namespace fem
} // end namespace itk
#endif // itkFEMLoadEdge_h
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