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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkFEMLoadGrav.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkFEMLoadGrav_h
#define __itkFEMLoadGrav_h
#include "itkFEMLoadElementBase.h"
#include "vnl/vnl_vector.h"
namespace itk {
namespace fem {
/**
* \class LoadGrav
* \brief Abstract gravity load class.
*
* This load is integrated over a whole element. The load vector is returned in a
* Fg member function defined in a derived class. The Fg function accepts a vector
* specifying a point in global coordinate system and returns a load vector
* defined at the point. Derived LoadClasses must define this function.
*/
class LoadGrav : public LoadElement
{
FEM_ABSTRACT_CLASS(LoadGrav,LoadElement)
public:
virtual vnl_vector<Float> Fg(vnl_vector<Float>) = 0;
};
/**
* \class LoadGravConst
* \brief Constant gravity load class.
*
* This is a special case of LoadGrav. The load vector is the same on
* every point in space.
*/
class LoadGravConst : public LoadGrav
{
FEM_CLASS(LoadGravConst,LoadGrav)
public:
vnl_vector<Float> Fg_value;
virtual vnl_vector<Float> Fg(vnl_vector<Float>)
{
return Fg_value;
}
/**
* Read an object from input stream.
*/
virtual void Read( std::istream& f, void* info );
/**
* Write an object to the output stream
*/
virtual void Write( std::ostream& f ) const;
};
FEM_CLASS_INIT(LoadGravConst)
}} // end namespace itk::fem
#endif // #ifndef __itkFEMLoadGrav_h
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