itkFEMLoadGrav.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkFEMLoadGrav.h,v $
  Language:  C++
  Date:      $Date: 2009-01-30 21:10:18 $
  Version:   $Revision: 1.10 $

  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 : public LoadElement
{
  FEM_ABSTRACT_CLASS(LoadGrav,LoadElement)
public:

  virtual vnl_vector<Float> Fg(vnl_vector<Float>) = 0;

};

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;
    }

  virtual void Read( std::istream& f, void* info );

  virtual void Write( std::ostream& f ) const;

};

FEM_CLASS_INIT(LoadGravConst)

}} // end namespace itk::fem

#endif // #ifndef __itkFEMLoadGrav_h