itkTriangleCell.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkTriangleCell.h,v $
  Language:  C++
  Date:      $Date: 2008-07-19 14:52:53 $
  Version:   $Revision: 1.61 $

  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 __itkTriangleCell_h
#define __itkTriangleCell_h

#include "itkCellInterface.h"
#include "itkLineCell.h"
#include "itkTriangleCellTopology.h"

#include <vector>

namespace itk
{

template < typename TCellInterface >
class ITK_EXPORT TriangleCell:
  public TCellInterface, private TriangleCellTopology
{
public:
  itkCellCommonTypedefs(TriangleCell);
  itkCellInheritedTypedefs(TCellInterface);

  itkTypeMacro(TriangleCell, CellInterface);

  typedef VertexCell< TCellInterface >            VertexType;
  typedef typename VertexType::SelfAutoPointer    VertexAutoPointer;

  typedef LineCell< TCellInterface >              EdgeType;
  typedef typename EdgeType::SelfAutoPointer      EdgeAutoPointer;

  itkStaticConstMacro(NumberOfPoints, unsigned int, 3);
  itkStaticConstMacro(NumberOfVertices, unsigned int, 3);
  itkStaticConstMacro(NumberOfEdges, unsigned int, 3);
  itkStaticConstMacro(CellDimension, unsigned int, 2);

  virtual CellGeometry GetType(void) const 
    {return Superclass::TRIANGLE_CELL;}
  virtual void MakeCopy( CellAutoPointer & ) const;
  virtual unsigned int GetDimension(void) const;
  virtual unsigned int GetNumberOfPoints(void) const;
  virtual CellFeatureCount GetNumberOfBoundaryFeatures(int dimension) const;
  virtual bool GetBoundaryFeature(int dimension, CellFeatureIdentifier,
    CellAutoPointer &);
  virtual void SetPointIds(PointIdConstIterator first);
  virtual void SetPointIds(PointIdConstIterator first,
                           PointIdConstIterator last);
  virtual void SetPointId(int localId, PointIdentifier);
  virtual PointIdIterator      PointIdsBegin(void);
  virtual PointIdConstIterator PointIdsBegin(void) const;
  virtual PointIdIterator      PointIdsEnd(void);
  virtual PointIdConstIterator PointIdsEnd(void) const; 

  virtual CellFeatureCount GetNumberOfVertices(void) const;
  virtual CellFeatureCount GetNumberOfEdges(void) const;
  virtual bool GetVertex(CellFeatureIdentifier, VertexAutoPointer &);
  virtual bool GetEdge(CellFeatureIdentifier, EdgeAutoPointer &);

  virtual bool EvaluatePosition(CoordRepType*,
                                PointsContainer* ,
                                CoordRepType*,
                                CoordRepType [],
                                double *,
                                InterpolationWeightType*);

  itkCellVisitMacro(Superclass::TRIANGLE_CELL);


  CoordRepType ComputeArea( PointsContainer* );
  PointType ComputeBarycenter( CoordRepType*,
                               PointsContainer* );

  PointType ComputeCenterOfGravity( PointsContainer* );
  PointType ComputeCircumCenter( PointsContainer* );

 public:
  TriangleCell() :
    m_PointIds( NumberOfPoints, NumericTraits<PointIdentifier>::max() )
    {}
  ~TriangleCell() {}

 protected:
  std::vector< PointIdentifier > m_PointIds;

 private:
  TriangleCell(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  double DistanceToLine(PointType x, PointType p1, PointType p2, 
                              double &t, CoordRepType *closestPoint);
  double DistanceToLine(PointType x, PointType p1, PointType p2, 
                              double &t, PointType &closestPoint);

};


} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkTriangleCell.txx"
#endif

#endif

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