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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    itkQuadEdgeMeshEulerOperatorSplitVertexFunction.txx
  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 __itkQuadEdgeMeshEulerOperatorSplitVertexFunction_txx
#define __itkQuadEdgeMeshEulerOperatorSplitVertexFunction_txx

#include "itkQuadEdgeMeshEulerOperatorSplitVertexFunction.h"

namespace itk
{

template < class TMesh, class TQEType >
  typename QuadEdgeMeshEulerOperatorSplitVertexFunction< TMesh, TQEType >::OutputType
  QuadEdgeMeshEulerOperatorSplitVertexFunction< TMesh, TQEType >::
  Evaluate( QEType* h, QEType* g )
{
  if( !this->m_Mesh )
    {
    itkDebugMacro( "No mesh present." );
    return( (QEType*) 0 );
    }

  if ( ( h == (QEType*)(0) ) || ( g == (QEType*)(0) ) )
    {
    itkDebugMacro( "One or more argument(s) is(are) null." );
    return( (QEType*) 0 );
    }

  if ( h == g )
    {
    itkDebugMacro( "The two half-edges are the same. No antenna allowed." );
    return( (QEType*) 0 );
    }

  if( h->GetDestination( ) != g->GetDestination( ) )
    {
    itkDebugMacro( "The two half-edges must be incident to the same vertex." );
    return( (QEType*) 0 );
    }

  // delete the faces
  this->m_Mesh->DeleteFace( h->GetRight( ) );
  this->m_Mesh->DeleteFace( g->GetRight( ) );

  // splice to create a new point and disconnect the rings
  this->m_NewPoint = this->m_Mesh->Splice( h->GetSym( ), g->GetSym( ) );

  // then add a new edge
  QEType* ReturnedEdge = this->m_Mesh->AddEdge( g->GetDestination( ),
                                                h->GetDestination( ) );

  // Build two new faces
  this->m_Mesh->AddFace( h->GetSym( ) );
  this->m_Mesh->AddFace( g->GetSym( ) );
  this->m_Mesh->Modified( );

  return( ReturnedEdge );

}

} // namespace itk

#endif

// eof - itkQuadEdgeMeshEulerOperatorSplitVertexFunction.txx