itkQuadEdgeMeshCleanFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkQuadEdgeMeshCleanFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-09-30 22:08:42 $
  Version:   $Revision: 1.4 $

  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 __itkQuadEdgeMeshCleanFilter_h
#define __itkQuadEdgeMeshCleanFilter_h

#include "itkQuadEdgeMeshToQuadEdgeMeshFilter.h"
#include "itkBoundingBox.h"

#include "itkQuadEdgeMeshSquaredEdgeLengthDecimation.h"
#include "itkQuadEdgeMeshDecimationCriteria.h"

namespace itk
{
template< class TInput, class TOutput >
class QuadEdgeMeshCleanFilter :
  public QuadEdgeMeshToQuadEdgeMeshFilter< TInput, TOutput >
{
public:
  typedef QuadEdgeMeshCleanFilter                                 Self;
  typedef SmartPointer< Self >                                    Pointer;
  typedef SmartPointer< const Self >                              ConstPointer;
  typedef QuadEdgeMeshToQuadEdgeMeshFilter< TInput, TOutput >     Superclass;

  itkTypeMacro( QuadEdgeMeshCleanFilter, QuadEdgeMeshToQuadEdgeMeshFilter );

  itkNewMacro( Self );

  typedef TInput                                                InputMeshType;
  typedef typename Superclass::InputMeshPointer                 InputMeshPointer;
  typedef typename Superclass::InputCoordRepType                InputCoordRepType;
  typedef typename Superclass::InputPointType                   InputPointType;
  typedef typename Superclass::InputPointIdentifier             InputPointIdentifier;
  typedef typename Superclass::InputQEPrimal                    InputQEPrimal;
  typedef typename Superclass::InputVectorType                  InputVectorType;

  typedef typename Superclass::InputEdgeCellType                InputEdgeCellType; 
  typedef typename Superclass::InputPolygonCellType             InputPolygonCellType;
  typedef typename Superclass::InputPointIdList                 InputPointIdList;
  typedef typename Superclass::InputCellTraits                  InputCellTraits;
  typedef typename Superclass::InputPointsIdInternalIterator    InputPointsIdInternalIterator;
  typedef typename Superclass::InputQEIterator                  InputQEIterator;

  typedef typename InputMeshType::PointsContainer               InputPointsContainer;
  typedef typename InputMeshType::PointsContainerPointer        InputPointsContainerPointer;
  typedef typename InputMeshType::PointsContainerIterator       InputPointsContainerIterator;

  typedef typename InputMeshType::CellsContainerIterator        InputCellsContainerIterator;

  itkStaticConstMacro( PointDimension, unsigned int, InputMeshType::PointDimension );

  typedef TOutput                                               OutputMeshType;
  typedef typename Superclass::OutputMeshPointer                OutputMeshPointer;
  typedef typename Superclass::OutputCoordRepType               OutputCoordRepType;
  typedef typename Superclass::OutputPointType                  OutputPointType;
  typedef typename Superclass::OutputPointIdentifier            OutputPointIdentifier;
  typedef typename Superclass::OutputQEPrimal                   OutputQEPrimal;
  typedef typename Superclass::OutputVectorType                 OutputVectorType;

  typedef typename OutputMeshType::QEType                       OutputQEType;
  typedef typename OutputMeshType::PointsContainer              OutputPointsContainer;
  typedef typename OutputMeshType::PointsContainerPointer       OutputPointsContainerPointer;
  typedef typename OutputMeshType::PointsContainerIterator      OutputPointsContainerIterator;

  typedef typename OutputMeshType::CellsContainerIterator      OutputCellsContainerIterator;

  typedef BoundingBox< InputPointIdentifier, itkGetStaticConstMacro(PointDimension),
    InputCoordRepType, InputPointsContainer > BoundingBoxType;

  typedef typename BoundingBoxType::Pointer                 BoundingBoxPointer;

  typedef MaxMeasureBoundCriterion< OutputMeshType >        CriterionType;
  typedef typename CriterionType::Pointer                   CriterionPointer;

  typedef QuadEdgeMeshSquaredEdgeLengthDecimation< InputMeshType,
    InputMeshType, CriterionType >                          DecimationType;
  typedef typename DecimationType::Pointer                  DecimationPointer;

  itkSetMacro( AbsoluteTolerance, InputCoordRepType );
  itkSetMacro( RelativeTolerance, InputCoordRepType );

protected:
  QuadEdgeMeshCleanFilter()
    {
    this->m_AbsoluteTolerance2 = itk::NumericTraits< InputCoordRepType >::Zero;
    this->m_AbsoluteTolerance  = itk::NumericTraits< InputCoordRepType >::Zero;
    this->m_RelativeTolerance  = itk::NumericTraits< InputCoordRepType >::Zero;
    }

  virtual ~QuadEdgeMeshCleanFilter() {}

  InputCoordRepType m_AbsoluteTolerance2;
  InputCoordRepType m_AbsoluteTolerance;
  InputCoordRepType m_RelativeTolerance;

  void GenerateData()
    {
    InputCoordRepType zeroValue = itk::NumericTraits< InputCoordRepType >::Zero;

    if( ( m_AbsoluteTolerance == zeroValue ) && ( m_RelativeTolerance != zeroValue ) )
      {
      assert( ( m_RelativeTolerance > zeroValue ) && ( m_RelativeTolerance < 1. ) );
      BoundingBoxPointer bounding_box = BoundingBoxType::New();
      bounding_box->SetPoints( this->GetInput()->GetPoints() );
      bounding_box->ComputeBoundingBox();

      m_AbsoluteTolerance2 = m_RelativeTolerance * m_RelativeTolerance *
        bounding_box->GetDiagonalLength2();
      }

    if( m_AbsoluteTolerance != zeroValue )
      {
      m_AbsoluteTolerance2 = m_AbsoluteTolerance * m_AbsoluteTolerance;
      }

    this->MergePoints();
    this->CleanPoints();
    }

  void MergePoints()
    {
    OutputMeshPointer output = this->GetOutput();

    CriterionPointer criterion = CriterionType::New();
    criterion->SetTopologicalChange( false );
    criterion->SetMeasureBound( m_AbsoluteTolerance2 );

    DecimationPointer decimate = DecimationType::New();
    decimate->SetInput( this->GetInput() );
    decimate->SetCriterion( criterion );
    decimate->Update();

    InputMeshPointer temp = decimate->GetOutput();

    InputPointsContainerIterator p_it = temp->GetPoints()->Begin();
    InputPointsContainerIterator p_end = temp->GetPoints()->End();

    OutputPointType pOut;

    while( p_it != p_end )
      {
      pOut.CastFrom( p_it.Value() );
      output->SetPoint( p_it.Index(), pOut );
      ++p_it;
      }

    // Copy cells
    InputCellsContainerIterator c_it = temp->GetCells()->Begin();
    InputCellsContainerIterator c_end = temp->GetCells()->End();
    InputEdgeCellType* qe;
    InputPolygonCellType* pe;
    InputQEPrimal* QEGeom;

    while( c_it != c_end )
      {
      if( ( qe = dynamic_cast< InputEdgeCellType* >( c_it.Value() ) ) )
        {
        QEGeom = qe->GetQEGeom( );
        output->AddEdgeWithSecurePointList( QEGeom->GetOrigin(),
          QEGeom->GetDestination() );
        }
      else
        {
        pe = dynamic_cast< InputPolygonCellType* >( c_it.Value());
        if( pe )
          {
          InputPointIdList points;

          for( InputPointsIdInternalIterator pit = pe->InternalPointIdsBegin();
               pit != pe->InternalPointIdsEnd( ); ++pit )
            {
            points.push_back( ( *pit ) );
            }
          output->AddFaceWithSecurePointList( points );
          } 
        }
      ++c_it;
      }
    }

  void CleanPoints()
    {
    OutputMeshPointer output = this->GetOutput();

    OutputPointsContainerIterator p_it = output->GetPoints()->Begin();
    OutputPointsContainerIterator p_end = output->GetPoints()->End();
    OutputPointIdentifier id( 0 );

    while( p_it != p_end )
      {
      id = p_it->Index();
      if( output->FindEdge( id ) == 0 )
        {
        output->DeletePoint( id );
        }
      ++p_it;
      }

    output->SqueezePointsIds( );
    }

private:
  QuadEdgeMeshCleanFilter( const Self& );
  void operator = ( const Self& );
};
}
#endif

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