itkQuadEdgeMeshBaseIterator.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkQuadEdgeMeshBaseIterator.h,v $
  Language:  C++
  Date:      $Date: 2007-12-23 17:55:34 $
  Version:   $Revision: 1.6 $

  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.

=========================================================================*/
// -------------------------------------------------------------------------
// This code is an implementation of the well known quad edge (QE) data
// structure in the ITK library. Although the original QE can handle non
// orientable 2-manifolds and its dual and its mirror, this implementation
// is specifically dedicated to handle orientable 2-manifolds along with
// their dual.
//
// Any comment, criticism and/or donation is welcome.
//
// Please contact any member of the team:
//
// - The frog master (Eric Boix)       eboix@ens-lyon.fr
// - The duck master (Alex Gouaillard) alexandre.gouaillard@sun.com
// - The cow  master (Leonardo Florez) florez@creatis.insa-lyon.fr
// -------------------------------------------------------------------------

#ifndef __itkQuadEdgeMeshBaseIterator_h
#define __itkQuadEdgeMeshBaseIterator_h

// -------------------------------------------------------------------------
#define itkQEDefineIteratorMethodsMacro( Op )                             \
  virtual Iterator Begin##Op()                                            \
    {                                                                     \
    return Iterator( this, Self::Iterator::Operator##Op, true );          \
    }                                                                     \
                                                                          \
  virtual ConstIterator Begin##Op() const                                 \
    {                                                                     \
    return ConstIterator( this, Self::ConstIterator::Operator##Op,        \
    true );                                                               \
    }                                                                     \
                                                                          \
  virtual Iterator End##Op()                                              \
    {                                                                     \
    return Iterator( this, Self::Iterator::Operator##Op, false );         \
    }                                                                     \
                                                                          \
  virtual ConstIterator End##Op() const                                   \
    {                                                                     \
    return ConstIterator( this, Self::ConstIterator::Operator##Op,        \
    false );                                                              \
    }

// -------------------------------------------------------------------------
#define itkQEDefineIteratorGeomMethodsMacro( Op )                         \
  virtual IteratorGeom BeginGeom##Op()                                    \
    {                                                                     \
    return IteratorGeom( this, Self::IteratorGeom::Operator##Op,          \
    true );                                                               \
    }                                                                     \
                                                                          \
  virtual ConstIteratorGeom BeginGeom##Op() const                         \
    {                                                                     \
    return ConstIteratorGeom( this,                                       \
    Self::ConstIteratorGeom::Operator##Op, true );                        \
    }                                                                     \
                                                                          \
  virtual IteratorGeom EndGeom##Op()                                      \
    {                                                                     \
    return IteratorGeom( this, Self::IteratorGeom::Operator##Op,          \
    false );                                                              \
    }                                                                     \
                                                                          \
  virtual ConstIteratorGeom EndGeom##Op() const                           \
    {                                                                     \
    return ConstIteratorGeom( this,                                       \
    Self::ConstIteratorGeom::Operator##Op, false );                       \
    }


namespace itk
{
template< typename TQuadEdge >
class QuadEdgeMeshBaseIterator
{
public:
  // Hierarchy typedefs & values.
  typedef QuadEdgeMeshBaseIterator Self;
  typedef TQuadEdge                QuadEdgeType;

  // Different types of iterators, one for each basic QE operation.
  enum
    {
    OperatorOnext    =  0,
    OperatorSym      =  1,
    OperatorLnext    =  2,
    OperatorRnext    =  3,
    OperatorDnext    =  4,
    OperatorOprev    =  5,
    OperatorLprev    =  6,
    OperatorRprev    =  7,
    OperatorDprev    =  8,
    OperatorInvOnext =  9,
    OperatorInvLnext = 10,
    OperatorInvRnext = 11,
    OperatorInvDnext = 12
    };
  
public:
// Object creation methods.
  QuadEdgeMeshBaseIterator( QuadEdgeType* e,
                            int op = OperatorOnext,
                            bool start = true )
    : m_StartEdge( e ), m_Iterator( e ),
      m_OpType( op ), m_Start( start ) {}
  
  virtual ~QuadEdgeMeshBaseIterator() {}
  
  Self& operator=( const Self& r )
    {
    m_StartEdge = r.m_StartEdge;
    m_Iterator = r.m_Iterator;
    m_OpType = r.m_OpType;
    m_Start = r.m_Start;
    return( *this );
    }

  QuadEdgeType* GetStartEdge() const { return( m_StartEdge ); }
  QuadEdgeType* GetIterator() const  { return( m_Iterator ); }
  int           GetOpType() const    { return( m_OpType ); }
  bool          GetStart() const     { return( m_Start ); }

  bool operator==( Self & r )
    {
    return( ( m_StartEdge == r.m_StartEdge ) &&
      ( m_Iterator  == r.m_Iterator )  &&
      ( m_OpType    == r.m_OpType )  &&
      ( m_Start     == r.m_Start ) );
    }

  bool operator==( const Self & r ) const
    {
    return( ( m_StartEdge == r.m_StartEdge ) &&
      ( m_Iterator  == r.m_Iterator )  &&
      ( m_OpType    == r.m_OpType )  &&
      ( m_Start     == r.m_Start ) );
    }

  bool operator!=( Self & r )
    { 
    return( !( this->operator==( r ) ) );
    }
  
  bool operator!=( const Self & r ) const
    {
    return( !( this->operator==( r ) ) );
    }
  
  Self & operator++()
    {
    if( m_Start )
      {
      this->GoToNext();
      m_Start = !( m_Iterator == m_StartEdge );
      }

    return( *this );
    }
  
  Self & operator++( int )
    {
    if( m_Start )
      {
      this->GoToNext();
      m_Start = !( m_Iterator == m_StartEdge );
      }  
    return( *this );
    }
  
protected:
  virtual void GoToNext()
    {
    switch( m_OpType )
      {
      case OperatorOnext    : m_Iterator = m_Iterator->GetOnext();
        break;
      case OperatorSym      : m_Iterator = m_Iterator->GetSym();
        break;
      case OperatorLnext    : m_Iterator = m_Iterator->GetLnext();
        break;
      case OperatorRnext    : m_Iterator = m_Iterator->GetRnext();
        break;
      case OperatorDnext    : m_Iterator = m_Iterator->GetDnext();
        break;
      case OperatorOprev    : m_Iterator = m_Iterator->GetOprev();
        break;
      case OperatorLprev    : m_Iterator = m_Iterator->GetLprev();
        break;
      case OperatorRprev    : m_Iterator = m_Iterator->GetRprev();
        break;
      case OperatorDprev    : m_Iterator = m_Iterator->GetDprev();
        break;
      case OperatorInvOnext : m_Iterator = m_Iterator->GetInvOnext();
        break;
      case OperatorInvLnext : m_Iterator = m_Iterator->GetInvLnext();
        break;
      case OperatorInvRnext : m_Iterator = m_Iterator->GetInvRnext();
        break;
      case OperatorInvDnext : m_Iterator = m_Iterator->GetInvDnext();
        break;
      default: break;
      }
    }

protected:
  QuadEdgeType * m_StartEdge; 
  QuadEdgeType * m_Iterator;  
  int            m_OpType;    
  bool           m_Start;     
};

template< typename TQuadEdge >
class QuadEdgeMeshIterator
: public QuadEdgeMeshBaseIterator< TQuadEdge >
{
public:

  typedef QuadEdgeMeshIterator                  Self;
  typedef QuadEdgeMeshBaseIterator< TQuadEdge > Superclass;
  typedef TQuadEdge                             QuadEdgeType;

public:
  QuadEdgeMeshIterator( QuadEdgeType* e = (QuadEdgeType*)0,
            int op = Superclass::OperatorOnext,
            bool start = true )
      : Superclass( e, op, start ) {}

  virtual ~QuadEdgeMeshIterator() {}

  QuadEdgeType * Value() { return( this->m_Iterator ); }
  const QuadEdgeType * Value() const { return( this->m_Iterator ); }
};

template< typename TGeometricalQuadEdge >
class QuadEdgeMeshIteratorGeom
  : public QuadEdgeMeshIterator< TGeometricalQuadEdge >
{
public:

  typedef QuadEdgeMeshIterator< TGeometricalQuadEdge > Superclass;
  typedef TGeometricalQuadEdge                         QuadEdgeType;

  typedef typename QuadEdgeType::OriginRefType OriginRefType;

public:
  QuadEdgeMeshIteratorGeom( QuadEdgeType* e = (QuadEdgeType*)0,
                            int op = Superclass::OperatorOnext,
                            bool start = true )
    : Superclass( e, op, start ) {}
  OriginRefType operator*() { return( this->m_Iterator->GetOrigin( ) ); }
};

template< typename TQuadEdge >
class QuadEdgeMeshConstIterator
  : public QuadEdgeMeshBaseIterator< TQuadEdge >
{
public:

  typedef QuadEdgeMeshConstIterator             Self;
  typedef QuadEdgeMeshBaseIterator< TQuadEdge > Superclass;
  typedef QuadEdgeMeshIterator< TQuadEdge >     NoConstType;
  typedef TQuadEdge                             QuadEdgeType;

public:
  QuadEdgeMeshConstIterator( const QuadEdgeType* e = (QuadEdgeType*)0,
                             int op = Superclass::OperatorOnext,
                             bool start = true )
    : Superclass( const_cast<QuadEdgeType*>(e), op, start ) {}

  virtual ~QuadEdgeMeshConstIterator() {}

  Self& operator=( const NoConstType& r )
    {
    this->m_StartEdge = r.GetStartEdge();
    this->m_Iterator = r.GetIterator();
    this->m_OpType = r.GetOpType();
    this->m_Start = r.GetStart();
    return( *this );
    }

  const QuadEdgeType* Value() const { return( this->m_Iterator ); }
};

template< typename TGeometricalQuadEdge >
class QuadEdgeMeshConstIteratorGeom
  : public QuadEdgeMeshConstIterator< TGeometricalQuadEdge >
{
public:

  typedef QuadEdgeMeshConstIteratorGeom                     Self;
  typedef QuadEdgeMeshConstIterator< TGeometricalQuadEdge > Superclass;
  typedef QuadEdgeMeshIteratorGeom< TGeometricalQuadEdge >  NoConstType;
  typedef TGeometricalQuadEdge                              QuadEdgeType;

  typedef typename QuadEdgeType::OriginRefType OriginRefType;

public:
  QuadEdgeMeshConstIteratorGeom( const QuadEdgeType* e = (QuadEdgeType*)0,
                                 int op = Superclass::OperatorOnext,
                                 bool start = true )
    : Superclass( e, op, start ) {}
  
  virtual ~QuadEdgeMeshConstIteratorGeom() {}
  
  Self& operator=( const NoConstType& r )
    {
    this->m_StartEdge = r.GetStartEdge();
    this->m_Iterator = r.GetIterator();
    this->m_OpType = r.GetOpType();
    this->m_Start = r.GetStart();
    return( *this );
    }
  
  const OriginRefType operator*() const
    {
    return( this->m_Iterator->GetOrigin() );
    }
};

} 

#endif 

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