Expander.ih

#include <cstdlib>

// IMPLEMENTATION of inline methods.

// ----------------------- Standard services ------------------------------

template <typename TObject>
inline
DGtal::Expander<TObject>::~Expander()
{
}

template <typename TObject>
inline
DGtal::Expander<TObject>
::Expander( const Object & object, const Point & p )
  : myEmbeddingDomain( object.pointSet().domain() ),
    myObject( object ),
    myObjectDomain( object.pointSet() ),
    myObjectAdjacency( myObjectDomain, object.adjacency() ),
    myCore( myEmbeddingDomain ), 
    myLayer( myEmbeddingDomain ),
    myDistance( 0 ), myFinished( false ),
    myInCorePred( myCore ), 
    myNotInCorePred( myInCorePred )
{
  ASSERT( myObjectDomain.isInside( p ) );
  myCore.insertNew( p );
  computeNextLayer( myCore );
}

template <typename TObject>
template <typename PointInputIterator>
inline
DGtal::Expander<TObject>
::Expander( const Object & object,
      PointInputIterator b, PointInputIterator e )
  : myEmbeddingDomain( object.pointSet().domain() ),
    myObject( object ),
    myObjectDomain( object.pointSet() ),
    myObjectAdjacency( myObjectDomain, object.adjacency() ),
    myCore( myEmbeddingDomain ), 
    myLayer( myEmbeddingDomain ),
    myDistance( 0 ), myFinished( false ),
    myInCorePred( myCore ),
    myNotInCorePred( myInCorePred )
{
  myCore.insertNew( b, e );  
  computeNextLayer( myCore );
}


template <typename TObject>
inline
bool
DGtal::Expander<TObject>::finished() const
{
  return myFinished;
}

template <typename TObject>
inline
typename DGtal::Expander<TObject>::Size 
DGtal::Expander<TObject>::distance() const
{
  return myDistance;
}


template <typename TObject>
inline
bool
DGtal::Expander<TObject>
::nextLayer()
{
  endLayer();
  computeNextLayer( myLayer );
  return ! finished();
}

template <typename TObject>
inline
void
DGtal::Expander<TObject>
::endLayer()
{
  myCore.insertNew( myLayer.begin(), myLayer.end() );
}

template <typename TObject>
inline
void
DGtal::Expander<TObject>
::computeNextLayer( const DigitalSet & src )
{
  if ( finished() ) return;

  ConstIterator p = src.begin();
  ConstIterator pEnd = src.end();
  typedef std::set<Point> SetContainer;
  typedef std::insert_iterator< SetContainer > Inserter;
  typedef std::vector<Point> VectorContainer;
  typedef std::back_insert_iterator< VectorContainer > VectorInserter;
  SetContainer newLayer;
  Inserter inserter( newLayer, newLayer.begin() );
  
  // const ObjectDomainPredicate & objectPred = myObjectDomain.predicate();
  typedef typename ObjectDomain::Predicate ObjectDomainPredicate; 
  typedef BinaryPointPredicate< ObjectDomainPredicate, 
    NotInCoreDomainPredicate > Predicate;

  Predicate cPred( myObjectDomain.predicate(), 
                           myNotInCorePred,
                           andBF2 );
  // Computes the 1-neighborhood of the core.
  for ( ; p != pEnd; ++p )
    {
      myObjectAdjacency.writeNeighbors
        ( inserter, *p, cPred );
      // std::cerr << *p;
      // for ( unsigned int i = 0; i < v.size(); ++i )
      //   {
      //     std::cerr << " " << v[ i ];
      //     newLayer.insert( v[ i ] );
      //   }
      // std::cerr << std::endl;
      // v.clear();
    }
  // std::cerr << "Core.size=" << myCore.size() 
  //       << " prevLayer.size=" << src.size()
  //       << " nextLayer.size=" << newLayer.size()
  //       << std::endl;
  // Termination test.
  if ( newLayer.empty() )
    myFinished = true;
  else
    {
      myDistance++;
      myLayer.clear();
      myLayer.insertNew( newLayer.begin(), newLayer.end() );
    }
}


template <typename TObject>
inline
const typename DGtal::Expander<TObject>::DigitalSet &
DGtal::Expander<TObject>
::core() const
{
  return myCore;
}

template <typename TObject>
inline
const typename DGtal::Expander<TObject>::DigitalSet &
DGtal::Expander<TObject>
::layer() const
{
  return myLayer;
}

template <typename TObject>
inline
typename DGtal::Expander<TObject>::ConstIterator
DGtal::Expander<TObject>
::begin() const
{
  return myLayer.begin();
}

template <typename TObject>
inline
typename DGtal::Expander<TObject>::ConstIterator
DGtal::Expander<TObject>
::end() const
{
  return myLayer.end();
}


// Interface - public :

template <typename TObject>
inline
void
DGtal::Expander<TObject>::selfDisplay ( std::ostream & out ) const
{
  out << "[Expander layer=" << myDistance 
      << " layer.size=" << myLayer.size()
      << " finished=" << myFinished
      << " ]";
}

template <typename TObject>
inline
bool
DGtal::Expander<TObject>::isValid() const
{
    return true;
}



// Implementation of inline functions                                        //

template <typename TObject>
inline
std::ostream&
DGtal::operator<< ( std::ostream & out, 
      const Expander<TObject> & object )
{
  object.selfDisplay( out );
  return out;
}

//                                                                           //