FPLengthEstimator.ih

/**
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 **/
 
/**
 * @file FPLengthEstimator.ih
 * @author Tristan Roussillon (\c
 * tristan.roussillon@liris.cnrs.fr ) Laboratoire d'InfoRmatique en
 * Image et Systèmes d'information - LIRIS (CNRS, UMR 5205), CNRS,
 * France
 *
 *
 * @date 2011/07/07
 *
 * Implementation of inline methods defined in FPLengthEstimator.h
 *
 * This file is part of the DGtal library.
 */
 
 
//////////////////////////////////////////////////////////////////////////////
#include <cstdlib>
//////////////////////////////////////////////////////////////////////////////
 
///////////////////////////////////////////////////////////////////////////////
// IMPLEMENTATION of inline methods.
///////////////////////////////////////////////////////////////////////////////
 
///////////////////////////////////////////////////////////////////////////////
// Interface - public :
 
template <typename T>
inline
typename DGtal::FPLengthEstimator<T>::Quantity
DGtal::FPLengthEstimator<T>::eval(const ConstIterator& itb,
    const ConstIterator& ite, const double h) const
{
  ASSERT(h > 0.);
 
  Quantity val = 0.;
  if ( isEmpty(itb,ite) )
    return val;
 
  FaithfulPolygon fp( itb, ite ); 
  std::vector<Point> points(fp.size());
  fp.copyFP( points.begin() );
 
  typename std::vector<Point>::const_iterator i = points.begin();
  typename std::vector<Point>::const_iterator j = i;
  ++j; 
  const typename std::vector<Point>::const_iterator end = points.end();
 
  for ( ; j != end; ++i, ++j )
  {
    Vector v( *j - *i ); 
    val += v.norm(Vector::L_2);
  }
  if ( IsCirculator<ConstIterator>::value )
  {
    Vector v( points.front() - *i ); 
    val += v.norm(Vector::L_2);
  }
  
  return val*h;
}
 
 
 
 
 
 
// ------------------------------------------------------------------------
template <typename T>
inline
void
DGtal::FPLengthEstimator<T>::selfDisplay ( std::ostream & out ) const
{
  out << "[FPLengthEstimator]";
  if (isValid()) 
    out <<" initialized";
  else
    out<< " not initialized";
}
 
// ------------------------------------------------------------------------
template <typename T>
inline
bool
DGtal::FPLengthEstimator<T>::isValid() const
{
    return true;
}
 
 
 
///////////////////////////////////////////////////////////////////////////////
// Implementation of inline functions                                        //
 
template <typename T>
inline
std::ostream&
DGtal::operator<< ( std::ostream & out, 
      const FPLengthEstimator<T> & object )
{
  object.selfDisplay( out );
  return out;
}
 
//                                                                           //
///////////////////////////////////////////////////////////////////////////////