KNearest.hpp

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/*
 *  Copyright (C) 2012 Josh Bialkowski (jbialk@mit.edu)
 *
 *  This file is part of mpblocks.
 *
 *  mpblocks is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  mpblocks 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 mpblocks.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef MPBLOCKS_KD_TREE_R2_S1_KNEAREST_HPP_
#define MPBLOCKS_KD_TREE_R2_S1_KNEAREST_HPP_


namespace  mpblocks {
namespace   kd_tree {
namespace r2_s1 {


template <class Traits,template<class> class Allocator>
KNearest<Traits,Allocator>::KNearest(unsigned int k)
{
    m_k = k;
}


template <class Traits,template<class> class Allocator>
void KNearest<Traits,Allocator>::reset(  )
{
    m_queue.clear();
}


template <class Traits,template<class> class Allocator>
void KNearest<Traits,Allocator>::reset( int k )
{
    m_queue.clear();
    m_k = k;
}



template <class Traits,template<class> class Allocator>
const typename KNearest<Traits,Allocator>::PQueue_t&
    KNearest<Traits,Allocator>::result()
{
    return m_queue;
}




template <class Traits,template<class> class Allocator>
void KNearest<Traits,Allocator>::evaluate(
        const Point_t& q, const Point_t& p, Node_t* n)
{
    Key_t    key;
    key.d2 = m_dist2Fn(q,p);
    key.n  = n;

    m_queue.insert(key);

    if( m_queue.size() > m_k )
        m_queue.erase( --m_queue.end() );
}




template <class Traits,template<class> class Allocator>
bool KNearest<Traits,Allocator>::shouldRecurse(
        const Point_t& q, const HyperRect_t& r )
{
    Format_t d2  = m_dist2Fn(q,r);
    return ( m_queue.size() < m_k || d2 < m_queue.rbegin()->d2 );
}






} // namespace r2_s1
} // namespace kd_tree
} // namespace mpblocks








#endif // NEARESTNEIGHBOR_H_