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NearestNeighbour.hpp

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 * This file is part of openWNS (open Wireless Network Simulator)
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 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#ifndef _NEARESTNEIGHBOUR_HPP
#define _NEARESTNEIGHBOUR_HPP

#include <cmath>
#include <WNS/Interpolation.hpp>

namespace wns
{
    template<typename T,
         InterpolationDefs::SizeType N>
    class NearestNeighbour :
        public Interpolation<T, N>
    {
        typedef Interpolation<T, N> SuperType;
    public:
        typedef typename SuperType::SizeType SizeType;

        typedef typename SuperType::CoordType CoordType;

        typedef typename SuperType::DiscreteContainer DiscreteContainer;

        typedef NearestNeighbour<T, N-1> HyperplaneType;

        typedef const HyperplaneType& ConstReference;

        NearestNeighbour(const DiscreteContainer& discreteValues)
            : SuperType(discreteValues),
              hyperplanes(discreteValues.dimSize(0), HyperplaneType(discreteValues[0]))
        {
            for(SizeType i = 0; i < hyperplanes.size(); ++i) {
                hyperplanes[i] = HyperplaneType(discreteValues[i]);
            }
        }

        virtual ConstReference operator[](const CoordType& coord) const
        {
            typedef typename DiscreteContainer::IndexType IndexType;
            return hyperplanes[(IndexType)std::floor(coord+0.5)];
        }

    private:
        typedef std::vector<HyperplaneType> HyperplaneContainer;

        HyperplaneContainer hyperplanes;
    };

    template<typename T>
    class NearestNeighbour<T, 1> :
        public Interpolation<T, 1>
    {
        typedef Interpolation<T, 1> SuperType;
    public:
        typedef typename SuperType::ValueType ValueType;
        typedef typename SuperType::CoordType CoordType;
        typedef typename SuperType::DiscreteContainer DiscreteContainer;
        typedef typename DiscreteContainer::IndexType IndexType;

        NearestNeighbour(const DiscreteContainer& discreteValues)
            : SuperType(discreteValues)
        {}

        virtual ValueType operator[](const CoordType& coord) const
        {
            return Interpolation<T,1>::discretes()[(IndexType)std::floor(coord+0.5)];
        }

    };
}

#endif // _NEARESTNEIGHBOUR_HPP

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