sampler_nn.h

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/*****************************************************************************
* Multiscale Universal Interface Code Coupling Library                       *
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* Copyright (C) 2019 Y. H. Tang, S. Kudo, X. Bian, Z. Li, G. E. Karniadakis  *
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#ifndef MUI_SAMPLER_NN_H_
#define MUI_SAMPLER_NN_H_
 
#include "../../config.h"
#include "../sampler.h"
 
namespace mui {
 
template<typename CONFIG=default_config, typename O_TP=typename CONFIG::REAL, typename I_TP=O_TP>
class sampler_nearest_neighbor {
public:
    using OTYPE      = O_TP;
    using ITYPE      = I_TP;
    using REAL       = typename CONFIG::REAL;
    using INT        = typename CONFIG::INT;
    using point_type = typename CONFIG::point_type;
 
    sampler_nearest_neighbor() {}
 
    template<template<typename,typename> class CONTAINER>
    inline OTYPE filter( point_type focus, const CONTAINER<ITYPE,CONFIG> &data_points ) const {
        REAL r2min = std::numeric_limits<REAL>::max();
        OTYPE value = 0;
        for( size_t i = 0 ; i < data_points.size() ; i++ ) {
            REAL dr2 = normsq( focus - data_points[i].first );
            if ( dr2 < r2min ) {
                r2min = dr2;
                value = data_points[i].second ;
            }
        }
        return value;
    }
    inline geometry::any_shape<CONFIG> support( point_type focus, REAL domain_mag ) const {
        return geometry::point<CONFIG>( focus );
    }
};
 
}
 
#endif /* MUI_SAMPLER_NN_H_ */