lumpedPointInterpolator.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2019-2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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    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.
 
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    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::lumpedPointInterpolator
 
Description
    A simple linear interpolator between two locations, which are
    referenced by index.
 
    When the interpolator is built for based on searching for nearest and
    next-nearest points, the interpolation will typically cover a (0-0.5) range
    rather than a (0-1) range. The (0.5-1) range implies a flip in the
    relationship of nearest vs. next-nearest.
 
SourceFiles
    lumpedPointInterpolatorI.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_lumpedPointInterpolator_H
#define Foam_lumpedPointInterpolator_H
 
#include "Pair.H"
#include "triFace.H"
#include "scalarList.H"
#include "barycentric2D.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                     Class lumpedPointInterpolator Declaration
\*---------------------------------------------------------------------------*/
 
class lumpedPointInterpolator
{
    // Private Data
 
        //- The id of the nearest point
        label nearest_;
 
        //- The id of the neighbour point(s)
        label next1_, next2_;
 
        //- The interpolation weight for the neighbour point(s)
        scalar weight1_, weight2_;
 
 
public:
 
    // Constructors
 
        //- Default construct, with zero weighting and invalid ids
        inline lumpedPointInterpolator();
 
        //- Construct with nearest id
        explicit inline lumpedPointInterpolator(const label id);
 
 
    //- Destructor
    ~lumpedPointInterpolator() = default;
 
 
    // Member Functions
 
    // Access
 
        //- True if there is an associated nearest point
        inline bool good() const;
 
        //- Same as good()
        bool valid() const { return good(); }
 
        //- The nearest control point, or -1 if !good()
        inline label nearest() const;
 
        //- The first neighbour control point - identical to next1()
        inline label next() const;
 
        //- The first neighbour control point, or -1 if !good()
        inline label next1() const;
 
        //- The second neighbour control point, or -1 if !good()
        inline label next2() const;
 
        //- The weighting for the nearest point
        inline scalar weight0() const;
 
        //- The weighting for the first neighbour point,
        //- this also corresponds to the logical location (interval 0-1)
        inline scalar weight1() const;
 
        //- The weighting for the second neighbour point,
        //- this also corresponds to the logical location (interval 0-1)
        inline scalar weight2() const;
 
 
    // Edit
 
        //- Assign the nearest point, clearing any neighbour
        inline void nearest(const label id);
 
        //- Assign single neighbour control point and its weight
        inline void next(const label id, const scalar weight);
 
        //- Assign the neighbour control point and its weight
        inline void next
        (
            const label id,
            const scalar weight,
            const label position    
        );
 
        //- Assign all control points and their weights
        //  The triFace points [0,1,2] correspond to [nearest,next1,next2],
        //  respectively
        inline void set(const triFace& ids, const barycentric2D& weights);
 
 
    // Evalulate
 
        //- Linear interpolated value between nearest and next locations
        template<class T>
        inline T interpolate(const UList<T>& input) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "lumpedPointInterpolatorI.H"
 
#endif
 
// ************************************************************************* //