W2.C

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.0
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.
 
    foam-extend 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.
 
    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "W2.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
defineTypeNameAndDebug(W2, 0);
addToRunTimeSelectionTable(RBFFunction, W2, dictionary);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::W2::W2(const scalar radius)
    :
    RBFFunction(),
    radius_(radius)
{}
 
 
Foam::W2::W2(const dictionary& dict)
    :
    RBFFunction(),
    radius_(readScalar(dict.lookup("radius")))
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::W2::~W2()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::scalarField Foam::W2::weights
(
    const vectorField& controlPoints,
    const vector& dataPoint
) const
{
    scalarField dist = mag(controlPoints - dataPoint).ref();
    scalarField RBF(dist.size());
    RBF = neg(dist - radius_) *
          Foam::max(pow4(1 - (dist / radius_)), scalar(0)) * (1 + 4 * (dist / radius_));
    return RBF;
}
 
// ************************************************************************* //