/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2012-2015 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM 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.

    OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::piecewiseLinearRamp

Description
    A linear ramp between 0 and 1 with definable start and end points.

SourceFiles
    piecewiseLinearRamp.C

\*---------------------------------------------------------------------------*/

#ifndef piecewiseLinearRamp_H
#define piecewiseLinearRamp_H

#include "faceAreaWeightModel.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class piecewiseLinearRamp Declaration
\*---------------------------------------------------------------------------*/

class piecewiseLinearRamp
:
    public faceAreaWeightModel
{

private:

    // Private data

        //- Face area fraction below which a weight of 0 is returned
        scalar lAF_;

        //- Face area fraction above which a which of 1 is returned
        scalar uAF_;

public:

    //- Runtime type information
    TypeName("piecewiseLinearRamp");

    // Constructors

        //- Construct from components
        piecewiseLinearRamp
        (
            const dictionary& faceAreaWeightDict
        );


    //- Destructor
    virtual ~piecewiseLinearRamp()
    {}


    // Member Functions

        //- Return the faceAreaWeight
        virtual scalar faceAreaWeight(scalar faceAreaFraction) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
