Square.H

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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
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    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::Function1s::Square
 
Description
    Templated square-wave function with support for an offset level.
 
        \f[
            a square(f (x - x_0) ) + l
        \f]
 
    where
 
    \f$square(x)\f$ is the square-wave function in range \f$[-1, 1]\f$ with a
    mark/space ratio of \f$r\f$
 
    \vartable
        Symbol  | Description      | Data type       | Default
        a       | Amplitude        | Function1<Type> |
        f       | Frequency        | scalar          |
        x_0     | Phase            | scalar          | 0
        l       | Offset level     | Function1<Type> |
        r       | Mark/space ratio | scalar          | 1
    \endvartable
 
    Example for a scalar:
    \verbatim
        <name> square;
        <name>Coeffs
        {
            amplitude 2e-7;
            frequency 10;
            start     0;
            level     2e-6;
            markSpace 0.5;
        }
    \endverbatim
 
    Example for a vector:
    \verbatim
        <name> square;
        <name>Coeffs
        {
            amplitude (1 0.1 0);
            frequency 10;
            start     0;
            level     (10 1 0);
            markSpace 0.5;
        }
    \endverbatim
 
SourceFiles
    Square.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Square_H
#define Square_H
 
#include "Function1.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Function1s
{
 
/*---------------------------------------------------------------------------*\
                           Class Square Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class Square
:
    public FieldFunction1<Type, Square<Type>>
{
    // Private Data
 
        //- Scalar amplitude of the square function
        const autoPtr<Function1<Type>> amplitude_;
 
        //- Frequency of the square function
        const scalar frequency_;
 
        //- Argument offset
        const scalar start_;
 
        //- Level to which the square function is added
        const autoPtr<Function1<Type>> level_;
 
        //- Mark/space ratio of the square function; the fraction of one period
        //  in which the function value is at the higher of the two possible
        //  values.
        const scalar markSpace_;
 
        //- Is this function integrable?
        const bool integrable_;
 
 
public:
 
    // Runtime type information
    TypeName("square");
 
 
    // Constructors
 
        //- Construct from name and dictionary
        Square
        (
            const word& name,
            const unitConversions& units,
            const dictionary& dict
        );
 
        //- Copy constructor
        Square(const Square<Type>& se);
 
 
    //- Destructor
    virtual ~Square();
 
 
    // Member Functions
 
        //- Return value
        virtual inline Type value(const scalar x) const;
 
        //- Integrate between two values
        virtual inline Type integral(const scalar x1, const scalar x2) const;
 
        //- Write data to dictionary stream
        virtual void write(Ostream& os, const unitConversions& units) const;
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const Square<Type>&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Function1s
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "SquareI.H"
 
#ifdef NoRepository
    #include "Square.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //