polyLine.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2020-2021 OpenCFD Ltd.
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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
    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::polyLine
 
Description
    A series of straight line segments, which can also be interpreted as
    a series of control points for splines, etc.
 
    A future implementation could also handle a closed polyLine.
 
SourceFiles
    polyLine.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef polyLine_H
#define polyLine_H
 
#include "pointField.H"
#include "scalarList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                          Class polyLine Declaration
\*---------------------------------------------------------------------------*/
 
class polyLine
{
protected:
 
    // Protected Data
 
        //- The control points or ends of each segments
        pointField points_;
 
        //- The real (total) line length
        scalar lineLength_;
 
        //- The rational (0-1) cumulative parameter value for each point
        scalarList param_;
 
 
    // Protected Member Functions
 
        //- Precalculate the rational cumulative parameter value
        //- and the line-length
        void calcParam();
 
        //- Return the line segment and the local parameter [0..1]
        //- corresponding to the global lambda [0..1]
        label localParameter(scalar& lambda) const;
 
 
public:
 
    // Constructors
 
        //- Construct from components
        explicit polyLine
        (
            const pointField& points,   
            const bool notImplementedClosed = false
        );
 
        //- Construct from begin, intermediate, end points
        polyLine
        (
            const point& start,             
            const pointField& intermediate, 
            const point& end,               
            const bool notImplementedClosed = false
        );
 
 
    // Static Member Functions
 
        //- Concatenate begin, intermediate and end points
        static tmp<pointField> concat
        (
            const point& start,             
            const pointField& intermediate, 
            const point& end                
        );
 
 
    // Member Functions
 
        //- Return const-access to the control-points
        const pointField& points() const noexcept;
 
        //- The number of line segments
        label nSegments() const noexcept;
 
        //- The point position corresponding to the curve parameter
        //  0 <= lambda <= 1
        point position(const scalar) const;
 
        //- The point position corresponding to the local parameter
        //  0 <= lambda <= 1 on the given segment
        point position(const label segment, const scalar) const;
 
        //- The length of the curve
        scalar length() const noexcept;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //