searchableBox.H

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License
    This file is part of OpenFOAM.

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Class
    Foam::searchableBox

Description
    Surface geometry with a rectangular box shape, aligned with the coordinate
    axes, which can be used with snappyHexMesh.

Usage
    \table
        Property  | Description                    | Required
        min       | Minimum point of bounding box  | yes
        max       | Maximum point of bounding box  | yes
    \endtable

    Example specification in snappyHexMeshDict/geometry:
    \verbatim
        type       searchableBox;
        min        (0  0  0);
        max        (10 10 10);
    \endverbatim

SourceFiles
    searchableBox.C

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

#ifndef searchableBox_H
#define searchableBox_H

#include "searchableSurface.H"
#include "treeBoundBox.H"

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

namespace Foam
{

// Forward declaration of classes

/*---------------------------------------------------------------------------*\
                        Class searchableBox Declaration
\*---------------------------------------------------------------------------*/

class searchableBox
:
    public searchableSurface,
    public treeBoundBox
{
    // Private Member Data

        mutable wordList regions_;


    // Private Member Functions

        //- Project onto component dir of planePt and update index() (=face)
        void projectOntoCoordPlane
        (
            const direction dir,
            const point& planePt,
            pointIndexHit& info
        ) const;

        //- Inherit findNearest from searchableSurface
        using searchableSurface::findNearest;

        //- Returns miss or hit with face (0..5)
        pointIndexHit findNearest
        (
            const point& bbMid,
            const point& sample,
            const scalar nearestDistSqr
        ) const;


public:

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


    // Constructors

        //- Construct from components
        searchableBox(const IOobject& io, const treeBoundBox& bb);

        //- Construct from dictionary (used by searchableSurface)
        searchableBox
        (
            const IOobject& io,
            const dictionary& dict
        );

        //- Disallow default bitwise copy construction
        searchableBox(const searchableBox&) = delete;


    //- Destructor
    virtual ~searchableBox();


    // Member Functions

        virtual const wordList& regions() const;

        //- Whether supports volume type below
        virtual bool hasVolumeType() const
        {
            return true;
        }

        //- Range of local indices that can be returned.
        virtual label size() const
        {
            return 6;
        }

        //- Get representative set of element coordinates
        //  Usually the element centres (should be of length size()).
        virtual tmp<pointField> coordinates() const;

        //- Get bounding spheres (centre and radius squared), one per element.
        //  Any point on element is guaranteed to be inside.
        virtual void boundingSpheres
        (
            pointField& centres,
            scalarField& radiusSqr
        ) const;

        //- Get the points that define the surface.
        virtual tmp<pointField> points() const;

        // Does any part of the surface overlap the supplied bound box?
        virtual bool overlaps(const boundBox& bb) const
        {
            return boundBox::overlaps(bb);
        }

        // Single point queries.

            //- Calculate nearest point on surface.
            //  Returns
            //  - bool : any point found nearer than nearestDistSqr
            //  - label: relevant index in surface (=face 0..5)
            //  - point: actual nearest point found
            pointIndexHit findNearest
            (
                const point& sample,
                const scalar nearestDistSqr
            ) const;

            //- Calculate nearest point on edge.
            //  Returns
            //  - bool : any point found nearer than nearestDistSqr
            //  - label: relevant index in surface(=?)
            //  - point: actual nearest point found
            pointIndexHit findNearestOnEdge
            (
                const point& sample,
                const scalar nearestDistSqr
            ) const;

            //- Find nearest to segment.
            //  Returns
            //  - bool : any point found?
            //  - label: relevant index in shapes (=face 0..5)
            //  - point: actual nearest point found
            //  sets:
            //  - tightest  : bounding box
            //  - linePoint : corresponding nearest point on line
            pointIndexHit findNearest
            (
                const linePointRef& ln,
                treeBoundBox& tightest,
                point& linePoint
            ) const;

            //- Find nearest intersection of line between start and end.
            pointIndexHit findLine
            (
                const point& start,
                const point& end
            ) const;

            //- Find any intersection of line between start and end.
            pointIndexHit findLineAny
            (
                const point& start,
                const point& end
            ) const;


        // Multiple point queries.

            virtual void findNearest
            (
                const pointField& sample,
                const scalarField& nearestDistSqr,
                List<pointIndexHit>&
            ) const;

            virtual void findLine
            (
                const pointField& start,
                const pointField& end,
                List<pointIndexHit>&
            ) const;

            virtual void findLineAny
            (
                const pointField& start,
                const pointField& end,
                List<pointIndexHit>&
            ) const;

            //- Get all intersections in order from start to end.
            virtual void findLineAll
            (
                const pointField& start,
                const pointField& end,
                List<List<pointIndexHit>>&
            ) const;

            //- From a set of points and indices get the region
            virtual void getRegion
            (
                const List<pointIndexHit>&,
                labelList& region
            ) const;

            //- From a set of points and indices get the normal
            virtual void getNormal
            (
                const List<pointIndexHit>&,
                vectorField& normal
            ) const;

            //- Determine type (inside/outside/mixed) for point. unknown if
            //  cannot be determined (e.g. non-manifold surface)
            virtual void getVolumeType
            (
                const pointField&,
                List<volumeType>&
            ) const;


        // regIOobject implementation

            bool writeData(Ostream&) const
            {
                NotImplemented;
                return false;
            }


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const searchableBox&) = delete;
};


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

} // End namespace Foam

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

#endif

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