circleRandom.C

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License
    This file is part of OpenFOAM.

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#include "circleRandom.H"
#include "sampledSet.H"
#include "meshSearch.H"
#include "DynamicList.H"
#include "polyMesh.H"
#include "addToRunTimeSelectionTable.H"
#include "word.H"
#include "mathematicalConstants.H"
#include "Random.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace sampledSets
{
    defineTypeNameAndDebug(circleRandom, 0);
    addToRunTimeSelectionTable(sampledSet, circleRandom, word);
}
}


// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

void Foam::sampledSets::circleRandom::calcSamples
(
    DynamicList<point>& samplingPositions,
    DynamicList<label>& samplingSegments,
    DynamicList<label>& samplingCells,
    DynamicList<label>& samplingFaces
) const
{
    Random rndGen(261782);

    const vector radial1 = normalised(perpendicular(normal_));
    const vector radial2 = normalised(normal_ ^ radial1);

    for (label i = 0; i < nPoints_; ++ i)
    {
        // Request all random numbers simultaneously on all processors so that
        // the generator state stays consistent

        const scalar r = radius_*rndGen.scalar01();
        const scalar theta = 2*constant::mathematical::pi*rndGen.scalar01();
        const scalar c = cos(theta), s = sin(theta);

        const point pt = centre_ + r*(c*radial1 + s*radial2);
        const label celli = searchEngine().findCell(pt);

        if (celli != -1)
        {
            samplingPositions.append(pt);
            samplingSegments.append(i);
            samplingCells.append(celli);
            samplingFaces.append(-1);
        }
    }
}


void Foam::sampledSets::circleRandom::genSamples()
{
    DynamicList<point> samplingPositions;
    DynamicList<label> samplingSegments;
    DynamicList<label> samplingCells;
    DynamicList<label> samplingFaces;

    calcSamples
    (
        samplingPositions,
        samplingSegments,
        samplingCells,
        samplingFaces
    );

    samplingPositions.shrink();
    samplingSegments.shrink();
    samplingCells.shrink();
    samplingFaces.shrink();

    setSamples
    (
        samplingPositions,
        samplingSegments,
        samplingCells,
        samplingFaces
    );
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::sampledSets::circleRandom::circleRandom
(
    const word& name,
    const polyMesh& mesh,
    const meshSearch& searchEngine,
    const dictionary& dict
)
:
    sampledSet(name, mesh, searchEngine, dict),
    centre_(dict.lookup("centre")),
    normal_(normalised(dict.lookup<vector>("normal"))),
    radius_(dict.lookup<scalar>("radius")),
    nPoints_(dict.lookup<label>("nPoints"))
{
    genSamples();
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::sampledSets::circleRandom::~circleRandom()
{}


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