circleRandom.C

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License
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#include "circleRandom.H"
#include "meshSearch.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace sampledSets
{
    defineTypeNameAndDebug(circleRandom, 0);
    addToRunTimeSelectionTable(sampledSet, circleRandom, word);
}
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
bool Foam::sampledSets::circleRandom::calcSamples
(
    DynamicList<point>& samplingPositions,
    DynamicList<scalar>&,
    DynamicList<label>& samplingSegments,
    DynamicList<label>& samplingCells,
    DynamicList<label>& samplingFaces
) const
{
    const meshSearch& searchEngine = meshSearch::New(mesh());
 
    randomGenerator rndGen(261782, true);
 
    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);
        }
    }
 
    // This set is unordered. Distances have not been created.
    return false;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::sampledSets::circleRandom::circleRandom
(
    const word& name,
    const polyMesh& mesh,
    const dictionary& dict
)
:
    sampledSet(name, mesh, dict),
    centre_(dict.lookup("centre")),
    normal_(normalised(dict.lookup<vector>("normal"))),
    radius_(dict.lookup<scalar>("radius")),
    nPoints_(dict.lookup<label>("nPoints"))
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::sampledSets::circleRandom::~circleRandom()
{}
 
 
// ************************************************************************* //