PrimitivePatchEdgeLoops.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     3.2
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.
 
    foam-extend 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.
 
    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.
 
Description
    Create the list of loops of outside vertices. Goes wrong on multiply
    connected edges (loops will be unclosed).
 
\*---------------------------------------------------------------------------*/
 
#include "PrimitivePatchTemplate.H"
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template
<
    class Face,
    template<class> class FaceList,
    class PointField,
    class PointType
>
void
Foam::PrimitivePatch<Face, FaceList, PointField, PointType>::
calcEdgeLoops() const
{
    if (debug)
    {
        Info<< "PrimitivePatch<Face, FaceList, PointField, PointType>::"
            << "calcEdgeLoops() : "
            << "calculating boundary edge loops"
            << endl;
    }
 
    if (edgeLoopsPtr_)
    {
        // it is considered an error to attempt to recalculate
        // if already allocated
        FatalErrorIn
        (
            "PrimitivePatch<Face, FaceList, PointField, PointType>::"
            "calcEdgeLoops()"
        )   << "edge loops already calculated"
            << abort(FatalError);
    }
 
    const edgeList& patchEdges = edges();
    label nIntEdges = nInternalEdges();
    label nBdryEdges = patchEdges.size() - nIntEdges;
 
    if (nBdryEdges == 0)
    {
        edgeLoopsPtr_ = new labelListList(0);
        return;
    }
 
    const labelListList& patchPointEdges = pointEdges();
 
 
    //
    // Walk point-edge-point and assign loop number
    //
 
    // Loop per (boundary) edge.
    labelList loopNumber(nBdryEdges, -1);
 
    // Size return list plenty big
    edgeLoopsPtr_ = new labelListList(nBdryEdges);
    labelListList& edgeLoops = *edgeLoopsPtr_;
 
 
    // Current loop number.
    label loopI = 0;
 
    while (true)
    {
        // Find edge not yet given a loop number.
        label currentEdgeI = -1;
 
        for (label edgeI = nIntEdges; edgeI < patchEdges.size(); edgeI++)
        {
            if (loopNumber[edgeI-nIntEdges] == -1)
            {
                currentEdgeI = edgeI;
                break;
            }
        }
 
        if (currentEdgeI == -1)
        {
            // Did not find edge not yet assigned a loop number so done all.
            break;
        }
 
        // Temporary storage for vertices of current loop
        dynamicLabelList loop(nBdryEdges);
 
        // Walk from first all the way round, assigning loops
        label currentVertI = patchEdges[currentEdgeI].start();
 
        do
        {
            loop.append(currentVertI);
 
            loopNumber[currentEdgeI - nIntEdges] = loopI;
 
            // Step to next vertex
            currentVertI = patchEdges[currentEdgeI].otherVertex(currentVertI);
 
            // Step to next (unmarked, boundary) edge.
            const labelList& curEdges = patchPointEdges[currentVertI];
 
            currentEdgeI = -1;
 
            forAll(curEdges, pI)
            {
                label edgeI = curEdges[pI];
 
                if (edgeI >= nIntEdges && (loopNumber[edgeI - nIntEdges] == -1))
                {
                    // Unassigned boundary edge.
                    currentEdgeI = edgeI;
 
                    break;
                }
            }
        }
        while (currentEdgeI != -1);
 
        // Done all for current loop. Transfer to edgeLoops.
        edgeLoops[loopI].transfer(loop);
 
        loopI++;
    }
 
    edgeLoops.setSize(loopI);
 
    if (debug)
    {
        Info<< "PrimitivePatch<Face, FaceList, PointField, PointType>::"
            << "calcEdgeLoops() : "
            << "finished calculating boundary edge loops"
            << endl;
    }
}
 
 
template
<
    class Face,
    template<class> class FaceList,
    class PointField,
    class PointType
>
const Foam::labelListList&
Foam::PrimitivePatch<Face, FaceList, PointField, PointType>::
edgeLoops() const
{
    if (!edgeLoopsPtr_)
    {
        calcEdgeLoops();
    }
 
    return *edgeLoopsPtr_;
}
 
 
// ************************************************************************* //