PrimitivePatchEdgeLoops.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2020-2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
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/>.
 
Description
    Create the list of loops of outside vertices. Goes wrong on multiply
    connected edges (loops will be unclosed).
 
\*---------------------------------------------------------------------------*/
 
#include "PrimitivePatch.H"
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class FaceList, class PointField>
void
Foam::PrimitivePatch<FaceList, PointField>::calcEdgeLoops() const
{
    DebugInFunction << "Calculating boundary edge loops" << endl;
 
    if (edgeLoopsPtr_)
    {
        // An error to recalculate if already allocated
        FatalErrorInFunction
            << "edge loops already calculated"
            << abort(FatalError);
    }
 
    const edgeList& patchEdges = edges();
    const label nIntEdges = nInternalEdges();
    const label nBdryEdges = patchEdges.size() - nIntEdges;
 
    // Size return list plenty big
    edgeLoopsPtr_.reset(new labelListList(nBdryEdges));
    auto& edgeLoops = *edgeLoopsPtr_;
 
    if (nBdryEdges == 0)
    {
        return;
    }
 
    const labelListList& patchPointEdges = pointEdges();
 
 
    //
    // Walk point-edge-point and assign loop number
    //
 
    // Loop per (boundary) edge.
    labelList loopNumber(nBdryEdges, -1);
 
    // 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
        DynamicList<label> 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);
 
    DebugInFunction << "Calculated boundary edge loops" << nl;
}
 
 
template<class FaceList, class PointField>
const Foam::labelListList&
Foam::PrimitivePatch<FaceList, PointField>::edgeLoops() const
{
    if (!edgeLoopsPtr_)
    {
        calcEdgeLoops();
    }
 
    return *edgeLoopsPtr_;
}
 
 
// ************************************************************************* //