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) 2020-2023 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
    //
 
    // Temporary storage for vertices of current loop
    DynamicList<label> loop(nBdryEdges);
 
    // In a loop? - per boundary edge
    boolList unvisited(nBdryEdges, true);
 
    // Current loop number
    label numLoops = 0;
 
    // Walk all boundary edges not yet in a loop
    for
    (
        label bndEdgei = -1;
        (bndEdgei = unvisited.find(true)) >= 0;
        /*nil*/
    )
    {
        label currentEdgei = (bndEdgei + nIntEdges);
 
        // Walk from first all the way round, assigning loops
        label currentVerti = patchEdges[currentEdgei].first();
 
        loop.clear();
 
        do
        {
            loop.push_back(currentVerti);
 
            unvisited[currentEdgei - nIntEdges] = false;
 
            // Step to next vertex
            currentVerti = patchEdges[currentEdgei].otherVertex(currentVerti);
 
            // Step to next (unmarked, boundary) edge.
            currentEdgei = -1;
 
            for (const label edgei : patchPointEdges[currentVerti])
            {
                if (edgei >= nIntEdges && unvisited[edgei - nIntEdges])
                {
                    // Unvisited boundary edge
                    currentEdgei = edgei;
                    break;
                }
            }
        }
        while (currentEdgei != -1);
 
        // Done all for current loop - copy to edgeLoops
        edgeLoops[numLoops] = loop;
 
        ++numLoops;
    }
 
    edgeLoops.resize(numLoops);
 
    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_;
}
 
 
// ************************************************************************* //