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/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 1991-2008 OpenCFD Ltd.
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\\/ M anipulation |
-------------------------------------------------------------------------------
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 2 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, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
\*---------------------------------------------------------------------------*/
#include "mergePoints.H"
#include "SortableList.H"
#include "ListOps.H"
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
bool Foam::mergePoints
(
const UList<point>& points,
const scalar mergeTol,
const bool verbose,
labelList& pointMap,
List<point>& newPoints,
const point& origin
)
{
point compareOrigin = origin;
if (origin == point(VGREAT, VGREAT, VGREAT))
{
if (points.size() > 0)
{
compareOrigin = sum(points)/points.size();
}
}
// Create a old to new point mapping array
pointMap.setSize(points.size());
pointMap = -1;
// Storage for merged points
newPoints.setSize(points.size());
if (points.size() == 0)
{
return false;
}
const scalar mergeTolSqr = sqr(mergeTol);
// Sort points by magSqr
SortableList<scalar> sortedMagSqr(magSqr(points - compareOrigin));
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bool hasMerged = false;
label newPointI = 0;
// Handle 0th point separately (is always unique)
label pointI = sortedMagSqr.indices()[0];
pointMap[pointI] = newPointI;
newPoints[newPointI++] = points[pointI];
for (label sortI = 1; sortI < sortedMagSqr.size(); sortI++)
{
// Get original point index
label pointI = sortedMagSqr.indices()[sortI];
// Compare to previous points to find equal one.
label equalPointI = -1;
for
(
label prevSortI = sortI - 1;
prevSortI >= 0
&& mag
(
sortedMagSqr[prevSortI]
- sortedMagSqr[sortI]
) <= mergeTolSqr;
prevSortI--
)
{
label prevPointI = sortedMagSqr.indices()[prevSortI];
if (magSqr(points[pointI] - points[prevPointI]) <= mergeTolSqr)
{
// Found match.
equalPointI = prevPointI;
break;
}
}
if (equalPointI != -1)
{
// Same coordinate as equalPointI. Map to same new point.
pointMap[pointI] = pointMap[equalPointI];
hasMerged = true;
if (verbose)
{
Pout<< "Foam::mergePoints : Merging points "
<< pointI << " and " << equalPointI
<< " with coordinates:" << points[pointI]
<< " and " << points[equalPointI]
<< endl;
}
}
else
{
// Differs. Store new point.
pointMap[pointI] = newPointI;
newPoints[newPointI++] = points[pointI];
}
}
newPoints.setSize(newPointI);
return hasMerged;
}
// ************************************************************************* //