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ENH: triangle: added nearest to line

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This commit is contained in:
mattijs
2013-04-19 11:23:12 +01:00
parent 98ea287b2c
commit 346eb9739c
2 changed files with 138 additions and 2 deletions
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12
src/OpenFOAM/meshes/primitiveShapes/triangle/triangle.H
View File

@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2011-2013 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -42,6 +42,7 @@ SourceFiles
#include "Random.H"
#include "FixedList.H"
#include "UList.H"
#include "linePointRef.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@ -222,6 +223,15 @@ public:
label& nearLabel
) const;
//- Return nearest point to line on triangle. Returns hit if
// point is inside triangle. Sets edgePoint to point on edge
// (hit if nearest is inside line)
inline pointHit nearestPoint
(
const linePointRef& edge,
pointHit& edgePoint
) const;
// IOstream operators

128
src/OpenFOAM/meshes/primitiveShapes/triangle/triangleI.H
View File

@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2011-2013 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -659,6 +659,132 @@ inline bool Foam::triangle<Point, PointRef>::classify
}
template<class Point, class PointRef>
inline Foam::pointHit Foam::triangle<Point, PointRef>::nearestPoint
(
const linePointRef& ln,
pointHit& lnInfo
) const
{
vector q = ln.vec();
pointHit triInfo
(
triangle<Point, PointRef>::intersection
(
ln.start(),
q,
intersection::FULL_RAY
)
);
if (triInfo.hit())
{
// Line hits triangle. Find point on line.
if (triInfo.distance() > 1)
{
// Hit beyond endpoint
lnInfo.setMiss(true);
lnInfo.setPoint(ln.end());
scalar dist = Foam::mag(triInfo.hitPoint()-lnInfo.missPoint());
lnInfo.setDistance(dist);
triInfo.setMiss(true);
triInfo.setDistance(dist);
}
else if (triInfo.distance() < 0)
{
// Hit beyond startpoint
lnInfo.setMiss(true);
lnInfo.setPoint(ln.start());
scalar dist = Foam::mag(triInfo.hitPoint()-lnInfo.missPoint());
lnInfo.setDistance(dist);
triInfo.setMiss(true);
triInfo.setDistance(dist);
}
else
{
// Hit on line
lnInfo.setHit();
lnInfo.setPoint(triInfo.hitPoint());
lnInfo.setDistance(0.0);
triInfo.setDistance(0.0);
}
}
else
{
// Line skips triangle. See which triangle edge it gets closest to
point nearestEdgePoint;
point nearestLinePoint;
label minEdgeIndex = 0;
scalar minDist = ln.nearestDist
(
linePointRef(a_, b_),
nearestLinePoint,
nearestEdgePoint
);
{
point linePoint;
point triEdgePoint;
scalar dist = ln.nearestDist
(
linePointRef(b_, c_),
linePoint,
triEdgePoint
);
if (dist < minDist)
{
minDist = dist;
nearestEdgePoint = triEdgePoint;
nearestLinePoint = linePoint;
minEdgeIndex = 1;
}
}
{
point linePoint;
point triEdgePoint;
scalar dist = ln.nearestDist
(
linePointRef(c_, a_),
linePoint,
triEdgePoint
);
if (dist < minDist)
{
minDist = dist;
nearestEdgePoint = triEdgePoint;
nearestLinePoint = linePoint;
minEdgeIndex = 2;
}
}
lnInfo.setDistance(minDist);
triInfo.setDistance(minDist);
triInfo.setMiss(false);
triInfo.setPoint(nearestEdgePoint);
// Convert point on line to pointHit
if (Foam::mag(nearestLinePoint-ln.start()) < SMALL)
{
lnInfo.setMiss(true);
lnInfo.setPoint(ln.start());
}
else if (Foam::mag(nearestLinePoint-ln.end()) < SMALL)
{
lnInfo.setMiss(true);
lnInfo.setPoint(ln.end());
}
else
{
lnInfo.setHit();
lnInfo.setPoint(nearestLinePoint);
}
}
return triInfo;
}
// * * * * * * * * * * * * * * * Ostream Operator * * * * * * * * * * * * * //
template<class Point, class PointRef>