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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2021 OpenFOAM Foundation
\\/ 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 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/>.
\*---------------------------------------------------------------------------*/
#include "polyLine.H"
// * * * * * * * * * * * * Protected Member Functions * * * * * * * * * * * //
void Foam::polyLine::calcParam()
{
param_.setSize(points_.size());
if (param_.size())
{
param_[0] = 0.0;
for (label i=1; i < param_.size(); i++)
{
param_[i] = param_[i-1] + mag(points_[i] - points_[i-1]);
}
// Normalise on the interval 0-1
lineLength_ = param_.last();
for (label i=1; i < param_.size() - 1; i++)
{
param_[i] /= lineLength_;
}
param_.last() = 1.0;
}
else
{
lineLength_ = 0.0;
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::polyLine::polyLine(const pointField& ps, const bool)
:
points_(ps),
lineLength_(0.0),
param_(0)
{
calcParam();
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
const Foam::pointField& Foam::polyLine::points() const
{
return points_;
}
Foam::label Foam::polyLine::nSegments() const
{
return points_.size()-1;
}
Foam::label Foam::polyLine::localParameter(scalar& lambda) const
{
// Check endpoints
if (lambda < small)
{
lambda = 0;
return 0;
}
else if (lambda > 1 - small)
{
lambda = 1;
return nSegments();
}
// Search table of cumulative distances to find which line-segment
// we are on.
// Check the upper bound.
label segmentI = 1;
while (param_[segmentI] < lambda)
{
segmentI++;
}
segmentI--; // We want the corresponding lower bound
// The local parameter [0-1] on this line segment
lambda =
(lambda - param_[segmentI])/(param_[segmentI+1] - param_[segmentI]);
return segmentI;
}
Foam::point Foam::polyLine::position(const scalar mu) const
{
// Check end-points
if (mu < small)
{
return points_.first();
}
else if (mu > 1 - small)
{
return points_.last();
}
scalar lambda = mu;
label segment = localParameter(lambda);
return position(segment, lambda);
}
Foam::point Foam::polyLine::position
(
const label segment,
const scalar mu
) const
{
// Out-of-bounds
if (segment < 0)
{
return points_.first();
}
else if (segment > nSegments())
{
return points_.last();
}
const point& p0 = points()[segment];
const point& p1 = points()[segment+1];
// Special cases - no calculation needed
if (mu <= 0.0)
{
return p0;
}
else if (mu >= 1.0)
{
return p1;
}
else
{
// Linear interpolation
return points_[segment] + mu*(p1 - p0);
}
}
Foam::scalar Foam::polyLine::length() const
{
return lineLength_;
}
// ************************************************************************* //
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