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123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "interpolateXY.H"
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#include "primitiveFields.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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template<class Type>
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Field<Type> interpolateXY
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(
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const scalarField& xNew,
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const scalarField& xOld,
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const Field<Type>& yOld
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)
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{
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Field<Type> yNew(xNew.size());
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forAll(xNew, i)
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{
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yNew[i] = interpolateXY(xNew[i], xOld, yOld);
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}
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return yNew;
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}
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template<class Type>
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Type interpolateXY
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(
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const scalar x,
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const scalarField& xOld,
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const Field<Type>& yOld
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)
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{
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label n = xOld.size();
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label lo = 0;
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for (lo=0; lo<n && xOld[lo]>x; ++lo)
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{}
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label low = lo;
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if (low < n)
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{
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for (label i=low; i<n; ++i)
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{
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if (xOld[i] > xOld[lo] && xOld[i] <= x)
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{
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lo = i;
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}
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}
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}
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label hi = 0;
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for (hi=0; hi<n && xOld[hi]<x; ++hi)
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{}
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label high = hi;
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if (high < n)
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{
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for (label i=high; i<n; ++i)
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{
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if (xOld[i] < xOld[hi] && xOld[i] >= x)
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{
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hi = i;
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}
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}
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}
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if (lo<n && hi<n && lo != hi)
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{
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return yOld[lo]
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+ ((x - xOld[lo])/(xOld[hi] - xOld[lo]))*(yOld[hi] - yOld[lo]);
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}
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else if (lo == hi)
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{
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return yOld[lo];
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}
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else if (lo == n)
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{
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return yOld[hi];
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}
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else
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{
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return yOld[lo];
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}
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// ************************************************************************* //
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