Creation of OpenFOAM-dev repository 15/04/2008

applications/utilities/mesh/generation/blockMesh/curvedEdges/polyLine.C

@@ -0,0 +1,137 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 1991-2007 OpenCFD Ltd.
+     \\/     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
+
+Description
+    polyLineEdge class : defines a curvedEdge in terms of a series of
+    straight line segments
+
+\*---------------------------------------------------------------------------*/
+
+#include "error.H"
+
+#include "polyLine.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
+
+// calcDistances generates the distances_ lookup table (cumulative
+// distance along the line) from the individual vectors to the points
+
+void polyLine::calcDistances()
+{
+    distances_[0] = 0.0;
+
+    for (label i=1; i<distances_.size(); i++)
+    {
+        distances_[i] =
+            mag(controlPoints_[i] - controlPoints_[i-1])
+          + distances_[i-1];
+    }
+
+    lineLength_ = distances_[distances_.size()-1];
+
+    for (label i=1; i<distances_.size(); i++)
+    {
+        distances_[i] /= lineLength_;
+    }
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+polyLine::polyLine(const pointField& ps)
+:
+    controlPoints_(ps),
+    distances_(ps.size())
+{
+    if (ps.size())
+    {
+        calcDistances();
+    }
+}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+vector polyLine::position(const scalar lambda) const
+{
+    // check range of lambda
+
+    if (lambda < 0 || lambda > 1)
+    {
+        FatalErrorIn("polyLine::position(const scalar)")
+            << "Parameter out of range, "
+            << "lambda = " << lambda
+            << abort(FatalError);
+    }
+
+    // Quick calc of endpoints
+
+    if (lambda < SMALL)
+    {
+        return controlPoints_[0];
+    }
+    else if (lambda > 1 - SMALL)
+    {
+        return controlPoints_[controlPoints_.size()-1];
+    }
+
+
+    // search table of cumulative distance to find which linesegment we
+    // are on
+
+    label i(0);
+    do
+    {
+        i++;
+    } while (distances_[i] < lambda);
+
+    i--;               // we overshot!
+
+    // construct position vector
+    scalar offsetDist =
+        (lambda - distances_[i])
+       /(distances_[i+1] - distances_[i]);
+
+    vector offsetV = controlPoints_[i+1] - controlPoints_[i];
+
+    return controlPoints_[i] + offsetDist*offsetV;
+}
+
+
+scalar polyLine::length() const
+{
+    return lineLength_;
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// ************************************************************************* //