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/*
* Copyright (C) 1998, 2000-2007, 2010, 2011, 2012, 2013 SINTEF ICT,
* Applied Mathematics, Norway.
*
* Contact information: E-mail: tor.dokken@sintef.no
* SINTEF ICT, Department of Applied Mathematics,
* P.O. Box 124 Blindern,
* 0314 Oslo, Norway.
*
* This file is part of SISL.
*
* SISL is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* SISL 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with SISL. If not, see
* <http://www.gnu.org/licenses/>.
*
* In accordance with Section 7(b) of the GNU Affero General Public
* License, a covered work must retain the producer line in every data
* file that is created or manipulated using SISL.
*
* Other Usage
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the SISL library without
* disclosing the source code of your own applications.
*
* This file may be used in accordance with the terms contained in a
* written agreement between you and SINTEF ICT.
*/
#include "sisl-copyright.h"
/*
*
* $Id: s1774.c,v 1.2 2001-03-19 15:58:53 afr Exp $
*
*/
#define S1774
#include "sislP.h"
#if defined(SISLNEEDPROTOTYPES)
void
s1774(SISLCurve *crv, double point[], int dim, double epsge,
double start, double end, double guess, double *clpar, int *stat)
#else
void s1774(crv, point, dim, epsge, start, end, guess, clpar, stat)
SISLCurve *crv;
double point[];
int dim;
double epsge;
double start;
double end;
double guess;
double *clpar;
int *stat;
#endif
/*
*********************************************************************
*
*********************************************************************
*
* PURPOSE : Newton iteration on the distance function between
* a curve and a point, to find a closest point or an
* intersection point.
* If a bad choice for the guess parameter is given in, the
* iteration may end at a local, not global closest point.
*
*
* INPUT : crv - The curve in the closest point problem.
* point - The point in the closest point problem.
* dim - Dimension of the geometry.
* epsge - Geometrical resolution.
* start - Curve parameter giving the start of the search
* interval.
* end - Curve parameter giving the end of the search
* interval.
* guess - Curve guess parameter for the closest point
* iteration.
*
*
*
* OUTPUT : clpar - Resulting curve parameter from the iteration.
* stat - status messages
* = 2 : A minimum distanse found.
* = 1 : Intersection found.
* < 0 : error.
*
*
* METHOD : Newton iteration.
*
*
* REFERENCES :
*
*
* WRITTEN BY : Johannes Kaasa, SINTEF, Aug 1995
*
*********************************************************************
*/
{
int kpos = 0; /* Error indicator. */
SISLPoint* ppoint = SISL_NULL; /* SISL point. */
/* Generate a SISL point. */
ppoint = newPoint(point, dim, 0);
/* Call s1771. */
s1771(ppoint, crv, epsge, start, end, guess, clpar, stat);
if (*stat < 0) goto error;
goto out;
/* Error in lower level routine. */
error :
s6err("s1774", *stat, kpos);
goto out;
out:
if (ppoint != SISL_NULL) freePoint(ppoint);
}
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