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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: s1851.c,v 1.3 2001-03-19 15:58:54 afr Exp $
*
*/
#define S1851
#include "sislP.h"
#if defined(SISLNEEDPROTOTYPES)
void s1851(SISLSurf *ps1,double epoint[],double enorm[],int idim,
double aepsco,double aepsge,int *jpt,double **gpar,
int *jcrv,SISLIntcurve ***wcurve,int *jstat)
#else
void s1851(ps1,epoint,enorm,idim,aepsco,aepsge,
jpt,gpar,jcrv,wcurve,jstat)
SISLSurf *ps1;
double epoint[];
double enorm[];
int idim;
double aepsco;
double aepsge;
int *jpt;
double **gpar;
int *jcrv;
SISLIntcurve ***wcurve;
int *jstat;
#endif
/*
*********************************************************************
*
*********************************************************************
*
* PURPOSE : Find all intersections between a tensor-product surface
* and a plane.
*
*
*
* INPUT : ps1 - Pointer to surface.
* epoint - SISLPoint in the plane.
* enorm - Normal to the plane.
* idim - Dimension of the space in which the plane lies.
* aepsco - Computational resolution.
* aepsge - Geometry resolution.
*
*
*
* OUTPUT : *jpt - Number of single intersection points.
* gpar - Array containing the parameter values of the
* single intersection points in the parameter
* plane of the surface. The points lie continuous.
* Intersection curves are stored in wcurve.
* *jcrv - Number of intersection curves.
* wcurve - Array containing descriptions of the intersection
* curves. The curves are only described by points
* in the parameter plane. The curve-pointers points
* to nothing. (See description of Intcurve
* in intcurve.dcl).
* jstat - status messages
* > 0 : warning
* = 0 : ok
* < 0 : error
*
*
* METHOD : The vertices of the surface are put into the equation of the
* plane achieving a surface in the one-dimentional space.
* Then the zeroes of this surface is found.
*
*
* REFERENCES : Main routine written by Vibeke Skytt, SI, 1988.
*
* CALLS : sh1851, s6err.
*
* WRITTEN BY : Christophe Rene Birkeland, SINTEF, 93-06.
* Revised by : Paal Fugelli, SINTEF, Oslo, Norway, Oct. 1994.
* Initialized 'jsurf'.
*
*********************************************************************
*/
{
int kstat = 0; /* Local status variable. */
int kpos = 0; /* Position of error. */
int i;
int trackflag = 0;
int jtrack;
SISLTrack **wtrack=SISL_NULL;
int jsurf = 0;
SISLIntsurf **wsurf=SISL_NULL;
int *pretop=SISL_NULL;
sh1851(ps1, epoint, enorm, idim, aepsco, aepsge,trackflag, &jtrack,
&wtrack,jpt, gpar,&pretop,jcrv,wcurve,&jsurf,&wsurf,&kstat);
if(kstat < 0) goto error;
if(pretop != SISL_NULL) freearray(pretop);
for(i=0; i<jsurf; i++)
freeIntsurf(wsurf[i]);
if(wsurf != SISL_NULL) freearray(wsurf);
if(jsurf > 0)
*jstat=10;
else
*jstat = 0;
goto out;
/* Error in lower level routine. */
error :
*jstat = kstat;
s6err("s1851",*jstat,kpos);
goto out;
out:
return;
}
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