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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: s1860.c,v 1.4 2001-03-19 15:58:55 afr Exp $
*
*/
#define S1860
#include "sislP.h"
#if defined(SISLNEEDPROTOTYPES)
void s1860(SISLSurf *ps,double eview[],int idim,double aepsco,double aepsge,
int *jpt,double **gpar,int *jcrv,SISLIntcurve ***wcurve,int *jstat)
#else
void s1860(ps,eview,idim,aepsco,aepsge,jpt,gpar,jcrv,wcurve,jstat)
SISLSurf *ps;
double eview[];
int idim;
double aepsco;
double aepsge;
int *jpt;
double **gpar;
int *jcrv;
SISLIntcurve ***wcurve;
int *jstat;
#endif
/*
*********************************************************************
*
*********************************************************************
*
* PURPOSE : Find the silhouette curves and points of a surface when
* the surface is viewed from a specific direction. In
* addition to the points and curves found by this routine,
* break curves and edge-curves might be silhouette curves.
*
*
*
* INPUT : ps - Pointer to the surface.
* eview - The direction vector of the viewing.
* idim - Dimension of the space in which eview lies.
* aepsco - Computational resolution.
* aepsge - Geometry resolution.
*
*
*
* OUTPUT : jpt - Number of single silhouette points.
* gpar - Array containing the parameter values of the
* single silhouette points in the parameter
* plane of the surface. The points lie continuous.
* Silhouette curves are stored in wcurve.
* jcrv - Number of silhouette curves.
* wcurve - Array containing descriptions of the silhouette
* 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 :
*
*
* REFERENCES : Main routine written by Vibeke Skytt, SI, 1988.
*
* CALLS : sh1860, s6err.
*
* WRITTEN BY : Christophe Rene Birkeland, SINTEF, 93-06.
* Revised by : Paal Fugelli, SINTEF, Oslo, Norway, Jan. 1995.
* Made deallocation of 'wsurf' safer.
*
*********************************************************************
*/
{
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;
SISLIntsurf **wsurf=SISL_NULL;
int *pretop=SISL_NULL;
sh1860(ps,eview,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);
if ( wsurf != SISL_NULL )
{
for( i=0; i < jsurf; i++ )
if ( wsurf[i] != SISL_NULL ) freeIntsurf(wsurf[i]);
freearray(wsurf);
}
if(jsurf > 0)
*jstat=10;
else
*jstat = 0;
goto out;
/* Error in lower level routine. */
error :
*jstat = kstat;
s6err("s1860",*jstat,kpos);
goto out;
out:
return;
}
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