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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: pickcrvsf.c,v 1.2 2001-03-19 15:58:40 afr Exp $
*
*/
#define PICK_CRV_SF
#include "sislP.h"
#if defined(SISLNEEDPROTOTYPES)
void
pick_crv_sf(SISLObject *po1, SISLObject *po2,int ipar,
SISLIntpt *pt1,SISLIntpt *pt2,SISLCurve **rcrv,
int *jstat)
#else
void pick_crv_sf(po1,po2,ipar,pt1,pt2,rcrv,jstat)
SISLObject *po1;
SISLObject *po2;
int ipar;
SISLIntpt *pt1;
SISLIntpt *pt2;
SISLCurve **rcrv;
int *jstat;
#endif
/*
*********************************************************************
*
*********************************************************************
*
* PURPOSE : Pick a curve along a given parameter direction
* in a surface.
*
*
* INPUT : po1 - first object in intersection.
* po2 - second object in intersection.
* pt1 - first intersection point.
* pt2 - second intersection point.
* ipar - index of constant parameter value
*
*
*
* OUTPUT : rcrv - SISL curve.
* jstat - status messages
* > 0 : warning
* = 0 : ok
* < 0 : error
*
*
* METHOD :
*
*
* REFERENCES :
*
*-
* CALLS : s1436 - Pick curve with constant second parameter.
* s1437 - Pick curve with constant first parameter.
*
* WRITTEN BY : UJK, SI, 91-09.
*
*********************************************************************
*/
{
int kstat = 0; /* Local status parameter. */
int kpos = 0; /* Position of error. */
int index=0; /* Index of other par dir in surf. */
int first_const; /* Flag, const first direction or not */
double tpar; /* Parameter value of curve in constant parameter
direction. */
SISLSurf *ps1=SISL_NULL; /* Pointer to surf to pick crv from */
SISLCurve *pick_crv=SISL_NULL;/* Picked curve before trimming. */
/* -------------------------------------------------------------------- */
if (ipar < 0 || ipar >= po1->iobj + po2->iobj) goto errinp;
if (ipar >= po1->iobj)
{
/* pick from second object (must be a sf) */
if (po2->iobj != SISLSURFACE) goto errinp;
ps1 = po2->s1;
index = (ipar == po1->iobj) ? po1->iobj + 1 : po1->iobj;
}
else
{
/* pick from first object (must be a sf) */
if (po1->iobj != SISLSURFACE) goto errinp;
ps1 = po1->s1;
index = (ipar == 0) ? 1 : 0;
}
if (ipar < index) first_const = TRUE;
else first_const = FALSE;
tpar = pt1->epar[ipar];
if (first_const == FALSE)
{
/* Pick curve with constant second parameter. */
s1436(ps1,tpar,&pick_crv,&kstat);
if (kstat < 0) goto error;
}
else
{
/* Pick curve with constant first parameter. */
s1437(ps1,tpar,&pick_crv,&kstat);
if (kstat < 0) goto error;
}
/* SISLCurve picked, now trim it. */
if (DEQUAL(pt1->epar[index], pick_crv->et[pick_crv->ik-1]) &&
DEQUAL(pt2->epar[index], pick_crv->et[pick_crv->in]))
{
/* Return the whole curve */
(*rcrv) = pick_crv;
pick_crv = SISL_NULL;
}
else if(DEQUAL(pt1->epar[index], pick_crv->et[pick_crv->in]) &&
DEQUAL(pt2->epar[index], pick_crv->et[pick_crv->ik-1]))
{
/* Return the whole curve, but turn it first */
/* Return the whole curve */
(*rcrv) = pick_crv;
pick_crv = SISL_NULL;
s1706(*rcrv);
}
else
{
/* Return a part of the curve */
double amin = min(pt1->epar[index], pt2->epar[index]);
double amax = max(pt1->epar[index], pt2->epar[index]);
if (pick_crv->cuopen == SISL_CRV_PERIODIC)
s1713(pick_crv,amin,amax,rcrv,&kstat);
else
s1712(pick_crv,amin,amax,rcrv,&kstat);
if (kstat < 0) goto error;
if (pt1->epar[index] > pt2->epar[index]) s1706(*rcrv);
}
*jstat = 0;
goto out;
/* Error in input. */
errinp : *jstat = -1;
s6err("pick_crv_sf",*jstat,kpos);
goto out;
/* Error in lower level routine. */
error : *jstat = kstat;
s6err("pick_crv_sf",*jstat,kpos);
goto out;
out: if (pick_crv) freeCurve(pick_crv);
}
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