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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: sh1371.c,v 1.2 2001-03-19 15:59:03 afr Exp $
*
*/
#define SH1371
#include "sislP.h"
#if defined(SISLNEEDPROTOTYPES)
void
sh1371(SISLCurve *pc1,double ecentr[],double aradiu,int idim,
double aepsco,double aepsge,
int trackflag,int *jtrack,SISLTrack ***wtrack,
int *jpt,double **gpar,int **pretop,int *jcrv,
SISLIntcurve ***wcurve,int *jstat)
#else
void sh1371(pc1,ecentr,aradiu,idim,aepsco,aepsge,
trackflag,jtrack,wtrack,jpt,gpar,pretop,jcrv,wcurve,jstat)
SISLCurve *pc1;
double ecentr[];
double aradiu;
int idim;
double aepsco;
double aepsge;
int trackflag;
int *jtrack;
SISLTrack ***wtrack;
int *jpt;
double **gpar;
int **pretop;
int *jcrv;
SISLIntcurve ***wcurve;
int *jstat;
#endif
/*
*********************************************************************
*
*********************************************************************
*
* PURPOSE : Find all intersections between a curve and a sphere if
* the dimension is equal to three and a curve and a circle
* if the dimension is two.
*
*
*
* INPUT : pc1 - Pointer to the curve.
* ecentr - Center of circle/sphere
* aradiu - Radius of the circle or sphere
* idim - Dimension of the space in which the plane/line
* lies. idim should be equal to two or three.
* aepsco - Computational resolution.
* aepsge - Geometry resolution.
* trackflag - If true, create tracks.
*
*
*
* OUTPUT : jtrack - Number of tracks created
* wtrack - Array of pointers to tracks
* jpt - Number of single intersection points.
* gpar - Array containing the parameter values of the
* single intersection points in the parameter
* interval of the curve. The points lie continuous.
* Intersection curves are stored in wcurve.
* pretop - Topology info. for single intersection points.
* *jcrv - Number of intersection curves.
* wcurve - Array containing descriptions of the intersection
* curves. The curves are only described by points
* in the parameter interval. 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 curve is put into the equation of the
* sphere/circle achieving a curve in the one-dimentional space.
* The zeroes of this curve is found.
*
*
* REFERENCES :
*
*-
* CALLS : sh1761 - Find point/curve intersections.
* hp_s1880 - Put intersections into output format.
* s1321 - Make implicit description of
* circle/sphere as matrix
* s1370 - Put curve into implicit equation
* make_cv_kreg - Ensure k-regularity of input curve.
* newCurve - Create new curve.
* newPoint - Create new point.
* newObject - Create new object.
* freeObject - Free the space occupied by a given object.
* freeIntdat - Free the space occupied by intersection result.
*
* WRITTEN BY : Tor Dokken, SI, 88-05.
* REWRITTEN BY : Bjoern Olav Hoset, SI, 89-06.
*
*********************************************************************
*/
{
double *nullp = SISL_NULL;
int kstat = 0; /* Local status variable. */
int kpos = 0; /* Position of error. */
int kdim=1; /* Dimension of curve in curve/point intersection.*/
double sarray[16]; /* Array for represetnation of implicit surface */
double spoint[1]; /* SISLPoint in curve/point intersection. */
double *spar = SISL_NULL; /* Values of intersections in the parameter
area of the second object. Empty in this case. */
SISLCurve *qc = SISL_NULL; /* Pointer to curve in curve/point intersection. */
SISLPoint *qp = SISL_NULL; /* Pointer to point in curve/point intersection. */
SISLObject *qo1 = SISL_NULL; /* Pointer to object in
object/point intersection.*/
SISLObject *qo2 = SISL_NULL; /* Pointer to object in
object/point intersection.*/
SISLIntdat *qintdat = SISL_NULL; /* Pointer to intersection data */
int ksurf=0; /* Dummy number of Intsurfs. */
SISLIntsurf **wsurf=SISL_NULL; /* Dummy array of Intsurfs. */
int kdeg=2000; /* input to int_join_per. */
SISLObject *track_obj=SISL_NULL;
SISLCurve *qkreg=SISL_NULL; /* Input surface ensured k-regularity. */
/* -------------------------------------------------------- */
if (pc1->cuopen == SISL_CRV_PERIODIC)
{
/* Cyclic curve. */
make_cv_kreg(pc1,&qkreg,&kstat);
if (kstat < 0) goto error;
}
else
qkreg = pc1;
/*
* Create new object and connect curve to object.
* ------------------------------------------------
*/
if (!(track_obj = newObject (SISLCURVE)))
goto err101;
track_obj->c1 = pc1;
/*
* Check dimension.
* ----------------
*/
*jpt = 0;
*jcrv = 0;
*jtrack = 0;
if ( !(idim == 2 || idim == 3)) goto err104;
if (qkreg -> idim != idim) goto err103;
/*
* Make a matrix of dimension (idim+1)(idim+1) to describe the circle/sphere
* -------------------------------------------------------------------------
*
*/
s1321(ecentr,aradiu,idim,kdim,sarray,&kstat);
if (kstat<0) goto error;
/*
* Put curve into sphere curve equation
* ------------------------------------
*/
s1370(qkreg,sarray,idim,kdim,0,&qc,&kstat);
if (kstat<0) goto error;
/*
* Create new object and connect curve to object.
* ----------------------------------------------
*/
if (!(qo1 = newObject(SISLCURVE))) goto err101;
qo1 -> c1 = qc;
qo1 -> o1 = qo1;
/*
* Create new object and connect point to object.
* ----------------------------------------------
*/
if (!(qo2 = newObject(SISLPOINT))) goto err101;
spoint[0] = DZERO;
if (!(qp = newPoint(spoint,kdim,1))) goto err101;
qo2 -> p1 = qp;
/*
* Find intersections.
* -------------------
*/
sh1761(qo1,qo2,aepsge,&qintdat,&kstat);
if (kstat < 0) goto error;
/* Join periodic curves */
int_join_per( &qintdat,track_obj,track_obj,nullp,kdeg,aepsge,&kstat);
if (kstat < 0)
goto error;
/* Create tracks */
if (trackflag && qintdat)
{
make_tracks (qo1, qo2, 0, nullp,
qintdat->ilist, qintdat->vlist,
jtrack, wtrack, aepsge, &kstat);
if (kstat < 0)
goto error;
}
/*
* Express intersections on output format.
* ---------------------------------------
*/
if (qintdat)/* Only if there were intersections found */
{
hp_s1880(track_obj, track_obj, kdeg,
1,0,qintdat,jpt,gpar,&spar,pretop,jcrv,wcurve,&ksurf,&wsurf,&kstat);
if (kstat < 0) goto error;
}
/*
* Intersections found.
* --------------------
*/
*jstat = 0;
goto out;
/* Error in space allocation. */
err101: *jstat = -101;
s6err("sh1371",*jstat,kpos);
goto out;
/* Dimensions conflicting. */
err103: *jstat = -103;
s6err("sh1371",*jstat,kpos);
goto out;
/* Dimension not equal to two or three. */
err104: *jstat = -104;
s6err("sh1371",*jstat,kpos);
goto out;
/* Error in lower level routine. */
error : *jstat = kstat;
s6err("sh1371",*jstat,kpos);
goto out;
out:
/* Free allocated space. */
if (spar) freearray(spar);
if (qo1) freeObject(qo1);
if (qo2) freeObject(qo2);
if (qintdat) freeIntdat(qintdat);
if (track_obj)
{
track_obj->c1 = SISL_NULL;
freeObject(track_obj);
}
/* Free local curve. */
if (qkreg != SISL_NULL && qkreg != pc1) freeCurve(qkreg);
return;
}
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