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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: sh1463.c,v 1.2 2001-03-19 15:59:04 afr Exp $
*
*/
#define SH1463
#include "sislP.h"
#if defined(SISLNEEDPROTOTYPES)
typedef void (*fshapeProc)(double [],double [],int,int,int *);
#else
typedef void (*fshapeProc)();
#endif
#if defined(SISLNEEDPROTOTYPES)
void
sh1463(fshapeProc fshape,
SISLCurve *vboundc[],int icurv,double etwist[],
double etang[],double eder[],int *jstat)
#else
void sh1463(fshape,vboundc,icurv,etwist,etang,eder,jstat)
fshapeProc fshape;
double etwist[],etang[],eder[];
SISLCurve *vboundc[];
int icurv,*jstat;
#endif
/*
*********************************************************************
*
* PURPOSE : Given a four sided vertex region, evaluate the first
* blending surface in the corner lying in the middle of the
* vertex region. Compute the tangent vectors in the middle
* vertex along the inner boundaries of the region.
*
*
*
* INPUT : fshape - Application driven routine that gives the user an
* ability to change the middle point of the region
* (the vertex at which the blending surfaces meet),
* and the tangent vectors in the middle point along
* the curves which divedes the region.
* vboundc - Position and cross-tangent curves around the vertex
* region. For each edge of the region position and cross-
* tangent curves are given. The curves follow each other
* around the region and are oriented counter-clock-wise.
* The dimension of the array is 8.
* icurv - Number of sides. icurv = 4.
* etwist - Twist-vectors of the corners of the vertex region. The
* first element of the array is the twist in the corner
* before the first edge, etc. The dimension of the array
* is 4*kdim.
*
*
* OUTPUT : etang - Tangent vectors at the midpoint of the vertex region.
* The dimension is icurv*idim.
* eder - Value, first and second derivative of the first blending
* surface in the corner at the midpoint. The sequence is the
* following : Value, 1. derivative in 1. parameter direction,
* 1. derivative in the 2. parameter direction, 2. derivative
* in the 1. parameter direction, mixed derivative and 2.
* derivative in the 2. parameter direction. Dimension 6*idim.
* jstat - status messages
* > 0 : warning
* = 0 : ok
* < 0 : error
*
*
* METHOD : Perform rectangular blending of the whole region. Evaluate
* the resulting surface in the midpoint.
*
* REFERENCES :
*
* USE : 3D geometry only.
*
*-
* CALLS : s1401 - Rectangular blending.
* s1421 - Surface evaluation.
* s1706 - Turn orientation of curve.
* freeCurve - Free space occupied by a curve.
* newCurve - Create new curve.
*
* WRITTEN BY : Vibeke Skytt, SI, 05.90.
*
*********************************************************************
*/
{
int kstat = 0; /* Status variable. */
int kder = 2; /* Number of derivatives of surface to evaluate. */
int ki; /* Counters. */
int kdim = 3; /* Dimension of geometry space. */
int klfs = 0; /* Parameter used in surface evaluation. */
int klft = 0; /* Parameter used in surface evaluation. */
double spar[2]; /* Parameter value of midpoint of rectanular patch. */
double sder[18]; /* Value and derivatives of patch in the midpoint. */
double snorm[3]; /* Normal of patch in the midpoint. */
SISLSurf *qsurf = SISL_NULL; /* Rectangular blending patch. */
SISLCurve *qc[8]; /* Copy of edge curves. */
SISLCurve *qpt; /* Pointer to curve. */
/* Make a copy of the edge curves. */
for (ki=0; ki<8; ki++)
{
qpt = vboundc[ki];
/* Test dimension of curves. */
if (qpt->idim != kdim) goto err104;
qc[ki] = newCurve(qpt->in,qpt->ik,qpt->et,qpt->ecoef,qpt->ikind,kdim,1);
if (qc[ki] == SISL_NULL) goto err101;
}
/* Turn the orientation of the curves at the 3. and 4. edge. */
s1706(qc[4]);
s1706(qc[5]);
s1706(qc[6]);
s1706(qc[7]);
/* Compute Coon's patch. */
s1401(qc,etwist,&qsurf,&kstat);
if (kstat < 0) goto error;
/* Evaluate the surface in the middle. */
spar[0] = (double)0.5*(*(qsurf->et1+qsurf->ik1-1) + *(qsurf->et1+qsurf->in1));
spar[1] = (double)0.5*(*(qsurf->et2+qsurf->ik2-1) + *(qsurf->et2+qsurf->in2));
s1421(qsurf,kder,spar,&klfs,&klft,sder,snorm,&kstat);
if (kstat < 0) goto error;
/* Compute tangent vectors at the midpoint of the vertex region as
half the tangent vectors at the rectangular patch. */
for (ki=0; ki<kdim; ki++)
{
etang[ki] = (double)0.5*sder[2*kdim+ki];
etang[kdim+ki] = (double)0.5*sder[kdim+ki];
etang[2*kdim+ki] = -(double)0.5*sder[2*kdim+ki];
etang[3*kdim+ki] = -(double)0.5*sder[kdim+ki];
}
/* Application driven routine to alter the midpoint and tangents in the
midpoint. */
fshape(sder,etang,kdim,icurv,&kstat);
if (kstat < 0) goto error;
/* Copy value and 1. derivatives of first patch. */
memcopy(eder,sder,kdim,DOUBLE);
memcopy(eder+kdim,etang+3*kdim,kdim,DOUBLE);
memcopy(eder+2*kdim,etang,kdim,DOUBLE);
/* Compute 2. derivatives. */
for (ki=0; ki<kdim; ki++)
{
eder[3*kdim+ki] = (double)0.1*sder[5*kdim+ki];
eder[4*kdim+ki] = (double)0.1*sder[4*kdim+ki];
eder[5*kdim+ki] = (double)0.1*sder[3*kdim+ki];
}
*jstat = 0;
goto out;
/* Error in scratch allocation. */
err101 :
*jstat = -101;
goto out;
/* Error in input. Dimension not equal to 3. */
err104 :
*jstat = -104;
goto out;
/* Error in a lower level function. */
error:
*jstat = kstat;
goto out;
out :
/* Free space occupied by local curves and surface. */
for (ki=0; ki<8; ki++)
if (qc[ki] != SISL_NULL) freeCurve(qc[ki]);
if (qsurf != SISL_NULL) freeSurf(qsurf);
return;
}
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