//===========================================================================
// Copyright (C) 1998, 2000-2007, 2010, 2011, 2012 SINTEF ICT, Applied
// Mathematics, Norway.
//
// This file is part of GoTools
//
// This program is free software; you can redistribute it and/or          
// modify it under the terms of the GNU General Public License            
// as published by the Free Software Foundation version 2 of the License. 
//
// This program 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 General Public License for more details.                           
//
// You should have received a copy of the GNU General Public License      
// along with this program; if not, see <http://www.gnu.org/licenses>
//
// Contact information: E-mail: tor.dokken@sintef.no                      
// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
//
// Other licenses are also available for this software, notably licenses
// for:
// - Building commercial software.                                        
// - Building software whose source code you wish to keep private.        
//===========================================================================

#include "sisl-copyright.h"

/*
 *
 * $Id: s1438.c,v 1.3 2005-02-28 09:04:48 afr Exp $
 *
 */


#define S1438

#include "sislP.h"

#if defined(SISLNEEDPROTOTYPES)
void 
s1438(SISLCurve  *pc,int iedge,SISLPoint **rpedge,double *cpar,int *jstat)
#else
void s1438(pc,iedge,rpedge,cpar,jstat)
     SISLCurve  *pc;
     int    iedge;
     SISLPoint  **rpedge;
     double *cpar;
     int    *jstat;
#endif
/*
*********************************************************************
*
*********************************************************************
*                                                                   
* PURPOSE    : Pick given edge-point of B-spline curve.
*
*
*
* INPUT      : pc     - Pointer to curve.
*              iedge  - Number of point. See figure below.
*
*                           
*                    iedge=0-----------------iedge=1
*
*
*
* OUTPUT     : rpedge - SISLEdge point.
*              cpar   - Parameter value of edge.
*              jstat  - status messages  
*                                         > 0      : warning
*                                         = 0      : ok
*                                         < 0      : error
*
*
* METHOD     :
*
*
* REFERENCES :
*
*-
* CALLS      :
*
* WRITTEN BY : Arne Laksaa, SI, 05.89.
*
*********************************************************************
*/                                     
{
  int kpos = 0;         /* Position of error.                             */
  
  if (iedge == 0)
    {
      *cpar = pc->et[pc->ik - 1];
      
      if (((*rpedge) = newPoint(pc->ecoef,pc->idim,1)) == SISL_NULL)
	goto err101;
    }
  else if (iedge == 1)
    {
      *cpar = pc->et[pc->in];
      
      if (((*rpedge)=newPoint(pc->ecoef+pc->idim*(pc->in-1),pc->idim,1))==SISL_NULL)
	goto err101;
    }
  else goto err141;
  
  /* SISLPoint picked.  */
  
  *jstat = 0;
  goto out;
  
  
  /* Error in space allocation.  */
  
 err101: *jstat = -101;
  s6err("s1438",*jstat,kpos);
  goto out;
  
  /* Error in number of edges.  */
  
  err141 : *jstat = -141;
  s6err("s1438",*jstat,kpos);
  goto out;
  
 out: ;
}
