/***********************************************************************
 * link.h : Definition of the link. A link is a pair of stars and 
 *         facilities to access extra information.
 ***********************************************************************/

/***********************************************************************
 *  This file is part of SpaceChart.
 *  Copyright (C) 1999 Miguel Coca <e970095@zipi.fi.upm.es>
 *
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 ***********************************************************************/

#ifndef _INCLUDE_LINK_H_
#define _INCLUDE_LINK_H_

#include "starmap.h"
#include "star.h"

typedef struct st_link link_t;

link_t *link_new( star_t *a, star_t *b );

void link_get_stars( link_t* link, star_t **a, star_t **b );

double link_get_distance( link_t* link );

void link_get_middle( link_t* link, coords_3d_t *middle );

void link_destroy( link_t* link );

#endif