m_circle.c

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/* gEDA - GPL Electronic Design Automation
 * libgeda - gEDA's library
 * Copyright (C) 1998-2010 Ales Hvezda
 * Copyright (C) 1998-2010 gEDA Contributors (see ChangeLog for details)
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <config.h>
#include <math.h>
#include <stdio.h>

#include "libgeda_priv.h"

#ifdef HAVE_LIBDMALLOC
#include <dmalloc.h>
#endif


double m_circle_shortest_distance (CIRCLE *circle, int x, int y, int solid)
{
  double shortest_distance;
  double distance_to_center;
  double dx, dy;

  g_return_val_if_fail (circle != NULL, G_MAXDOUBLE);

  dx = ((double)x) - ((double)circle->center_x);
  dy = ((double)y) - ((double)circle->center_y);

  distance_to_center = sqrt ((dx * dx) + (dy * dy));

  if (solid) {
    shortest_distance = max (distance_to_center - circle->radius, 0);
  } else {
    shortest_distance = fabs (distance_to_center - circle->radius);
  }

  return shortest_distance;
}