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/*
* coords.c
*
*
* Authors:
* Richard Hult <rhult@hem.passagen.se>
* Ricardo Markiewicz <rmarkie@fi.uba.ar>
* Andres de Barbara <adebarbara@fi.uba.ar>
* Marc Lorber <lorber.marc@wanadoo.fr>
* Bernhard Schuster <bernhard@ahoi.io>
*
* Web page: https://ahoi.io/project/oregano
*
* Copyright (C) 1999-2001 Richard Hult
* Copyright (C) 2003,2004 Ricardo Markiewicz
* Copyright (C) 2009-2012 Marc Lorber
* Copyright (C) 2012-2013 Bernhard Schuster
*
* 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.
*/
#ifndef __COORDS_H
#define __COORDS_H
#define COORDS_DELTA (1e-5)
#include <glib.h>
#include <math.h>
typedef struct _Coords
{
gdouble x;
gdouble y;
} Coords;
Coords *coords_new (gdouble x, gdouble y);
Coords *coords_new_copy (const Coords *c);
void coords_destroy (Coords *c);
/*
* Adds b to a and returns a pointer to a which holds now the result
*/
Coords *coords_add (Coords *a, const Coords *b);
/*
* Adds b to a and returns a ptr to a Coord struct which has to be freed by
* either coords_destroy
*/
Coords *coords_sum_new (const Coords *a, const Coords *b);
Coords *coords_set (Coords *a, const Coords *val);
/*
*
*/
Coords coords_sum (const Coords *a, const Coords *b);
Coords coords_sub (const Coords *a, const Coords *b);
/*
* calculates the average of two points
*/
Coords coords_average (const Coords *a, const Coords *b);
gdouble coords_cross (const Coords *a, const Coords *b);
gdouble coords_dot (const Coords *a, const Coords *b);
gdouble coords_euclid (const Coords *a);
gdouble coords_euclid2 (const Coords *a);
gdouble coords_distance (const Coords *a, const Coords *b);
gboolean coords_equal (const Coords *a, const Coords *b);
/*
* used for GHashTable key hashing
*/
guint coords_hash (gconstpointer v);
/*
* used for comparsion in GHashTable
*/
gint coords_compare (const Coords *a, const Coords *b);
#endif /* __COORDS_H */
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