gimp/app/vector2d.c

40 lines
1.1 KiB
C
Raw Normal View History

/* vector2d
* Copyright (C) 1998 Jay Cox <jaycox@earthlink.net>
*
* 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.
*/
#include "vector2d.h"
#include <math.h>
double
vector2d_dot_product (vector2d *v1, vector2d *v2)
{
return ((v1->x * v2->x) + (v1->y * v2->y));
}
double
vector2d_magnitude (vector2d *v)
{
return (sqrt((v->x*v->x) + (v->y*v->y)));
}
void
vector2d_set (vector2d *v, double x, double y)
{
v->x = x; v->y = y;
}