/* vector2d * Copyright (C) 1998 Jay Cox * * 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 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; }