2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2004, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
23 * related information and legal notices. It is expected that any future
24 * projects/authors will amend these files as needed.
28 * move_sat.c: Move a satellite to the next point in it's orbit.
30 * Known contributors to this file:
49 #define PI 3.14159265358979323846
53 move_sat(register struct plnstr *pp)
60 newtheta = pp->pln_theta + .05;
62 if (newtheta >= 1.0) {
66 x1 = (coord)(2 * pp->pln_theta * WORLD_X);
68 y1 = (coord)(sin(6 * PI * pp->pln_theta) * (WORLD_Y / 4));
69 x2 = (coord)(2 * newtheta * WORLD_X);
71 y2 = (coord)(sin(6 * PI * newtheta) * (WORLD_Y / 4));
81 pp->pln_x = xnorm(x2);
82 pp->pln_y = ynorm(y2);
83 pp->pln_theta = newtheta;
84 getsect(pp->pln_x, pp->pln_y, §);
86 if (pp->pln_own != sect.sct_own)
87 wu(0, sect.sct_own, "%s satellite spotted over %s\n",
88 cname(pp->pln_own), xyas(pp->pln_x, pp->pln_y,