2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2021, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * move_sat.c: Move a satellite to the next point in it's orbit.
29 * Known contributors to this file:
40 #include "prototypes.h"
45 #define PI 3.14159265358979323846
49 move_sat(struct plnstr *pp)
56 newtheta = pp->pln_theta + .05;
58 if (newtheta >= 1.0) {
62 x1 = (coord)(2 * pp->pln_theta * WORLD_X);
64 y1 = (coord)(sin(6 * PI * pp->pln_theta) * (WORLD_Y / 4));
65 x2 = (coord)(2 * newtheta * WORLD_X);
67 y2 = (coord)(sin(6 * PI * newtheta) * (WORLD_Y / 4));
77 pp->pln_x = xnorm(x2);
78 pp->pln_y = ynorm(y2);
79 pp->pln_theta = newtheta;
80 getsect(pp->pln_x, pp->pln_y, §);
82 if (pp->pln_own != sect.sct_own)
83 wu(0, sect.sct_own, "%s satellite spotted over %s\n",
84 cname(pp->pln_own), xyas(pp->pln_x, pp->pln_y,