91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
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* related information and legal notices. It is expected that any future
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* projects/authors will amend these files as needed.
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*
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* ---
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*
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* move_sat.c: Move a satellite to the next point in it's orbit.
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*
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* Known contributors to this file:
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*
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*/
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#include <math.h>
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#include "misc.h"
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#include "var.h"
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#include "plane.h"
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#include "sect.h"
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#include "xy.h"
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#include "nsc.h"
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#include "nat.h"
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#include "path.h"
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#include "file.h"
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#include "update.h"
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#include "subs.h"
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#include "optlist.h"
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#ifndef PI
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#define PI 3.14159265358979323846
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#endif
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void
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move_sat(register struct plnstr *pp)
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{
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coord x1, y1, x2, y2;
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coord dx, dy;
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float newtheta;
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struct sctstr sect;
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newtheta = pp->pln_theta + .05;
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if (newtheta >= 1.0) {
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newtheta -= 1.0;
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}
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x1 = (coord)(2 * pp->pln_theta * WORLD_X);
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x1 = xnorm(x1);
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y1 = (coord)(sin(6 * PI * pp->pln_theta) * (WORLD_Y / 4));
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x2 = (coord)(2 * newtheta * WORLD_X);
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x2 = xnorm(x2);
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y2 = (coord)(sin(6 * PI * newtheta) * (WORLD_Y / 4));
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dx = x1 - pp->pln_x;
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dy = y1 - pp->pln_y;
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x2 -= dx;
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y2 -= dy;
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if ((x2 + y2) & 1) {
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x2++;
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}
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pp->pln_x = xnorm(x2);
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pp->pln_y = ynorm(y2);
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pp->pln_theta = newtheta;
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getsect(pp->pln_x, pp->pln_y, §);
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if (sect.sct_own)
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if (pp->pln_own != sect.sct_own)
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wu(0, sect.sct_own, "%s satellite spotted over %s\n",
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cname(pp->pln_own), xyas(pp->pln_x, pp->pln_y,
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sect.sct_own));
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return;
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}
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