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Import of Empire 4.2.12

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Markus Armbruster 2003-08-23 12:23:04 +00:00
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src/lib/update/move_sat.c Normal file
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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* 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
*
* ---
*
* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
* related information and legal notices. It is expected that any future
* projects/authors will amend these files as needed.
*
* ---
*
* move_sat.c: Move a satellite to the next point in it's orbit.
*
* Known contributors to this file:
*
*/
#include <math.h>
#include "misc.h"
#include "var.h"
#include "plane.h"
#include "sect.h"
#include "xy.h"
#include "nsc.h"
#include "nat.h"
#include "path.h"
#include "deity.h"
#include "file.h"
#include "update.h"
#include "subs.h"
#include "optlist.h"
#ifndef PI
#define PI 3.14159265358979323846
#endif
void
move_sat(register struct plnstr *pp)
{
coord x1,y1,x2,y2;
coord dx,dy;
float newtheta;
struct sctstr sect;
newtheta = pp->pln_theta + .05;
if (newtheta >= 1.0)
{
newtheta -= 1.0;
}
x1 = (coord)(2 * pp->pln_theta * WORLD_X);
x1 = xnorm(x1);
y1 = (coord)(sin(6 * PI * pp->pln_theta) * (WORLD_Y / 4));
x2 = (coord)(2 * newtheta * WORLD_X);
x2 = xnorm(x2);
y2 = (coord)(sin(6 * PI * newtheta) * (WORLD_Y / 4));
dx = x1 - pp->pln_x;
dy = y1 - pp->pln_y;
x2 -= dx;
y2 -= dy;
if ((x2 + y2) & 1)
{
x2++;
}
pp->pln_x = xnorm(x2);
pp->pln_y = ynorm(y2);
pp->pln_theta = newtheta;
getsect(pp->pln_x, pp->pln_y, &sect);
if (sect.sct_own)
if (pp->pln_own != sect.sct_own)
wu(0, sect.sct_own, "%s satellite spotted over %s\n",
cname(pp->pln_own), xyas(pp->pln_x, pp->pln_y, sect.sct_own));
return;
}