156 lines
4 KiB
C
156 lines
4 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire 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 3 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, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* skyw.c: Look at satellites in the sky.
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*
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* Known contributors to this file:
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* Ken Stevens, 1995
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* Markus Armbruster, 2010
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*/
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#include <config.h>
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#include "commands.h"
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#include "optlist.h"
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#include "plane.h"
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#define TSIZE 200
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struct sky {
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struct sky *s_next;
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int s_spotted;
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struct plnstr s_sat;
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};
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static int showsat(struct sky **skypp, int x, int y);
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/*
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* format: skywatch [<SECTS>]
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*/
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int
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skyw(void)
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{
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struct sctstr sect;
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struct nstr_sect nstr;
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struct sky *skyp;
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struct sky *list[TSIZE];
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int i, n;
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int vrange, see;
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int x, y, dx, dy, dxmax;
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int nsat = 0;
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double tech;
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struct nstr_item ni;
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if (!snxtsct(&nstr, player->argp[1]))
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return RET_SYN;
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for (i = 0; i < TSIZE; i++)
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list[i] = NULL;
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skyp = malloc(sizeof(*skyp));
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snxtitem_all(&ni, EF_PLANE);
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while (nxtitem(&ni, &skyp->s_sat)) {
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if (!skyp->s_sat.pln_own)
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continue;
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if (!pln_is_in_orbit(&skyp->s_sat))
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continue;
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getsect(skyp->s_sat.pln_x, skyp->s_sat.pln_y, §);
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n = scthash(skyp->s_sat.pln_x, skyp->s_sat.pln_y, TSIZE);
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skyp->s_spotted = 0;
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skyp->s_next = list[n];
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list[n] = skyp;
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skyp = malloc(sizeof(*skyp));
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nsat++;
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}
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/* get that last one! */
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free(skyp);
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pr("- = [ Skywatch report for %s ] = -\n", cname(player->cnum));
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pr(" Country Satellite Location\n");
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tech = tfact(player->cnum, 1.0);
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while (nxtsct(&nstr, §) && nsat) {
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if (sect.sct_own != player->cnum)
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continue;
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see = sect.sct_type == SCT_RADAR ? 14 : 4;
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vrange = (int)(sect.sct_effic / 100.0 * see * tech);
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if (vrange < 1)
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vrange = 1;
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for (dy = -vrange; dy <= vrange; dy++) {
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y = ynorm(sect.sct_y + dy);
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dxmax = 2 * vrange - abs(dy);
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for (dx = -dxmax; dx <= dxmax; dx += 2) {
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x = xnorm(sect.sct_x + dx);
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n = scthash(x, y, TSIZE);
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if (!list[n])
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continue;
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nsat -= showsat(&list[n], x, y);
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}
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}
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}
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/* free up the sky structs calloc'ed above */
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for (i = 0; i < TSIZE; i++) {
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while (NULL != (skyp = list[i])) {
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list[i] = skyp->s_next;
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free(skyp);
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}
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}
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return RET_OK;
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}
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static int
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showsat(struct sky **skypp, int x, int y)
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{
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struct sky *skyp;
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struct sky *todelete = NULL;
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struct sky **prev;
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int nsat = 0;
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prev = NULL;
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skyp = *skypp;
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prev = skypp;
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do {
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/* we delete it, we free it. */
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if (todelete) {
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free(todelete);
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todelete = NULL;
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}
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if (skyp->s_sat.pln_x != x || skyp->s_sat.pln_y != y) {
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prev = &(*prev)->s_next;
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continue;
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}
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pr(" %12.12s (#%3d) %s @ %s\n",
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cname(skyp->s_sat.pln_own), skyp->s_sat.pln_own,
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prplane(&skyp->s_sat), xyas(x, y, player->cnum));
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if (opt_HIDDEN) {
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/* FOUND_COAST should probably be changed to FOUND_SKY -KHS */
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setcont(player->cnum, skyp->s_sat.pln_own, FOUND_COAST);
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}
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*prev = skyp->s_next;
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todelete = skyp;
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nsat++;
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} while (NULL != (skyp = skyp->s_next));
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/* check that last one! */
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if (todelete)
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free(todelete);
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return nsat;
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}
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