/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2021, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure, Markus Armbruster
*
* Empire 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 3 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, see .
*
* ---
*
* See files README, COPYING and CREDITS in the root of the source
* tree for related information and legal notices. It is expected
* that future projects/authors will amend these files as needed.
*
* ---
*
* look.c: Lookout from a ship or land unit
*
* Known contributors to this file:
* Ron Koenderink, 2006-2007
* Markus Armbruster, 2004-2016
*/
#include
#include "chance.h"
#include "commands.h"
#include "empobj.h"
#include "map.h"
#include "optlist.h"
#include "path.h"
static void look_ship(struct shpstr *lookship);
static void look_land(struct lndstr *lookland);
int
c_lookout(void)
{
return do_look(EF_SHIP);
}
int
c_llookout(void)
{
return do_look(EF_LAND);
}
int
do_look(int type)
{
int i;
struct nstr_item ni;
union empobj_storage unit;
struct sctstr sect;
int x, y;
unsigned char *bitmap;
int changed = 0;
if (CANT_HAPPEN(type != EF_LAND && type != EF_SHIP))
type = EF_SHIP;
if (!snxtitem(&ni, type, player->argp[1], NULL))
return RET_SYN;
bitmap = calloc((WORLD_SZ() + 7) / 8, 1);
if (!bitmap) {
logerror("malloc failed in do_look\n");
pr("Memory error. Tell the deity.\n");
return RET_FAIL;
}
while (nxtitem(&ni, &unit)) {
if (!player->owner)
continue;
if (type == EF_LAND) {
if (unit.land.lnd_ship >= 0)
continue;
if (unit.land.lnd_land >= 0)
continue;
/* Spies don't need military to do a "llook". Other
units do */
if ((unit.land.lnd_item[I_MILIT] <= 0) &&
!(lchr[(int)unit.land.lnd_type].l_flags & L_SPY))
continue;
look_land(&unit.land);
} else
look_ship(&unit.ship);
for (i = 0; i <= 6; i++) {
x = diroff[i][0] + unit.gen.x;
y = diroff[i][1] + unit.gen.y;
if (emp_getbit(x, y, bitmap))
continue;
emp_setbit(x, y, bitmap);
getsect(x, y, §);
if (sect.sct_type == SCT_WATER)
continue;
look_at_sect(§, 10);
changed += map_set(player->cnum, x, y,
dchr[sect.sct_type].d_mnem, 0);
if (opt_HIDDEN) {
setcont(player->cnum, sect.sct_own, FOUND_LOOK);
}
}
}
if (changed)
writemap(player->cnum);
free(bitmap);
return RET_OK;
}
void look_at_sect(struct sctstr *sp, int mult)
{
int civ, mil;
int ours = player->god || sp->sct_own == player->cnum;
pr("%s %s",
sp->sct_own == player->cnum ? "Your" : prnatid(sp->sct_own),
dchr[sp->sct_type].d_name);
pr(" %d%% efficient ",
ours ? sp->sct_effic : roundintby(sp->sct_effic, mult));
civ = sp->sct_item[I_CIVIL];
mil = sp->sct_item[I_MILIT];
if (civ)
pr("with %s%d civ ",
ours ? "" : "approx ",
ours ? civ : roundintby(civ, mult));
if (mil)
pr("with %s%d mil ",
ours ? "" : "approx ",
ours ? mil : roundintby(mil, mult));
pr("@ %s\n", xyas(sp->sct_x, sp->sct_y, player->cnum));
}
static void
look_ship(struct shpstr *lookship)
{
struct shpstr *sp;
struct mchrstr *smcp;
struct mchrstr *tmcp;
struct sctstr sect;
int range;
int vrange;
int i;
int dist;
range = (int)techfact(lookship->shp_tech,
mchr[(int)lookship->shp_type].m_vrnge);
range = range * (lookship->shp_effic / 100.0);
smcp = &mchr[(int)lookship->shp_type];
if (smcp->m_flags & M_SUB)
range = MIN(range, 1);
for (i = 0; NULL != (sp = getshipp(i)); i++) {
if (sp->shp_own == player->cnum || sp->shp_own == 0)
continue;
dist = mapdist(sp->shp_x, sp->shp_y,
lookship->shp_x, lookship->shp_y);
if (dist > ship_max_interdiction_range)
continue;
tmcp = &mchr[(int)sp->shp_type];
if (smcp->m_flags & M_SUB)
vrange = (int)(shp_visib(sp) * range / 30.0);
else
vrange = (int)(shp_visib(sp) * range / 20.0);
getsect(sp->shp_x, sp->shp_y, §);
if (sect.sct_type != SCT_WATER)
vrange = MAX(1, vrange);
if (dist > vrange)
continue;
if (smcp->m_flags & M_SUB) {
if (tmcp->m_flags & M_SONAR && dist < 2) {
if (sp->shp_own != 0)
wu(0, sp->shp_own,
"%s detected surfacing noises in %s.\n",
prship(sp),
xyas(lookship->shp_x, lookship->shp_y,
sp->shp_own));
}
if (dist == 0 && (tmcp->m_flags & M_SUB) == 0)
if (sp->shp_own != 0)
wu(0, sp->shp_own,
"Periscope spotted in %s by %s\n",
xyas(lookship->shp_x, lookship->shp_y,
sp->shp_own), prship(sp));
}
/* subs at sea only seen by sonar */
if (tmcp->m_flags & M_SUB && sect.sct_type == SCT_WATER)
continue;
pr("%s %s @ %s\n",
prnatid(sp->shp_own), prship(sp),
xyas(sp->shp_x, sp->shp_y, player->cnum));
if (opt_HIDDEN)
setcont(player->cnum, sp->shp_own, FOUND_LOOK);
}
}
static void
look_land(struct lndstr *lookland)
{
struct plnstr *pp;
struct lndstr *lp;
double drange;
int range;
int vrange;
int i;
int dist;
drange = techfact(lookland->lnd_tech, lchr[lookland->lnd_type].l_spy);
drange *= lookland->lnd_effic / 100.0;
range = ldround(drange, 1);
if (range == 0)
return;
for (i = 0; NULL != (lp = getlandp(i)); i++) {
if (lp->lnd_own == player->cnum || lp->lnd_own == 0)
continue;
if (lp->lnd_ship >= 0 || lp->lnd_land >= 0)
continue;
/* Don't always see spies */
if (lchr[(int)lp->lnd_type].l_flags & L_SPY) {
if (!(chance(LND_SPY_DETECT_CHANCE(lp->lnd_effic))))
continue;
}
vrange = ldround((lnd_vis(lp) * range) / 20.0, 1);
dist = mapdist(lp->lnd_x, lp->lnd_y,
lookland->lnd_x, lookland->lnd_y);
if (dist > vrange)
continue;
pr("%s %s (approx %d mil) @ %s\n",
prnatid(lp->lnd_own), prland(lp),
roundintby(lp->lnd_item[I_MILIT], 20),
xyas(lp->lnd_x, lp->lnd_y, player->cnum));
if (opt_HIDDEN)
setcont(player->cnum, lp->lnd_own, FOUND_LOOK);
}
for (i = 0; NULL != (pp = getplanep(i)); i++) {
if (pp->pln_own == player->cnum || pp->pln_own == 0)
continue;
if (pp->pln_ship >= 0 || pp->pln_land >= 0)
continue;
if (pp->pln_flags & PLN_LAUNCHED)
continue;
vrange = ldround((10 * range) / 20.0, 1);
dist = mapdist(pp->pln_x, pp->pln_y,
lookland->lnd_x, lookland->lnd_y);
if (dist > vrange)
continue;
pr("%s %s @ %s\n",
prnatid(pp->pln_own), prplane(pp),
xyas(pp->pln_x, pp->pln_y, player->cnum));
if (opt_HIDDEN)
setcont(player->cnum, pp->pln_own, FOUND_LOOK);
}
}