src/lib/commands/look.c

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/*
 *  Empire - A multi-player, client/server Internet based war game.
 *  Copyright (C) 1986-2007, 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 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
 */

#include <config.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
look(void)
{
    return do_look(EF_SHIP);
}

int
llook(void)
{
    return do_look(EF_LAND);
}

int
do_look(short type)
{
    int i;
    struct nstr_item ni;
    union empobj_storage unit;
    struct sctstr sect;
    int x, y;
    int civ;
    int mil;
    unsigned char *bitmap;
    int changed = 0;

    if (!snxtitem(&ni, type, player->argp[1]))
        return RET_SYN;
    if ((bitmap = malloc((WORLD_X * WORLD_Y) / 8)) == 0) {
        logerror("malloc failed in do_look\n");
        pr("Memory error.  Tell the deity.\n");
        return RET_FAIL;
    }
    memset(bitmap, 0, (WORLD_X * WORLD_Y) / 8);
    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, &sect);
            if (sect.sct_type == SCT_WATER)
                continue;
            if (player->owner)
                pr("Your ");
            else
                pr("%s (#%d) ", cname(sect.sct_own), sect.sct_own);
            pr("%s", dchr[sect.sct_type].d_name);
            changed += map_set(player->cnum, x, y,
                               dchr[sect.sct_type].d_mnem, 0);
            pr(" %d%% efficient ", player->owner ? sect.sct_effic :
               roundintby((int)sect.sct_effic, 10));
            civ = sect.sct_item[I_CIVIL];
            mil = sect.sct_item[I_MILIT];
            if (civ)
                pr("with %s%d civ ",
                   player->owner ? "" : "approx ",
                   player->owner ? civ : roundintby(civ, 10));
            if (mil)
                pr("with %s%d mil ",
                   player->owner ? "" : "approx ",
                   player->owner ? mil : roundintby(mil, 10));
            pr("@ %s\n", xyas(x, y, player->cnum));
            if (opt_HIDDEN) {
                setcont(player->cnum, sect.sct_own, FOUND_LOOK);
            }
        }
    }
    if (changed)
        writemap(player->cnum);
    free(bitmap);
    return RET_OK;
}

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)(sp->shp_visib * range / 30.0);
        else
            vrange = (int)(sp->shp_visib * range / 20.0);
        getsect(sp->shp_x, sp->shp_y, &sect);
        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 (#%d) %s @ %s\n",
           cname(sp->shp_own), 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, lookland->lnd_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)
            continue;
        /* Don't always see spies */
        if (lchr[(int)lp->lnd_type].l_flags & L_SPY) {
            /* If it's on a ship or unit, assume it's hidden
               enough not to be seen */
            if (lp->lnd_ship >= 0 || lp->lnd_land >= 0)
                continue;
            if (!(chance(LND_SPY_DETECT_CHANCE(lp->lnd_effic))))
                continue;
        }
        vrange = ldround((lp->lnd_vis * range) / 20.0, 1);
        dist = mapdist(lp->lnd_x, lp->lnd_y,
                       lookland->lnd_x, lookland->lnd_y);
        if (dist > vrange)
            continue;

        pr("%s (#%d) %s (approx %d mil) @ %s\n",
           cname(lp->lnd_own), 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)
            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 (#%d) %s @ %s\n",
           cname(pp->pln_own), 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);
    }
}

---