Function howmonseen

src/vision.c:2151–2186

bitmask indicating ways mon is seen; extracted from lookat(pager.c) */

/* bitmask indicating ways mon is seen; extracted from lookat(pager.c) */
unsigned
howmonseen(struct monst *mon)
{
    boolean useemon = (boolean) canseemon(mon);
    int xraydist = (u.xray_range < 0) ? -1 : (u.xray_range * u.xray_range);
    unsigned how_seen = 0; /* result */

    /* assert(mon != NULL) */
    /* normal vision;
       cansee is true for both normal and astral vision,
       but couldsee it not true for astral vision */
    if ((mon->wormno ? worm_known(mon) : (cansee(mon->mx, mon->my)
                                          && couldsee(mon->mx, mon->my)))
        && mon_visible(mon) && !mon->minvis)
        how_seen |= MONSEEN_NORMAL;
    /* see invisible */
    if (useemon && mon->minvis)
        how_seen |= MONSEEN_SEEINVIS;
    /* infravision */
    if ((!mon->minvis || See_invisible) && see_with_infrared(mon))
        how_seen |= MONSEEN_INFRAVIS;
    /* telepathy */
    if (tp_sensemon(mon))
        how_seen |= MONSEEN_TELEPAT;
    /* xray */
    if (useemon && xraydist > 0 && mdistu(mon) <= xraydist)
        how_seen |= MONSEEN_XRAYVIS;
    /* extended detection */
    if (Detect_monsters)
        how_seen |= MONSEEN_DETECT;
    /* class-/type-specific warning */
    if (MATCH_WARN_OF_MON(mon))
        how_seen |= MONSEEN_WARNMON;

    return how_seen;
}

/*vision.c*/