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howmonseen - monster visibility (trunk only)

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Pull some code out of lookat() so that it can be used elsewhere.
howmonseen(mon) returns a bitmask of the ways that hero can see mon.
This commit is contained in:
nethack.rankin
2007-05-12 01:30:00 +00:00
parent b805ba7bc3
commit 24f3e005f1
4 changed files with 103 additions and 79 deletions
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40
src/vision.c
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@@ -1,4 +1,4 @@
/* SCCS Id: @(#)vision.c 3.5 2005/06/15 */
/* SCCS Id: @(#)vision.c 3.5 2007/05/11 */
/* Copyright (c) Dean Luick, with acknowledgements to Dave Cohrs, 1990. */
/* NetHack may be freely redistributed. See license for details. */
@@ -2625,4 +2625,42 @@ do_clear_area(scol,srow,range,func,arg)
}
}
/* bitmask indicating ways mon is seen; extracted from lookat(pager.c) */
unsigned
howmonseen(mon)
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 */
/* 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 && distu(mon->mx, mon->my) <= 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*/