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chase.c
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/*
chase.c - Code for one object to chase another
UltraRogue
Copyright (C) 1984, 1985, 1986, 1987, 1990, 1991 Herb Chong
All rights reserved.
Based on "Advanced Rogue"
Copyright (C) 1983, 1984 Michael Morgan, Ken Dalka and AT&T
All rights reserved.
Based on "Super-Rogue"
Copyright (C) 1982, 1983 Robert D. Kindelberger
All rights reserved.
Based on "Rogue: Exploring the Dungeons of Doom"
Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
All rights reserved.
See the file LICENSE.TXT for full copyright and licensing information.
*/
#include <ctype.h>
#include <stdlib.h>
#include "rogue.h"
#define MAXINT 32767
#define MININT -32767
/* Movement penalties */
#define SHOTPENALTY 2 /* In line of sight of missile */
#define DOORPENALTY 1 /* Moving out of current room */
void
do_chase(struct thing **th_p, bool flee)
{
struct thing *th = *th_p;
struct room *rer, *ree; /* room of chaser, room of
* chasee */
struct room *old_room, /* old room of monster */
*new_room; /* new room of monster */
int mindist = MAXINT, maxdist = MININT, dist = MININT,
last_door = -1; /* Door we just came
* from */
int i;
bool stoprun = FALSE, /* TRUE means we are there */
rundoor; /* TRUE means run to a door */
struct linked_list *item;
coord this; /* Temporary destination for chaser */
bool hit_bad, /* TRUE means hit bad monster */
mon_attack; /* TRUE means find a monster to hit */
char sch;
if (!is_monster(th)) {
msg("Workaround dead monster bug");
return;
}
if (th->t_ischasing == TRUE && th->t_chasee != &player &&
!is_monster(th->t_chasee)) {
th->t_ischasing = FALSE;
msg("Workaround dead chasee bug");
return;
}
if (!th->t_ischasing)
return;
/* Make sure the monster can move */
if (th->t_no_move != 0) {
th->t_no_move--;
return;
}
/*
* Bad monsters check for a good monster to hit, friendly monsters
* check for a bad monster to hit.
*/
mon_attack = FALSE;
if (good_monster(*th)) {
hit_bad = TRUE;
mon_attack = TRUE;
}
else if (on(*th, ISMEAN)) {
hit_bad = FALSE;
mon_attack = TRUE;
}
if (mon_attack) {
struct linked_list *mon_to_hit;
if ((mon_to_hit = f_mons_a(th->t_pos.y, th->t_pos.x, hit_bad))) {
mon_mon_attack(th, mon_to_hit, pick_weap(th), NOTHROWN);
return;
}
}
rer = roomin(&th->t_pos); /* Find room of chaser */
ree = roomin(&th->t_chasee->t_pos); /* Find room of chasee */
/*
* We don't count doors as inside rooms for this routine
*/
if (mvwinch(stdscr, th->t_pos.y, th->t_pos.x) == DOOR)
rer = NULL;
this = th->t_chasee->t_pos;
/*
* If we are not in a corridor and not a phasing monster, then if we
* are running after the player, we run to a door if he is not in the
* same room. If we are fleeing, we run to a door if he IS in the
* same room. Note: We don't bother with doors in mazes.
*/
if (levtype != MAZELEV && rer != NULL && off(*th, CANINWALL)) {
if (flee)
rundoor = (rer == ree);
else
rundoor = (rer != ree);
}
else
rundoor = FALSE;
if (rundoor) {
coord exit; /* A particular door */
int exity, exitx; /* Door's coordinates */
if (th->t_doorgoal != -1) { /* Do we already have the
* goal? */
this = rer->r_exit[th->t_doorgoal];
dist = 0; /* Indicate that we have our door */
}
else
for (i = 0; i < rer->r_nexits; i++) { /* Loop through doors */
exit = rer->r_exit[i];
exity = exit.y;
exitx = exit.x;
/* Avoid secret doors */
if (mvwinch(stdscr, exity, exitx) == DOOR) {
/* Were we just on this door? */
if (ce(exit, th->t_oldpos))
last_door = i;
else {
dist = DISTANCE(th->t_chasee->t_pos.y, th->t_chasee->t_pos.x, exity, exitx);
/*
* If fleeing, we want to
* maximize distance from
* door to what we flee, and
* minimize distance from
* door to us.
*/
if (flee)
dist -= DISTANCE(th->t_pos.y, th->t_pos.x, exity, exitx);
/*
* Maximize distance if
* fleeing, otherwise
* minimize it
*/
if ((flee && (dist > maxdist)) ||
(!flee && (dist < mindist))) {
th->t_doorgoal = i; /* Use this door */
this = exit;
mindist = maxdist = dist;
}
}
}
}
/* Could we not find a door? */
if (dist == MININT) {
/* If we were on a door, go ahead and use it */
if (last_door != -1) {
th->t_doorgoal = last_door;
this = th->t_oldpos;
dist = 0; /* Indicate that we found a
* door */
}
}
/* Indicate that we do not want to flee from the door */
if (dist != MININT)
flee = FALSE;
}
else
th->t_doorgoal = -1; /* Not going to any door */
/*
* this now contains what we want to run to this time so we run to
* it. If we hit it we either want to fight it or stop running
*/
if (!chase(th, &this, flee) && curr_mons) {
if (ce(th->t_nxtpos, hero)) {
/* merchants try to sell something */
if (on(*th, CANSELL)) {
sell(th);
return;
}
else if (off(*th, ISFRIENDLY) && off(*th, ISCHARMED)
&& (off(*th, CANFLY) || (on(*th, CANFLY) && rnd(2))))
attack(th, pick_weap(th), FALSE);
return;
}
else if (on(*th, NOMOVE))
stoprun = TRUE;
}
if (!curr_mons)
return; /* Did monster get itself killed? */
if (on(*th, NOMOVE))
return;
/* If we have a scavenger, it can pick something up */
if ((item = find_obj(th->t_nxtpos.y, th->t_nxtpos.x, TRUE)) != NULL) {
struct object *obj = OBJPTR(item);
if (on(*th, ISSCAVENGE) ||
((on(*th, CANWIELD) || on(*th, CANSHOOT))
&& (obj->o_type == WEAPON || obj->o_type == ARMOR))
|| (on(*th, CANCAST) && is_magic(obj))) {
rem_obj(item, FALSE);
attach(th->t_pack, item);
}
}
mvwaddch(cw, th->t_pos.y, th->t_pos.x, th->t_oldch);
sch = mvwinch(cw, th->t_nxtpos.y, th->t_nxtpos.x);
/* Get old and new room of monster */
old_room = roomin(&th->t_pos);
new_room = roomin(&th->t_nxtpos);
/* If the monster can illuminate rooms, check for a change */
if (on(*th, HASFIRE)) {
/* Is monster entering a room? */
if (old_room != new_room && new_room != NULL) {
new_room->r_flags |= HASFIRE;
new_room->r_fires++;
if (cansee(th->t_nxtpos.y, th->t_nxtpos.x) && new_room->r_fires == 1)
light(&hero);
}
/* Is monster leaving a room? */
if (old_room != new_room && old_room != NULL) {
if (--(old_room->r_fires) <= 0) {
old_room->r_flags &= ~HASFIRE;
if (cansee(th->t_pos.y, th->t_pos.x))
light(&th->t_pos);
}
}
}
/*
* If monster is entering player's room and player can see it, stop
* the player's running.
*/
if (new_room != old_room && new_room != NULL &&
new_room == ree && cansee(th->t_nxtpos.y, th->t_nxtpos.x) &&
(off(*th, ISINVIS) || (off(*th, ISSHADOW) || rnd(10) == 0) ||
on(player, CANSEE)) && off(*th, CANSURPRISE))
running = FALSE;
if (rer != NULL && (rer->r_flags & ISDARK) &&
!(rer->r_flags & HASFIRE) && sch == FLOOR &&
DISTANCE(th->t_nxtpos.y, th->t_nxtpos.x, th->t_pos.y, th->t_pos.x) < see_dist &&
off(player, ISBLIND))
th->t_oldch = ' ';
else
th->t_oldch = sch;
if (cansee(th->t_nxtpos.y, th->t_nxtpos.x) &&
off(*th, ISINWALL) &&
((off(*th, ISINVIS) && (off(*th, ISSHADOW) || rnd(100) < 10)) ||
on(player, CANSEE)) &&
off(*th, CANSURPRISE))
mvwaddch(cw, th->t_nxtpos.y, th->t_nxtpos.x, th->t_type);
mvwaddch(mw, th->t_pos.y, th->t_pos.x, ' ');
mvwaddch(mw, th->t_nxtpos.y, th->t_nxtpos.x, th->t_type);
/* Record monster's last position (if new one is different) */
if (!ce(th->t_nxtpos, th->t_pos))
th->t_oldpos = th->t_pos;
th->t_pos = th->t_nxtpos; /* Mark the monster's new position */
/* If the monster is on a trap, trap it */
sch = mvinch(th->t_nxtpos.y, th->t_nxtpos.x);
if (isatrap(sch)) {
debug("Monster trapped by %c.", sch);
if (cansee(th->t_nxtpos.y, th->t_nxtpos.x))
th->t_oldch = sch;
be_trapped(th_p, &th->t_nxtpos);
if (!*th_p)
return;
}
/* And stop running if need be */
if (stoprun && ce(th->t_pos, th->t_chasee->t_pos))
{
th->t_ischasing = FALSE;
turn_off(*th, ISRUN);
}
}
/*
* chase_it: Set a monster running after something or stop it from running (for
* when it dies)
*/
void
chase_it(coord *runner, struct thing *th)
{
struct linked_list *item;
struct thing *tp;
/*
* If we couldn't find him, something is funny
*/
if ((item = find_mons(runner->y, runner->x)) == NULL) {
debug("CHASER '%s'", unctrl(winat(runner->y, runner->x)));
return;
}
tp = THINGPTR(item);
/*
* Start the beastie running
*/
tp->t_ischasing = TRUE;
tp->t_chasee = th;
turn_on(*tp, ISRUN);
turn_off(*tp, ISDISGUISE);
}
/*
* chase: Find the spot for the chaser(er) to move closer to the chasee(ee).
* Returns TRUE if we want to keep on chasing later FALSE if we reach the
* goal.
*/
int
chase(struct thing *tp, coord *ee, bool flee)
{
int x, y;
int dist, thisdist, monst_dist = MAXINT;
struct linked_list *weapon;
coord *er = &tp->t_pos, *shoot_dir;
char ch, mch;
bool next_player = FALSE;
/*
* Take care of shooting directions
*/
if (on(*tp, CANBREATHE) || on(*tp, CANSHOOT) || on(*tp, CANCAST))
if (good_monster(*tp)) {
shoot_dir = find_shoot(tp); /* find a mean monster */
if (wizard && shoot_dir)
msg("Found monster to attack towards (%d,%d).",
shoot_dir->x, shoot_dir->y);
}
else
shoot_dir = can_shoot(er, ee); /* shoot hero */
/*
* If the thing is confused, let it move randomly. Some monsters are
* slightly confused all of the time.
*/
if ((on(*tp, ISHUH) && rnd(10) < 8) ||
((on(*tp, ISINVIS) || on(*tp, ISSHADOW)) && rnd(100) < 20) ||
(on(player, ISINVIS) && off(*tp, CANSEE))) { /* Player is invisible */
/* get a valid random move */
tp->t_nxtpos = *rndmove(tp);
dist = DISTANCE(tp->t_nxtpos.y, tp->t_nxtpos.x, ee->y, ee->x);
if (on(*tp, ISHUH) && rnd(20) == 0) /* monster might lose
* confusion */
turn_off(*tp, ISHUH);
/*
* check to see if random move takes creature away from
* player if it does then turn off ISHELD
*/
if (dist > 1 && on(*tp, DIDHOLD)) {
turn_off(*tp, DIDHOLD);
turn_on(*tp, CANHOLD);
if (--hold_count == 0)
turn_off(player, ISHELD);
}
}
/* If we can breathe, we may do so */
else if (on(*tp, CANBREATHE) && (shoot_dir) && (rnd(100) < 67) &&
(off(player, ISDISGUISE) || (rnd(tp->t_stats.s_lvl) > 6)) &&
(DISTANCE(er->y, er->x, ee->y, ee->x) < BOLT_LENGTH * BOLT_LENGTH)) {
short chance;
char *breath;
/* Will it breathe at random */
if (on(*tp, CANBRANDOM)) {
if (rnd(level / 20) == 0 && tp->t_index != nummonst + 1
&& !(good_monster(*tp)))
turn_off(*tp, CANBRANDOM);
/* Select type of breath */
chance = rnd(100);
if (chance < 11)
breath = "acid";
else if (chance < 22)
breath = "flame";
else if (chance < 33)
breath = "lightning bolt";
else if (chance < 44)
breath = "chlorine gas";
else if (chance < 55)
breath = "ice";
else if (chance < 66)
breath = "nerve gas";
else if (chance < 77)
breath = "sleeping gas";
else if (chance < 88)
breath = "slow gas";
else
breath = "fear gas";
}
/* Or can it breathe acid? */
else if (on(*tp, CANBACID)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBACID);
breath = "acid";
}
/* Or can it breathe fire */
else if (on(*tp, CANBFIRE)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBFIRE);
breath = "flame";
}
/* Or can it breathe electricity? */
else if (on(*tp, CANBBOLT)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBBOLT);
breath = "lightning bolt";
}
/* Or can it breathe gas? */
else if (on(*tp, CANBGAS)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBGAS);
breath = "chlorine gas";
}
/* Or can it breathe ice? */
else if (on(*tp, CANBICE)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBICE);
breath = "ice";
}
else if (on(*tp, CANBPGAS)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBPGAS);
breath = "nerve gas";
}
else if (on(*tp, CANBSGAS)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBSGAS);
breath = "sleeping gas";
}
else if (on(*tp, CANBSLGAS)) {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBSLGAS);
breath = "slow gas";
}
else {
if (rnd(level / 20) == 0)
if (!(good_monster(*tp)))
turn_off(*tp, CANBFGAS);
breath = "fear gas";
}
shoot_bolt(tp, *er, *shoot_dir, (tp == THINGPTR(fam_ptr)),
tp->t_index, breath, roll(tp->t_stats.s_lvl, 6));
if (!curr_mons)
return (TRUE);
tp->t_nxtpos = *er;
dist = DISTANCE(tp->t_nxtpos.y, tp->t_nxtpos.x, ee->y, ee->x);
}
/*
* If we can cast spells we might do so - even if adjacent fleeing
* monsters are restricted to certain spells
*/
else if (shoot_dir && on(*tp, CANCAST) &&
(off(player, ISDISGUISE) || (rnd(tp->t_stats.s_lvl) > 6))) {
incant(tp, *shoot_dir);
/*
* If the monster's spell bounces back and kills it,
* then 'tp' is no longer valid, so just return.
*/
if (!curr_mons) {
debug("The monster seems to have killed itself.");
return(FALSE);
}
tp->t_nxtpos = *er;
dist = DISTANCE(tp->t_nxtpos.y, tp->t_nxtpos.x, ee->y, ee->x);
}
/*
* Should we shoot or throw something? fleeing monsters may to shoot
* anyway if far enough away
*/
else if (shoot_dir && on(*tp, CANSHOOT) && (weapon = get_hurl(tp)) &&
(off(*tp, ISFLEE) || rnd(DISTANCE(er->y, er->x, ee->y, ee->x)) > 2) &&
(off(player, ISDISGUISE) || (rnd(tp->t_stats.s_lvl) > 6))) {
missile(shoot_dir->y, shoot_dir->x, weapon, tp);
tp->t_nxtpos = *er;
dist = DISTANCE(tp->t_nxtpos.y, tp->t_nxtpos.x, ee->y, ee->x);
}
/*
* Otherwise, find the empty spot next to the chaser that is closest
* to the chasee.
*/
else {
int ey, ex;
struct room *rer, *ree;
int dist_to_old = MININT; /* Dist from goal to old
* position */
/* Get rooms */
rer = roomin(er);
ree = roomin(ee);
/*
* This will eventually hold where we move to get closer If
* we can't find an empty spot, we stay where we are.
*/
dist = flee ? 0 : MAXINT;
tp->t_nxtpos = *er;
/* Are we at our goal already? */
if (!flee && ce(tp->t_nxtpos, *ee))
return (FALSE);
ey = er->y + 1;
ex = er->x + 1;
for (x = er->x - 1; x <= ex; x++)
for (y = er->y - 1; y <= ey; y++) {
coord tryp;
/* Don't try off the board */
if ((x < 0) || (x >= ur_cols) || (y < 1) || (y >= ur_lines - 2))
continue;
/*
* Don't try the player if not going after
* the player
*/
/* or he's disguised and monster is dumb */
if (((off(*tp, ISFLEE) && !ce(hero, *ee)) ||
(on(player, ISDISGUISE) && (rnd(tp->t_stats.s_lvl) < 6))
|| good_monster(*tp))
&& x == hero.x && y == hero.y)
continue;
tryp.x = x;
tryp.y = y;
/*
* Is there a monster on this spot closer to
* our goal? Don't look in our spot or where
* we were.
*/
if (!ce(tryp, *er) && !ce(tryp, tp->t_oldpos) &&
isalpha(mch = mvwinch(mw, y, x))) {
int test_dist;
test_dist = DISTANCE(y, x, ee->y, ee->x);
if (test_dist <= 25 && /* Let's be fairly close */
test_dist < monst_dist) {
/*
* Could we really move
* there?
*/
mvwaddch(mw, y, x, ' '); /* Temporarily blank
* monst */
if (diag_ok(er, &tryp, tp))
monst_dist = test_dist;
mvwaddch(mw, y, x, mch); /* Restore monster */
}
}
if (!diag_ok(er, &tryp, tp))
continue;
ch = mvwinch(cw, y, x); /* Screen character */
if (on(*tp, ISFLEE) && (ch == PLAYER))
next_player = TRUE;
/*
* Stepping on player is NOT okay if we are
* fleeing
*/
if (step_ok(y, x, NOMONST, tp) &&
(off(*tp, ISFLEE) || ch != PLAYER)) {
/*
* If it is a trap, an intelligent
* monster may not step on it (unless
* our hero is on top!)
*/
if (isatrap(ch)) {
if (!(ch == RUSTTRAP) &&
!(ch == FIRETRAP && on(*tp, NOFIRE)) &&
rnd(10) < tp->t_stats.s_intel &&
(y != hero.y || x != hero.x))
continue;
}
/*
* OK -- this place counts
*/
thisdist = DISTANCE(y, x, ee->y, ee->x);
/*
* Adjust distance if we are being
* shot at
*/
if (tp->t_wasshot && tp->t_stats.s_intel > 5 &&
ce(hero, *ee)) {
/* Move out of line of sight */
if (straight_shot(tryp.y, tryp.x, ee->y, ee->x, (coord *) NULL)) {
if (flee)
thisdist -= SHOTPENALTY;
else
thisdist += SHOTPENALTY;
}
/*
* But do we want to leave
* the room?
*/
else if (rer && rer == ree && ch == DOOR)
thisdist += DOORPENALTY;
}
/*
* Don't move to the last position if
* we can help it
*/
if (ce(tryp, tp->t_oldpos))
dist_to_old = thisdist;
else if ((flee && (thisdist > dist)) ||
(!flee && (thisdist < dist))) {
tp->t_nxtpos = tryp;
dist = thisdist;
}
}
}
/*
* If we are running from the player and he is in our way, go
* ahead and slug him.
*/
if (next_player && DISTANCE(er->y, er->x, ee->y, ee->x) < dist &&
step_ok(tp->t_chasee->t_pos.y, tp->t_chasee->t_pos.x, NOMONST, tp)) {
tp->t_nxtpos = tp->t_chasee->t_pos; /* Okay to hit player */
return FALSE;
}
/*
* If we can't get closer to the player (if that's our goal)
* because other monsters are in the way, just stay put
*/
if (!flee && ce(hero, *ee) && monst_dist < MAXINT &&
DISTANCE(er->y, er->x, hero.y, hero.x) < dist)
tp->t_nxtpos = *er;
/* Do we want to go back to the last position? */
else if (dist_to_old != MININT && /* It is possible to
* move back */
((flee && dist == 0) || /* No other possible
* moves */
(!flee && dist == MAXINT))) {
/* Do we move back or just stay put (default)? */
dist = DISTANCE(er->y, er->x, ee->y, ee->x); /* Current distance */
if (!flee || (flee && (dist_to_old > dist)))
tp->t_nxtpos = tp->t_oldpos;
}
}
/* Make sure we have the real distance now */
dist = DISTANCE(tp->t_nxtpos.y, tp->t_nxtpos.x, ee->y, ee->x);
/* Mark monsters in a wall */
switch (mvinch(tp->t_nxtpos.y, tp->t_nxtpos.x)) {
case WALL:
case '-':
case '|':
turn_on(*tp, ISINWALL);
otherwise:
turn_off(*tp, ISINWALL);
}
if (tp->t_ischasing == TRUE && tp->t_chasee != &player &&
!is_monster(tp->t_chasee)) {
tp->t_ischasing = FALSE;
msg("Workaround another dead chasee bug");
}
if (off(*tp, ISFLEE) &&
(!SAME_POS(tp->t_chasee->t_pos,hero) || off(player, ISINWALL) || on(*tp, CANINWALL)))
return (dist != 0);
/* May actually hit here from a confused move */
else
return (!ce(tp->t_nxtpos, hero));
}
/*
* roomin: Find what room some coordinates are in. NULL means they aren't in
* any room.
*/
struct room *
roomin(coord *cp)
{
struct room *rp;
for (rp = rooms; rp < &rooms[MAXROOMS]; rp++)
if (cp->x <= rp->r_pos.x + (rp->r_max.x - 1)
&& rp->r_pos.x <= cp->x
&& cp->y <= rp->r_pos.y + (rp->r_max.y - 1)
&& rp->r_pos.y <= cp->y)
return rp;
return NULL;
}
/*
* find_mons: Find the monster from his corrdinates
*/
struct linked_list *
find_mons(int y, int x)
{
struct linked_list *item;
for (item = mlist; item != NULL; item = next(item)) {
struct thing *th = THINGPTR(item);
if (th->t_pos.y == y && th->t_pos.x == x)
return item;
}
return NULL;
}
/*
* is_monster: Is this a current monster?
*/
bool
is_monster(struct thing *th)
{
struct linked_list *item;
if (th == NULL)
return NULL;
for (item = mlist; item != NULL; item = next(item))
{
if (th == THINGPTR(item))
return TRUE;
}
if (th == THINGPTR(fam_ptr))
return TRUE;
return NULL;
}
/*
* Find an unfriendly monster around us to hit
*/
struct linked_list *
f_mons_a(int y, int x, bool hit_bad)
{
int row, col;
struct linked_list *item;
struct thing *tp;
for (row = x - 1; row <= x + 1; row++)
for (col = y - 1; col <= y + 1; col++)
if (row == x && col == y)
continue;
else if (col > 0 && row > 0 &&
isalpha(mvwinch(mw, col, row)) &&
((item = find_mons(col, row)) != NULL)) {
tp = THINGPTR(item);
if ((good_monster(*tp) && !hit_bad) ||
(!good_monster(*tp) && hit_bad))
return (item);
}
return (NULL);
}
/*
* diag_ok: Check to see if the move is legal if it is diagonal
*/
bool
diag_ok(coord *sp, coord *ep, struct thing *flgptr)
{
if (ep->x == sp->x || ep->y == sp->y)
return TRUE;
return (step_ok(ep->y, sp->x, MONSTOK, flgptr) &&
step_ok(sp->y, ep->x, MONSTOK, flgptr));
}
/*
* cansee: returns true if the hero can see a certain coordinate.
*/
bool
cansee(int y, int x)
{
struct room *rer;
coord tp;
if (on(player, ISBLIND))
return FALSE;
tp.y = y;
tp.x = x;
rer = roomin(&tp);
/*
* We can only see if the hero in the same room as the coordinate and
* the room is lit or if it is close.
*/
return ((rer != NULL &&
rer == roomin(&hero) &&
(!(rer->r_flags & ISDARK) || (rer->r_flags & HASFIRE)) &&
(levtype != MAZELEV || /* Maze level needs direct line */
maze_view(tp.y, tp.x))) ||
DISTANCE(y, x, hero.y, hero.x) < see_dist);
}
static coord shoot_dir;
coord *
find_shoot(struct thing *tp)
{
struct room *rtp;
int ulx, uly, xmx, ymx, xmon, ymon, tpx, tpy, row, col;
struct linked_list *mon;
struct thing *ick;
rtp = roomin(&tp->t_pos); /* Find room of chaser */
if (rtp == NULL)
return NULL;
ulx = rtp->r_pos.x;
uly = rtp->r_pos.y;
xmx = rtp->r_max.x;
ymx = rtp->r_max.y;
tpx = tp->t_pos.x;
tpy = tp->t_pos.y;
for (col = ulx; col < (ulx + xmx); col++)
for (row = uly; row < (uly + ymx); row++) {
if (row > 0 && col > 0 && isalpha(mvwinch(mw, row, col))) {
if ((mon = find_mons(row, col))) {
ick = THINGPTR(mon);
xmon = ick->t_pos.x;
ymon = ick->t_pos.y;
if (!(good_monster(*ick))) {
if (straight_shot(tpy, tpx, ymon, xmon, &shoot_dir))
return (&shoot_dir);
}
}
}
}
return (NULL);
}
/*
* Can_shoot determines if the monster (er) has a direct line of shot at the
* player (ee). If so, it returns the direction in which to shoot.
*/
coord *
can_shoot(coord *er, coord *ee)
{
int ery, erx, eey, eex;
/* Make sure we are chasing the player */
if (!ce((*ee), hero))
return (NULL);
/* They must be in the same room */
if (roomin(er) != roomin(&hero))
return (NULL);
ery = er->y;
erx = er->x;
eey = ee->y;
eex = ee->x;
/* Will shoot unless next to player, then 80% prob will fight */
if ((DISTANCE(ery, erx, eey, eex) < 4) && (rnd(100) < 80))
return (NULL);
/* Do we have a straight shot? */
if (!straight_shot(ery, erx, eey, eex, &shoot_dir))
return (NULL);
else
return (&shoot_dir);
}
/*
* straight_shot: See if there is a straight line of sight between the two
* given coordinates. If shooting is not NULL, it is a pointer to a
* structure which should be filled with the direction to shoot (if there is
* a line of sight). If shooting, monsters get in the way. Otherwise, they
* do not.
*/
bool
straight_shot(int ery, int erx, int eey, int eex, coord *shooting)
{
int dy, dx; /* Deltas */
char ch;
/* Does the monster have a straight shot at player */
if ((ery != eey) && (erx != eex) &&
(abs(ery - eey) != abs(erx - eex)))
return (FALSE);
/* Get the direction to shoot */
if (eey > ery)
dy = 1;
else if (eey == ery)
dy = 0;
else
dy = -1;
if (eex > erx)
dx = 1;
else if (eex == erx)
dx = 0;
else
dx = -1;
/* Make sure we have free area all the way to the player */
ery += dy;
erx += dx;
while ((ery != eey) || (erx != eex)) {
switch (ch = winat(ery, erx)) {
case '|':
case '-':
case WALL:
case DOOR:
case SECRETDOOR:
return (FALSE);
default:
if (shooting && isalpha(ch))
return (FALSE);
}
ery += dy;
erx += dx;
}
if (shooting) { /* If we are shooting -- put in the
* directions */
shooting->y = dy;
shooting->x = dx;
}
return (TRUE);
}