Better movement AI for ranged attackers.

When you leave the LOS of a monster with ranged attacks, it will try to regain
a line of fire instead of coming straight after you.

This is the end of the "duck behind a corner" strategy. Next CDO update is
going to be fun ;)

This is of course going to make all monsters with ranged attacks more
dangerous, especially to melee. On the other hand, they are a bit easier to
escape from (if too easy, reduce ideal_range to 3). To balance it we can make
scrolls of fog more frequent and/or more effective.

As it is my first time messing with monster AI, the code probably needs some
review. I have cleared firing_pos in several places to be safe, but some may
be useless. Also, the _set_firing_pos function is maybe a bit expensive, but
it shouldn't be too much of an issue, as it is not called very often.

1 files changed, 2 insertions, 0 deletions

diff --git a/crawl-ref/source/mon-act.h b/crawl-ref/source/mon-act.h
index 040aa166f3..a44cd24caa 100644
--- a/crawl-ref/source/mon-act.h
+++ b/crawl-ref/source/mon-act.h
@@ -7,6 +7,8 @@
 #ifndef MONACT_H
 #define MONACT_H
 
+bool mon_can_move_to_pos(const monster* mons, const coord_def& delta,
+                         bool just_check = false);
 bool mons_can_move_towards_target(const monster* mon);
 
 void handle_monsters(void);