New targetting code; for now for reaching and Fire Storm.

directn.cc tried to assume everything is a beam, this make it impossible
to properly visualise spells/effects with different rules, like reaching,
clouds, IOOD, shotgun-targetted spells, cones, etc.  This interface lets
every spell come with an object that answers the question: if I aim at X,
will location Y be affected?

There are three levels of aiming effect now:
* tracer only
* might be affected
* will be affected unless you miss

This means we can show spells that have randomized area: Freezing Cloud,
Fire Storm's radius, etc.

TODO: display in tiles.

The old targetter has a great number of special cases, I did not replace
it yet since it would be a large amount of work.  The new code allows for
showing explosions and bounces, but I'd start with clouds and such first.
Fire Storm is a good sample.

Also, this commit fixes the targetter not allowing you to reach sqrt(8) via
'f' or '.'; you had to use '!' to do that.  A number of places in the code
assumed that, with a special distinction for two modes of reaching.

1 files changed, 3 insertions, 1 deletions

diff --git a/crawl-ref/source/spl-util.h b/crawl-ref/source/spl-util.h
index 8431cf28e0..29753d41c5 100644
--- a/crawl-ref/source/spl-util.h
+++ b/crawl-ref/source/spl-util.h
@@ -9,6 +9,7 @@
 #define SPL_UTIL_H
 
 #include "enum.h"
+#include "target.h"
 
 enum spschool_flag_type
 {
@@ -138,7 +139,8 @@ bool spell_direction(dist &spelld, bolt &pbolt,
                       bool may_target_self = false,
                       const char *target_prefix = NULL,
                       const char *prompt = NULL,
-                      bool cancel_at_self = false);
+                      bool cancel_at_self = false,
+                      targetter *hitfunc = NULL);
 
 skill_type spell_type2skill (unsigned int which_spelltype);