Cleave effect for Axes.

* Additional targets are acquired by rotating from the main target in both
  directions but no more than 3 cells. Solid features block cleaving. On
  open grounds, it attacks 7 cells (all but the opposite one from the main
  target).
  A single wall on the side can block one or two targets since it doesn't go
  all around.
* Additional attacks do 75% damage. Main target still takes full damage.
* Allies don't block cleaving and are not harmed by it unless attacker
  is confused.
* Monsters wielding axes get cleaving too.
* Broad axe, battleaxe and executioner's axe base damage is reduced by 1.
  More nerfing might be needed for the latter 2.
* Cleaving works when attacking empty spaces (useful against invisible
  monsters)
* Monsters dual wielding axes should work.

Thanks to LexAckson for helping with this implementation
(especially rotate_adjacent).

1 files changed, 11 insertions, 1 deletions

diff --git a/crawl-ref/source/melee_attack.h b/crawl-ref/source/melee_attack.h
index 0eac7a1ed2..51ef5f136a 100644
--- a/crawl-ref/source/melee_attack.h
+++ b/crawl-ref/source/melee_attack.h
@@ -1,6 +1,8 @@
 #ifndef MELEE_ATTACK_H
 #define MELEE_ATTACK_H
 
+#include <list>
+
 #include "artefact.h"
 #include "attack.h"
 #include "fight.h"
@@ -44,6 +46,9 @@ public:
     bool    stab_attempt;
     int     stab_bonus;
 
+    list<actor*> cleave_targets;
+    bool         cleaving;        // additional attack from cleaving
+
     // Miscast to cause after special damage is done. If miscast_level == 0
     // the miscast is discarded if special_damage_message isn't empty.
     int    miscast_level;
@@ -54,7 +59,8 @@ public:
 
 public:
     melee_attack(actor *attacker, actor *defender,
-                 int attack_num = -1, int effective_attack_num = -1);
+                 int attack_num = -1, int effective_attack_num = -1,
+                 bool is_cleaving = false);
 
     // Applies attack damage and other effects.
     bool attack();
@@ -99,6 +105,10 @@ private:
                          int dam_type,
                          brand_type wpn_brand);
 
+    /* Axe cleaving */
+    void cleave_setup();
+    int cleave_damage_mod(int dam);
+
     /* Mutation Effects */
     void do_spines();
     void do_passive_freeze();