[1749272] Fixed view update issues:

- Redraw view when entering a new level before allowing monsters on the
  level to act.
- Monsters are redrawn on the view as and when they move, instead of
  postponing the view update to the end of turn.
- Beam animations and monster redraws force a view update if the view is
  stale (such as when a beam is shown during travel and travel_delay =
  -1). 

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1925 c06c8d41-db1a-0410-9941-cceddc491573

1 files changed, 25 insertions, 0 deletions

diff --git a/crawl-ref/source/mon-util.cc b/crawl-ref/source/mon-util.cc
index aee81286ff..1dc3d462fd 100644
--- a/crawl-ref/source/mon-util.cc
+++ b/crawl-ref/source/mon-util.cc
@@ -259,6 +259,12 @@ unsigned long get_mons_resists(const monsters *mon)
     return (resists);
 }
 
+monsters *monster_at(const coord_def &pos)
+{
+    const int mindex = mgrd(pos);
+    return (mindex != NON_MONSTER? &menv[mindex] : NULL);
+}
+
 int mons_piety(const monsters *mon)
 {
     if (mon->god == GOD_NO_GOD)
@@ -4200,6 +4206,25 @@ bool monsters::is_icy() const
     return (mons_is_icy(type));
 }
 
+bool monsters::has_action_energy() const
+{
+    return (speed_increment >= 80);
+}
+
+void monsters::check_redraw(const coord_def &old) const
+{
+    const bool see_new = see_grid(pos());
+    const bool see_old = see_grid(old);
+    if ((see_new || see_old) && !view_update())
+    {
+        if (see_new)
+            view_update_at(pos());
+        if (see_old)
+            view_update_at(old);
+        update_screen();
+    }
+}
+
 /////////////////////////////////////////////////////////////////////////
 // mon_enchant