Lua distance bindings, Volcano tweaks, FogMachine message tweaks.

New binding for coord.cc's distance functions (dgn.distance(x1, y1, x2, y2)), lua function "point_in_radius", accepts two dgn.point functions and a radius and returns true if point1 is in radius around point2.

Extensive tweaks to FogMachine warning messages: most now accept a "see function" as the final parameter, which should take two parameters: an x and a y. The function should return true if the player can "see" this point.

Finally, tweaks to Volcanoes: utilise see_function and dgn.point_in_radius to provide better warning for lake. Utilise greensnark's new slave/master system for chaining FogMachines together in Bunker and Village.

Signed-off-by: Darshan Shaligram <dshaligram@users.sourceforge.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/crawl-ref/source/l_dgngrd.cc b/crawl-ref/source/l_dgngrd.cc
index b8f1181fa0..7bb9a42e09 100644
--- a/crawl-ref/source/l_dgngrd.cc
+++ b/crawl-ref/source/l_dgngrd.cc
@@ -223,6 +223,14 @@ static int dgn_grid(lua_State *ls)
 LUARET1(_dgn_is_wall, boolean,
         feat_is_wall(static_cast<dungeon_feature_type>(luaL_checkint(ls, 1))))
 
+LUAFN(dgn_distance)
+{
+    COORDS(p1, 1, 2);
+    COORDS(p2, 3, 4);
+    lua_pushnumber(ls, distance(p1, p2));
+    return (1);
+}
+
 LUAFN(_dgn_is_opaque)
 {
     COORDS(c, 1, 2);
@@ -243,6 +251,7 @@ const struct luaL_reg dgn_grid_dlib[] =
 { "is_opaque", _dgn_is_opaque },
 { "is_wall", _dgn_is_wall },
 { "max_bounds", dgn_max_bounds },
+{ "distance", dgn_distance },
 
 { NULL, NULL }
 };