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|
---------------------------------------------------------------------------
-- lm_monst.lua
-- Create a monster on certain events
--------------------------------------------------------------------------
--------------------------------------------------------------------------------------
-- This marker creates a monster on certain events. It uses the following parameters:
--
-- * death_monster: The name of the monster who's death triggers the creation of
-- the new monster.
--
-- * new_monster: The name of the monster to create.
--
-- * message: Message to give when monster is created, regardless of whether
-- or not the player can see the marker.
--
-- * message_seen: Message to give if the player can see the marker.
--
-- * message_unseen: Message to give if the player can't see the marker.
--
-- NOTE: If the feature where the marker is isn't habitable by the new monster,
-- the feature will be changed to the monster's primary habitat.
--------------------------------------------------------------------------------------
-- TODO:
-- * Place more than one monster.
-- * Place monster displaced from marker.
MonsterOnTrigger = { CLASS = "MonsterOnTrigger" }
MonsterOnTrigger.__index = MonsterOnTrigger
function MonsterOnTrigger:_new()
local pm = { }
setmetatable(pm, self)
self.__index = self
return pm
end
function MonsterOnTrigger:new(pars)
pars = pars or { }
if not pars.death_monster or pars.death_monster == "" then
error("Must provide death_monster")
end
if not pars.new_monster or pars.new_monster == "" then
error("Must provide new_monster")
end
pars.message_seen = pars.message_seen or pars.message or ""
pars.message_unseen = pars.message_unseen or pars.message or ""
local pm = self:_new()
pm.message_seen = pars.message_seen
pm.message_unseen = pars.message_unseen
pm.death_monster = pars.death_monster
pm.new_monster = pars.new_monster
pm.props = pars
return pm
end
function MonsterOnTrigger:property(marker, pname)
return self.props[pname] or ''
end
function MonsterOnTrigger:write(marker, th)
lmark.marshall_table(th, self)
end
function MonsterOnTrigger:read(marker, th)
return MonsterOnTrigger:new(lmark.unmarshall_table(th))
end
function MonsterOnTrigger:activate(marker)
dgn.register_listener(dgn.dgn_event_type('monster_dies'), marker)
end
function MonsterOnTrigger:event(marker, ev)
local midx = ev:arg1()
local mons = dgn.mons_from_index(midx)
if not mons then
error("MonsterOnTrigger:event() didn't get a valid monster index")
end
if mons.name == self.death_monster then
local x, y = marker:pos()
local you_x, you_y = you.pos()
if x == you_x and y == you_y then
return
end
-- you.losight() seems to be necessary if the player has been moved by
-- a wizard command and then the marker triggered by another wizard
-- command, since then no turns will have been taken and the LOS info
-- won't have been updated.
you.losight()
local see_grid = you.see_grid(x, y)
if (not dgn.create_monster(x, y, self.new_monster)) then
return
elseif self.message_seen ~= "" and see_grid then
crawl.mpr(self.message_seen)
elseif self.message_unseen ~= "" and not see_grid then
crawl.mpr(self.message_unseen)
end
dgn.remove_listener(marker)
dgn.remove_marker(marker)
end
end
function monster_on_trigger(pars)
return MonsterOnTrigger:new(pars)
end
|
