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|
------------------------------------------------------------------------------
-- lm_fog.lua:
-- Fog machines.
--
-- There are three different "pure" ways to use a fog machine marker:
--
-- 1) Repeatedly lay down medium to large clouds on top of the marker
-- and let them pile up on one another. (One of the cloud grids in
-- the first laid cloud has to decay away before this is this really
-- starts working.
--
-- 2) Perform random walks from the marker and place a single-grid cloud
-- at the destination of each walk.
--
-- 3) Place a single-grid cloud on the marker and let it spread out.
--
-- Combining these different methods, along with varying the different
-- parameters, can be used to achieve different effects.
--
-- Fog machines can be "chained" together (activated at the same time) by using
-- the convenience function "chained_fog_machine" with the normal paramaters
-- which are accepted by "fog_machine".
--
-- Marker parameters:
--
-- cloud_type: The name of the cloud type to use. Possible cloud types are:
-- flame, noxious fumes, freezing vapour, poison gases,
-- grey smoke, blue smoke, purple smoke, steam, rain,
-- foul pestilence, black smoke, mutagenic fog, thin mist (the default).
-- walk_dist: The distance to move over the course of one random walk.
-- defaults to 0.
-- pow_min: The minimum "power" (lifetime) of each cloud; defaults to 1.
-- pow_max: The maximum power of each cloud; must be provided.
-- pow_rolls: The number of rolls of [pow_min, pow_max], with the average
-- value uses; increasing the values makes the average value more likely
-- and extreme values less likely. Defaults to 1.
-- delay, delay_min and delay_max: The delay between laying down one cloud
-- and the next. 10 is equal to normal-speed player turn. Either
-- delay or delay_max and delay_min must be provided. Providing just
-- "delay" is equivalent to delay_min and delay_max being equal.
-- size, size_min and size_max: The number of grids each cloud will cover.
-- Either size or size_max and size_min must be provided. Providing
-- just "size" is equivalent to size_min and size_max being equal.
-- size_buildup_amnt, size_buildup_time: Increase the cloud size over time.
-- Adds (size_buildup_amnt / size_buildup_time * turns_since_made)
-- to size_min and size_max, maxing out at size_buildup_amnt.
-- spread_rate: The rate at which a cloud spreads. Must either be
-- -1 (default spread rate that varies by cloud type) or between
-- 0 and 100 inclusive.
-- spread_rate_amnt, spread_rate_buildup: Similar to size_buildup_amnt
-- and size_buildup_time
-- start_clouds: The number of clouds to lay when the level containing
-- the cloud machine is entered. This is necessary since clouds
-- are cleared when the player leaves a level.
-- listener: A FunctionMachine listener marker. Will be called
-- whenever the countdown is activated, and whenever the fog
-- machine is reset. It will be called with the FogMachine's
-- marker, a string containing the event ("decrement", "trigger"),
-- the actual event object, and a copy of the FogMachine itself.
-- See the section "Messages for fog machines" at the end of the
-- file.
--
------------------------------------------------------------------------------
FogMachine = { CLASS = "FogMachine" }
FogMachine.__index = FogMachine
function FogMachine:_new()
local m = { }
setmetatable(m, self)
self.__index = self
return m
end
function FogMachine:new(pars)
if not pars then
error("No parameters provided")
end
if not pars.pow_max then
error("No pow_max provided.")
end
if not (pars.delay or (pars.delay_min and pars.delay_max)) then
error("Delay parameters not provided.")
end
if not (pars.size or (pars.size_min and pars.size_max)) then
error("Size parameters not provided.")
end
local m = FogMachine:_new()
m.cloud_type = pars.cloud_type or "thin mist"
m.walk_dist = pars.walk_dist or 0
m.pow_min = pars.pow_min or 1
m.pow_max = pars.pow_max
m.pow_rolls = pars.pow_rolls or 3
m.delay_min = pars.delay_min or pars.delay or 1
m.delay_max = pars.delay_max or pars.delay
m.kill_cat = pars.kill_cat or "other"
m.size_min = pars.size_min or pars.size or 1
m.size_max = pars.size_max or pars.size
m.spread_rate = pars.spread_rate or -1
m.start_clouds = pars.start_clouds or 1
m.listener = pars.listener or nil
m.size_buildup_amnt = pars.size_buildup_amnt or 0
m.size_buildup_time = pars.size_buildup_time or 1
m.spread_buildup_amnt = pars.spread_buildup_amnt or 0
m.spread_buildup_time = pars.spread_buildup_time or 1
m.buildup_turns = 0
m.countdown = 0
return m
end
function FogMachine:apply_cloud(point, pow_min, pow_max, pow_rolls,
size, cloud_type, kill_cat, spread)
dgn.apply_area_cloud(point.x, point.y, pow_min, pow_max, pow_rolls, size,
cloud_type, kill_cat, spread)
end
function FogMachine:do_fog(point)
local p = point
if self.walk_dist > 0 then
p = dgn.point(dgn.random_walk(p.x, p.y, self.walk_dist))
end
local buildup_turns = self.buildup_turns
-- Size buildup
if buildup_turns > self.size_buildup_time then
buildup_turns = self.size_buildup_time
end
local size_buildup = self.size_buildup_amnt * buildup_turns /
self.size_buildup_time
local size_min = self.size_min + size_buildup
local size_max = self.size_max + size_buildup
if (size_min < 0) then
size_min = 0
end
-- Spread buildup
buildup_turns = self.buildup_turns
if buildup_turns > self.spread_buildup_time then
buildup_turns = self.spread_buildup_time
end
local spread = self.spread_rate + (self.spread_buildup_amnt * buildup_turns /
self.spread_buildup_time)
self:apply_cloud(p, self.pow_min, self.pow_max, self.pow_rolls,
crawl.random_range(size_min, size_max, 1),
self.cloud_type, self.kill_cat, spread)
end
function FogMachine:activate(marker, verbose)
local _x, _y = marker:pos()
dgn.register_listener(dgn.dgn_event_type('turn'), marker)
dgn.register_listener(dgn.dgn_event_type('entered_level'), marker)
end
function FogMachine:notify_listener(point, event, evobj)
if self.listener then
return self.listener:do_function(point, event, ev, self)
end
end
function FogMachine:event(marker, ev)
local _x, _y = marker:pos()
if ev:type() == dgn.dgn_event_type('turn') then
self.countdown = self.countdown - ev:ticks()
self.buildup_turns = self.buildup_turns + ev:ticks()
if (self.buildup_turns > self.size_buildup_time) then
self.buildup_turns = self.size_buildup_time
end
if self.countdown > 0 then
self:notify_listener(dgn.point(marker:pos()), "decrement", ev)
elseif self.countdown <= 0 then
self:notify_listener(dgn.point(marker:pos()), "trigger", ev)
end
while self.countdown <= 0 do
self:do_fog(dgn.point(marker:pos()))
self.countdown = self.countdown +
crawl.random_range(self.delay_min, self.delay_max, 1)
end
elseif ev:type() == dgn.dgn_event_type('entered_level') then
for i = 1, self.start_clouds do
self:do_fog(dgn.point(marker:pos()))
self:notify_listener(dgn.point(marker:pos()), "trigger", ev)
self.countdown = crawl.random_range(self.delay_min, self.delay_max, 1)
self.buildup_turns = 0
end
end
end
function FogMachine:write(marker, th)
file.marshall(th, self.cloud_type)
file.marshall(th, self.walk_dist)
file.marshall(th, self.pow_min)
file.marshall(th, self.pow_max)
file.marshall(th, self.pow_rolls)
file.marshall(th, self.delay_min)
file.marshall(th, self.delay_max)
file.marshall(th, self.kill_cat)
file.marshall(th, self.size_min)
file.marshall(th, self.size_max)
file.marshall(th, self.spread_rate)
file.marshall(th, self.start_clouds)
file.marshall(th, self.size_buildup_amnt)
file.marshall(th, self.size_buildup_time)
file.marshall(th, self.spread_buildup_amnt)
file.marshall(th, self.spread_buildup_time)
file.marshall(th, self.buildup_turns)
file.marshall(th, self.countdown)
if self.listener then
file.marshall_meta(th, true)
self.listener:write(marker, th)
else
file.marshall_meta(th, false)
end
end
function FogMachine:read(marker, th)
self.cloud_type = file.unmarshall_string(th)
self.walk_dist = file.unmarshall_number(th)
self.pow_min = file.unmarshall_number(th)
self.pow_max = file.unmarshall_number(th)
self.pow_rolls = file.unmarshall_number(th)
self.delay_min = file.unmarshall_number(th)
self.delay_max = file.unmarshall_number(th)
self.kill_cat = file.unmarshall_string(th)
self.size_min = file.unmarshall_number(th)
self.size_max = file.unmarshall_number(th)
self.spread_rate = file.unmarshall_number(th)
self.start_clouds = file.unmarshall_number(th)
self.size_buildup_amnt = file.unmarshall_number(th)
self.size_buildup_time = file.unmarshall_number(th)
self.spread_buildup_amnt = file.unmarshall_number(th)
self.spread_buildup_time = file.unmarshall_number(th)
self.buildup_turns = file.unmarshall_number(th)
self.countdown = file.unmarshall_number(th)
got_listener = file.unmarshall_meta(th)
if got_listener == true then
self.listener = function_machine {
marker_type = "listener",
func = (function() end)
}
self.listener:read(marker, th)
else
self.listener = nil
end
setmetatable(self, FogMachine)
return self
end
function fog_machine(pars)
return FogMachine:new(pars)
end
function chained_fog_machine(pars)
return lmark.synchronized_markers(FogMachine:new(pars), "do_fog")
end
function fog_machine_geyser(cloud_type, size, power, buildup_amnt,
buildup_time)
return FogMachine:new {
cloud_type = cloud_type, pow_max = power, size = size,
delay_min = power , delay_max = power * 2,
size_buildup_amnt = buildup_amnt or 0,
size_buildup_time = buildup_time or 1
}
end
function fog_machine_spread(cloud_type, size, power, buildup_amnt,
buildup_time)
return FogMachine:new {
cloud_type = cloud_type, pow_max = power, spread_rate = size,
size = 1, delay_min = 5, delay_max = 15,
spread_buildup_amnt = buildup_amnt or 0,
spread_buildup_time = buildup_time or 1
}
end
function fog_machine_brownian(cloud_type, size, power)
return FogMachine:new {
cloud_type = cloud_type, size = 1, pow_max = power,
walk_dist = size, delay_min = 1, delay_max = power / size
}
end
-------------------------------------------------------------------------------
-- Messages for fog machines.
--
-- * warning_machine: Takes three parameters: turns, cantsee_message,
-- and, optionally, see_message. Turns is the value of player
-- turns before to trigger the message before the fog machine is
-- fired. If only see_message is provided, the message will only
-- be printed if the player can see the fog machine. If only
-- cantsee_mesage is provided, the message will be displayed
-- regardless. In combination, the message will be different
-- depending on whether or not the player can see the marker. By
-- default, the message will be displaying using the "warning"
-- channel.
--
-- * trigger_machine: Takes three parameters: cantsee_message,
-- see_message, and, optionally, channel. The functionality is
-- identical to a warning_machine, only the message is instead
-- displayed (or not displayed) when the fog machine is
-- triggered. The message channel can be provided.
--
-- * tw_machine: Combines the above two message machines, providing
-- warning messages as well as messages when triggered. Takes the
-- parameters: warn_turns, warning_cantsee_message,
-- trigger_cantsee_message, trigger_channel, trigger_see_message,
-- warning_see_message. Parameters work as described above.
--
-- In all instances, the "cantsee" form of the message parameter
-- cannot be null, and for warning and dual trigger/warning machines,
-- the turns parameter cannot be null. All other parameters are
-- considered optional.
function warning_machine (trns, cantsee_mesg, see_mesg, see_func)
if trns == nil or (see_mesg == nil and cantsee_mesg == nil) then
error("WarningMachine requires turns and message!")
end
local function warning_func (point, mtable, event_name, event, fm)
local countdown = fm.countdown
if event_name == "decrement" and countdown <= mtable.turns then
if not mtable.warning_done then
if mtable.see_message and mtable.see_function(point.x, point.y) then
crawl.mpr(mtable.see_message, "warning")
elseif mtable.cantsee_message then
crawl.mpr(mtable.cantsee_message, "warning")
end
mtable.warning_done = true
end
elseif event_name == "trigger" then
mtable.warning_done = false
end
end
pars = {marker_type = "listener"}
if not see_func then
see_func = you.see_cell
end
pars.marker_params = {
see_message = see_mesg,
cantsee_message = cantsee_mesg,
turns = trns * 10,
warning_done = false,
see_function = see_func
}
pars.func = warning_func
return FunctionMachine:new(pars)
end
function trigger_machine (cantsee_mesg, see_mesg, chan, see_func)
if see_mesg == nil and cantsee_mesg == nil then
error("Triggermachine requires a message!")
end
local function trigger_func (point, mtable, event_name, event, fm)
local countdown = fm.countdown
if event_name == "trigger" then
channel = mtable.channel or ""
if mtable.see_message ~= nil and mtable.see_function(point.x, point.y) then
crawl.mpr(mtable.see_message, channel)
elseif mtable.cantsee_message ~= nil then
crawl.mpr(mtable.cantsee_message, channel)
end
end
end
pars = {marker_type = "listener"}
if not see_func then
see_func = you.see_cell
end
pars.marker_params = {
channel = chan or nil,
see_message = see_mesg,
cantsee_message = cantsee_mesg,
see_function = see_func
}
pars.func = trigger_func
return FunctionMachine:new(pars)
end
function tw_machine (warn_turns, warn_cantsee_message,
trig_cantsee_message, trig_channel,
trig_see_message, warn_see_message, see_func)
if (not warn_turns or (not warn_see_message and not warn_cantsee_message)
or (not trig_see_message and not trig_cantsee_message)) then
error("TWMachine needs warning turns, warning message and "
.. "triggering message.")
end
local function tw_func (point, mtable, event_name, event, fm)
local countdown = fm.countdown
if event_name == "decrement" and countdown <= mtable.warning_turns then
if mtable.warning_done ~= true then
if mtable.warning_see_message and mtable.see_function(point.x, point.y) then
crawl.mpr(mtable.warning_see_message, "warning")
elseif mtable.warning_cantsee_message ~= nil then
crawl.mpr(mtable.warning_cantsee_message, "warning")
end
mtable.warning_done = true
end
elseif event_name == "trigger" then
mtable.warning_done = false
channel = mtable.trigger_channel or ""
if mtable.trigger_see_message and mtable.see_function(point.x, point.y) then
crawl.mpr(mtable.trigger_see_message, channel)
elseif mtable.trigger_cantsee_message ~= nil then
crawl.mpr(mtable.trigger_cantsee_message, channel)
end
end
end
if not see_func then
see_func = you.see_cell
end
pars = {marker_type = "listener"}
pars.marker_params = {
warning_see_message = warn_see_message,
warning_cantsee_message = warn_cantsee_message,
warning_turns = warn_turns * 10,
warning_done = false,
trigger_see_message = trig_see_message,
trigger_cantsee_message = trig_cantsee_message,
trigger_channel = trig_channel or nil,
see_function = see_func
}
pars.func = tw_func
return FunctionMachine:new(pars)
end
|