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------------------------------------------------------------------------------
-- lm_tmsg.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 gfirst 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.
--
-- Comibining these different methods, along with varying the differrent
-- parameters, can be used to achieve different effects.
--
-- Marker parameters:
--
-- cloud_type: The name of the cloud type to use. Defaults to "thin mist".
-- 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 exterme 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.
-- 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.
-- 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.
------------------------------------------------------------------------------
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.countdown = 0
return m
end
function FogMachine:do_fog(marker)
local x, y = marker:pos()
if self.walk_dist > 0 then
x, y = dgn.random_walk(x, y, self.walk_dist)
end
dgn.apply_area_cloud(x, y, self.pow_min, self.pow_max, self.pow_rolls,
crawl.random_range(self.size_min, self.size_max, 1),
self.cloud_type, self.kill_cat, self.spread_rate)
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:event(marker, ev)
local _x, _y = marker:pos()
if ev:type() == dgn.dgn_event_type('turn') then
self.countdown = self.countdown - ev:ticks()
while self.countdown <= 0 do
self:do_fog(marker)
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(marker)
self.countdown = crawl.random_range(self.delay_min, self.delay_max, 1)
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.countdown)
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.countdown = file.unmarshall_number(th)
setmetatable(self, FogMachine)
return self
end
function fog_machine(pars)
return FogMachine:new(pars)
end
function fog_machine_geyser(cloud_type, size, power)
return FogMachine:new {
cloud_type = cloud_type, pow_max = power, size = size,
delay_min = power , delay_max = power * 2
}
end
function fog_machine_spread(cloud_type, size, power)
return FogMachine:new {
cloud_type = cloud_type, pow_max = power, spread_rate = size,
size = 1, delay_min = 5, delay_max = 15
}
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
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