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-- reimplementation of [metro] with a twist
-- fbar 2007
-- we need an urn:
local urn = {}
function urn.new(size)
assert(size > 0, "Error: size of urn must be greater than 0")
local t = {size=size, last=size}
for i=1,size do
t[i] = i
end
return t
end
function urn.get(u)
if u.last > 0 then
local i = math.random(u.last)
local res = u[i]
u[i] = u[u.last]
u.last = u.last - 1
return res
else
return nil
end
end
function urn.reset(u)
u.last = u.size
for i=1,u.size do
u[i] = i
end
end
local modes = {"alea", "series", "sequence", "rota"}
local function contains(t,x)
for k,v in pairs(t) do
if v == x then return true end
end
return false
end
-- pd:
local M = pd.Class:new():register("luametro")
function M:initialize(name, atoms)
self.periods = {}
self.i = 1
self.mode = "sequence"
self.direction = 1
self.u = urn.new(math.max(1, #atoms))
if not self:setperiods(atoms) then return false end
self.inlets = 2
self.outlets = 2
return true
end
function M:postinitialize()
self.clock = pd.Clock:new():register(self, "tick")
end
function M:finalize()
self.clock:destruct()
end
function M:setperiods(periods)
self.periods = {}
for i,j in ipairs(periods) do
if type(j) == "number" then
self.periods[i] = math.max(0.01, j)
else
self:error("non-number in period list!")
return false
end
end
-- start over at front:
self.i = 1
return true
end
function M:in_2(sel, atoms)
if sel == "list" or sel == "float" then
self:setperiods(atoms)
end
end
function M:in_1_float(f)
if f ~= 0 then
self:tick()
else
self.clock:unset()
end
end
function M:in_1_bang()
self.i = 1
self:tick()
end
function M:in_1_start()
self.i = 1
self:tick()
end
function M:in_1_stop()
self.clock:unset()
end
function M:in_1_mode(atoms)
if type(atoms[1]) == "number" then
self.mode = modes[atoms[1]]
if self.mode == "series" then
self.u = urn.new(#self.periods)
end
self.i = 1
elseif type(atoms[1]) == "string" then
if contains(modes, atoms[1]) then
self.mode = atoms[1]
else
self:error("no such mode: " .. atoms[1])
end
end
pd.post("Mode set to: " .. self.mode)
end
function M:tick()
self:outlet(1, "bang", {})
-- pd.post("selection: " .. tostring(self.i))
if type(self.periods[self.i]) == "number" then
self.clock:delay(self.periods[self.i])
end
if self.mode == "sequence" then
self.i = self.i + 1
if self.i > #self.periods then
self.i = 1
self:outlet(2, "bang", {})
end
elseif self.mode == "alea" then
self.i = math.random(#self.periods)
elseif self.mode == "series" then
local f = urn.get(self.u)
if not f then
urn.reset(self.u)
f = urn.get(self.u)
self:outlet(2, "bang", {})
end
self.i = f
elseif self.mode == "rota" then
self.i = self.i + self.direction
if self.i > #self.periods or self.i < 1 then
self.direction = -self.direction
self.i = self.i + self.direction
self:outlet(2, "bang", {})
end
else
self:error("Unknown mode")
end
end
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