LÖVE

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--[[

timer.lua by Almia

a library that handles periodic or delayed execution of functions
via virtual timers.

Timers has a minimum of 32 executions per second.
--------------------------------------------

	API
	
	timer.start(timeout, doReset, handler)
		- starts a timer
			*timeout - how often the timer executes handlers
			*doReset - does the timer executes again?
			*handler - the initial handling function that
						is executed every time the timer expires.
	
	timer:pause()
		- pauses the timer
	
	timer:resume()
		- resumes the timer
		
	timer:setTimeout(timeout)
		- changes/sets the timer's timeout
		
	timer.update(dt)
		- must be put inside the love.update, also having the love.update's dt
]]--
MIN_TIMEOUT = 0.031250000 -- 32 frames
timer = {}
timer.__index = timer
local timers = {}

function timer.start(timeout, doReset, handler)
	if type(timeout) == "number" then
		if timeout <= MIN_TIMEOUT then
			timeout = MIN_TIMEOUT
		end
	else
		timeout = MIN_TIMEOUT
	end
	
	local new = {active = true,
				 timeout = timeout,
				 doReset = doReset,
				 handler = handler,
				 prev = love.timer.getTime()}
	table.insert(timers, new)
	setmetatable(new, timer)
	return new
end

function timer:pause()
	self.active = false
end

function timer:resume()
	self.active = true
end

function timer:setTimeout(timeout)
	if timeout <= MIN_TIMEOUT then
		timeout = MIN_TIMEOUT
	end
	if self.active then
		self.prev = love.timer.getTime()
	end
	self.timeout = timeout
end

function timer.update()
	dt = love.timer.getTime()
	for k, t in ipairs(timers) do
		if t.active then
			if dt - t.prev >= t.timeout then
				t.handler()
				if t.doReset then
					t.prev = dt
				else
					t.pause()
				end
			end
		end
	end
end

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require "timer"
function love.load()
	local t = 0.031250000
	text = {}
	for i = 1,32 do
		text[i] = 0
		timer.start(t, true, function ()
			text[i] = text[i] + 1
		end)
		t = t + MIN_TIMEOUT
	end
end

function love.update()
	timer.update()
end

function love.draw()
	local y = 0
	local yg = 600/32
	for i = 1, 32 do
		love.graphics.print((33 - i).." frames : "..text[i], 100, y)
		y  = y + yg
	end
end

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function love.update (dt)
   timer.update(dt)
end

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dt = love.timer.getTime()