Countdown timer

tytadas · August 2016

http://giderosmobile.com/tools/countdown

This is the code to create countdown timer. I'm doing everything like in the example, but this line local cd = Countdown.new({ and showing me error : "attempt to index global 'Countdown' (a nil value)"
Yes and I have created Countdown.lua file.

I believe I'm not the only with this error, maybe Countdown method doesn't work anymore and theres a different function to call countdown timer?

antix · August 2016

Have you downloaded and run the example from the github repo? I downloaded it all and it works. If you are just doing this from your own code then maybe you aren't creating the Countdown instance?

May I also ask what you are trying to achieve with the countdown class? Do you just need a simple second countdown or is it something more complicated?

tytadas · August 2016

I just need 10 seconds countdown on the screen, and after 10 seconds , it should display "Happy Birthday"

tytadas · August 2016

I tried to create my own code because I have started reading a PIL book, but nop, not enough experience yet. I'll try to download now

tytadas · August 2016

Somehow It still doesnt work for me.. I'll try to recheck it

antix · August 2016

@tytadas using that class for a simple 10 second countdown might be a bit like trying to kill an ant with a sledge hammer

Maybe you might try this small class instead..

--[[
 
name:   CountDown
vers:   1.0.0
desc:   A simple counter that counts down to 0 and runs a function on completion.
auth:   by Cliff Earl, Antix Software
date:   August 2016
legal:  Distribute freely but please leave my credits intact.
 
--]]
 
CountDown = Core.class(Sprite)
 
function CountDown:init(options) -- Setup counter
 
  local props = { -- Default options
    x           = 16,
    y           = 16,
    scale       = 1,
    alpha       = 1,
    color       = 0x000000,
    font        = nil,
    duration    = 10,
    onComplete  = nil,
  }
 
  if options then
    for key, value in pairs(options) do
      props[key]= value
    end
  end
 
  self. countingDown = false
  self.counter = 0
 
  local text = TextField.new(props.font, props.duration) -- Create text
  text:setTextColor(props.color)
  self:addChild(text)
 
  self:setPosition(props.x, props.y) -- Position, etc
  self:setScale(props.scale)
  self:setAlpha(props.alpha)
 
  self.props = props
  self.text = text
end
 
function CountDown:start() -- Start the counter
  local props = self.props
  self.counter = props.duration + 1
  self:show(true)
  self.countingDown = true
end
 
function CountDown:setDuration(duration) -- Set duration of counter
  local props = self.props
  props.duration = duration
end
 
function CountDown:show(state) -- Show or hide counter
  self:setVisible(state)
end
 
function CountDown:updateText() -- Update the counter text
  local text = self.text
  local counter= math.floor(self.counter)
  text:setText(counter)
end
 
function CountDown:update(dt) -- Call this every frame
 
  if not self.countingDown then return end -- If not running then just exit
 
  local counter = self.counter - dt -- Decrement counter
 
  self:updateText() -- Update the text
 
  if counter <= 1 then -- Has counter run down?
 
    self.countingDown = false -- stop any further counting down
    self:show(false) -- Hide ourselves
    if self.props.onComplete then
      self.props.onComplete() -- Call function when the count down reaches 0
    end
 
  end
  self.counter = counter
 
end

Here's an example of how it can be used..

local counter = CountDown.new( {
    x           = 64,
    y           = 64,
    scale       = 5,
    alpha       = 1,
    color       = 0x000000,
    font        = nil,
    duration    = 15,
    onComplete  = function() -- This function gets run when the timer gets to zero
      print("complete")
    end,
  } )
 
  stage:addChild(counter)
  counter:start()
 
local function update(e) -- Enter Frame Event
  local dt = e.deltaTime
 
  counter:update(dt) -- Update counter
 
end
 
stage:addEventListener(Event.ENTER_FRAME, update)

tytadas · August 2016

@antix Wow man, you Da real MVP! Thank you for this sample! I will leave the credits! Really thanks! Works as well as Perwoll!

antix · August 2016

You're welcome

keszegh · August 2016

this deltaTime property of the event is undocumented, isn't it? nice one.

antix · August 2016

I think there's some mention of it in the reference, that's where I came across it. It's a pretty handy var

simwhi · August 2016

@antix Nice one!. I might use this, too.

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