Book Image

Corona SDK Mobile Game Development: Beginner's Guide

By : Michelle M Fernandez
Book Image

Corona SDK Mobile Game Development: Beginner's Guide

By: Michelle M Fernandez

Overview of this book

Table of Contents (19 chapters)
Corona SDK Mobile Game Development Beginner's Guide Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

The value of timed functions


Using a function that can be called at a later time can be helpful when organizing the timing of your game objects' appearance in an application. The timer library will allow us to handle our functions in a timely manner.

Timers

The timer function enables you to trigger events at a specific delay (in milliseconds) of your choosing.

  • timer.performWithDelay(delay, listener [, iterations]): This invokes the listener after a delay in milliseconds and returns a handle to an object that you can pass to timer.cancel() in order to cancel the timer before it invokes the listener. For example:

    local function myEvent()
      print( "myEvent called" )
    end
    timer.performWithDelay( 1000, myEvent )
  • timer.cancel(timerId): This cancels a timer operation initiated with timer.performWithDelay(). The parameter is as follows:

    • timerId: This is an object handle returned by the call to timer.performWithDelay(). For example:

      local count = 0
      
      local function myEvent()
        count = count + 1
        print...