Book Image

Corona SDK Mobile Game Development: Beginner's Guide

Book Image

Corona SDK Mobile Game Development: Beginner's Guide

Overview of this book

Corona SDK is the fastest and easiest way to create commercially successful cross platform mobile games. Just ask Robert Nay, a 14 year old who created Bubble Ball - downloaded three million times, famously knocking Angry Birds off the top spot. You don't need to be a programming veteran to create games using Corona. Corona SDK is the number one tool for creating fun, simple blockbuster games. Assuming no experience at all with programming or game development you will learn the basic foundations of Lua and Corona right through to creating several monetized games deployable to Android and Apple stores. You will begin with a crash course in Lua, the programming language underpinning the Corona SDK tool. After downloading and installing Corona and writing some simple code you will dive straight into game development. You will start by creating a simple breakout game with controls optimized for mobile. You will build on this by creating two more games incorporating different features such as falling physics. The book ends with a tutorial on social network integration, implementing in app purchase and most important of all monetizing and shipping your game to the Android and App stores.
Table of Contents (18 chapters)
Corona SDK Mobile Game Development Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface

Time for action – making the egg drop


We're going to execute the timer for the egg so they can start dropping them on the screen.

  1. Create a local function called eggTimer() and use timer.performWithDelay to drop an egg every 1 second (1000 milliseconds) repeatedly. Use eggDrop() to activate the drop.

        local eggTimer = function()
          startDrop = timer.performWithDelay( 1000, eggDrop, 0 )
        end
  2. Within the first if statement in the onEggCollision() function, cancel the timer using the timerID, startDrop. Add the statement if gameLives < 1 to stop the eggs from falling.

          if gameLives < 1 then
            timer.cancel( startDrop )
            print("timer cancelled")
          end

What just happened?

In order for the eggs to start dropping from the sky, we created a function called eggTimer(). It activates the eggDrop() function by letting an egg drop after 1000 milliseconds (1 second) every time infinitely using startDrop = timer.performWithDelay( 1000, eggDrop, 0 ).

Backtracking to onEggCollision...