Book Image

jQuery Game Development Essentials

By : Selim Arsever
Book Image

jQuery Game Development Essentials

By: Selim Arsever

Overview of this book

jQuery is a leading multi-browser JavaScript library that developers across the world utilize on a daily basis to help simplify client-side scripting. Using the friendly and powerful jQuery to create games based on DOM manipulations and CSS transforms allows you to target a vast array of browsers and devices without having to worry about individual peculiarities."jQuery Game Development Essentials" will teach you how to use the environment, language, and framework that you're familiar with in an entirely new way so that you can create beautiful and addictive games. With concrete examples and detailed technical explanations you will learn how to apply game development techniques in a highly practical context.This essential reference explains classic game development techniques like sprite animations, tile-maps, collision detection, and parallax scrolling in a context specific to jQuery. In addition, there is coverage of advanced topics specific to creating games with the popular JavaScript library, such as integration with social networks alongside multiplayer and mobile support. jQuery Game Development Essentials will take you on a journey that will utilize your existing skills as a web developer so that you can create fantastic, addictive games that run right in the browser.
Table of Contents (17 chapters)
jQuery Game Development Essentials
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Using device orientation


In some situations, it can be useful to have access to the device orientation. For example, you can use it to control the avatar's movement. To do this, you can simply register an event handler that will receive an event each time the device orientation changes. The following code does exactly that:

if(window.DeviceOrientationEvent) {
  window.addEventListener("deviceorientation", function(event){
    var alpha = event.alpha;
     var beta = event.beta;
     var gamma = event.gamma;
     // do something with the orientation
  }, false);
}

The first if statement is there to check whether the device supports the device orientation API. Then we register an event handler that accesses the orientation of the device. This orientation is provided by three angles: alpha is the rotation around the z axis, beta is the rotation around the x axis, and gamma is the rotation around the y axis.

You already know what the x and y axes are; they are the same that we used to position...