September 2012
Intermediate to advanced
552 pages
14h 48m
English
Content preview from Professional HTML5 Mobile Game Development
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Trying Out Device Orientation
To try out the device orientation events, you can build a quick demonstration using the SVG and physics code from Chapter 14, “Building Games with SVG and Physics.” Figure 24-1 shows the end result.
Figure 24-1: The final device orientation example.
The demonstration consists of a set of static walls enclosing a set of balls that can react to gravity. Gravity always stays consistent with reality, but as you rotate the device, gravity changes relative to it, which will cause the balls to fly around the screen.
Creating a Ball Playground
To start, create a new HTML file called orient.html with the contents of Listing 24-1. You need a number of quintus files and the engine’s dependencies along with Box2dWeb-2.1.a.3.js from Chapter 14.
Listing 24-1: The orientation example HTML file
<!DOCTYPE HTML> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0"/> <title>DeviceOrientation</title> <script src='js/jquery.min.js'></script> <script src='js/underscore.js'></script> <script src='js/Box2dWeb-2.1.a.3.js'></script> <script src='js/quintus.js'></script> <script src='js/quintus_input.js'></script> <script src='js/quintus_sprites.js'></script> <script src='js/quintus_scenes.js'></script> <script src='js/quintus_physics.js'></script> <script src='js/quintus_svg.js'></script> ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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