‘Cut the Rope’ HTML5 JavaScript Preloader

Screenshot of Cut the Rope HTML5 Javascript web appDevelopers from the popular iPhone game Cut the Rope and a crack team of HTML5 gurus from PixelLab, have developed an awesome JavaScript version that runs inside most modern web browsers using JavaScript and a number of powerful HTML5 features such as canvas and media APIs. You can find out how they did it from the behind-the-scenes video they’ve posted.

One of the interesting snippets from the dev blog is that the group behind the creation of the app have released an open-source preloader for JavaScript apps called PxLoader. It supports some extremely useful features such as being able to load in your canvas images in groups, use progress bars, get callbacks when various groups have loaded and supports a plug-in architecture so you can load in sounds too. It’s released under a fairly liberal MIT license and the PxLoader source is available on GitHub.

Image loading in Groups

A good example is using it in an HTML5 game to load menu sprites before actual game sprites since you would want the menu to display and load first. PxLoader can also provide progress updates to many listeners and will scope the updates and statistics to only the set of “tags” a listener is interested in, a tag being the text name of that group.

You can play with a working example of the group image loading on the PxLoader homepage (Sample 3).

Reverting your library from a beta of iTunes

As an iPhone and iPad developer, Apple often present you with beta versions to install which sometimes require you to also install a beta version of iTunes. Of course the contents of these beta versions are under strict non-disclosure agreements but the process of rolling back isn’t so I’ll quickly explain how to do it…

When you installed the beta, it will upgrade your iTunes library database but if you try to downgrade back to the old version at a later date you’ll be presented with an error message saying that iTunes cannot read your library.

Don’t panic! The beta version has just moved your library database to a backup folder and with a simple drag and drop you can have your old library database up and running again. Your old database should be found in ~/Music/iTunes/Previous iTunes Libraries dated with when you upgraded. Just drag that back into ~/Music/iTunes renaming it to iTunes Library.itl (you’ll probably need to delete the existing iTunes Library.itl file too as that belonged to the beta version and you just uninstalled that).

That’s all you need to do to get your old iTunes library working again. Just before you begin make sure you back up everything!

WWDC Update: 5 key points for iPhone apps

It’s now been just over 3 weeks since the torrent of information unleashed at Apple’s World Wide Developer Conference refreshingly drenched the brains of designers, developers and engineers. I’ve resisted blogging about the public announcements to fully let the impact soak in and gage everyone’s reactions but now feels like a good time to talk about where the future of computing is heading.
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Calculating UNIX file permissions

Permissions Mac AppA few years ago I wrote a simple but handy Mac app that calculates unix file permissions using a matrix of check boxes. I wrote it because I wanted to better understand how those octal values get calculated and to expand my experience of writing Mac apps.

I was also learning some crazy assembly code at the time too so I was also making sense of putting bitwise operations to task. Rather than let this code languish on my hard drive, I thought I’d share…
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Pub Darts now with Facebook Support

Richard Warrender's photo in Pub DartsHey, just to let you know Pub Darts 1.2 is now up in the App Store.

The biggest feature this new version supports is Facebook integration. Yes thats right… you can now log in and pull a “friend’s” profile picture straight onto the dartboard ready to let off some steam. Mmm, now if only you could download and try it out for free… wait you can because I made it free for a short while!
Here’s the link for Pub Darts.

So what else is in this free update?
Well I’ll tell you. This is what some people have been begging me for…

  • Ability to refresh dartboard
    (You can now remove the tiny dart holes)
  • Dart sound effects
    (Satisfying thuds as a dart hits the board – woop!)
  • Bug fixes related to using camera and albums
    (Needed fixing particularly for large images)

Just in case you can’t find it, to access Facebook navigate to…
Settings > Boss Image > Camera > Grab From Facebook

Let me know what you’d like to see in the next update. Either in the comments or an email. Of course, you could always leave a really positive review if you enjoy it 😀