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What did you have to reverse engineer? Is it that hard to look in UIApplication and find acceleratedInX:Y:Z: ? And what does this have to do with ARM assembly?

Care to elaborate? I could never get the acceleratedInX:Y:Z: approach to work. What's the secret sauce?

It is, of course, very possible that I missed something trivial and could have saved lots of time :)

However, right now, I can only find two Google hits for 'acceleratedInX':

- a frustrated user over at http://code.google.com/p/iphonedoom/wiki/ControllerIdeas complaining about not getting it to work.
- your post (as grudgnor) over at the macrumors.com thread about this video, claiming the API is well-known and trivial to use.

Erling, I'm looking forward to your applications!!

I have a (very ugly) working app that uses acceleratedInX.

http://www.tokash.org/iphone/AccTest.zip

I just compiled my code, renamed AccTest to Hello and stuck it in the Hello.app folder. In fact, it's really just a stripped down version of the Hello World app.

Note: It did not work until Kroo on IRC (THANKS KROO!) told me that you have to launch from Launcher or SpringBoard. Apps launched from ssh cannot use acceleratedInX, for some reason, even if they subclass UIApplication.

Hi Erling,

In your main application code files (myApp.h and myApp.m), just override the acceleratedInX method, like this:

myApp.h:
@interface myApp : UIApplication {
}

- (void)acceleratedInX:(float)xTilt Y:(float)yTilt Z:(float)zTilt;

myApp.m:
#import "myApp.h"

@implementation myApp

- (void)acceleratedInX:(float)xTilt Y:(float)yTilt Z:(float)zTilt
{
// do something with the tilt values, like write them to a textView
//[_textView setText:[NSString stringWithFormat:@"%f,%f,%f",xTilt,yTilt,zTilt]];
}

@end

Obviously I cut out all of the code to setup the textview and window and stuff. I'm going to post my code for the simple moving ball app over at macrumors. This was my first ever Cocoa application (I'm a C# developer) so I was kind of weary about releasing it, especially because the collision detection never worked right.

John Tokash nailed it --- I tested my stuff from the command line, which is why I never got the simple acceleratedX thing to work.

Jeremy -- you don't need to re-declare the method in @interface -- your superclass did that.

What sample rate are you seeing with the UIKIt method? Some comments on YouTube claim that the sample rate for the accelerometer is too slow to do the bouncing-ball demo -- my method gives you the full 100hz if you want.

Nifty! It would be awesome if you could post some of the compiled apps you show in your video. I'm not too lazy to jailbreak my phone, but I'm definitely too lazy to write my own bobble head Steve Jobs.

I'd vote for the tilty maze - very cool. Slick piece of work.

Bored of iphone stories, move on now pleeeease

I wish someone would develop a UI where moving the Palm would navigate the menus (think : the ipod menus, instead of the click-wheel use the motion sensor, move the iPhone toward you to scroll down etc...). We could end-up with a 1 button navigation system! Unfortunately my programming skillz suck, even though I had the idea the first time I saw the motion sensor on a Mac...

Have you been able to access the Z (depth access) in any demo. For example to zoom in and out?

There's only one practical use for this technology: A lightsaber simulator!

Wuzzz, Fzzzz, Wuuummmm, Wum, Fzzz!

I can imagine using the quick jerk left/right to move between records in, say, the AddressBook, or back and forth through Safari's history. Up and down jerks could be a click on the scroll bar.

I think a version of "macsaber" for iPhone would be totally awesome. I love that app on my MacBook, but the computer is too hard to swing around.

here's Steve Strachan's light sabre (on a Nokia 5500) http://www.youtube.com/watch?v=qBAE1n9utSI

How about making a pedometer?

Would it at all be possible if you released the Bobble head Steve Jobs app along with the marbles bouncing and 3d maze? Those look like a lot of fun already!

Where and when i can download the Bobble head Steve Jobs app with the marbles bouncing and 3d maze???

Comment #2672.. jesus christ hilarious

good idea though :)

When is the release of the marbles bouncing and 3d maze??? 1 month and nothing released in pxl repository!??

hi, i'd installed the game "balls" from the iPhone installer but then i start get weired reaction when i try to scroll in the main page (the page we get when we press the home button) and just in the main page.
would you please tell me what the reason may be? And how can i solve it?
thanks

[Erling says: Read the note at the top of the page. I have nothing to do with the "balls" application.]