Comments on: Flash Rotation Bug (with Fix)

By: Jared

Jared — Tue, 22 Sep 2009 00:57:15 +0000

Thanks so much for posting this. Yours was the ONLY link describing this issue that google pulled up, and if it weren’t for you guys, I would never have known what was causing my flash to break.

Thanks, Jared

By: Use Modulo for Box2D Rotation | Manfred Weber`s Weblog

Use Modulo for Box2D Rotation | Manfred Weber`s Weblog — Mon, 21 Jul 2008 22:32:42 +0000

[...] also posted more details about this bug. The solution is simple: Use modulo within the enterFrameHandler to assign proper [...]

By: Pixelwit

Pixelwit — Mon, 21 Apr 2008 20:56:57 +0000

@Ophi, If rotation is a signed “integer”, wouldn’t that mean _rotation doesn’t hold fractional values? I’m pretty sure _rotation can be set to decimal values like 22.5.

By: Ophi

Ophi — Mon, 21 Apr 2008 17:44:43 +0000

Hi. 32767 is the max number of the signed integer type. (2 bytes, with first bit for the sign). I think _rotation is simply a signed integer going from -32768 to 32767. So when you try to assign it a value greater than 32767, all the bits don’t fit into this signed integer, and so there is the bug. To avoid that, you must increment _rotation and not count.
_rotation+=361
(flash will implicitely do the trick)
Hey, works fine with AS2

By: Pixelwit

Pixelwit — Tue, 26 Feb 2008 12:59:55 +0000

Sorry Laurence, I haven’t a clue. Using modulo should yield results like “358, 359, 0, 1, 2″ not “358, 359, 360, 0, 1, 2″, if that helps at all.