SOLVED: Front and back flip animation

FROM : Geert B. Clemmensen
DATE : Tue May 20 21:19:21 2008

Hello,

I finally got this to work the way I wanted to. The main trick is that 
for a layer associated with a view (setWantsLayer:YES) the anchorPoint 
is (0, 0). Apple's CALayer documentation states that the anchorPoint 
(0.5, 0.5), but alas, this isn't the truth in all cases.

The final pieces of the puzzle came around when I earlier today 
stumbled on MFFlipController done my Mike Lee (http://boondoggle.atomicwang.org/lemurflip
). It took me a few minutes assembling the X-code project, but after 
that it was smooth sailing. I would say that, for my specific purpose, 
Mike's example is by a good margin better that anything I've found on 
Apple's site. Thx. Mike.

Kind Regards,
Geert B. Clemmensen


Begin forwarded message:

> From: "Geert B. Clemmensen" <<email_removed>>
> Date: 15. februar 2008 10.52.25 GMT+01:00
> To: Cocoa Developers <<email_removed>>
> Subject: Front and back flip animation
>
> I would like to implement a switch between two views, each with 
> their own set of controls etc., so the switch animates like when you 
> click on the small "i" on a widget, i.e. the concept of a front and 
> a back. The animation should flip the views around a vertical axis 
> in the middle of their frame. I've looked at the ViewFlip and 
> GeekGameBoard examples (and many others) and kinda have things 
> working, but it is not quite what I want. I would like to solicit 
> opinions on what the best strategy is. The ViewFlip uses 
> CATransform3DMakeRotation, but that isn't ideal as described in the 
> GeekGameBoard example. The GeekGameBoard uses CALayer and not 
> NSViews, so I'm unsure how to change the example to what I need.
>
> One approach I've considered is to add an animation to the parent 
> view ("subviews" property) so it moves and resizes the view. Let's 
> say that the views are 200x400 and with frameOrigin at 0,0. Would it 
> then make sense to have the front animate from ((0,0),(200,400)) to 
> ((100,0),(0,400)) and the reverse for the back (assuming doubleSided 
> is NO)?
>
> Is there a much better and obvious way, once you've seen the 
> light :o), to achieve the front/back flip animation?
>
> Kind Regards,
> Geert B. Clemmensen
>