Re: pls explain rotated iPhone coordinates to me
Re: pls explain rotated iPhone coordinates to me
- Subject: Re: pls explain rotated iPhone coordinates to me
- From: Luke the Hiesterman <email@hidden>
- Date: Tue, 15 Dec 2009 11:29:16 -0800
You should probably post a sample project which demonstrates this.
Luke
On Dec 15, 2009, at 9:09 AM, Matt Neuburg wrote:
> On or about 12/15/09 7:00 AM, thus spake "Luke the Hiesterman"
> <email@hidden>:
>
>> should be using a rect based on the bounds
>
> Okay, but things are still reversed from the way I naively think they should
> be. Just consider this code alone (I've moved everything into the view's
> controller):
>
> UIScrollView* sv = (UIScrollView*)self.view;
> CGRect f = self.view.bounds;
> sv.contentSize = CGSizeMake(f.size.height * 2.0, f.size.width);
>
> Now, what I'm trying to do is make the content twice as *wide* as the scroll
> view, so that I "page" from side to side, in this landscape-oriented app.
> And I am succeeding in doing so!
>
> The question is: why? As you can see from the code, I'm finding that I have
> to take my bounds and use its *height* as my content size's *width* (and
> double it, in order to get my two-page setup) and its *width* as my content
> size's *height*. But why *is* that? The scroll view *is* rotated (i.e. I'm
> not merely holding the iPhone sideways; things drawn in the scroll view in
> IB with the view rotated are appearing correctly in the running app) so
> shouldn't width mean width?
>
> My code works perfectly, I just want to understand why. Does rotation not
> really mean rotation? Am I supposed to manually apply a coordinate transform
> that the docs have failed to warn me about? I did the three things we are
> asked to do here:
>
> <http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/i
> PhoneOSProgrammingGuide/ApplicationEnvironment/ApplicationEnvironment.html#/
> /apple_ref/doc/uid/TP40007072-CH7-SW18>
>
> m.
>
> --
> matt neuburg, phd = email@hidden, http://www.tidbits.com/matt/
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>
>
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