date:20090618

Re: Group CGAffineTransform Animations?

2009-06-18 Thread Chunk 1978

thanks to everyone for your input.  i've learned quite a lot!  an
interesting topic indeed :).  thanks again.

On Thu, Jun 18, 2009 at 1:45 AM, WT wrote:
> Hi David,
>
> On Jun 18, 2009, at 12:42 AM, David Duncan wrote:
>
>> Your solution works because you've scaled the coordinate system, so the
>> translation needs to be scaled too (to get the change specified by the
>> translation).
>
> Yes, that was the point I was trying to make on earlier posts, though in a
> confusing way. My intuition was correct but I was too tired to understand
> why. It's actually rather simple. A scaling is like changing the size of
> your ruler or meter-stick (a smaller ruler produces larger lengths, so the
> object you're measuring appears bigger, and vice-versa). The problem is,
> though, that changing your ruler also changes how far you travel when you
> apply a translation (changing your ruler *is* changing the scale of your
> entire coordinate system). Thus, if you scale up, you also travel more, and
> if you scale down, you travel less, and always by the same factor. So, in
> order to travel the correct distance *and* make your object have a different
> size, you need to divide the translation offset by the scale of your
> scaling. The translation offset, of course, has to be the correct one, and
> that was a vector from the object's center to the center of the screen.
>
> I am a bit confused now by something you said, though.
>
>> The issue with a translation is that it starts to confuse your
>> expectations of the relationship between a view's center and the view's
>> frame, because the center isn't altered by the transform, only the frame is.
>> This is also why I recommend not using translations as part of your
>> transform if they are not necessary, because then you look at the center of
>> the view and you discover that it hasn't actually moved, yet your view is
>> clearly not where it was before you set the transform.
>>
>> Of note at this point is that the view's center is in its super view's
>> coordinate system, while the view's bounds is in its own coordinate system
>> (and thus the origin is usually, but need not be, CGPointZero).
>
> If the center is in the superview's coordinate system, how can it not be
> changed by a translation? In the view's own coordinate system, yes, I can
> see that that's true, because then the center is half-way the bounds' width
> and height, and those don't change under a translation.
>
> Wagner
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Re: Problem with capturing active state of the application

2009-06-18 Thread Srinivasa Prabhu

Thanks Andrew.

We looked into the link.

However if our application is not active and the user enters the
selection capture mode using Hot Keys, how do we capture the
active state of close, minimize, zoom, scroll buttons of the
application currently on screen?

Since we put up a transparent window to handle the selection drawing,
we have to activate our application to receive mouse and key events.

Because of this the previously active application gets deactivated.

Is there any workaround for this?

Regards,
Srinivas
On Jun 18, 2009, at 11:49 AM, Andrew Farmer wrote:

On 17 Jun 2009, at 22:49, Srinivasa Prabhu wrote:
In our application we want to capture a selected area similar to
Apple's Cmd+Shift+4 i.e
during selection capture, the active state of another application
has to be captured.

...
Is there any workaround to capture the active state of the
applications?

Yes: CGWindow.

http://developer.apple.com/documentation/Carbon/reference/CGWindow_Reference/Reference/Functions.html#/
/apple_ref/doc/uid/TP40008073-CH2-DontLinkElementID_53

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