Re: Can I draw directly to the screen?
Re: Can I draw directly to the screen?
- Subject: Re: Can I draw directly to the screen?
- From: "Corey O'Connor" <email@hidden>
- Date: Tue, 8 Feb 2005 10:24:51 -0800
You don't actually draw "directly" to the screen. You instead draw to
a borderless window with a transparent background. If the window is at
the frontmost layer and OS X handles the transparent background
correctly, then you can get all the features of drawing directly to
the screen with just drawing to a view like normal. Even OpenGL if the
system supports it. :-)
I'll see if I can't find some sample code I wrote a long while ago to
do this, but somebody else probably has more solid advice ;-)
-Corey O'Connor
On Tue, 8 Feb 2005 11:17:39 -0700, Fei Li <email@hidden> wrote:
>
> Hello all,
> I'd like to let user select a rectangle area on the screen, just like
> Apple's Grab under Applications\Utilities. When I select area on screen,
> seems I use mouse drawing a red rectangle directly to screen. In display's
> preference pane, in arrangement tab, when I select a screen, it draw a red
> frame around that screen, seems also draw directly to that screen. Usually I
> make drawings in custom view, but these two are quite different. If anyone
> know how Apple did these?
>
> Thanks for any information!
> Fei
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--
-Corey O'Connor
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