Re: Core Animation geometry, layer hosting, and resolution independence
Re: Core Animation geometry, layer hosting, and resolution independence
- Subject: Re: Core Animation geometry, layer hosting, and resolution independence
- From: Jens Alfke <email@hidden>
- Date: Wed, 12 Mar 2008 15:35:35 -0700
On 12 Mar '08, at 2:49 PM, Nathan Vander Wilt wrote:
I don't understand what this "base" coordinate system
is (not the window's, otherwise the conversions would
likely be offset by the view's position therein,
right?). But whatever it is, it seems to be shared by
the CALayer.
The Cocoa Drawing Guide, under "Pixel-Exact Drawing", says:
"These convenience methods make it possible to convert values to and
from the base (device) coordinate system. They take into account the
current backing store configuration for the view, including whether it
is backed by a layer."
In a layer-backed NSView, it seems that the 'device', aka backing
store, is the view's CALayer; so these methods will convert to/from
the layer's coordinates.
I'll go update GeekGameBoard now...
—Jens
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