> Message: 1
> Date: Sat, 22 Feb 2020 14:24:40 +0100
> From: Gabriel Zachmann <z...@cs.uni-bremen.de <mailto:z...@cs.uni-bremen.de>>
> To: "cocoa-dev@lists.apple.com <mailto:cocoa-dev@lists.apple.com>"
> <cocoa-dev@lists.apple.com <mailto:cocoa-dev@lists.apple.com>>
> Subject: Confusion about screen resolution
> Message-ID: <df9b25cc-4215-4360-a365-8c6f82195...@cs.uni-bremen.de
> <mailto:df9b25cc-4215-4360-a365-8c6f82195...@cs.uni-bremen.de>>
> Content-Type: text/plain; charset=us-ascii
>
> When my screensaver gets invoked by the screensaver engine, it calls
> - (id) initWithFrame: (NSRect) frameRect isPreview: (BOOL) preview
>
> Funny thing is, when I print the frameRect to the log, I get 1680 x 1050.
> But my laptop screen really has 2880 x 1800! (That's what I get from "About
> this Mac")
>
> I am running under Catalina 10.15.3.
>
>
> Can any one please shed some light on this?
>
> Thanks a lot in advance.
> Gab.
>
Gab,
I think you are confusing pixels and points.
A pixel is an addressable light-emitting area on the screen. Your screen
contains 2880 X 1800 pixels.
But a typographical point is a unit of distance. There are 27 points per inch.
(I.e., a typographical point is 0.0139 inches or 0.353 mm).
Recalling that screen sizes are measured diagonally, the diagonal of a 1680pt
X 1050pt rectangle is 1981pt (or 27 inches). I conclude that your Mac has a
27-inch screen at a resolution of 123 X 123 px/in.
Cheers,
Rick Aurbach
8233 Tulane Avenue
St. Louis, MO 63132
eMail: rla...@icloud.com
Phone: 314/721-7987
H-A-R-D-W-A-R-E
(noun)
“The part of a computer you can kick."
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