On Feb 10, 2015, at 11:23 , Jerry Krinock <je...@ieee.org> wrote: > > I’ve always wondered why, when you’re dragging a window around a non-Retina > screen, the anti-aliasing doesn’t show a “comb filter” kind of effect, with > different lines getting fuzzy and sharp as they are dragged on and off their > pixels. Looking at this closely today, I think the explanation may be that > > (1) Although you need to look carefully, Apple has constrained > dragging windows to “snap" to the grid of backing pixels. > You cannot move a window by one half pixel. > (2) A window’s intrinsic scrollers, title bars, etc. are also > on a 1-pixel grid. > (3) Any control or view that you place into Interface Builder > must be on a 1-pixel grid. I just tried entering a decimal > fraction, 139.5, and after I ended editing, it was rounded > down to 139.
Case #3 is actually points, not pixels. Cases #1 and #2 may be points, too, but I don’t know. Then there’s #1A and #3A — meaning: positioning those elements programmatically. Even though you can’t place a button off the 1-point grid in IB, you might be able to do it programmatically. Or not. Also, be careful about conceptualizing backing “pixels”. On an iPhone 6+, the backing store is 2x, but the hardware is 3x. (Let’s hope I got that the right way round.) Something similar is true of the Retina iMac/MacBook, too, though it’s complicated by having multiple logical resolutions. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
