On Apr 30, 2010, at 10:37 AM, Dale Miller wrote: > For character measurements, if you are using the Cocoa text system, use the > font returned by the NSLayoutManager method "subtituteFontForFont:" in order > to get the screen font used by Cocoa text. However, experimentally, I found > that for font sizes greater than 17, non-integral values are still returned. > I've not found any documentation as to how Cocoa text (or Quartz text or > CoreText) arrive at the values they actually use.
Dale -- Thanks for responding. "substituteFontForFont:" didn't fix my problem, but I'm glad you brought font substitution to my attention. One more thing I need to keep my eye on. > If you're not using Cocoa text, you will have to do some rounding to integral > values: e.g. floor(value+0.5) or truncating: floor(value). Experimentally, > Cocoa text seems to use rounding for advancement, and truncation for line > height, at least with the fonts/sizes I've tried. I would be perfectly happy truncating the advancement (despite the tighter kerning it would give me). > The Application Services Framework provides a couple of functions for drawing > glyphs that give you explicit control over advancement: > CGContextShowGlyphsWithAdvancements > and CGContextShowGlyphsAtLocations. Hmmm. I'll have to give those functions a look. Do they handle strikethrough/underline? David_______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
