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Re: advancementForGlyph problem

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Re: advancementForGlyph problem

Subject: Re: advancementForGlyph problem
From: Dale Miller <email@hidden>
Date: Fri, 30 Apr 2010 09:37:08 -0700

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.

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.

The Application Services Framework provides a couple of functions for drawing glyphs that give you explicit control over advancement: CGContextShowGlyphsWithAdvancements and CGContextShowGlyphsAtLocations.

Dale Miller
email@hidden


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