Re: Problem: how to get glyph descent and ascent
Re: Problem: how to get glyph descent and ascent
- Subject: Re: Problem: how to get glyph descent and ascent
- From: Quincey Morris <email@hidden>
- Date: Tue, 23 Jun 2009 11:02:39 -0700
On Jun 23, 2009, at 10:32, Anders Lassen wrote:
I am working on a project that involves writing math formulas.:
2 * x^2 + sqrt(3)
--------------------- + aB
3
note that the above is only to explain, what I mean by math formulas.
In my project, I have a object type that handles letters. Because
letters must be aligned to special math symbols I need to know the
ascent and descent of the character.
But maybe, I have now found a way to do this, although it is not
tested yet.
I hope that the function:
ATSUGetUnjustifiedBounds
will help me.
It sounds like you want the glyph bounding boxes -- "glyph ascent" is
not really a standard term like "font ascent", so it could mean one of
several possible metrics. I tried searching developer.apple.com for
"glyph metrics" and the second hit was this tech note:
http://developer.apple.com/technotes/tn/tn2033.html
which explains how to get glyph metrics (include glyph bounding boxes)
using ATSUI. The 19th hit was:
http://developer.apple.com/documentation/Carbon/Reference/CTFontRef/Reference/reference.html#/
/apple_ref/c/func/CTFontGetBoundingRectsForGlyphs
which explains how to get the same information using Core Text.
Is that the information you need?
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