Slava,
Calculating an optimal vertical layout is pretty involved. At least,
the Cocoa Text System has sophisticated logic to determine the ideal
layout because of the numerous and varying design target for different
fonts.
For example, as you found out, many fonts designed in 80s have pretty
tight ascent and zero leading.
Modern Asian fonts tend to have enormous leading (30 ~ 40% of ascent +
descent).
The Text System encapsulates the logic to determine the ideal layout.
It's not just queried from a font instance. It requires the context
of an entire line.
If NSTextView is too abstract for your needs, you could use
NSLayoutManager.
If NSLayoutManager proved to be still too abstract, you can integrate
NSATSTypesetter into your text rendering engine.
NSATSTypesetter taps into the power of CoreText and still provides
additional abstraction and functionalities (attachment, all the
NSParagraphStyle attributes, etc).
Aki
Is there a way to compute what the default leading would be for a
font? This is for a Mac OS backend of a cross-platform GUI toolkit, so
I can't really just use NSTextView here.
Slava
On Fri, Feb 13, 2009 at 9:16 PM, Graham Cox <graham....@bigpond.com>
wrote:
Line spacing (or to be more precise, leading) is an attribute of the
paragraph style. This is added to the lineheight of the font as you
have
calculated.
--Graham
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