Re: Getting exact height of NSAttributedString
Re: Getting exact height of NSAttributedString
- Subject: Re: Getting exact height of NSAttributedString
- From: Ricky Sharp <email@hidden>
- Date: Fri, 21 Apr 2006 17:13:49 -0500
On Apr 21, 2006, at 3:48 PM, Ivan Kourtev wrote:
On Apr 21, 2006, at 4:16 PM, Ricky Sharp wrote:
On Friday, April 21, 2006, at 02:58PM, Ivan Kourtev
<email@hidden> wrote:
To me, the boundingRectWithSize:options: method is still completely
incomprehensible as well (not to mention that its documentation
omits
important details).
I settled for the size method. The only "complaint" I have is that
size: seems to return a bounding box that will accommodate glyphs
extending below and much above the baseline (even if such glyphs are
not present). So in other words, it seems to me that size will
return the about the same bounding box (at least in the vertical
direction) for "cara" as it will for say 'Agap'
This is a good thing. I currently use size to vertically center
text in custom controls/views. Not all strings will have acenders/
decenders, so it's important that they will have their centers all
vertically aligned.
I knew that. I don't use these methods very often but always
wondered - how do you tell where the baseline is?
See <http://developer.apple.com/documentation/Cocoa/Conceptual/
FontHandling/Tasks/GettingFontMetrics.html>
which is also referred by Andreas Mayer's cool site:
<http://www.harmless.de/cocoa.html#fontmetrics>
Say you invoked size: and it gave you a certain box as a result and
the string in question doesn't have any ascenders. If you wanted
to line it up, how do you tell where the baseline is? Or am I
thinking the wrong way about it (and one should never have to line
up their own strings but leave this job to the text view)?
You really don't have to worry about the baseline at all in this
case. The letters lowercase-a, lowercase-y, and uppercase-e-acute
will physically appear to have different heights, but their bounding
box for a given font (face, size, etc.) will be the same. So just
line up the bottom/top edges of those boxes and your text will render
correctly.
___________________________________________________________
Ricky A. Sharp mailto:email@hidden
Instant Interactive(tm) http://www.instantinteractive.com
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden