What are the different options for flipping the coordinates of the
destination view? I've tried doing it by scaling and translating the
CGContext, but this results in problems with underlining or the
character orientation (depending on whether i flip the view back
before or after drawing the text).
At the moment the only method which results in correct text is to have
a custom view and override isFlipped - is this the only recommended
method?
I ask because I have to use these strings within custom views (which
may for example have rotated contexts), as well as in standard
controls, and simpler custom views purely for drawing these attributed
strings. If the only method to have the attributes (particularly
underline) interpreted correctly is to perform the drawing in a
isFlipped NSView subclass, then I need to rejig things so the complex
custom views embed an NSView rather than draw the attributed string
manually.
thanks
Rua HM.
On Nov 19, 2008, at 9:40 am, 11(November)/19/08, Rua Haszard Morris
wrote:
Thanks for the link, you are right, I had not seen that document!
On Nov 19, 2008, at 9:33 am, 11(November)/19/08, Douglas Davidson
wrote:
On Nov 18, 2008, at 12:18 PM, Rua Haszard Morris wrote:
To follow up.. below I have pasted the code that draws the text
(for my test app, as opposed to the more complex ways of
reproducing the bug elsewhere in my code). (the full test app is
attached to the radar bug)
I have been consulting the Text System Overview documentation,
which I don't believe mentions this fact.
http://developer.apple.com/documentation/Cocoa/Conceptual/TextArchitecture/TextArchitecture.html
I can understand that drawing text top to bottom makes sense, but
I am surprised that the coordinate system of the destination
context has such far-reaching side effects.
You're looking at the Text Systems Overview, which is very general
conceptual documentation, the sort you would consult to decide
which class to use. What you want is the Text Layout Programming
Guide for Cocoa, which gives more detailed direction as to how to
use these classes. The first section, http://developer.apple.com/documentation/Cocoa/Conceptual/TextLayout/Concepts/LayoutManager.html
under the heading "Glyph Drawing" says, "The text system expects
view coordinates to be flipped, like those of NSTextView." If you
are going to be drawing using the layout manager directly, this is
a hard-and-fast rule.
Douglas Davidson
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