True, you can do the affine transform, but that doesn't cover all cases of alternate glyphs that should be used for different scripts in different directions. It also doesn't really alter the way the cursor appears or how input methods appear. For many languages, this becomes a complicated user experience problem to tackle and should be added to the frameworks in the long run. So the short version is you may end up needing to muck about in the layout manager and CoreText itself. Can be quite the rabbit hole.
On Feb 4, 2011, at 1:28 AM, Shawn Bakhtiar wrote: > > > http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSAffineTransform_Class/Reference/Reference.html > > NSAffineTransform? > > If you read the Drawing and Graphics documents on the developer website, they > talks about the view, its bounding box, and how to achieve ANY transformation > you need. This is 101 Linear algebra stuff, it doesn't matter where the > origin is, (in our limited case) there is some matrix which can transform you > to any other space you want/need, and it is doable using the > NSAffineTransform. > > > From: dangerwillrobinsondan...@gmail.com > > Date: Thu, 3 Feb 2011 23:58:46 +0900 > > To: witness.of.teacht...@gmx.net > > CC: Cocoa-dev@lists.apple.com > > Subject: Re: origin: lower left vs lower right > > > > > > On Feb 3, 2011, at 8:51 PM, Uli Kusterer wrote: > > > > > On 03.02.2011, at 04:19, Todd Heberlein wrote: > > >> During the recent text orientation/position thread a couple of things > > >> caught my attention: (1) the text system seemed designed to have a > > >> flipped view (origin in the upper left), and (2) the iOS version of an > > >> NSView, the UIView, also has an origin in the upper left. > > >> > > >> If starting some new graphical code for Cocoa (which I may want to port > > >> parts of to iOS), is it advisable to use a flipped coordinate system > > >> (origin in upper left)? In other words, is "upper left" the origin of > > >> the future? > > > > > > It's not a matter of "the future" it is a matter of purpose. Mathematics > > > has traditionally had the origin in the lower left, so if you're working > > > with equations from textbooks, it is more convenient to leave the > > > coordinate system unflipped. > > > > > > However, historically human writing and the Mac user interface have had a > > > top-left to lower-right direction, so if you are laying out lists, or > > > text, or other sequences for humans, it is generally more convenient (and > > > even efficient) to use a flipped coordinate system. Otherwise, if you for > > > example resize a window, you have to manually adjust any content that is > > > aligned with the upper left, because when resizing an unflipped > > > coordinate system, the upper left corner has "moved", even though on a > > > Mac the grow box is in the lower right. > > > > > Not all human writing has a historical root in top-left to lower-right > > direction! > > In fact one area that is still a weakness, particularly for eBooks, is the > > lack of vertical top-right to lower-left text views in AppKit and UIKit. > > Literary texts are still written in this form in Japanese and Chinese. > > These writing systems are also not based on the same typographical concepts > > as western writing systems... they're based on a consistent square for each > > character. > > So in that regard, the coordinate system is also off. > > > > > > _______________________________________________ > > > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > > > Please do not post admin requests or moderator comments to the list. > > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > > > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/cocoa-dev/shashaness%40hotmail.com > > > > This email sent to shashan...@hotmail.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
