On Thu, Apr 29, 2010 at 11:46 PM, Ken Ferry <kenfe...@gmail.com> wrote:
> On Thu, Apr 29, 2010 at 10:28 PM, Graham Cox <graham....@bigpond.com>wrote: > >> >> On 30/04/2010, at 2:21 PM, danchik wrote: >> >> > mine did not, >> >> Did not what? >> >> >> > so I think I might have used context incorrectly: >> > >> > I had a different context to draw into so the code was : >> > >> > [NSGraphicsContext saveGraphicsState]; >> > [NSGraphicsContext setCurrentContext:MyActualContext]; >> > >> > // do the text draw/rotate >> > >> > [NSGraphicsContext restoreGraphicsState]; >> > >> > I was under impression that [... restoreGraphicsState] would restore >> the last context at the time it was [... saveGraphicsState]ed? >> > Or does each context have its own state stack? >> >> No. Each thread has its own state stack, so what you said is right - it >> will restore the graphics context that was current when +saveGraphicsState >> was invoked. >> > > Well, each thread has a stack of contexts, and each context has a stack of > states. +saveGraphicsState first does [currentGraphicsContext > saveGraphicsState] which pushes state, then pushes the context itself onto > the thread's stack of contexts. > …which may be what Graham said, or what you said, or both, or I don't know. Anyway. That. :-) -Ken Cocoa Frameworks > > >> >> >> > Would the proper way to draw to a different context be to save the >> current context first??? >> > >> >> >> Yes, which is what your code above will do. >> >> What it won't do is to 'undo' the transform of the second context. Rather >> than bother doing that, it might be easier just to reset it at the start, or >> use -set instead of -concat. If the second context has no other >> transformations needed on it, (as a view's context must do) then that should >> work. On the other hand, a view's context is always set up before -drawRect: >> is called so you usually don't have to worry about undoing additional >> transforms there either if nothing else draws following your rotated >> drawing. >> >> To reset the transform completely: >> >> [[NSAffineTransform transform] set]; >> >> --Graham >> >> >> _______________________________________________ >> >> 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/kenferry%40gmail.com >> >> This email sent to kenfe...@gmail.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
