Re: [Rubycocoa-talk] Alternative to NSGraphicsContext graphicsContextWithGraphicsPort:flipped:

[Duncan M. <du...@on...>]

On 2 Jul 2009, at 12:38, Scott Thompson wrote:

>
> On Jul 2, 2009, at 2:37 AM, Duncan McGregor wrote:
>
>> On Wed, Jul 1, 2009 at 11:20 PM, Scott Thompson<ea...@ma...> wrote:
>>
>>> If I understand... you're going all the way to NSGraphicsContext
>>> just to flip the coordinate system?  That's a long row to hoe :-).
>>
>> It would be, but I'm actually going to NSGraphicsContext so that I  
>> can
>> draw NSImages and NSStrings on the PDF without having to bang my head
>> against Quartz, especially in its font handling.
>
>
> :-) I know what you mean, Quartz 2D doesn't have any "font handling".
> I usually recommend a higher-level library like Cocoa for the text,
> but then I (personally) usually use the CG level calls instead of
> NSBezierPath, NSImage and friends.
>
> OK, the code I gave you should still work out OK with the exception of
> the images.  As I recall, NSImage is "smart" in that it respects the
> flipped bit of the context to do what it thinks is the Right Thing™
> (although all of NSImage's "smarts" tend to bite me in the behind
> often... I've heard it's much better under Snow Leopard).
>
> You might be able to set the flipped bit on the NSImages without
> running into a RubyCocoa crash.  Failing that, you can always, use
> some transform magic to flip the coordinate system the right way
> around right before you draw an image and then quickly put it back.

Thanks for the attempted help ;-) but the flipped isn't the issue. It  
just happens to be parameter to the call - in fact I already set a  
transform into the CGContext. My problem is that I have a CGContextRef  
and I need to create an NSGraphicsContext from it and set it current  
in order for the drawing code on NSString, NSImage etc to know where  
to draw.


Duncan