Re: [Rubycocoa-talk] Alternative to NSGraphicsContext graphicsContextWithGraphicsPort:flipped:
Re: [Rubycocoa-talk] Alternative to NSGraphicsContext graphicsContextWithGraphicsPort:flipped:
- Subject: Re: [Rubycocoa-talk] Alternative to NSGraphicsContext graphicsContextWithGraphicsPort:flipped:
- From: Scott Thompson <email@hidden>
- Date: Wed, 01 Jul 2009 17:20:16 -0500
On Wednesday, July 01, 2009, at 02:51PM, "Duncan McGregor" <email@hidden> wrote:
>Hi
>
>I'm writing PDF's with RubyCocoa, and want to set the current graphics
>context to a PDF context from CGPDFContextCreateWithURL so that I can
>draw on it.
>
>Essentially my code says (sorry, ObjC folks, Ruby follows)
>
>@pdf_context = CGPDFContextCreateWithURL(pdf_url, CGRectMake(0, 0,
>100, 100), nil)
>.....
>NSGraphicsContext.saveGraphicsState
>nscontext =
>NSGraphicsContext
>.graphicsContextWithGraphicsPort_flipped(@pdf_context, true)
>NSGraphicsContext.setCurrentContext(nscontext)
>
>My problem is that graphicsContextWithGraphicsPort:flipped: crashes
>RubyCocoa. It's a known issue, and has been fixed, but not shipped in
>10.5.7
>
>Can anyone suggest any workarounds that could get the pdf_context
>current?
If I understand... you're going all the way to NSGraphicsContext just to flip the coordinate system? That's a long row to hoe :-).
Try something like (typed into mail)
CGContextTranslateCTM(pdf_context, 0, 100); # where 100 is the height of the context...
CGContextScaleCTM(pdf_context, 1.0, -1.0);
use that instead of trying to set the flipped bit.
Scott
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