Hallelujah!!!

Thanks Stephen, that's the piece of the puzzle I was missing. I was assuming 
(or misinterpreting) that passing flipped:YES for the NSGraphicsContext 
ACTUALLY FLIPPED the context, not just informed it that the context had been 
flipped.

I found I had to set the CTM after the CGPDFContextBeginPage - looks like that 
might be resetting it, but basically, it works, I now get a right-way up PDF 
file.

Now I know my source data really is right-side up, I can figure out the second 
part which is making sure images that embody it DRAW right-side up.

thanks again, greatly relieved!

--Graham



On 28/05/2010, at 5:11 PM, Stephen J. Butler wrote:

> CGContextTranslateCTM( pdfContext, 0.0, size.height );
> // Now "flip" the y-axis so that it increases downwards
> CGContextScaleCTM( pdfContext, 1.0, -1.0 );

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