Thanks Kyle, that seems to look like a fruitful approach. I'm doing the
following, which appears to be enough, i.e. it works. But should I be doing
anything else?
NSSize size = [self bounds].size;
NSRect destRect = NSZeroRect;
destRect.size = size;
NSMutableData* pdfData = [NSMutableData data];
CGDataConsumerRef consumer =
CGDataConsumerCreateWithCFData((CFMutableDataRef) pdfData );
CGRect mediaBox = CGRectMake( 0, 0, size.width, size.height );
CGContextRef pdfContext = CGPDFContextCreate( consumer, &mediaBox, NULL
);
CGDataConsumerRelease( consumer );
NSGraphicsContext* newGC = [NSGraphicsContext
graphicsContextWithGraphicsPort:pdfContext flipped:YES];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:newGC];
CGPDFContextBeginPage( pdfContext, NULL );
[self drawContentInRect:destRect fromRect:NSZeroRect withStyle:nil];
CGPDFContextEndPage( pdfContext );
[NSGraphicsContext restoreGraphicsState];
CGPDFContextClose( pdfContext );
CGContextRelease( pdfContext );
return pdfData;
This leads me on to a further question about correctly handling flippedness,
which quite honestly has me really confused.
The objects I'm drawing generally assume a flipped context, i.e. my view is
flipped and so is my entire coordinate system all the way down. I have not run
into any problems with that anywhere, it all works fine. But when I come to
generate the PDF above, I do have some flipping confusion.
I flip the context to match the expectation of the object itself. Thus text
draws relatively the right way up and in the right place.
If I take that (flipped) PDF data, use it to create an NSPDFImageRep and add it
to an NSImage, should the image be flipped or not? (Bear in mind this needs to
work on 10.5, so the newer flipped stuff is unavailable to help sort this
confusion out).
If I take the resulting image and display it in a cell, what should the cell do
about flipping? For example, if I put the image into NSImageView, it works
correctly and displays right way up. If I write the image to disk it is
imported into Preview right way up. But I have a couple of custom cells that
draw images that show the image wrong way up. What are these cells doing wrong
that I'm not getting? Should they do anything - maybe just leaving flippedness
of the image alone rather than try an match it to the control's context
flippedness is right? I just don't know. I've tried all combos I can think of
and none of them quite nails it.
--Graham
On 28/05/2010, at 11:24 AM, Kyle Sluder wrote:
> On May 27, 2010, at 6:20 PM, Graham Cox <graham....@bigpond.com> wrote:
>
>> Can I not create a PDF context, associate that with a NSPDFImageRep instead?
>> It appears I'm forced to use NSPrintOperation to do this which is slightly
>> weird as this has nothing to do with printing, nor do I have a view readily
>> available to attach to the NSPrintOperation. Surely there's a more
>> straightforward way than going round the houses like this?
>
> I believe we create a PDF CGContext, wrap it in an NSGraphicsVontext, and use
> +setContext: to get our nice vectory goodness.
>
> But I'm going from memory here, and I didn't write that code.
>
> --Kyle Sluder
>>
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