On Jun 20, 2008, at 12:53 PM, John Calhoun wrote:
On Jun 20, 2008, at 5:21 AM, Adam R. Maxwell wrote:
If you want to draw in memory, I think you have to drop down to
Quartz; using PDFKit would likely be easier, but it looks like you
can only specify a Quartz filter when saving to a file?.
I think there may be some confusion with regards to drawing....
Antonio is correct that PDFPage has a -[drawWithBox:] method that is
used not simply for displaying to screen but also for rendering into
a PDF context for saving to file as well. So, you can still use
PDFPage, override -[drawWithBox:] in an app that has no intention of
displaying the PDF to screen.
The saving method is in PDFDocument. When called it walks through
each PDFPage in the document and calls it to render into a PDF
context. (Printing within PDF Kit does something similar, BTW.)
Optionally too, you can pass a QuartzFilter to the save method in
PDFDocument and get, for example, grayscale output.
You can also do something similar in Quartz with CGPDFDocumentRefs
and CGPDFPageRefs. The QuartzFilter stuff should work for
CGContexts as well.
There is I think a perception that PDF Kit is only for displaying
PDF's and I like to try to dispell that when I can. :-)
I appreciated Antonio's (and your) reminder :). If I understand
correctly, the OP could create a PDF context with
kCGPDFXDestinationOutputProfile set to a grayscale profile, set it as
the current context with [NSGraphicsContext setCurrentContext:], then
draw each PDFPage into it. Would you still have to use
CGContextBeginPage/CGContextEndPage in that case, or is there an
easier way to draw all pages of a PDFDocument into a given context?
There's an obvious advantage in using PDFKit if you're saving to disk,
but I'm curious to know if there's a distinct advantage in using it to
draw to memory. Subclassing PDFPage apparently requires 10.5, also,
unless I'm missing something.
thanks,
adam
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