On 11/17/2014 11:51 AM, Christoph Reller wrote:
On Sun, 16 Nov 2014 15:29:20 Hans Hagen wrote:
> On 11/16/2014 9:52 PM, Wolfgang Schuster wrote:
> > Am 16.11.2014 um 20:47 schrieb Christoph Reller
> > >
> > > Hi,
> > >
> > > Has ConTeXt any support for producing a PDF with "optional content
> > > groups" (OCGs)?
> > >
> > > In Adobe's jargon OCGs are also known as "layers" (not to confuse
with
> > > layers in ConTeXt). See Section "4.10.2 Making Graphical Content
> > > Optional" in the PDF Reference 1.7 available at
> > >
http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/pdf_reference_1-7.pdf
> > >
> > > I cannot find anything on the Wiki nor in the ntg-context emails and
> > > grepping through the source code for "ocg" does not give reasonable
> > > results.
> >
> > You have to look for \defineviewerlayer and \startviewerlayer.
>
> A quick test if your pdf viewer supports is is:
>
> \showlayoutcomponents
>
> \starttext
> \input tufte
> \stoptext
Many thanks to all of you Hans, Wolfgang, and Pablo!
\definelayer and \startviewerlayer is a nice interface to basic OCGs
construction.
Is there any way to construct "Set-OCG-State Actions" with ConTeXt? (See
Section 8.5 Actions in the PDF Reference.) I admit that this is an
advanced feature of PDF and that most viewers apart from the Adobe
Reader are not capable of handling OCGs correctly.
I'm not sure what you mean but with the \goto command you can do a lot,
including sequences of actions that enable/disable layers and so (often
these things are done via javascript actions).
Hans
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