On 10/14/2023 7:55 PM, Pablo Rodriguez wrote:
On 10/14/23 14:19, Hans Hagen via ntg-context wrote:
On 10/12/2023 3:14 PM, Pablo Rodriguez wrote:
I see that the directive for link borders only allows one color for
links per document.

Many thanks for your reply, Hans.

I apologize for my poor explanation of the issue.

Wanting to give a minimal sample, I didn’t add my full interaction setup:


I wanted to be able to setup the interactive link color only, not to add
any color to the link text. This would be similar to the following object:

     /Type /Annot
     /A 3 0 R
     /Border 1 0 R
     /C [ 0 .6 0 ]
     /F 4
     /Subtype /Link
     /Rect [ 11.148045 64.22294 29.080798 78.65044 ]

The "references.border" directive sets all /C keys in /Link objects to
one single color in the same document.

indeed, because these objects get creates when apage is shipped out and we don't let additional color (or style for tham matter) information travel with the link info

I may edit a single file by hand (such as in the attachment), but I
won’t be able to do that in a larger PDF source.
Drawing something in the document (avoiding the interactive link border)
is not the solution here.

you mentioned that you use it for checking so then rendered different whatever styling is reasonable; once you render a final version the single color will do

Would it be possible that \setupinteraction could have a bordercolor
key, such as the color one?

All is possible but not all should be done, especially not features that
mostly serve a few viewers (like acrobat) and don't really relate to

Interaction is key in cases such as the one described, because this kind
of interaction avoids two things (or a twofold situation):

* Link borders won’t be printed in paper and they’ll be displayed on screen.

* This kind of interactivity avoids having to provide recipients with
two versions of pretty much the same document (screen and print version).

it's one of the nice things about tex that one can easily generate two versions; for screen i'd even make a landscape instead of portrait version and maybe for phones yet another

Having to deal with more than one version of almost any documents tends
to cause confussion to most people and it eventually leads to errors.

Sorry, but I have to keep resulting PDF documents as simple as possible.
For their recipients, but this also helps me.

but one color will do then in the final document ... multiple for different links / targets is also confusing

Of course, one clear objection to my approach is that PDFium (the PDF
viewer in Chrome/Edge) doesn’t display annotation borders.


There are a handful of PDF features that PDFium doesn’t support
(attachments and electronic signatures, to name other two).

indeed ... and after decades of pdf that tells a story ... maybe no one using or programming open source viewers care much about it and when different viewers also behave different we end up with endless adaptation and patching which is no fun either

In that case, many people understand that PDF (the format itself) is
“PDF according to Google” (or “PDF according to Microsoft”, since PDF is
opened with Edge by default since Win7).

hard to say what is default ... esp when bugs become/became features ...

I experience this at work every single day and I’m tired to tell people
“please, use Acrobat to display PDF documents and make it your default
PDF viewer” (otherwise, it is impossible to know whether a PDF document
is electronically signed or not [among other features]).

i admit that i never nbother about signed documents; the last time i got some link to an adobe server telling me that i had to sign something i just removed the mail (who knows what they do with your data)

Your workaround works best when you have only one medium to handle the
document (only displayed on screen). Since it also avoids annotations,
it will work with all (or almost all) PDF viewers. Even if a document
doesn’t need to be printed now, it doesn’t mean it won’t be needed to
print it in the future (so this might give issues in the long run).

yes but you wanted it for checking, so then a 'temporary' rendering as mentioned can work ok; it can even be more visible if you use think borders

On the general issue here [PDF features only implemented by Acrobat and
few viewers], it is a fact Acrobat is only one PDF viewer. But it can be
considered the «de facto» standard implementation of the format.

with the user interface becoming more horrible every i try to avoid the reader (sumatra works just fine)

(viewers in broswers or mail agents can also be weird: currently my thunderbird shows white text on black pages, if at all)

I know Acrobat contains errors (deviations from the specification), but
this is not very relevant now (since not even Adobe claims that Acrobat
implementation of the PDF spec is fully conformant with the it).

i suppose that the feautures added for some specific customer (or application) are not really concidered part of the standard; as with any standard: only the things everyone understands and can test are real; basically pdf is an application format that happened to be widely used and therefore survived

For example, MuPDF, SumatraPDF and Chrome/Edge don’t care about
/EmbeddedFiles or annotation borders.

probably because embedding was kind of fuzzy (described) from the start with evolving implementations and wrt borders: they just look ugly in documents so i tend to ignore these (plenty of other stuff to read)

MuPDF may access to the embedded file only to save its contents from
/FileAttachment. Again, it has to be saved first, to be opened and
displayed then. No matter whether the file is actually a PDF document.

that actually might be more reliable (also memory wise unless one caches on disk) than making the viewer more complex by adding all king of options

SumatraPDF follows the same path, but it doesn’t seem to enable saving
attachments in its latest stable release.

hm, i admit that i didn't even knew it supports it; for me support of layers and basic javascript is a threshold for considereing a viewer more mature

I know there is no way to have it all. But at least in the case of
attachments, I think it is clear that (what to some viewers seeems to
be) new functionality has to be implemented.

As for the users, sorry to disagree with you, Hans, we need a decent
viewer (and I’m not an Acrobat user at home). I mean, a viewer that
implements the required features (by the document creator or their

as said: there has been plenty of time to add trivial things like showing borders to viewers but it's not considered essential; personally i never assume such application specific features to be long term stable and therefore avoid them

That being said, if different annotation border colors (/C value in
/Annot) is not an option in ConTeXt, a single annotation border color
will be a “must have”.

but that works afaik (we probably can have different border colors per annotation type without much extra code / overhead (if i ever need it in a project that pays the bills i might consider some plugin)

That said, we can add some styling. First of all, you can use a bit of

Many thanks for your help again.

I’m afraid for the reasons explained above, this cannot be my way.

which already might help you. To make it easier I'll add \namedgoto do
that one can say:
I'll also add \outline and \outlined
which of course you then will wikify ...

Of course, I’ll wikify this new feature in ConTeXt.

As it might help other users, I‘m happy to help.

I’ll have to wait until I test \namedgoto myself, because I don’t get
how \namedgoto may differ from \goto.

it obeys an interaction instance (so text color and such)

I attached an example but there is no upload (will happen when the build
is running again because I can't make osx bins here).

So all new releases will be held untill the build farm is running again,
won’t they?

indeed. which is no real problem because i rewrote some mechanisms to be a bit more lmtx-ish (internally):

- effects, like extend, squeeze, weight, slant and combinations including local control - italic correction (math already lost it, text is now somewhat cleaner) with neglectable overhead - even better (and closer rto normal) compact font mode (which was actually the reason for the other changes)

this means: sometimes smaller pdf files, slightly better backend performance because we default now to previously experimental code paths, sometimes less font loading, a bit faster startup time (in compact mode)

but as it needs testing i'd not upload it before a few power testers give the green light


Many thanks for your help again,

                                          Hans Hagen | PRAGMA ADE
              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
       tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl

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