[cl-typesetting-devel] Decorations and change bars

[Marc Battyani]

"Klaus Weidner" <kw at w-m-p.com> wrote:

> On Wed, Apr 21, 2004 at 03:50:57PM -0500, Klaus Weidner wrote:
> > Hmmm, one approach would be to support a function-valued style
parameter,
> > which is called when the character is stroked and can add whatever
> > decoration it wants, based on the box geometry. Ideally this would be
> > stackable, so that for example colored backgrounds don't get turned off
> > when an underline is added in a subsidiary span.
>
> Done, see attached patch. It adds pre-decoration and post-decoration
> styles, which can be keywords (not used at this time) or functions that
> are called before or after drawing characters.
>
> One thing that kept me busy debugging for some time was the effect that
> whenever a style property is NIL, any value assigned to it will be
> permanent since the NIL will not be restored. I've added a comment about
> that in specials.lisp.
>
> A small change to top-level.lisp was needed to support a :finalize-fn
> argument for a function that is called on each complete page.
> Implementing change bars was almost trivial after that, including
> left/right margin alteration for even/odd pages. And that's something
> that apparently isn't even possible in LaTeX...

Yeah I like that! (Stuff not possible with LaTeX)

> With these two changes, I got the fancy change markings I wanted :-) See
> attached PDF and tt-render.lisp. The latter is just a demo and too messy
> for inclusion, I'll try to find the time to clean it up when I'm less
> tired. This is addictive.

Great!

I know it's messy but I feel it's better to publish it anyway so that others
can try and test it. So for now I left all the new code in a
kw-extensions.lisp file but I will dispatch it to better locations later. I
will also change the test example to show the new possibilities. (and move
your tests functions to there)

I've merged all this in the repository and the tarball.

Marc