Re: [Axiom-developer] hyperlinked algebra

[Ralf Hemmecke]

Page, Bill wrote:
> On Tuesday, December 13, 2005 12:27 PM Ralf Hemmecke wrote:
> > Bill Page wrote:
> > > > Doing the same thing with \n instead of \- would be a bit more 
> > > > complicated. But I think for LaTeX-speakers \- is more natural
> > > > anyway.
> > > Hmmm ... maybe '\n ' would be better - more compatible with
> > > the definition of the "dot" language?
> > Well, yes, this may be a good reason to look for something that
> > works with \n. But the problem is that \n would be expanded during
> > \write so \nGroup would count as one control sequence which is
> > usually not defined. I don't know how I can easily achieve a
> > similar trick as with \-.
>
> What I had in mind was writing it like this:
>
>   XxxYyy [label="Xxx\n Yyy"];
>
> i.e. with a space character after the \n. That would allow LaTeX
> to treat it as a two-character command, right? And the extra
> space would not greatly affect the way GraphViz handles multi-line
> labels outside of LaTeX.

If you can generate it that way then just replace in the definition I gave

  \expandafter\def\csname -\endcsname{\string\n}%

by

  \def\n{\string\n}%

The output will be exactly the same. The space gets eaten by TeX because 
it comes after a control sequence.

> But I like your solution below better.
>
> > > Why would you say '\-' is more natural in LaTeX?
> > TeX has automatic hyphenation, but sometimes one must help. 
> > That can be done via the \- control sequence. Then TeX considers
> > the place where \- is as an additional place to break lines.

Well, I even think we should have

  \expandafter\def\csname -\endcsname{-\string\n}%

so that there would be a hyphen at the end of the first word.

> I have solved the remaining problems with using hyperlinking
> with GraphViz in LaTeX so that now the links in the diagram
> link directly to the appropriate section of the target. For
> example:
>
> http://wiki.axiom-developer.org/book--main--1/Endpaper3

Wow, it is really that easy!!!

AbelianGroup [label="AbelianGroup"URL="catdef.spad.pdf#ABELGRP"];

I think you are a hero in figuring that out so quickly.

> To make this work, I had to upgrade to the most recent GraphViz
> version 2.7 and also modify the procedure to create pdf files
> to use 'dvips -z' and 'ps2pdf'. This is now implemented for the
> pamphlet page type on MathAction.

Is there any chance to get this translated to html? As I have read 
GraphViz can output SVG, but I have no idea how to use it.

Ralf