mailing-list for TeXmacs Users

[Martial Tarizzo <address@hidden>]

Following the idea of Nicola Mingotti, I wrote 4 macros, which work
reasonably well (to put the symbol at the end of the arrow, I use a
'move'... not so good. It is still the same problem : size of the box ?)

see attached files.

Martial


Le vendredi 20 mars 2015 à 12:26 +0000, Sam Liddicott a écrit :
> I attach my best attempt.
> 
> 
> The problem is as you indicate, Miguel, that box length units are not
> available, so in this case I have hard wired to 1ex, 1fn just to show.
> 
> 
> Perhaps we need a width & height function that text or part of the
> tree can be passed to?
> 
> 
> Or maybe the repeat function should also set the box units, so that we
> can have a gr-geometry tuple set to 1w 1h in a repeat box, guaranteed
> to repeat only once but fill the whole block?
> then we can have <repeat|x|<with|gr-frame|<tuple|scale|1gw|<tuple|0gw|
> 1gh>>|gr-geometry|<tuple|geometry|1w|1h|center>|<line|<point|
> 0|-1>|<point|1|0>>>>
> 
> 
> I prefer that option. On the other hand, that is how datoms ought to
> be working, why can't datoms provide those values?
> 
> 
> Sam
> 
> 
> 
> 
> 
> On Thu, Mar 19, 2015 at 11:17 PM, Miguel de Benito Delgado
> <address@hidden> wrote:
>         I've actually wanted this for some time and never found the
>         motivation to try it.
>         
>         On Wed, Mar 18, 2015 at 5:34 PM, Martial Tarizzo
>         <address@hidden> wrote:
>                 It would be great to compute these coordinates (i.e
>                 the position, width
>                 and height of the box), but I didn't find a way to get
>                 them .
>         
>         AFAIK box length units like "1l", "1w" are only available
>         within some specific macros like resize, move, etc. Search the
>         doc for more info.
>         
>         
>         I see three possible venues for implementing this:
>         
>         
>         1. Try something with virtual fonts. Some single characters
>         are indeed negated this way, but I wouldn't know how to extend
>         this to arbitrary content. Come to think of it, it doesn't
>         make much sense.
>         
>         
>         2. Try to coerce the box dimensions of the content to be
>         cancelled out of the macros I mentioned above, somehow storing
>         its value for later use. Out of the top of my head I don't see
>         how this would work, though.
>         
>         
>         3. Implement a new wide_box in C++ (see e.g. wide_bar_box,
>         wide_vect_box, etc.) I've attached a proof-of-concept patch
>         for those willing to hack around a bit. Apply it and then,
>         with some selection made in your document, run the scheme
>         command (make-wide "<cancelled>"), e.g. by clicking
>         Tools->Execute->Evaluate scheme expression
>         
>         
>         If someone finds the time to properly adjust the margins, and
>         this turns out to be the best solution we can think of
>         committing it. Of course, the other cancellations would be
>         cool as well, or maybe a more general mechanism which would
>         allow for easy user customization (different/multiple arrows,
>         etc.). Replacement of the super/lower indices would be nice
>         too...
>         
>         
>         But it's late...
>         
>         
>         Best,
>         --
>         Miguel de  Benito.
> 
>

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