Re: [beta] anch-pos.lua

[Philipp Gesang <gesang@stud.uni-heidelberg.de>]

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On 2012-02-16 10:17, Hans Hagen wrote:
> Hi,
> 
> I uploaded a beta. Apart from some fixes, the biggest change is in
> dealing with positional info and text backgrounds (first stage
> cleanup).  As I have no clue to what extend users mess around with
> background graphics themselves, it's hard to predict side effects,
> but the biggest impact is speed. The adventurous might want to try
> out

Hi Hans,

there seems to be a typo in anch-pos.lua, line 100:

·································································
-            local r = collected[region]
+            local r = collected[tag]
·································································

(“region” references a boolean.)

Here’s an example that triggers the bug and works after the
patch is applied. I have no idea as to why this exact series of
macros causes the issue. Please have a look at it anyways because
the text background looks weird even after.

·································································
\definetextbackground[tb]
\setuptyping[
  after={\stoptextbackground},
  before={\starttextbackground[tb]},
]

\starttext

foo
\starttyping
bar
\stoptyping
baz

\starttabulate[|r|l|]
  \NC  foo \NC bar \AR
\stoptabulate%

\stoptext
·································································

Regards
Philipp




> 
> \setuptextbackground
>   [mp=mpos:par:region,
>    method=mpos:par:region]
> 
> or with some more visual tracing
> 
> \setuptextbackground
>   [mp=mpos:par:region:kind,
>    method=mpos:par:region]
> 
> A simple test with some 200 backgrounds brings down runtime with one
> second on my machine (not the fastest anyway).
> 
> Apart from a performance gain, backgrounds are now also supported in
> regular multicolumns as well as in some specific mechanisms like
> tabulate and xtables. In xtables one needs to set region=yes in
> order to get the desired results. Actually, the region key is a new
> one in framed so anything that can be framed can also have fancy
> text  backgrounds.
> 
> Yet another improvement is that (although rather untested) you can
> do things like
> 
>     \starttextbackground[r] START
>     \dorecurse{10}{
>         \dorecurse{1}{\input ward }
>         \placefigure[right]{}{}
>         some text before BEGIN \dorecurse{2}{\input ward } END some after
>         \placefigure[left]{}{}
>         some text before BEGIN \dorecurse{2}{\input ward } END some after
>         \placefigure[right]{}{}
>         some text before BEGIN \dorecurse{2}{\input ward } END some after
>     }
>     STOP \stoptextbackground
>     \dorecurse{1}{\input ward }
> 
> and get more or less expected results. Keep in mind that it can
> never get perfect due to all kind of possible interference. Also,
> keep away from internals as they will quite certainly change.
> 
> Hans
> 
> 
> 
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
> -----------------------------------------------------------------
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

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