Re: optical centering...

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

Am 16.12.2011 um 17:53 schrieb Chris Lott:

> On Fri, Dec 16, 2011 at 12:00 AM, Hans Hagen <pragma@wxs.nl> wrote:
>>>>> I've seen some discussion about creating a verse environment in ConTeXt
>>>>> that handles the alignment of long (broken) lines of text. But I can't find
>>>>> anything about optical centering as can be done in LaTeX using the gmverse
>>>>> package: http://www.ctan.org/pkg/gmverse
>>>>> 
>>>>> Is there something like this available for ConTeXt?
>>>> 
>>>> 
>>>> Can you make a PDF where we can see what do you want?
>> 
>> 
>> That's just a bunch of macro code ... what Wolfgang meant was output that
>> you want to see. Writing from scratch fo rwhat you need is easier that
>> deciphering macro code.
> 
> My apologies, this is what I meant to link to, a TUGboat article which
> has both the formulae for calculating the center and visual
> illustrations of the resulting centering:
> www.tug.org/TUGboat/tb29-1/tb91murzynowski-text.pdf
> 
> The package provides three things, in descending order of importance for me:
> 
> * optical centering, which is a calculation of the center point for
> the alignment of the box of text that is based on based on an average
> of the line lengths of the work being set. gmverse provides four
> different possible centering methods based on different formulae (if
> it matters, method 3 and 2 are most useful.

Centered text based on the longest line is simple but when it’s
better to make this a feature of the lines environment.

\def\startverse
  {\begingroup
   \dostartbuffer[versecontent][startverse][stopverse]}

\def\stopverse
  {\setbox\scratchbox\hbox\bgroup\framed[width=fit,align=right]\bgroup
     \startlines
     \getbuffer[versecontent]
     \stoplines
   \egroup\egroup
   \leftskip\the\dimexpr(\textwidth-\wd\scratchbox)/2\relax
   \startlines
   \getbuffer[versecontent]
   \stoplines
   \endgroup}

\starttext \showframe
\startverse
ASM rządzi
dioda świeci miodowo
chrząszcz chrzęści w czcionkach.
\stopverse
\stoptext

> * Alignment of broken lines, right-aligned to the length of the line
> above the break

I guess Hans can do this when he provides a setting similar to “align=last”.

> * An environment that needs no use of \\ to break lines, but does so
> based on the length of the line and automatically wraps long lines (as
> defined by a dimension) and uses the alignment above.

This is more or less what the lines environment does.

\startlines
line 1
line 2
…
\stoplines

Wolfgang
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