Re: [NTG-context] optical centering...

16 Dec 2011

      Am 16.12.2011 um 17:53 schrieb Chris Lott:
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On Fri, Dec 16, 2011 at 12:00 AM, Hans Hagen  wrote:
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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”.
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* 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

Re: [NTG-context] optical centering...

Wolfgang Schuster