Re: negative kerning

[Andreas Harder <aharder@uni-koblenz.de>]

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Am 18.01.2010 um 18:40 schrieb Hans Hagen:

> On 18-1-2010 18:28, Horacio Suarez wrote:
>> 
>> hello all:
>> 
>> I need someting like a negative kerning to reduce some paragraphs length.
>> 
>> I was reading the mails but I didn´t find it or was too complex for me.
> 
> otherwise you need to locally mess around with tolerance and penalties or the width of a space

What is the best way to „mess around“? Is it preferable (if changing the text or layout is no option) to set a bigger inter-word space or a more tolerant expansion or both? 

The latter I tried to achieve, but with no luck (attachment).

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\setuplayout[width=middle,header=0pt,footer=0pt]

\startluacode 
  fonts.expansions.classes['big-expansion'] = {
    stretch = 4, shrink = 4, step = .5, vector = 'default', factor = 5
  }
\stopluacode

\definefontfeature
  [extraexpansion][default]
  [expansion=big-expansion] 

\usetypescript[pagella]
\setupbodyfont[pagella,13.4pt]

% \setupalign[hz,hanging,stretch]

\definetolerancemethod
  [horizontal] [extraspace]
  {\spaceskip.35em plus.25em minus.2em\relax}

\definetolerancemethod
  [horizontal] [extrastretch]
  {\emergencystretch=18pt}

\definestartstop
  [SloppyPar] 
  [before={\start
      \setuptolerance[horizontal,extrastretch,extraspace]
      \setfontfeature{extraexpansion}}, % changes nothing
   after=\stop]

\overfullrule=6pt


\starttext \showframe[text]

\startcolumns[balance=no]
\startSloppyPar
  {\bf sloppy:}\par
  \input tufte \par \it \input knuth
\stopSloppyPar
\column
{\bf normal:}\par
\input tufte \par \it \input knuth 
\stopcolumns

\stoptext

%%% Local Variables: 
%%% mode: context
%%% TeX-master: t
%%% End: 

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Perhaps someone has further/better suggestions …

Greetings
	Andreas

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