Re: [NTG-context] change width of a character with fonts.handlers.otf.addfeature

19 May 2017


      On 5/19/2017 9:34 AM, Ulrike Fischer wrote:
...
In extensions-001.tex
(http://minimals.metatex.org/current/context/test/doc/context/tests/mkiv/font...)
there is an example how to add or change the kern between two chars:
fonts.handlers.otf.addfeature {
        name = "ktest",
        type = "kern",
        data = {
            a = { b = -500 },
        }
    }
Can this be used to implement also a "Single adjustment positioning"
which would effectivly change the width of character?
(http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html#6....)
(I tried a few probable variants but got either errors or no effect
at all).
I'll add support for 'single' to user features:

\startluacode
     fonts.handlers.otf.addfeature {
         name = "stest",
         type = "single",
         data = {
             a = { -30, 0, -50, 0 },
         }
     }
\stopluacode

\definefontfeature[whatever][default][stest=yes]

\starttext

     \definedfont[Serif*whatever] \vl a\vl

\stoptext


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