[NTG-context] move glyph vertically

[Hans Hagen]

On 12/22/2022 12:54 PM, Pablo Rodriguez via ntg-context wrote:
> Dear list,
> 
> I have the following sample:
> 
>    \startluacode
>         fonts.handlers.otf.addfeature {
>             name = "gpos_test",
>             type = "single",
>             data = {
>                   [ '¿' ] = 1000,
>                   [ '¡' ] = 1000,
>             }
>         }
>    \stopluacode
>    \definefontfeature[ktest][gpost_tes=yes]
> 
>    \starttext
>    \startTEXpage[offset=1em]
>    \feature[+][gpos_test]
>    ¿? ¡!
>    \stopTEXpage
>    \stoptext
> 
> This tries to move vertically the opening question and exclamation
> marks, so they are at the same height that its closing counterparts.
> 
> I thought there may be a GPOS feature that could achieve this, but I
> must admit I have no idea about how to achive it.
> 
> In my document, this should only work with the slanted feature.
> 
> Could anyone tell me how could I move vertically single glyphs?
> 
> Many thanks for your help,
typos

   \definefontfeature[ktest][gpost_tes=yes]

and wrong feature name

   \feature[+][gpos_test]

so:

\startluacode
    fonts.handlers.otf.addfeature {
        name = "gpos_test",
        type = "single",
        data = {
              [ '¿' ] = { 0, 400 },
              [ '¡' ] = { 0, 400 },
        }
    }
\stopluacode

\definefontfeature[ktest][gpos_test=yes]

\starttext
   \startTEXpage[offset=1em]
       \ruledhbox{¿? xx ¡!}
       \addfeature{ktest}
       \ruledhbox{¿? xx ¡!}
   \stopTEXpage
\stoptext



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