seams this code means to put a hidden text with same size behind metapost shape.
but it does not work properly for me (current version: 2024.04.01 08:59) and produce empty page but with searchable hidden text.
also when i edit the code and replace metapost part like this:

\startMPcode
     draw lmt_outline [
         kind = "outline",
         text = "\getbuffer[MyText]",
      ]
         withcolor red
      ;
\stopMPcode

it produces a selectable hidden text on top of body and red text that drawn by metapost below of that.

How can this problem be solved?

i attached the codes and pdf results.

On Mon, Apr 8, 2024 at 4:37 AM Hans Hagen <j.hagen@xs4all.nl> wrote:
On 4/8/2024 8:22 AM, seyal zavira wrote:
> thank you Harban and Keith McKay.
>
>     \startMPpage
>            picture tt ; tt := lmt_outline [
>                kind = "path",
>                text = "\definedfont[name:texgyrepagellabold*default]foo
>     f o o",
>            ] ;
>
>            fill
>               for i within tt : pathpart i && endfor cycle
>               withshademethod "linear"
>               withshadedirection down
>               withshadecolors (red, blue) ;
>     \stopMPpage
>
>     I'll add this:
>
>     \startMPpage
>           draw lmt_outline [
>               kind = "outline",
>               text = "\definedfont[name:texgyrepagellabold*default]foo f
>     o o",
>           ]
>               withshademethod "linear"
>               withshadedirection down
>               withshadecolors (red, blue)
>           ;
>     \stopMPpage
>
>     so a single path option (no picture)
>
>     Hans
>
>
> Thank you so much for the sample examples
> it would be great to also make text select able in output pdf
> the third example currently does not work. did you mean you will add
> this feature for next updates?
we're talking outlines so that is paths which implies no search but you
can do this (Keith and/or Hraban will explain and/or wikify it)

\starttext

\startbuffer[MyText]
     \definedfont[name:texgyrepagellabold*default]foo f o o%
\stopbuffer

\startbuffer[MyText]
     \framed[align=normal,frame=off]{\input{tufte}}%
\stopbuffer

\setbox\scratchbox\hbox\bgroup
     \startMPcode
          draw lmt_outline [
              kind = "outline",
              text = "\getbuffer[MyText]",
          ]
              withshademethod "linear"
              withshadedirection down
              withshadecolors (red, blue)
          ;
     \stopMPcode
\egroup

\startoverlay

{\scale[height=\htdp\scratchbox,width=\wd\scratchbox]{\effect[hidden]{\getbuffer[MyText]}}}
     {\box\scratchbox}
\stopoverlay

\stoptext




-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________