[NTG-context] Re: MetaPost lines in tables?

[Henning Hraban Ramm <texml@fiee.net>]

Am 19.02.24 um 23:15 schrieb Wolfgang Schuster:
> Henning Hraban Ramm schrieb am 19.02.2024 um 22:39:
>> I guess I asked this a while ago, but I can’t find an answer:
>> Is it possible to replace the lines of a TABLE with my own MetaPost 
>> graphics?
>>
>> ATM I’m trying to place my MP lines behind a frame-less TABLE; it will 
>> probably work, but it’s a crutch…
> 
> The example below draws a custom border for the whole cell but you're 
> free to draw only certain sides (leftboundary etc. helps) but don't 
> forget to set the boundary box for the graphic (OverlayBox is the size 
> of the cell).
> 
> %%%% begin example
> \startuseMPgraphic{dottedborder}
>    draw OverlayBox withpen pencircle scaled 2 dashed withdots withcolor 
> "red";
> \stopuseMPgraphic
> 
> \defineoverlay[dottedborder][\useMPgraphic{dottedborder}]
> 
> \starttext
> 
> \bTABLE[frame=off,background=dottedborder]

Thank you!

Since I needed only horizontal lines, I forced the height with an 
“invisible“ line:

\startuseMPgraphic{dottedborder}
    draw (0,0)--(0,OverlayHeight) withpen pencircle scaled 0.001 
withcolor white;
    draw (0,0)--(OverlayWidth,0) withpen pencircle scaled 2 dashed 
withdots withcolor "red";
\stopuseMPgraphic

… but it would be visible on a colored background. I’m sure you can show 
me a better way…

My real life example (p.2 in https://yemaya.fiee.net/s/DEEHs5m49yftiqW) 
involves sketchy lines, and there it’s a bit annoying that the row is 
not its own frame that could get a continuous background… Well, it’s 
good enough, I’ll settle for it.

Hraban
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