# Diagonal separator in table corner in ConTeXt

How can one create a diagonal separator in a table corner in ConTeXt (like the package slashbox for LaTeX)?

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Here is a solution based on natural tables:

\startuseMPgraphic{DiagonalRule}
draw (0,OverlayHeight) -- (OverlayWidth,0);
clip currentpicture to OverlayBox; % otherwise the rule overlaps the table frame
\stopuseMPgraphic

\defineoverlay
[DiagRule]
[\useMPgraphic{DiagonalRule}]

\setupTABLE [1] [1] [background=DiagRule]

\starttext
\bTABLE
\bTR \bTD   \eTD   \bTD col   \eTD \eTR
\bTR \bTD row \eTD \bTD value \eTD \eTR
\eTABLE
\stoptext


The nice thing about natural tables is that the background of a cell can be just about anything. In this case, I am using a simple metapost graphic that draws a diagonal line.

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There is an anonymous edit suggestion for this answer which states to add clip currentpicture to OverlayBox; just before \stopuseMPgraphic because "otherwise the rule overlaps the table frame". Instead if approving it I add it here as comment so you can decide it for yourself. –  Martin Scharrer Mar 2 '11 at 12:09
@martin: yes, that makes sense, will edit –  Taco Hoekwater Mar 2 '11 at 12:24
thanks, that's nice. Is it possible to add headings to be separated by the diagonal too? Like having row\col in in top left table corner only. –  urso Mar 3 '11 at 16:25