LaTeX table non-split cell with diagonal split colour

Question

Kind of a weird circumstance, but I have a table cell where I need the text to be in the cell normally (non-split) and the cell colour to be split diagonally.

I know how to use slashbox to split the cell, but there doesn't seem to be any way to split the colour without also splitting the text. Basically, I need it to look like this:

Any suggestions would be greatly appreciated.

CarLaTeX · Accepted Answer

Since you didn't add an MWE, I can only suppose this is what you need:

documentclass{article}
usepackage{makecell}
usepackage{tikz}
usetikzlibrary{matrix}
% code (slightly modified) from https://tex.stackexchange.com/a/343392/101651
tikzset{
diagonal fill/.style 2 args={fill=#2, path picture={%
fill[#1] (path picture bounding box.south west) -|
                         (path picture bounding box.north east) -- cycle;}},
reversed diagonal fill/.style 2 args={fill=#2, path picture={
fill[#1] (path picture bounding box.north west) |- 
                         (path picture bounding box.south east) -- cycle;}}
}

begin{document}
begin{table}
centering
begin{tikzpicture}
matrix[matrix of nodes,
    row sep=-pgflinewidth,
    column sep=-pgflinewidth,
    column 2/.style={nodes={text width=4.5cm}},
    row 1/.style={nodes={minimum height=7ex}},
    align=center,
    text centered,
    nodes={text width=2cm,
        text height=1.5ex,
        text depth=.25ex,
        minimum height=4ex,
        }] (mymatr) {
|[reversed diagonal fill={green}{red}]|makecell{Let'srecap} & makecell{Van Duck's rules}
1& Read the manuals
2& Look at the log
3& Search on TeX.SE
4& |[diagonal fill={yellow}{orange}]|color{blue}bfseries Always add an MWE
};
draw[thick] (mymatr-1-1.north west) -- (mymatr-1-2.north east);
draw (mymatr-1-1.south west) -- (mymatr-1-2.south east);
draw[thick] (mymatr-5-1.south west) -- (mymatr-5-2.south east);
end{tikzpicture}
end{table}
end{document}

Credits to ferahfeza for the diagonal fill and reversed diagonal fill styles.

F. Pantigny · Answer

With {NiceTabular} of nicematrix. That environment is similar to {tabular} (of nicematrix) but creates PGF/Tikz nodes under the cells, rows and columns.
Thus, it's possible to use Tikz to draw whatever you want under the cells of the array.
 documentclass{article}
usepackage{nicematrix}
usepackage{tikz}

begin{document}

renewcommand{arraystretch}{1.4}
begin{NiceTabular}{ccc}
CodeBefore
  begin{tikzpicture}
  fill [red!15] (1-|1) -- (2-|1) -- (2-|2) -- cycle ;
  fill [blue!15] (1-|1) -- (1-|2) -- (2-|2) -- cycle ;
  end{tikzpicture}
Body
Some text & other text & another text 
Some text & other text & another text 
Some text & other text & another text 
end{NiceTabular}

bigskip
begin{NiceTabular}{ccc}[hvlines]
CodeBefore
  begin{tikzpicture}
  fill [red!15] (1-|1) -- (2-|1) -- (2-|2) -- cycle ;
  fill [blue!15] (1-|1) -- (1-|2) -- (2-|2) -- cycle ;
  end{tikzpicture}
Body
Some text & other text & another text 
Some text & other text & another text 
Some text & other text & another text 
end{NiceTabular}

end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes under the hood).

LaTeX table non-split cell with diagonal split colour

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