Split cell into five equally sized “sub-cells” with fixed width

Question

I am trying to color cells of a table with 3 rows of 2 cm width each using tabularx and cellcolor. I want to split an arbitrary number of cells of this table into "sub-cells" with different colors, but I can't get the spacing right even with one split-up cell:

\documentclass{article}

\usepackage{tabularx}
\usepackage{xcolor}
\usepackage{colortbl}

\begin{document}

\begin{tabularx}{6cm}{|X|>{\hsize=.2\hsize}X@{}>{\hsize=.2\hsize}X@{}>{\hsize=.2\hsize}X@{}>{\hsize=.2\hsize}X@{}>{\hsize=.2\hsize}X|X|}
  \cellcolor{gray} &
      \cellcolor{red} & \cellcolor{green} & \cellcolor{yellow} & \cellcolor{orange} & \cellcolor{blue} &
  \cellcolor{gray} \\
  1 & \multicolumn{5}{X|}{2} & 3\\
\end{tabularx}

\end{document}

As can be seen below, the blue "sub-cell" is far bigger than the red, green, yellow and orange ones, which are too small. In total, the width seems to be o.k., though.

I found some tikz-based solutions here, but they use overlays which I am trying to avoid because I will likely be using a large number of tables and "sub-cells" for illustrating a document that I am currently working on. Is there any way to split each cell into "sub-cells" of equal width?

Answer 1

For that kind of figure/table I would really consider Tikz:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
  \fill[gray](0,0) rectangle (15,1.5);
  \foreach \x/\col in {5/red,6/green,7/yellow,8/orange,9/blue}{
    \fill[\col] (\x,0) rectangle +(1,1.5);
  }
  \foreach \x/\label in {0/1,5/2,10/3,15/}{
    \draw[thin] (\x,-1.5) -- +(0,3) node[pos=0.5,anchor=north west]{\Huge\label};
  }
\end{tikzpicture}
\end{document}