4x4 KV Diagram LaTeX Macro

kvdiagram.tex

\usepackage{tikz}
\usepackage{calc}

%%% KV Table Macro
%%% USAGE:
%%% \kvtable{/*function name; e.g. f(x)*/}
%%%   {{ 0}{ 1}{ 5}{ 4}}
%%%   {{ 2}{ 3}{ 7}{ 6}}
%%%   {{10}{11}{15}{14}}
%%%   {{ 8}{ 9}{13}{12}}
%%%   {
%%%     /*Insert draw command for this scope*/
%%%   }
\def\kvtable#1#2#3#4#5#6{
  \begin{tikzpicture}
    \node at (1,3) {#1};
    \draw[|-|] (0.75,-2) -- (0.75,0) node[midway, left]{$x_{3}$};
    \draw[|-|] (1.5,-1) -- (1.5,1) node[midway, left]{$x_{1}$};
    \draw[|-|] (6,3.25) -- (4,3.25) node[midway, anchor=south]{$x_{2}$};
    \draw[|-|] (5,2.5) -- (3,2.5) node[midway, anchor=south]{$x_{0}$};

    \draw[step=1cm, gray, very thin] (2,-2) grid (6,2);
    
    \node[anchor=south west, scale=.5] at (2,1) {0};
    \node[anchor=south west, scale=.5] at (3,1) {1};
    \node[anchor=south west, scale=.5] at (2,0) {2};
    \node[anchor=south west, scale=.5] at (3,0) {3};
    
    \node[anchor=south west, scale=.5] at (5,1) {4};
    \node[anchor=south west, scale=.5] at (4,1) {5};
    \node[anchor=south west, scale=.5] at (5,0) {6};
    \node[anchor=south west, scale=.5] at (4,0) {7};
    
    \node[anchor=south west, scale=.5] at (2,-2) {8};
    \node[anchor=south west, scale=.5] at (3,-2) {9};
    \node[anchor=south west, scale=.5] at (2,-1) {10};
    \node[anchor=south west, scale=.5] at (3,-1) {11};

    \node[anchor=south west, scale=.5] at (5,-2) {12};
    \node[anchor=south west, scale=.5] at (4,-2) {13};
    \node[anchor=south west, scale=.5] at (5,-1) {14};
    \node[anchor=south west, scale=.5] at (4,-1) {15};

    \def\kvrow##1##2##3##4##5{
      \node[anchor=center, scale=1.25] at (2.5,##5) {##1};
      \node[anchor=center, scale=1.25] at (3.5,##5) {##2};
      \node[anchor=center, scale=1.25] at (4.5,##5) {##3};
      \node[anchor=center, scale=1.25] at (5.5,##5) {##4};
    }
   \kvrow#2{1.5}
   \kvrow#3{0.5}
   \kvrow#4{-0.5}
   \kvrow#5{-1.5}
   
   #6
 
   \end{tikzpicture}
}