LaTeX

\documentclass[11pt]{article}
    \usepackage{fp}
    \usepackage{tikz}
    \usetikzlibrary{calc}

\begin{document}
    \newcommand\junctionNode[7]
    {
        % Modular core, works even if you don't enter anything. So changing the color/text/etc. is optional
        \ifstrequal {#1} {} {\def\varLoc{0,0}}      {\def\varLoc{#1}}
        \ifstrequal {#2} {} {\def\varIn{1}}         {\def\varIn{#2}}
        \ifstrequal {#3} {} {\def\varOut{1}}        {\def\varOut{#3}}
        \ifstrequal {#4} {} {\def\varName{Node}}    {\def\varName{#4}}
                                                     \def\varText{\textit{#5}}
                                                     \def\varLabel{#6}
        \ifstrequal {#7} {} {\def\varFill{blue!10}} {\def\varFill{#7}}
        % Getting the highest number of Inputs or Outputs
        \ifnumgreater {\varIn} {\varOut} {\def\varMinWidth{\varIn}} {\def\varMinWidth{\varOut}}
        % Creating the main/visible node
        \node
            [shape=rectangle,               draw=black,     fill=\varFill,
            label=above:\varLabel,          inner sep=0,    minimum height=1cm,
            minimum width=\varMinWidth cm]  at(\varLoc)     {\varText}
        ;
        % Subtracting 1 from the number of inputs and outputs because I need a zero based number in the loop
        \FPeval\varInputs {clip(\varIn-1)}
        \FPeval\varOutputs {clip(\varOut-1)}
        % Defining the current node width
        \newdimen\varAX
        \pgfextractx{\varAX}{\varName.west}
        \newdimen\varBX
        \pgfextractx{\varBX}{\varName.east}
    \FPeval\varASpacing {(\varBX - \varAX)/\varIn}
        % TO DO : Subtract the two X Coords to get node width, divide that by \varIn to get the node spacing <- VarASpacing.
        % The \pgfextract doesn't seem to work properly, replace that.
        % A 'For Loop' for the Inputs
        \foreach \varA in {0,...,\varInputs}
        {
            \node (\varName\varA) at (\varAX+\varASpacing/2+\varASpacing*\varA,0) {N1};
        }
        % A 'For Loop' for the Outputs
        \foreach \varB in {0,...,\varInputs}
        {
            \node (\varName\varB) at (\varAX+\varBSpacing/2+\varBSpacing*\varB,0) {N1};
        }
    }

    \begin{tikzpicture}
        \junctionNode{}{}{}{}{}{}{}
    %   \junctionNode{location}{n of in}{n of out}{name}{text}{label}{node fill}{input side}{output side}
    \end{tikzpicture}
\end{document}