Simple tikz block schemas

result.png

tikzschema.tex

%%
%% Author: Thomas Schouten
%% 05-03-2018
%%

% Preamble
\documentclass[11pt]{article}
\usepackage{tikz}

\usetikzlibrary{positioning, arrows.meta, shapes.geometric}


% Default arrow length: (length right, length up)
\newcommand{\standardlength}{1,0}

% Default arrowhead.
\newcommand{\standardarrow}{-{Latex[length=2mm,width=2mm]}}

% Document
\begin{document}

    \begin{figure}
        \centering
        \begin{tikzpicture}
            \node[left] (one) { One };
            \draw[\standardarrow] (one.east) -- ++(\standardlength)
            node[right] (two) { Twoooooooooooooo };
            \draw[\standardarrow] (two.east) -- ++(\standardlength)
            node[right] (three) { Three };
            \draw[\standardarrow] (three.east) -- ++(\standardlength)
            node[right] (four) { Four };
        \end{tikzpicture}
        \caption{ cap }
        \label{fig:one}
    \end{figure}

    \begin{figure}
        \centering
        \begin{tikzpicture}
            \node[left] (one) { One };
            \draw[\standardarrow] (one.east) -- ++(1.5,0)  node[above, pos=0.5] { asdf }
            node[right] (two) { Two };
            \draw[\standardarrow] (two.east) -- ++(\standardlength)
            node[right] (three) { Three };
            \draw[\standardarrow] (three.east) -- ++(\standardlength)
            node[right] (four) { Four };
        \end{tikzpicture}
        \caption{ cap }
        \label{fig:two}
    \end{figure}

    \begin{figure}
        \centering
        \begin{tikzpicture}
            \node (one) { UpOne };
            \node[below of=one] (two) { DownOne };
            \draw[\standardarrow] (two.east) -- ++(\standardlength)
            node[right] (three) { Twoooo };
            \draw[\standardarrow] (one) -- (three);
            \draw[\standardarrow] (three.east) -- ++(\standardlength)
            node[right] (four) { Threeeeeee };
            \draw[\standardarrow] (four.east) to [bend left=30] ++(\standardlength)
            node[right] (five) { Four };
        \end{tikzpicture}
        \caption{ More levels}
    \end{figure}

    \newcommand{\standardbend}{30}

    \begin{figure}
        \centering
        \begin{tikzpicture}[every node/.style={draw, circle}]
            \node (g) { G };
            \draw[\standardarrow] (g) to [bend left=\standardbend] ++(\standardlength)
            node[right] (m) { M };
            \draw[\standardarrow] (m) to [bend left=\standardbend] (g);
        \end{tikzpicture}
        \caption{ Circles }
    \end{figure}


\end{document}