tolist.tex

\documentclass{standalone}
\usepackage{tikz,rxmarbles}
\usetikzlibrary[arrows,shapes,positioning,matrix]

\begin{document}
\begin{tikzpicture}

\matrix[row sep=0.5cm]
{
  \draw [time] (0,0) -- (7,0);
  \node[marble,circle,red] (0x0) at (0.5,0) {};
  \node[marble,circle,yellow] (1x0) at (1.75,0) {};
  \node[marble,circle,green] (2x0) at (3.5,0) {};
  \node[complete] (6x0) at (4,0) {};
  \\
  
  \node[box,minimum width=7cm] (op) {ToList};
  \\
  
  \draw [time] (0,0) -- (7,0);
  \node[buffer] (0x2) at (4,0) {
    \tikz[baseline=-1mm] \node[marble,circle,red] {}; ,
    \tikz[baseline=-1mm] \node[marble,circle,yellow] (x) {}; ,
    \tikz[baseline=-1mm] \node[marble,circle,green] (x) {};
  };
  \node[complete] (1x2) at (5.5,0) {};
  \\
};

\draw [fdash] (0x0) -- (0x0|-op.north);
\draw [fdash] (1x0) -- (1x0|-op.north);
\draw [fdash] (2x0) -- (2x0|-op.north);
\draw [fdash] (6x0) -- (6x0|-op.north);

\draw [rdash] (0x2) -- (0x2|-op.south);

\end{tikzpicture}
\end{document}