scan.tex

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

\begin{document}
\begin{tikzpicture}

\matrix[row sep=0.5cm]
{
  \draw [time] (0,0) -- (7,0);
  \node[marble,circle,red] (0x0) at (1,0) {};
  \node[marble,circle,green] (1x0) at (3,0) {};
  \node[marble,circle,blue] (2x0) at (5,0) {};
  \node[complete] (3x0) at (6.5,0) {};
  \\
  
  \node[box,minimum width=7cm] (op) {Scan\{
    (\tikz[baseline=-1mm] \node[marble,diamond] {};,\tikz[baseline=-1mm] \node[marble,white] (x) {};)
    \begin{tikzpicture}[baseline=-1mm]
      \node[marble,white,right=4.25mm of x,minimum size=6mm] (y) {};
      \node[marble,diamond,right=5mm of x] {};
      \draw [fdash] (x) -- (y);
    \end{tikzpicture}
  \}};
  \\
  
  \draw [time] (0,0) -- (7,0);
  \node[marble,circle,red] (0x2) at (1,0) {};
  \node[marble,circle,green,minimum size=6mm] (1x2) at (3,0) {};
  \node[marble,circle,red] at (3,0) {};
  \node[marble,circle,blue,minimum size=7.5mm] (2x2) at (5,0) {};
  \node[marble,circle,green,minimum size=6mm] at (5,0) {};
  \node[marble,circle,red] at (5,0) {};
  \node[complete] (3x2) at (6.5,0) {};
  \\
};

\draw [fdash] (0x0) -- (0x0|-op.north);
\draw [fdash] (1x0) -- (1x0|-op.north);
\draw [fdash] (2x0) -- (2x0|-op.north);
\draw [fdash] (3x0) -- (3x0|-op.north);

\begin{scope}[on background layer]
  \draw [fdash] (0x2|-op.south) -- ++(0,-0.25) -- ++(1,0) -- ++(0,1.5) -- ++(0.5,0) -- (1x0|-op.north);
  \draw [fdash] (1x2|-op.south) -- ++(0,-0.25) -- ++(1,0) -- ++(0,1.5) -- ++(0.5,0) -- (2x0|-op.north);
\end{scope}

\draw [rdash] (0x2) -- (0x2|-op.south);
\draw [rdash] (1x2) -- (1x2|-op.south);
\draw [rdash] (2x2) -- (2x2|-op.south);
\draw [rdash] (3x2) -- (3x2|-op.south);

\end{tikzpicture}
\end{document}