TikZ package
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PGF/Tikz is a (La)TeX macro package for generating graphics. It comes with a user-friedly syntax layer called TikZ.
Nodes and Paths
\begin{tikzpicture}[node distance=2cm]
\node (3) [draw,circle, fill=yellow] {};
\node (0) at (0.2,-2) [draw,circle,fill=blue]{};
\node (4) at (0,-1.8) [draw,circle,fill=red,semitransparent]{};
\node (2) [draw,circle,fill=magenta, right of=3]{};
\node (1) [draw,circle,fill=green, below of=2]{};
\path[->] (0) edge (1);
\path[->] (1) edge (2);
\path[->] (2) edge (3);
\path[->] (3) edge (4);
\node (flux) at (1,-1) [] {$\Phi$};
\end{tikzpicture}