File talk:SVP.svg
The code to generate this file is
\documentclass[10pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[thick]
\pgfmathsetlengthmacro{\unit}{1.2cm}
\pgfmathtruncatemacro{\xmax}{2}
\pgfmathtruncatemacro{\ymax}{1}
\node(e1) at (\unit,0.1*\unit){};
\node(e2) at (0.3*\unit,0.7*\unit){};
\foreach \x in {-1,...,\xmax}{
\foreach \y in {-1,...,\ymax}{
\node[fill, circle, minimum size=0.1*\unit] at ($\x*(e1) + \y*(e2)$){};
}
}
\draw [->, blue, very thick] (0,0) -- node[below right]{$b_1$} ($2*(e1)+(e2)$);
\draw [->, blue, very thick] (0,0) --node[near start,above
left]{$b_2$} ($(e1)+(e2)$);
\draw [->, red, very thick] (0,0) -- ($-1*(e2)$);
\end{tikzpicture}
\end{document}
