This is the `euclidean-lattice` package,
written by Jérôme Plût <jerome.plut@ssi.gouv.fr>.

This package provides a simple and efficient way
of drawing TikZ pictures of two-dimensional Euclidean lattices.

This material is distributed according to the LaTeX Project Public
License version 1.3c (https://www.latex-project.org/lppl.txt).