There are white lines that appear at x=3, x=6, and possibly other places, depending on the ideal. It is also not always showing the correct lattice points in the convex hull. I think these are both issues with a rounding error. The size of a unit square is determined by the size of the window and the max x and max y coordinates but the locations of the lattice points are not necessarily "unit" distances apart because of rounding.
There are white lines that appear at x=3, x=6, and possibly other places, depending on the ideal. It is also not always showing the correct lattice points in the convex hull. I think these are both issues with a rounding error. The size of a unit square is determined by the size of the window and the max x and max y coordinates but the locations of the lattice points are not necessarily "unit" distances apart because of rounding.