For people interested in this, a very interesting algorithm is the H-curve. It is described in this paper http://hint.fm/papers/158-wattenberg-final3.pdf http:/

For people interested in this, a very interesting algorithm is the H-curve. It is described in this paper http://hint.fm/papers/158-wattenberg-final3.pdf http://hint.fm/papers/158-wattenberg-final3.pdf It has the neat property that it ends where it starts if the grid has even width and height.