Canonical Ordering for Triangulations on the Cylinder, with Applications to Periodic Straight-Line Drawings

Castelli Aleardi, Luca and Devillers, Olivier and Fusy, Éric (2013) Canonical Ordering for Triangulations on the Cylinder, with Applications to Periodic Straight-Line Drawings. In: 20th International Symposium, GD 2012, September 19-21, 2012 , pp. 376-387(Official URL: http://link.springer.com/chapter/10.1007/978-3-642...).

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Abstract

We extend the notion of canonical orderings to cylindric triangulations. This allows us to extend the incremental straight-line drawing algorithm of de Fraysseix, Pach and Pollack to this setting. Our algorithm yields in linear time a crossing-free straight-line drawing of a cylindric triangulation G with n vertices on a regular grid $ℤ/wℤ×[0..h]$, with $w ≤ 2n$ and $h ≤ n(2d + 1)$, where d is the (graph-) distance between the two boundaries. As a by-product, we can also obtain in linear time a crossing-free straight-line drawing of a toroidal triangulation with n vertices on a periodic regular grid$ ℤ/wℤ×ℤ/hℤ$, with $w ≤ 2n$ and $h ≤ 1 + n(2c + 1)$, where c is the length of a shortest non-contractible cycle. Since $c≤sqrt{2n}$, the grid area is $O(n^{5/2})$. Our algorithms apply to any triangulation (whether on the cylinder or on the torus) that have no loops nor multiple edges in the periodic representation.

Item Type:	Conference Paper
Additional Information:	10.1007/978-3-642-36763-2_34
Classifications:	G Algorithms and Complexity > G.280 Canonical Ordering P Styles > P.720 Straight-line
URI:	http://gdea.informatik.uni-koeln.de/id/eprint/1326

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