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Planar L-Drawings of Directed Graphs

, , , , , , , and . Proc. 25th Int. Symp. Graph Drawing & Network Vis. (GD'17), volume 10692 of LNCS, page 465--478. Cham, Springer International Publishing, (2017)
DOI: 978-3-319-73915-1_36

Abstract

We study planar drawings of directed graphs in the L-drawing standard. We provide necessary conditions for the existence of these drawings and show that testing for the existence of a planar L-drawing is an NP-complete problem. Motivated by this result, we focus on upward-planar L-drawings. We show that directed st-graphs admitting an upward- (resp. upward-rightward-) planar L-drawing are exactly those admitting a bitonic (resp. monotonically increasing) st-ordering. We give a linear-time algorithm that computes a bitonic (resp. monotonically increasing) st-ordering of a planar st-graph or reports that there exists none.

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Planar L-Drawings of Directed Graphs | SpringerLink

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