On Layered Fan-Planar Graph Drawings

02/22/2020

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by   Therese Biedl, et al.

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In this paper, we study fan-planar drawings that use h layers and are proper, i.e., edges connect adjacent layers. We show that if the embedding of the graph is fixed, then testing the existence of such drawings is fixed-parameter tractable in h, via a reduction to a similar result for planar graphs by Dujmović et al. If the embedding is not fixed, then we give partial results for h=2: It was already known how to test existence of fan-planar proper 2-layer drawings for 2-connected graphs, and we show here how to test this for trees. Along the way, we exhibit other interesting results for graphs with a fan-planar proper h-layer drawings; in particular we bound their pathwidth and show that they have a bar-1-visibility representation.