An orthogonal drawing of a graph is a planar drawing where each edge is drawn as a sequence of horizontal and vertical line segments. Finding a bend-minimized orthogonal drawing of a planar graph of maximum degree 4 is NP-hard. The problem becomes tractable for planar graphs of maximum degree 3, and the fastest known algorithm takes O(n^5 log n) time. Whether a faster algorithm exists has been a long-standing open problem in graph drawing. In this paper we present an algorithm that takes only O~(n^{17/7}) time, which is a significant improvement over the previous state of the art.
@InProceedings{chang_et_al:LIPIcs.SoCG.2017.29, author = {Chang, Yi-Jun and Yen, Hsu-Chun}, title = {{On Bend-Minimized Orthogonal Drawings of Planar 3-Graphs}}, booktitle = {33rd International Symposium on Computational Geometry (SoCG 2017)}, pages = {29:1--29:15}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-038-5}, ISSN = {1868-8969}, year = {2017}, volume = {77}, editor = {Aronov, Boris and Katz, Matthew J.}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2017.29}, URN = {urn:nbn:de:0030-drops-72080}, doi = {10.4230/LIPIcs.SoCG.2017.29}, annote = {Keywords: Bend minimization, graph drawing, orthogonal drawing, planar graph} }
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