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Open AccessArticle

Modifying Orthogonal Drawings for Label Placement

Department of Mechanical and Industrial Design Engineering, T.E.I. of West Macedonia, Kozani 50100, Greece
Department of Computer Science, University of Crete, Heraklion 70013, Greece
Author to whom correspondence should be addressed.
Academic Editor: Maurizio Patrignani
Algorithms 2016, 9(2), 22;
Received: 20 December 2015 / Revised: 10 March 2016 / Accepted: 16 March 2016 / Published: 28 March 2016
(This article belongs to the Special Issue Graph Drawing and Experimental Algorithms)
PDF [668 KB, uploaded 28 March 2016]


In this paper, we investigate how one can modify an orthogonal graph drawing to accommodate the placement of overlap-free labels with the minimum cost (i.e., minimum increase of the area and preservation of the quality of the drawing). We investigate computational complexity issues of variations of that problem, and we present polynomial time algorithms that find the minimum increase of space in one direction, needed to resolve overlaps, while preserving the orthogonal representation of the orthogonal drawing when objects have a predefined partial order. View Full-Text
Keywords: automated label placement; edge labeling; graph labeling; orthogonal drawings; graph drawing; NP-hard automated label placement; edge labeling; graph labeling; orthogonal drawings; graph drawing; NP-hard

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Kakoulis, K.G.; Tollis, I.G. Modifying Orthogonal Drawings for Label Placement. Algorithms 2016, 9, 22.

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