Special issue on Selected papers from the Twenty-seventh International Symposium on Graph Drawing and Network Visualization, GD 2019
Bundled Crossings Revisited
Steven Chaplick, Thomas C. van Dijk, Myroslav Kryven, Ji-won Park, Alexander Ravsky, and Alexander Wolff
Vol. 24, no. 4, pp. 621-655, 2020. Regular paper.
Abstract An effective way to reduce clutter in a graph drawing that has (many) crossings is to group edges that travel in parallel into bundles. Each edge can participate in many such bundles. Any crossing in this bundled graph occurs between two bundles, i.e., as a bundled crossing. We consider the problem of bundled crossing minimization: A graph is given and the goal is to find a bundled drawing with at most $k$ bundled crossings. We show that the problem is NP-hard when we require a simple drawing. Our main result is an FPT algorithm (in $k$) for simple circular layouts where vertices must be placed on a circle and edges must be drawn inside the circle. These results make use of the connection between bundled crossings and graph genus. We also consider bundling crossings in a given drawing, in particular for storyline visualizations.
Submitted: November 2019.
Reviewed: January 2020.
Revised: April 2020.
Accepted: June 2020.
Final: June 2020.
Published: December 2020.
Communicated by Daniel Archambault and Csaba D. Tóth
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