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How to draw a planarization. (English) Zbl 1419.05200
Summary: We study the problem of computing straight-line drawings of non-planar graphs with few crossings. We assume that a crossing-minimization algorithm is applied first, yielding a planarization, i.e., a planar graph with a dummy vertex for each crossing, that fixes the topology of the resulting drawing. We present and evaluate two different approaches for drawing a planarization in such a way that the edges of the input graph are as straight as possible. The first approach is based on the planarity-preserving force-directed algorithm ImPrEd [P. Simonetto et al., “ImPrEd: An improved force-directed algorithm that prevents nodes from crossing edges”, Comput. Graph. Forum 30, No. 3, 1071–1080 (2011; doi:10.1111/j.1467-8659.2011.01956.x)], the second approach, which we call geometric planarization drawing, iteratively moves vertices to their locally optimal positions in the given initial drawing. Our evaluation shows that both approaches significantly improve the initial drawing and that our geometric approach outperforms the force-directed approach. To the best of our knowledge, this is the first paper concerned with the generation of a straight-line drawing that respects an arbitrary planarization.
##### MSC:
 05C85 Graph algorithms (graph-theoretic aspects)
##### Keywords:
geometric planarization drawing; planarization
Moca; OGDF
Full Text:
##### References:
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