Upward Planarization Layout
Recently, we presented a new practical method for upward crossing minimization , which clearly outperformed existing approaches for drawing hierarchical graphs in that respect. The outcome of this method is an upward planar representation (UPR), a planarly embedded graph in which crossings are represented by dummy vertices. However, straight-forward approaches for drawing such UPRs lead to quite unsatisfactory results. In this paper, we present a new algorithm for drawing UPRs that greatly improves the layout quality, leading to good hierarchal drawings with few crossings. We analyze its performance on well-known benchmark graphs and compare it with alternative approaches.
- 2.Di Battista, G., Pietrosanti, E., Tamassia, R., Tollis, I.G.: Automatic layout of PERT diagrams with X-PERT. In: Proc. IEEE Workshop on Visual Languages, pp. 171–176 (1989)Google Scholar
- 11.Gansner, E., Koutsofios, E., North, S., Vo, K.-P.: A technique for drawing directed graphs. Software Pract. Exper. 19(3), 214–229 (1993)Google Scholar
- 12.Gutwenger, C., Mutzel, P.: An experimental study of crossing minimization heuristics. In: Liotta, G. (ed.) GD 2003. LNCS, vol. 2912, pp. 13–24. Springer, Heidelberg (2004)Google Scholar
- 16.OGDF – the Open Graph Drawing Framework. Technical University of Dortmund, Chair of Algorithm Engineering, http://www.ogdf.net