Combining Graph Labeling and Compaction
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Combinations of graph drawing and map labeling problems yield challenging mathematical problems and have direct applications, e.g., in automation engineering.We call graph drawing problems in which subsets of vertices and edges need to be labeled graph labeling problems. Unlike in map labeling where the position of the objects is specified in the input, the coordinates of vertices and edges in a graph labeling problem instance have yet to be determined and thus create additional degrees of freedom. We concentrate on the Compaction and Labeling (COLA) Problem: Given an orthogonal representation—as produced by algorithms within the topology-shape-metrics paradigm—and some label information, the task is to generate a labeled orthogonal embedding with minimum total edge length. We characterize feasible solutions of the COLA problem extending an existing framework for solving pure compaction problems. Based on the graph-theoretical characterization, we present a branch-and-cut algorithm which computes optimally labeled orthogonal drawings for given instances of the COLA problem. First computational experiments on a benchmark set of practical instances show that our method is superior to the traditional approach of applying map labeling algorithms to graph drawings. To our knowledge, this is the first algorithm especially designed to solve graph labeling problems.
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- Combining Graph Labeling and Compaction
- Book Title
- Graph Drawing
- Book Subtitle
- 7th International Symposium, GD’99 Štiřín Castle, Czech Republic September 15–19, 1999 Proceedings
- pp 27-37
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- Online ISBN
- Series Title
- Lecture Notes in Computer Science
- Series Volume
- Series ISSN
- Springer Berlin Heidelberg
- Copyright Holder
- Springer-Verlag Berlin Heidelberg
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- Jan Kratochvíyl (4)
- Editor Affiliations
- 4. Faculty of Mathematics and Physics School of Computer Science, Department of Applied Mathematics, Charles University
- Author Affiliations
- 5. Max-Planck-Institut für Informatik Im Stadtwald, D-66123, Saarbrücken, Germany
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