Using One-Dimensional Compaction for Smaller Graph Drawings

We review the technique of one-dimensional compaction and use it as part of two new methods tackling problems in the context of automatic diagram layout: First, a postprocessing of the layer-based layout algorithm, also known as Sugiyama layout, and second a placement algorithm for connected components with external extensions. We apply our methods to dataflow diagrams from practical applications and find that the first method significantly reduces the width of left-to-right drawn diagrams. The second method allows to properly arrange disconnected graphs that have hierarchycrossing edges. Keywords: one-dimensional compaction, diagram layout, layer-based layout, Sugiyama layout, disconnected graphs, dataflow diagrams

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