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Current orthogonal graph drawing algorithms produce drawings which are generally good. However, many times the quality of orthogonal drawings can be signicantly improved with a postprocessing technique, called renement, which improves aesthetic qualities of a drawing such as area, bends, crossings, and total edge length. Renement is separate from layout and works by analyzing and then ne-tuning the existing drawing in an ecient manner. In this paper we dene the problem and goals of orthogonal drawing renement, review measures of a graph drawing’s quality, and introduce a methodology which eciently renes any orthogonal graph drawing. We have implemented our techniques in C++ and conducted experiments over a set of drawings from ve well known orthogonal drawing systems. Experimental analysis shows our techniques to produce an average 37% improvement in area, 23% in bends, 25% in crossings, and 37% in total edge length.

Techniques for the Refinement of Orthogonal Graph Drawings