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Informatik-Sonderkolloquium: "Drawing Planar Graphs with Constraints: Algorithmic and Empirical Aspects"
Jun. 20, 2018, 16:00
Informatik-Hauptbau (Geb. 50.34), HS -101 (UG), Am Fasanengarten 5, 76131 Karlsruhe

Drawing Planar Graphs with Constraints: Algorithmic and Empirical Aspects

Graph Drawing is a research area concerning automatic creation of pictorial representations of graphs. A node-link diagram is one of the most intuitive of these representations: the nodes are represented as 2 or 3-dimensional objects and edges as (poly-) lines or curves connecting the adjacent nodes. Node-link diagrams are used in a number of fields, including social science, bioinformatics, neuroscience, electronics, software engineering, business informatics and humanities.

The notions of readability, clarity, appropriateness (for an application) and aesthetic appeal of a node-link diagram are formalized using so-called drawing conventions, aesthetics functions and constraints that are fulfilled or optimized, by a graph drawing algorithm. Drawing conventions usually express requirements on the drawing from the perspective of an application: planarity, shape of the edges. Aesthetics functions are measures that assist how readable, clear and appealing a node-link diagram is, e.g., number of edge crossings, edge crossing angle, drawing resolution. Drawing constraints are local restrictions on a drawing provided by a user, e.g., set of nodes form a convex shape, important nodes lie on the top of the drawing or on pre-specified points.

I will start this talk with a short introduction into the field of Graph Drawing and a general description of research topics that I have studied. Afterwards, I will concentrate on the algorithms that produce node-link diagrams for planar graphs with constraints on the shape of the graphs’ faces. Finally, I will provide an overview of an empirical study suggesting that the shape of the outer face of a node-link diagram is an influential factor of it’s perceived aesthetics.

Dr. Tamara Mchedlidze
Institute of Theoretical Informatics, KIT
Kommunikation, Marketing und Events
Fakultät für Informatik
Karlsruher Institut für Technologie (KIT)
Am Fasanengarten 5
76131 Karlsruhe
Tel: 0721 / 608-48660
Fax: 0721 / 608-41777
Mail:prXil6∂informatik kit edu
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