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Issue No. 05 - May (2012 vol. 18)
ISSN: 1077-2626
pp: 822-835
A. S. Spritzer , Univ. Fed. do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
Carla M. Dal Sasso Freitas , Inst. de Inf., Univ. Fed. do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
MagnetViz was designed for the interactive manipulation of force-directed graph layouts, allowing the user to obtain visualizations based on the graph topology and/or the attributes of its nodes and edges. The user can introduce virtual magnets anywhere in the graph and these can be set to attract nodes and edges that fulfill user-defined criteria. When a magnet is placed, the force-directed nature of the layout forces it to reorganize itself in order to reflect the changes in the balance of forces, consequently changing the visualization into one that is more semantically relevant to the user. This paper describes MagnetViz's concepts, illustrating them with examples and a case study based on a usage scenario. We also describe how the MagnetViz has evolved since its original version and present the evaluation of its latest version. This evaluation consists of two user studies aiming at assessing generated layout quality and how well the concepts can be apprehended and employed, and a task taxonomy assessment focusing on establishing which graph visualization tasks the technique is able to handle.
user interfaces, data visualisation, directed graphs, task taxonomy assessment, MagnetViz tool, graph visualization tool, force-directed graph layout, graph topology, graph node, graph edge, virtual magnet, user-defined criteria, layout force, force balance, usage scenario, user studies, generated layout quality, Layout, Visualization, Magnetic separation, Shape, Data visualization, Topology, Color, social networks visualization., Graph visualization, force-directed layout, evaluation

C. M. Dal Sasso Freitas and A. S. Spritzer, "Design and Evaluation of MagnetViz—A Graph Visualization Tool," in IEEE Transactions on Visualization & Computer Graphics, vol. 18, no. , pp. 822-835, 2012.
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