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Typus
Verschleierung
Bearbeiter
Graf Isolan
Gesichtet
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Untersuchte Arbeit:
Seite: 189, Zeilen: 1-29
Quelle: Heer et al 2005
Seite(n): 5 (internet version), Zeilen: right column 3-30
[Available layouts include random, circular, gridbased, forcedirected, top-down (Reingold, E.M. and J.S. Tilford, 1981), radial (Yee, K.-P., D. Fisher, R. Dhamija, and M.A. Hearst; 2001),] indented outline, and tree map32 (Bruls, M., K. Huizing, and J.J. van Wijk, 2000) algorithms. These layouts are parameterized and reusable components. These facilitate the user to define their own new layouts by using existing modules. In addition, Prefuse supports space distortion of item location and size attributes, including graphical fisheye views (Sarkar, M. and M.H. Brown, 1992) and bifocal distortion (Leung, Y.K. and M.D. Apperley, 1992).

Force Simulation. Prefuse includes an extensible and configurable library for force-based physics simulations. This consists of a set of force functions, including n-body forces like gravity, spring forces, and drag forces. To support real-time interaction, n-body force calculations use the Barnes-Hut algorithm (Barnes, J. and P. Hut, 1986) to compute the otherwise quadratic calculation in log-linear time. The force simulation supports various numerical integration schemes. It is based on dynamic calculation of trade-offs in efficiency and accuracy, to update velocity and position values. These modules are based on numerical techniques like classic Runge-Kutta method. Again the design is flexible enough to accommodate the user defined extension to existing force based simulations.

Interactive Controls. Following the basic design of the Interactor paradigm (Myers, B.A., 1990), Prefuse includes parameterizable ControlListener instances for common interactions. It includes drag controls for repositioning ViualItems, focus controls for updating focus, navigation controls for panning and zooming, including both manual controls and speed-dependent automatic zooming (Igarashi, T. and K., 2000) and highlight settings in response to mouse actions and key press actions.

Available layouts include random, circular, gridbased, force-directed, top-down [EN 40], radial [EN 48], indented outline, and tree map [EN 10, EN 44] algorithms. These layouts are parameterized and reusable, hence one can write new layouts by composing existing modules. In addition, prefuse supports space distortion of item location and size attributes, including graphical fisheye views [EN 43] and bifocal distortion [EN 32].

Force Simulation. prefuse includes an extensible and configurable library for force-based physics simulations. This consists of a set of force functions, including n-body forces (e.g., gravity), spring forces, and drag forces. To support realtime interaction, n-body force calculations use the Barnes-Hut algorithm [EN 2] to compute the otherwise quadratic calculation in log-linear time. The force simulation supports various numerical integration schemes, with trade-offs in efficiency and accuracy, to update velocity and position values. The provided modules abstract the mathematical details of these techniques (e.g., 4th Order Runge-Kutta) from toolkit users. Users can also write custom force functions and add them to the simulator.

Interactive Controls. Inspired by the Interactor paradigm [EN 36], prefuse includes parameterizable ControlListener instances for common interactions. Provided controls include drag controls for repositioning items (or groups of items), focus controls for updating focus and highlight settings in response to mouse actions, and navigation controls for panning and zooming, including both manual controls and speeddependent automatic zooming [EN 25].


[EN 40] Reingold, E.M. and J.S. Tilford, Tidier Drawings of Trees. IEEE Transactions of Software Engineering, 1981. SE-7: p. 21-28.

[EN 48] Yee, K.-P., D. Fisher, R. Dhamija, and M.A. Hearst. Animated Exploration of Dynamic Graphs with Radial Layout. InfoVis'01. pp. 43-50 2001.

[EN 10] Bruls, M., K. Huizing, and J.J. van Wijk. Squarified TreeMaps. In Proceedings of Joint Eurographics and IEEE TCVG Symp. on Visualization (TCVG 2000): IEEE Press. pp. 33-42, 2000.

[EN 44] Treemaps for Space-Constrained Visualization of Hierarchies. 1998. http://www.cs.umd.edu/hcil/treemap-history/

[EN 43] Sarkar, M. and M.H. Brown. Graphical Fisheye Views of Graphs. CHI’92. pp. 83-91, May 1992.

[EN 32] Leung, Y.K. and M.D. Apperley, A Review and Taxonomy of Distortion-Oriented Presentation Techniques. ACM Transactions on Computer-Human Interaction, 1994. 1(2): p. 126-160.

[EN 2] Barnes, J. and P. Hut, A Hierarchical O(N Log N) Force Calculation Algorithm. Nature, 1986. 324(4).

[EN 36] Myers, B.A., A New Model for Handling Input. ACM Transactions on Information Systems, 1990. 8(3): p. 289-320.

[EN 25] Igarashi, T. and K. Hinckley. Speed-Dependent Automatic Zooming for Browsing Large Documents. UIST’00. pp. 139-148, 2000.

Anmerkungen

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Also see Nm/Fragment 183 25 where the source is mentioned.

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