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2-D: Focus+Context

2-D: Focus+Context. cs5984: Information Visualization Chris North. Wendy Schafer. Moosburg moosburg.cs.vt.edu. Today. Robertson, “Document Lens”, p 562 ashwini, aejaaz Spence, “Bifocal Lens”, p 331,333. Focus+Context. Details within overview “Distortion-oriented display”

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2-D: Focus+Context

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  1. 2-D: Focus+Context cs5984: Information Visualization Chris North

  2. Wendy Schafer • Moosburg moosburg.cs.vt.edu

  3. Today • Robertson, “Document Lens”, p 562 • ashwini, aejaaz • Spence, “Bifocal Lens”, p 331,333

  4. Focus+Context • Details within overview • “Distortion-oriented display” • “Fisheye” • Leung, Apperley, “Taxonomy of distortion-oriented presentations”, book pg 350

  5. Visual Transfer Functions Display surface Information surface Identity function = normal flat overview Bifocal

  6. Magnification Functions 1st Derivative

  7. Bifocal Display • Spence, Apperley

  8. Bifocal Display Disadvantage: 1 dimensional stretching on the 4 sides

  9. Perspective Wall / Document Lens

  10. NonLinear Magnification • http://www.cs.indiana.edu/hyplan/tkeahey/research/nlm/nlm.html • http://www.cs.indiana.edu/hyplan/tkeahey/research/papers/infovis.98.html

  11. “Bubble” Disadvantage: local context highly de-magnified

  12. “Fisheye”, “wide-angle lens” Disadvantage: no flat area

  13. Quiz: TableLens • Bifocal!

  14. Fisheye Menus • Non-linear: combination of Bubble + fisheye

  15. Why not magnifying glass? • Hides local context

  16. F+C vs. O+D • + Scales up to larger data (zoom factor and chaining) • + Multi foci easier • + multiple overviews possible • + Easy to implement, Less math! • Fast system performance • - >=2 places to look (cross-eyed!) • Tracking field-of-view box hard • Hand-eye coordination problem • - detail and overview disconnected • - Windows/space management • - replicates detail data in overview • + Space efficient • + Detail connected to context • Smooth transition • + matches human vision/processing? • + Neato! • - Distortion • - Longer learning time • - no flat overview - Need a way to turn off focus • - Content moves differently than mouse • - hard to tell zoom factor

  17. Assignment • Read for Thurs (Visual Overview Strategies) • Stasko, “Information Mural”, web • sanjini, luhui • Project! • Mid-project status report: Tues March 27

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