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2-D: Focus+Context

2-D: Focus+Context. cs5984: Information Visualization Chris North. Strategies. Detail only: detail without overview Zooming: detail becomes overview Transparency: detail on top of overview Overview+Detail: detail next to overview

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2-D: Focus+Context

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

  2. Strategies • Detail only: detail without overview • Zooming: detail becomes overview • Transparency: detail on top of overview • Overview+Detail: detail next to overview • Focus+Context: detail within overview • Focus+Context: • “Distortion-oriented display” • “Fisheye”

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

  4. Document Lens • Robertson, “Document Lens”, p 562 • priya, parool

  5. Bifocal Display • Leung, “Bifocal displays” • alex, qiang

  6. Distortion Functions • Mapping from info surface to display surface f Information surface Display surface

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

  8. Magnification Functions Bifocal 1st Derivative Magnification Magnification Information surface Information surface

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

  10. Perspective Wall / Document Lens Context gradually disappears Perspective

  11. 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

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

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

  14. Focus+Context • Bifocal • Perspective • Bubble • Wide-angle

  15. Quiz: TableLens • Bifocal!

  16. Fisheye Menus • combination of perspective

  17. Calendar • Leung

  18. Why not magnifying glass? • Hides local context

  19. F+C vs. O+D • - eye swapping • + higher zoom factor, higher scale • + really high scale with intermediates • + implementation (no math) • - distortion • + smooth transition • + more screen space efficient • +easier layout • - no flat overview, turn offf focus

  20. Next Week • Tues: Visual Overview Strategies • Stasko, “Information Mural” • ben, ahmed • Rayson, “Aggregate Towers” • anil, supriya • Thurs: Multiple View Strategies • Chi, “Visualization Spreadsheet” • mudita, abhi • North, “Snap-Together Visualization” • varun, kumar

  21. Assignment • Homework 2 due today

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