1. A Review and Taxonomy of Distortion-Oriented Presentation Techniques Y.K Leung and M.D. Apperley Presentation by Sean Lynch

2. Problem In most computer systems, small viewing space Problems: locating items interpreting items determining relationships between items Two techniques: distortion-oriented and non- distortion

3. Non-distortion Techniques Display portion of data Divide information space into portions Arrange in a way for presentation

4. Problems with non- distortion Inadequate context for navigating large-scale information Solution: distortion-oriented techniques

5. Distortion Techniques Allow user to examine local areas in greater detail Fast-growing field with numerous techniques Taxonomy and unified theory needed

6. Distortion(2) Essence: local detail and global context

7. Polyfocal Display

8. Bifocal Display

9. Fisheye View(Furnas) Main technique is thresholding

10. Fisheye View(Hollands et al.) Used to represent subway network to compare fisheye vs. scrolling Three tasks: route task, locate/route task, itinerary task Generally closer to Bifocal than Furnas

11. Fisheye View(Mitta) Presentation for aircraft maintenance data Certain components were suppressed to increase focus Information suppressing technique

12. Perspective Wall

13. Graphical Fisheye

14. Taxonomy Techniques can be broken into two categories: Piece-wise Continuous: Bifocal, Perspective Wall Continuous: Polyfocal, Fisheye Piece-wise can be further broken into constant or varying

15. Unified Theory Treat displayed information as if on rubber sheet Consider bifocal display: a, b, c marked on sheet Sheet is stretched and distorted

16. A Framework for unifying presentation space M.S.T. Carpendale and Catherine Montagnese

17. Elastic Presentation Framework Unified framework for distortion and non-distortion based presentation methods Method of relating distinct methods into a single interface

18. Basic Geometric Concepts

19. Multi-Scale Presentations Made possible by inclusion of drop-off functions Focal regions set to a particular degree of magnification

20. Folding Repositioning of foci in lens Shear viewer-aligned vectors

21. Distance Metrics On Lp metrics, can provide different drop off functions

22. United Framework Framework provides method of relating distinct methods Allows for more than one presentation in a single interface Lens library offers a range of distortion choices.

23. Gaussian Lens Bell-shape Advantage: gentle focal integration Characteristics: focal magnification, good visual integration

24. Lens Library From left to right: Gaussian, Cosine, Hemisphere, Linear, Inverse Cosine, Manhattan Top row is focus to distortion Bottom row is distortion to context

25. Insets and Offsets Inset is a selected sub-region that is magnified Achieved at cost of local-context Offset is a selected sub-region moved and magnified Occludes other regions

26. Detail-In-Context Presentations and Zooming Typical drop-off functions use both x and y for distance function Can use either only x or only y

27. EPF Library Representation and presentation kept distinct Lenses have precise magnification control and positioning All lenses can be folded

28. Conclusions! Presented a taxonomy and unified theory of distortion- oriented presentation techniques Presented a unified framework for presentation spaces, with many different distortion techniques included

29. ANY QUESTIONs?