Interaction & Dynamic Queries 2

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Interaction &

Dynamic Queries 2

CS 7450 - Information Visualization February 6, 2003

John Stasko

Spring 2004 CS 7450 2

Dynamic Queries

• A more interactive query operation providing

− Intuitive feel for the data

− Immediate feedback

− Incremental, reversible operations

Review

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Spring 2004 CS 7450 3

DQ Sliders

• Potential disadvantages

− Operations are global in scope

− Controls must be fixed in advance

− Operations are conjunctive (each filter is and’ed together)

To see a disjunctive query, you must do each operation sequentially

Movable Filter - Magic Lens

• Allows interaction with more focused region of data

• More direct-manipulation-ish

• Interaction occurs “on top” of data

Fishkin & Stone CHI ‘95

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Spring 2004 CS 7450 5

Magic Lens

• Arbitrarily-shaped (usually rectangular) region with some operation that changes the user’s view of the data

− Movable

− Stackable

− Augmented by parameters that control the display

Spring 2004 CS 7450 6

In Action

Video

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Spring 2004 CS 7450 7

Magic Lens Example

http://www.parc.xerox.com/istl/projects/MagicLenses/

Stacking Filters

Op1 Op2

OR AND

Op1

Op1 Op2

Op2

Op1 OR Op2

Op2 AND Op1

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Spring 2004 CS 7450 9

Composition

• Manipulating stacks of lenses can be awkward

• Can make a compound lens by abstracting a stack of lenses into one new

composition lens

Spring 2004 CS 7450 10

Magnifying Lens

Median Home Price

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Spring 2004 CS 7450 11

Call-out Lens

Decatur Marietta Roswell Smyrna

Median Home Price

Applying Real Values

Decatur Marietta Roswell Smyrna

Median Home Price

160,000

Value of some variable of data can be mapped to 0.0->1.0 and shown visually

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Spring 2004 CS 7450 13

Other Applications

• What other kinds of things could you do?

Spring 2004 CS 7450 14

Other Applications

• Definition of word

• Details of graphical object

• Particular attributes of data points

• ...

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Spring 2004 CS 7450 15

DQ Via Magic Lens

• Advantages?

• Disadvantages?

Advantages

• Liveness

• Flexibility

• Ability to specify complex queries

• Don’t use as much real estate for controls

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Spring 2004 CS 7450 17

Disadvantages

• More complex than DQ sliders

− Not quite as easy to learn and use

• More difficult to implement

Spring 2004 CS 7450 18

HW3 Update

• Any problems, issues, questions?

• How to submit

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Spring 2004 CS 7450 19

Final Project

• Rough idea of topics

• Start forming your groups

• Topics due Feb. 19

Upcoming

• HW3 discussion & design problem

• Time Series Data

• Overview and detail

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Spring 2004 CS 7450 21

Sources Used

• Fishkin & Stone CHI ‘95 paper

• Xerox PARC Magic Lens website