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Balloon focus: a seamless multi-focus+context method for treemaps.

Ying Tu1, Han-Wei Shen

  • 1Computer Science and Engineering Department, Ohio State University, Ohio, USA. tu@cse.ohio-state.edu

IEEE Transactions on Visualization and Computer Graphics
|November 8, 2008
PubMed
Summary
This summary is machine-generated.

Balloon Focus is a novel technique for visualizing large hierarchical datasets. This method allows users to smoothly enlarge multiple selected items (foci) in a treemap while preserving the overall layout and context for better comparison.

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Area of Science:

  • Computer Science
  • Information Visualization

Background:

  • Treemaps are popular for visualizing hierarchical data.
  • Large treemaps present challenges for detailed inspection and comparison of specific items.

Purpose of the Study:

  • To introduce a novel multi-focus and context technique for treemap visualization.
  • To enable seamless enlargement of multiple selected items (foci) while maintaining context.

Main Methods:

  • Developed the Balloon Focus technique for treemap visualization.
  • Utilized a Directed Acyclic Graph (DAG) for positional constraints.
  • Employed an elastic model for item placement.
  • Integrated data query and manual focus selection into a visualization system.

Main Results:

  • Balloon Focus allows smooth enlargement of multiple foci.
  • The relative positions of all items are preserved during enlargement.
  • Remaining space is evenly distributed to non-focus items, maintaining a stable layout.
  • User studies indicate improved comparison of values and distributions for selected foci.

Conclusions:

  • Balloon Focus effectively addresses the challenge of detailed inspection in large treemaps.
  • The technique offers a stable and consistent visualization experience, avoiding abrupt layout changes.
  • Users can more effectively compare selected data points within a large hierarchical structure.