Browsing by Author "Jog, Ninog"
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Item Evaluating Spatial and Textual Style of Displays(1995) Shneiderman, Ben; Chimera, Richard; Jog, Ninog; Stimart, Ren; White, David; ISRThe next generation of Graphic User Interfaces (GUIs) will offer rapid access to perceptually-rich, information abundant, and cognitively consistent interfaces. These new GUIs will be subjected to usability tests and expert reviews, plus new analysis methods and novel metrics to help guide designers. We have developed and tested first generation concordance tools to help developers to review terminology, capitalization, and abbreviation. We have also developed a dialog box summary table to help developers spot patterns and identify possible inconsistencies in layout, color fonts, font size, font style, and ordering of widgets. In this study we also explored the use of metrics such as widget counts, balance, alignment, density, and aspect ratios to provide further clues about where redesigns might be appropriate. Preliminary experience with several commercial projects is encouraging.Item User Controlled Smooth Zooming for Information Visualization(1994) Jog, Ninog; Shneiderman, B.; ISRThis paper discusses the design and implementation of user controlled smooth zooming of a starfield display. A starfield display is a two dimensional graphical visualization of a multidimensional database where every item from the database is represented as a small colored rectangle whose position is determined by its ranking along ordinal attributes of the items laid out on the axes. One way of navigating this visual information is by using a zooming tool to incrementally zoom in on the items by varying the attribute range on either axis independently - such zooming causes the rectangles to move continuously and to grow or shrink. To get a feeling of flying through the data, users should be able to track the motion of each rectangle without getting distracted by flicker or large jumps - conditions that necessitate high display refresh rates and closely spaced rectangles on successive frames. Although the use of high-speed hardware can achieve the required visual effect for small databases, the twin software bottlenecks of rapidly accessing display items and constructing a new display image fundamentally retard the refresh rate. Our work explores several methods to overcome these bottlenecks, presents a taxonomy of various zooming methods and introduces a new widget, the zoom bar, that facilitates zooming.Item Using Interaction Object Graphs to Specify and Develop Graphical Widgets(1994) Carr, David A.; Jog, Ninog; Kumar, Harsha P.; Teittinen, Marko; Ahlberg, Christopher; ISRThis document describes five widgets that have been developed at the Human-Computer Interaction Laboratory of the University of Maryland. These widgets are: a range selection slider, a two- level alpha-slider, a secure switch, a tree viewer, and a treemap viewer. The last two use the same tree representation and can be used as alternate visualizations of the same hierarchy. In addition, a system for widget specification is introduced and each widget is specified using this system.