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Steven H. Tang

 

Publications by Steven H. Tang (bibliography)

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1994
 
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Tang, Steven H. and Linton, Mark A. (1994): Blending Structured Graphics and Layout. In: Szekely, Pedro (ed.) Proceedings of the 7th annual ACM symposium on User interface software and technology November 02 - 04, 1994, Marina del Rey, California, United States. pp. 167-174. Available online

Conventional windowing environments provide separate classes of objects for user interface components, or "widgets," and graphical objects. Widgets negotiate layout and can be resided as rectangles, while graphics may be shared, transformed, transparent, and overlaid. This presents a major obstacle to applications like user interface builders and compound document editors where the manipulated objects need to behave both like graphics and widgets. Fresco[1] blends graphics and widgets into a single class of objects. We have an implementation of Fresco and an editor called Fdraw that allows graphical objects to be composed like widgets, and widgets to be transformed and shared like graphics. Performance measurements of Fdraw show that sharing reduces memory usage without slowing down redisplay.

© All rights reserved Tang and Linton and/or ACM Press

1993
 
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Tang, Steven H. and Linton, Mark A. (1993): Pacers: Time-Elastic Objects. In: Hudson, Scott E., Pausch, Randy, Zanden, Brad Vander and Foley, James D. (eds.) Proceedings of the 6th annual ACM symposium on User interface software and technology 1993, Atlanta, Georgia, United States. pp. 35-43. Available online

Current time-based presentation systems are rigid in that they assume the running time of all components of a presentation is constant. Furthermore, most systems offer little or no support for dynamically adapting the presentation quality to the (lack of) available system resources. In this paper, we introduce an object called a Pacer that is "time-elastic" in that it can adjust the quality of its presentation according to the amount of time available. We have implemented a direct manipulation graphical interface using pacers that can automatically degrade presentation quality in a controlled fashion depending on the user's input rate and the speed of the rendering system.

© All rights reserved Tang and Linton and/or ACM Press

1991
 
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Vlissides, John and Tang, Steven H. (1991): A Unidraw-Based User Interface Builder. In: Rhyne, James R. (ed.) Proceedings of the 4th annual ACM symposium on User interface software and technology Hilton Head, South Carolina, United States, 1991, Hilton Head, South Carolina, United States. pp. 201-210. Available online

Ibuild is a user interface builder that lets a user manipulate simulations of toolkit objects rather than actual toolkit objects. Ibuild is built with Unidraw, a framework for building graphical editors that is part of the InterViews toolkit. Unidraw makes the simulation-based approach attractive. Simulating toolkit objects in Unidraw makes it easier to support editing facilities that are common in other kinds of graphical editors, and it keeps the builder insulated from a particular toolkit implementation. Ibuild supports direct manipulation analogs of InterViews' composition mechanisms, which simplify the specification of an interface's layout and resize semantics. Ibuild also leverages the C++ inheritance mechanism to decouple builder-generated code from the rest of the application. And while current user interface builders stop at the widget level, ibuild incorporates Unidraw abstractions to simplify the implementation of graphical editors.

© All rights reserved Vlissides and and/or ACM Press

 
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