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Bjorn Freeman-Benson

 

Publications by Bjorn Freeman-Benson (bibliography)

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1996
 
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Borning, Alan, Anderson, Richard and Freeman-Benson, Bjorn (1996): Indigo: A Local Propagation Algorithm for Inequality Constraints. In: Kurlander, David, Brown, Marc and Rao, Ramana (eds.) Proceedings of the 9th annual ACM symposium on User interface software and technology November 06 - 08, 1996, Seattle, Washington, United States. pp. 129-136. Available online

Inequality constraints are useful for specifying various aspects of user interfaces, such as constraints that one window is to the left of another, or that an object is contained within a rectangle. However, current local propagation constraint solvers can't handle inequality constraints. We present Indigo, an efficient local propagation algorithm for satisfying acyclic constraint hierarchies, including inequality constraints.

© All rights reserved Borning et al. and/or ACM Press

1993
 
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Freeman-Benson, Bjorn (1993): Converting an Existing User Interface to Use Constraints. 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. 207-215. Available online

Constraints have long been championed as a tool for user interface construction. However, while certain constraint systems have established a user community, constraint-based user interfaces have not yet been widely adopted. The premise of this paper is that a major stumbling block to their pervasive use has been the emphasis on designing new interface toolkits rather than augmenting existing ones. The thesis of the work described in this paper is that it is possible, and practical, to convert an existing user interface written in an imperative programming language into a similar user interface implemented with constraints. This thesis is proved by example: the conversion of HotDraw into CoolDraw.

© All rights reserved Freeman-Benson and/or ACM Press

1991
 
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Augeraud, Michel and Freeman-Benson, Bjorn (1991): Dynamic Objects. In: Jong, Peter de (ed.) Proceedings of the Conference on Organizational Computing Systems 1991 November 6-8, 1991, Atlanta, Georgia, USA. pp. 135-140. Available online

Object oriented representations are very convenient to describe real world. But real world is essentially dynamic. In object oriented languages the unique instantiation class condition is a limit of dynamicity expression. In this paper we give semantical and structural definition of objects with structure changes over time. So we allow the following properties: * the ability to refer to past and future states of the system (time viewing), * the ability to change the structure and behavior of an object or the entire system (evolution), * the ability to model semantic relations between objects, not only in the current time interval, but also between time intervals (i.e., the past and the future (inferences)).

© All rights reserved Augeraud and Freeman-Benson and/or ACM Press

 
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