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Date: Tue, 10 Dec 1996 03:25:57 GMTServer: NCSA/1.4.2Content-type: text/html<html><head><TITLE>Multi-way versus One-way Constraints in User Interfaces: Experience with the DeltaBlue Algorithm</title></head><body><H2>Multi-way versus One-way Constraints in User Interfaces: Experiencewith the DeltaBlue Algorithm</H2><p>Authors: Michael Sannella, John Maloney, Bjorn Freeman-Benson, and AlanBorning<p><em>Software--Practice and Experience</em>, Vol. 23 No. 5, (May 1993),pages 529-566. Preprint published as UW Tech Report 92-07-05.<P><hr><H3>Abstract</H3>The efficient satisfaction of constraints is essential to the performanceof constraint-based user interfaces. In the past, most constraint-baseduser interfaces have used one-way rather than multi-way constraintsbecause of a widespread belief that one-way constraints were moreefficient. In this paper we argue that many user interface constructionproblems are handled more naturally and elegantly by multi-way constraintsthan by one-way constraints. We present pseudocode for an incrementalmulti-way constraint satisfaction algorithm, DeltaBlue, and describeexperience in using the algorithm in two user interface toolkits. Finally,we provide performance figures demonstrating that multi-way constraintsolvers can be entirely competitive in performance with one-way constraintsolvers.<P><HR><P>Click <!WA0><a href= "ftp://cs.washington.edu/tr/1992/07/UW-CSE-92-07-05a.PS.Z">here</a> to get the postscript file.<P>Return to <!WA1><a href="http://www.cs.washington.edu/research/projects/weird/www/index.html">Constraints home page</a>⌨️ 快捷键说明
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