http:^^www.cs.washington.edu^research^projects^weird^www^skyblue-uist-94.html

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Date: Tue, 10 Dec 1996 03:25:02 GMTServer: NCSA/1.4.2Content-type: text/html<html><head><TITLE>SkyBlue: A Multi-Way Local Propagation Constraint Solver for UserInterface Construction</title></head><body><H2>SkyBlue: A Multi-Way Local Propagation Constraint Solver for UserInterface Construction</H2><p>Author: Michael Sannella<p>In <em>Proceedings of the 1994 ACM Symposium on User Interface Software andTechnology</em>, pages 137-146.<P><hr><H3>Abstract</H3>Many user interface toolkits use constraint solvers to maintain geometricrelationships between graphic objects, or to connect the graphics to theapplication data structures.  One efficient and flexible technique formaintaining constraints is multi-way local propagation, where constraintsare represented by sets of <em>method</em> procedures.  To satisfy a set ofconstraints, a local propagation solver executes one method from eachconstraint.<P>SkyBlue is an incremental constraint solver that uses local propagation tomaintain a set of constraints as individual constraints are added andremoved.  If all of the constraints cannot be satisfied, SkyBlue leavesweaker constraints unsatisfied in order to satisfy stronger constraints(maintaining a constraint hierarchy).  SkyBlue is a more general successorto the DeltaBlue algorithm that satisfies cycles of methods by callingexternal cycle solvers and supports multi-output methods.  These featuresmake SkyBlue more useful for constructing user interfaces, since cycles ofconstraints can occur frequently in user interface applications andmulti-output methods are necessary to represent some useful constraints.This paper discusses some of the applications that use SkyBlue, presentstimes for some user interface benchmarks and describes the SkyBluealgorithm in detail.<P><HR><P>Click <!WA0><a href="ftp://cs.washington.edu/pub/constraints/papers/skyblue-uist-94.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>

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