GVU Technical Report Number:
GIT-GVU-93-18
Title:
A Notation for the Visual Specification of Geometric Relations in
Rule-Based User Interface Development Environments
Authors:
Andrey K. Yeatts
Scott E. Hudson
Abstract:
This paper describes a new visual notation for specifying geometric
relationships (for example, in a user interface presentation application).
This notation is designed to provide a centerpiece for the visual
specification of predicates and rules in the BluePrint rule-based user
interface development environment. The notation, while simple and using
only a handful of operator symbols, is extremely powerful and expressive.
It operates in an intuitive fashion using analogies to the physically
based concepts of alignment and measurement to express a wide range of
linear relationships between presentation objects, and can be used to
express dynamic as well as static properties.
Keywords:
Visual notation, geometric relationships, user interface, BluePrint
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