A model of interaction for graphical systems

Abstract

In this paper we present a model suitable for the description of interactive graphics programs within the framework defined by the Reference Model for Computer Graphics Systems, actually under development within the International Organization for Standardization. An overview of the state of the art techniques currently used to describe user interfaces is given togheter with the Seeheim model. The attention is focused on the Presentation Component, where problems resulting from different approaches are outlined and discussed. The architecture defined by the Computer Graphics Reference Model, at its actual state of development, is then presented. Following, the components of an interaction are identified and described as a set of processes within a logical device or interactor. Interactors are the basic components from which interactive graphics programs can be modeled; that is an interactive graphics program is seen as a set of independent processes that make use of interactors. Relationships between interactors are described by means of acyclic graphs that realize the control structure of the dialogue. In that way it is possible to allow for modularity and parallelism: in particular the user may interact with several parts of the program (or with several programs) simultaneously.KeywordsComputer GraphicInput DeviceGraphic SystemLogical DevicePresentation ComponentThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.