HAGI, a High-level Application/Graphics Interface

Abstract

HAGI is an object-oriented graphics system developed on top of the X window system. In addition to providing facilities that structured graphics systems such as GKS usually have, HAGI supports a high- level graphics paradigm with the following features: + In addition to graphical objects, the system provides a class of application objects with a higher level of abstraction than graphical objects. + Graphics manipulation operations can be issued simplyfrom application objects without explicitly referring to specific graphical objects. Thus graphics manipulation appears to be transparent to application programmers. + Graphical objects are designed to encompass more semantics, thus are at a level close to the application. For example, they useflexible visual objects to determine their visual appearance. HAGI provides such a high-level application/graphics interface by maintaining a dependency relationship between graphical objects and application objects.