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TO COMPUTER GRAPHICS BASED ONGKS Part I gives an introduction to
basic concepts of computer graph ics and to the principles and
concepts of GKS. The aims of this part are twofold: to provide the
beginner with an overview of the terminology and concepts of
computer graphics, based on GKS, and to give the computer graphics
expert an introduc tion to the GKS standard. In the early chapters
of this part, the main areas of computer graphics, the various
classes of com puter graphics users, the interfaces of GKS and its
underlying design concepts are discussed and important terms are
defined. The later chapters give an informal introduction to the
main concepts of GKS and their interrelationships: output,
attributes, coordinate systems, transformations, input, segments,
metafile, state lists, and error handling. This introduction to the
GKS framework will prepare the ground for the detailed description
of 2D GKS functions in Part III and the 3D extensions to GKS in
Part IV. 1 WHAT IS COMPUTER GRAPHICS? 1. 1 Defmition of Computer
Graphics The Data Processing Vocabulary of the International
Organization for Stan dardization (ISO) ISO 84] defines Computer
Graphics as follows: "Methods and techniques for converting data to
and from a graphic display via computer. " This definition refers
to three basic components of any computer graphics system - namely
"data," "computer," and "display.""
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