APLG-An APL based system for interactive computer graphics

  • Authors:

  • W. K. Giloi;J. Encarnacao

  • Affiliations:

  • Universitat des Saarlandes, Germany;Universitat des Saarlandes, Germany

  • Venue:
  • AFIPS '74 Proceedings of the May 6-10, 1974, national computer conference and exposition
  • Year:
  • 1974

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Abstract

Computer Graphics (CG) is in its essence interactive. The customary "batch processing" languages such as, for example, FORTRAN, ALGOL, PL/I, ..., are not primarily designed for interactive use. One of the main reasons for that is their relatively early binding time. Another handicap, particularly for CG, is a certain inadequacy of their control structure for the kind of dialog characterizing CG. Thus, the usual programming packages for CG based on one of the above mentioned high-level languages have to be augmented by devices which allow the system to lend control to the user, together with a simple command language which enables the user to execute temporarily control over the system. The commands are given to a command language processor which works interpretatively, initiating, for instance, respective subroutine calls.