EXTENSIONS TO THE PIvl LANGUAGE FOR INTERACTIVE COMPUTER GRAPHICS
نویسندگان
چکیده
graphics capability, and to give the POGO user an extensive interactive computational facility. This Memorandum should therefore be of interest to systems programmers and applications programmers who are concerned with the PL/I language, with computer graphics, or with interactive programming. The PL/I language is text-oriented; it does not contain commands needed for computer graphics (e.g., "display picture p"). However, a powerful graphics capability exists within the Rand POGO system, which allows users to create pictures constructively and to file and retrieve them. This Memorandum investigates the question: "Could the PL/I language, as embodied in the CPS system, be extended to give the Video Graphic CPS user access to all the graphics facilities of the POGO system?" The Memorandum demonstrates that the answer is "yes"; surprisingly, few extensions to the PL/I syntax are needed to introduce a significant graphics capability within the language. The resulting system should allow a user of a Video Graphic console to construct and use display-oriented systems in an interactive, familiar way.
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