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The evolution of a graphics system for linked computers
Author(s) -
Kilgour A. C.
Publication year - 1971
Publication title -
software: practice and experience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 70
eISSN - 1097-024X
pISSN - 0038-0644
DOI - 10.1002/spe.4380010308
Subject(s) - graphics , computer science , computer graphics (images) , function (biology) , identification (biology) , computer hardware , human–computer interaction , botany , evolutionary biology , biology
The development of a comprehensive two‐dimensional graphics package for an ICL 4130 with a high‐speed data link to a DEC PDP‐7 with Type 340 refreshed C.R.T. display and light pen is traced from its origin as a package of ALGOL procedures for graphical output. The design criteria imposed by the requirements for light‐pen tracking and identification of picture parts are described, and decisions which affected the subsequent development of the sysetm are identified and commented upon. The various types of display file editing which may be performed are described, and a facility mentioned for saving display files on the backing store of the PDP‐7. The idea of a ‘fixed‐function satellite’ is introduced and its potential usefulness in other operating environments discussed.