A system for interactive graphical programming

A system is described in this paper for developing graphical problem-oriented languages. This topic is of great importance in computer-aided design, but has hitherto received only sketchy documentation, with few attempts at a comparative study. Meanwhile displays are beginning to be used for design, and the results of such a study are badly needed. What has held back experimentation with computer graphics has been the difficulty of specifying new graphic techniques using the available programming languages; the method described in this paper appears to avoid this difficulty.