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Prolog turtle graphics.

lang/prolog/code/io/turtle/
This is a simple turtle graphics program for vt100 terminals written by David Lau-Kee and originally posted to the Prolog Digest. A few syntactic errors were corrected by Salleh Mustaffa, University of Manchester. There may be some problems due to control characters in the program not being properly transmitted through email in the original posting. A limited subset of turtle graphics capabilities is implemented: You can tell the turtle to turn 90 degrees clockwise or anticlockwise, and to move forward X steps. Backtracking over these primitives causes them to be undone.
Origin:   

   src.doc.ic.ac.uk:packages/prolog-pd-software/ (146.169.2.1)
   as turtle.tar.Z

Version: 12-DEC-87 (25-MAR-87) Requires: VT100 terminal. The cursor-moving commands are terminal-specific. Ports: Runs in C-Prolog 1.5 and should be easily portable to Edinburgh-compatible Prologs. Copying: Copyright (c) 1987 by David Lau-Kee, University of York. Use, modification, copying, and distribution permitted. CD-ROM: Prime Time Freeware for AI, Issue 1-1 Author(s): David Lau-Kee University of York Keywords: Authors!Lau-Kee, GUI!Prolog, IO, Prolog!Code, Prolog!IO, Turtle Graphics, Univ. of York References: ?
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