Turtle graphics: hidden features in APL2

  • Authors:

  • Hendrik Rama

  • Affiliations:

  • Technical University of Berlin, Germany, Trabener Str. 18 c, D14193 Berlin, Germany

  • Venue:
  • APL '98 Proceedings of the APL98 conference on Array processing language
  • Year:
  • 1998

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Abstract

Twenty-five years ago Martin Gardner wrote an article in "Mathematical Games" of the Scientific American with the title Fantastic patterns traced by programmed "Worms" [Gar 1]. Later on these worms were called "turtles". These turtle graphics are well known from the LOGO-system [Ab/diS].These graphics are also vector graphics not made by setting absolute coordinates but by setting relative increments of distances and angles. With tiny APL2 idioms I have developed many 2D-graphics. It has happened in a short time in a normal manner and as a dialogue form. My top is "one-liner as eye liner"