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Monday, October 06, 2008

Inspy from Turtle Geometry

Turtle Geometry by Harold Abelson and Andrea diSessa has a lot of interesting examples of turtle graphics. Especially I was fascinated "inspy" program. The basic structure of inspy is same as spiral. But instead of the side, value of the angle is changed in each step. I have explored a bit for a demo of Chalkboard project

To make the study easier, I made a trick to connect an event handler and an inspy program. You can play with a dynamic version of inspy program with it (Please move the mouse on next rectangle). And you may find various patterns even from such simple program. Here I present stand alone version (Only Firefox and Safari are supported).

inspi = function(side, angle, inc) {
  for (var i = 0; i < 720; i++) {
    right(angle + inc * i)
inspi(15, mouseX(), mouseY())


  1. Very nice. I really like the simple rules that generate complex patterns.

  2. I am thinking using this idea to create other drawing using different functions. This is a pretty interesting digital art!

  3. Yes, there are still a lot of interesting ideas in old days. Especially because we have huge computer power compared to the time when turtle graphics was invented, I think we should revisit those ideas again.


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