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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())
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