Interactive Epicycloids

Intetractive version of the rolling epicycloids described by John Baez (and others) at: http://johncarlosbaez.wordpress.com/2013/12/03/rolling-hypocycloids/#comment-34678 Javascript and GeoGebra versions at: http://www.malinc.se/m/RollingHypocycloids.php

Move the white dots!