four dimensional goodness - ben fry
originally completed sometime in december of 2000,
updated for processing in february 2005

based largely on what i learned/ported from HYPRCUBE.BAS
found in the following article by Ken Holmes (kholmes at melbpc.org.au)
http://www.melbpc.org.au/pcupdate/9907/9907article10.htm

this was my initial code to figure out how these things work,
which i later ported up to an arbtitrary number of dimensions
for the "atmosphere" project. see:
http://acg.media.mit.edu/projects/atmosphere
http://acg.media.mit.edu/people/fry/atmosphere

  space  to enable/disable auto-movement
      t  to show/hide the text

x y z w  to wiggle in each of the four dimensions
  1 2 3  to manually rotate with respect to each plane

    f s  to move faster or slower

vector font code ported from code by jared schiffman and i from
the acg's internal graphics library "acu". vector font by josh nimoy.

the integrator is my simple spring-based integrator class.