In each animation r is initalized to a number rmin < 1,
incremented by dr = .0003 until r = rmax > 1.
If you choose close-up (by clicking in the box labeled "close-up"),
rmin = .985 and rmax = 1.0125, if you
choose normal, rmin = .99 and rmax = 1.4. (Default is normal.)
For each r, 400 points
in the orbit of 0 are plotted using the function
f(z) = z^2 + c
where c = (r*e^(i*2*pi*alpha))/2 - (r^2*e^(i*4*pi*alpha)/4)
By clicking in the appropriate box you may choose one of 4 ways to
increment alpha:
Rational: alpha takes on the values 1/2, 1/3, 1/4, 1/5, ...
Irrational: alpha starts at 0.1437120163 increases by increments of
.0031415926
Random: alpha is chosen at random from the interval [0,1]
"Almost rational": alpha takes on the values 1/2 +.001, 1/3 +.001,
1/4 + .001, ...