procedure fstar: fractal stars
link fstars
May 23, 1996; Ralph E. Griswold
This file is in the public domain.
This procedure produces traces of fractal "stars". For a discussion of
fractal stars, see
Fractals; Endlessly Repeated Geometrical Figures, Hans Lauwerier,
Princeton University Press, 1991, pp. 72-77.
and
Geometric and Artistic Graphics; Design Generation with
Microcomputers, Jean-Paul Delahaye, Macmillan, 1987, pp. 55-63.
The arguments are:
x, y, n, p, r, incr, extent
x x coordinate of the initial point, default 0
y y coordinate of the initial point, default 0.5
n number of vertices, default 5
p number of phases, default 5
r reduction factor, default 0.35
incr angular increment factor, default 0.8
extent extent of drawing, 1.0
Chosing values for these arguments that produce interesting results and
centering the star in the window is somewhat of an art. See fstartbl.icn
for some good values.