http://www.rosettacode.org/wiki/Fractal_tree#J
I had updated the fractal tree implementation to work with j903. (The
previous code did not work with any implementation of J which I have
installed on my mac -- apparently Apple's changes mean that j504 and
j602 no longer function on this machine.)
However, I noticed that the window is slow to come up, and I cannot resize it,
So, I changed the implementation:
require'gl2'
L0=: 50 NB. initial length
A0=: 1r8p1 NB. initial angle: pi divided by 8
dL=: 0.9 NB. shrink factor for length
dA=: 0.75 NB. shrink factor for angle
N=: 14 NB. number of branches
L=: L0*dL^1+i.N NB. lengths of line segments
NB. relative angles of successive line segments
A=: A0*(dA^i.N) +/\@:*("1) _1 ^ #:i.2 ^ N
NB. end points for each line segment
P=: 0 0+/\@,"2 +.*.inv (L0,0),"2 L,"0"1 A
wd {{)n
pc P closeok;
setp wh 480 640;
cc C isidraw;
pshow;
}}
glclear_jgl2_''
gllines_jgl2_ <.@(10 + ,/"2 P-"1<./,/P)
But this version does not draw the fractal tree.
Has anyone been able to get gllines to work in an isidraw?
Thanks,
--
Raul
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