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Q6X c \ 2 s \ \ 2 \ 2 P! P! )ar turtledemo/tree.py
Displays a 'breadth-first-tree' - in contrast
to the classical Logo tree drawing programs,
which use a depth-first-algorithm.
Uses:
(1) a tree-generator, where the drawing is
quasi the side-effect, whereas the generator
always yields None.
(2) Turtle-cloning: At each branching point
the current pen is cloned. So in the end
there are 1024 turtles.
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P! P! 3h)z�plist is list of pens
l is length of branch
a is half of the angle between 2 branches
f is factor by which branch is shortened
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