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GHe � n d S( s� turtle-example-suite:
tdemo_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.
i����( t Turtlet mainloop( t clockc c s� | d k r� g } x[ | D]S } | j | � | j � } | j | � | j | � | j | � | j | � q Wx) t | | | | | � D] } d Vq� Wn d S( s� 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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