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__init__.py
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__main__.py
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bytedesign.py
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chaos.py
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clock.py
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colormixer.py
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forest.py
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lindenmayer.py
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minimal_hanoi.py
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nim.py
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paint.py
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peace.py
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penrose.py
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planet_and_moon.py
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rosette.py
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round_dance.py
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sorting_animate.py
4.93
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tree.py
1.37
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turtle.cfg
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two_canvases.py
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Code Editor : tree.py
#!/usr/bin/env python3 """ 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. """ from turtle import Turtle, mainloop from time import perf_counter as clock def tree(plist, l, a, f): """ 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 from level to level.""" if l > 3: lst = [] for p in plist: p.forward(l) q = p.clone() p.left(a) q.right(a) lst.append(p) lst.append(q) for x in tree(lst, l*f, a, f): yield None def maketree(): p = Turtle() p.setundobuffer(None) p.hideturtle() p.speed(0) p.getscreen().tracer(30,0) p.left(90) p.penup() p.forward(-210) p.pendown() t = tree([p], 200, 65, 0.6375) for x in t: pass def main(): a=clock() maketree() b=clock() return "done: %.2f sec." % (b-a) if __name__ == "__main__": msg = main() print(msg) mainloop()
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