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Co-authored-by: Wulian <xiguawulian@gmail.com> Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
64 lines
1.3 KiB
Python
64 lines
1.3 KiB
Python
"""turtledemo/rosette.py
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This example is
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inspired by the Wikipedia article on turtle
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graphics. (See example wikipedia1 for URLs)
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First we create (ne-1) (i.e. 35 in this
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example) copies of our first turtle p.
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Then we let them perform their steps in
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parallel.
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Followed by a complete undo().
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"""
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from turtle import Screen, Turtle, mainloop
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from time import perf_counter as clock, sleep
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def mn_eck(p, ne,sz):
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turtlelist = [p]
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#create ne-1 additional turtles
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for i in range(1,ne):
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q = p.clone()
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q.rt(360.0/ne)
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turtlelist.append(q)
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p = q
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for i in range(ne):
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c = abs(ne/2.0-i)/(ne*.7)
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# let those ne turtles make a step
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# in parallel:
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for t in turtlelist:
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t.rt(360./ne)
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t.pencolor(1-c,0,c)
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t.fd(sz)
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def main():
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s = Screen()
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s.bgcolor("black")
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p=Turtle()
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p.speed(0)
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p.hideturtle()
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p.pencolor("red")
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p.pensize(3)
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s.tracer(36,0)
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at = clock()
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mn_eck(p, 36, 19)
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et = clock()
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z1 = et-at
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sleep(1)
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at = clock()
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while any(t.undobufferentries() for t in s.turtles()):
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for t in s.turtles():
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t.undo()
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et = clock()
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return "runtime: %.3f sec" % (z1+et-at)
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if __name__ == '__main__':
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msg = main()
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print(msg)
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mainloop()
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