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9c01db40aa
Co-authored-by: Wulian <xiguawulian@gmail.com> Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
81 lines
1.7 KiB
Python
81 lines
1.7 KiB
Python
"""turtledemo/round_dance.py
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Dancing turtles have a compound shape
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consisting of a series of triangles of
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decreasing size.
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Turtles march along a circle while rotating
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pairwise in opposite direction, with one
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exception. Does that breaking of symmetry
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enhance the attractiveness of the example?
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Press any key to stop the animation.
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Technically: demonstrates use of compound
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shapes, transformation of shapes as well as
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cloning turtles. The animation is
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controlled through update().
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"""
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from turtle import *
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def stop():
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global running
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running = False
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def main():
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global running
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clearscreen()
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bgcolor("gray10")
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tracer(False)
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shape("triangle")
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f = 0.793402
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phi = 9.064678
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s = 5
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c = 1
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# create compound shape
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sh = Shape("compound")
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for i in range(10):
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shapesize(s)
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p =get_shapepoly()
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s *= f
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c *= f
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tilt(-phi)
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sh.addcomponent(p, (c, 0.25, 1-c), "black")
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register_shape("multitri", sh)
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# create dancers
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shapesize(1)
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shape("multitri")
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pu()
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setpos(0, -200)
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dancers = []
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for i in range(180):
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fd(7)
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tilt(-4)
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lt(2)
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update()
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if i % 12 == 0:
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dancers.append(clone())
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home()
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# dance
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running = True
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onkeypress(stop)
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listen()
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cs = 1
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while running:
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ta = -4
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for dancer in dancers:
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dancer.fd(7)
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dancer.lt(2)
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dancer.tilt(ta)
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ta = -4 if ta > 0 else 2
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if cs < 180:
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right(4)
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shapesize(cs)
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cs *= 1.005
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update()
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return "DONE!"
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if __name__=='__main__':
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print(main())
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mainloop()
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