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9c01db40aa
Co-authored-by: Wulian <xiguawulian@gmail.com> Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
104 lines
2.8 KiB
Python
104 lines
2.8 KiB
Python
"""turtledemo/forest.py
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Displays a 'forest' of 3 breadth-first trees,
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similar to the one in tree.py.
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For further details, see tree.py.
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This example is a breadth-first rewrite of
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a Logo program by Erich Neuwirth.
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"""
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from turtle import Turtle, colormode, tracer, mainloop
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from random import randrange
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from time import perf_counter as clock
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def symRandom(n):
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return randrange(-n,n+1)
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def randomize( branchlist, angledist, sizedist ):
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return [ (angle+symRandom(angledist),
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sizefactor*1.01**symRandom(sizedist))
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for angle, sizefactor in branchlist ]
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def randomfd( t, distance, parts, angledist ):
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for i in range(parts):
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t.left(symRandom(angledist))
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t.forward( (1.0 * distance)/parts )
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def tree(tlist, size, level, widthfactor, branchlists, angledist=10, sizedist=5):
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# benutzt Liste von turtles und Liste von Zweiglisten,
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# fuer jede turtle eine!
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if level > 0:
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lst = []
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brs = []
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for t, branchlist in list(zip(tlist,branchlists)):
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t.pensize( size * widthfactor )
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t.pencolor( 255 - (180 - 11 * level + symRandom(15)),
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180 - 11 * level + symRandom(15),
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0 )
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t.pendown()
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randomfd(t, size, level, angledist )
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yield 1
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for angle, sizefactor in branchlist:
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t.left(angle)
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lst.append(t.clone())
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brs.append(randomize(branchlist, angledist, sizedist))
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t.right(angle)
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for x in tree(lst, size*sizefactor, level-1, widthfactor, brs,
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angledist, sizedist):
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yield None
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def start(t,x,y):
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colormode(255)
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t.reset()
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t.speed(0)
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t.hideturtle()
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t.left(90)
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t.penup()
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t.setpos(x,y)
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t.pendown()
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def doit1(level, pen):
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pen.hideturtle()
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start(pen, 20, -208)
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t = tree( [pen], 80, level, 0.1, [[ (45,0.69), (0,0.65), (-45,0.71) ]] )
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return t
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def doit2(level, pen):
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pen.hideturtle()
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start(pen, -135, -130)
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t = tree( [pen], 120, level, 0.1, [[ (45,0.69), (-45,0.71) ]] )
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return t
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def doit3(level, pen):
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pen.hideturtle()
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start(pen, 190, -90)
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t = tree( [pen], 100, level, 0.1, [[ (45,0.7), (0,0.72), (-45,0.65) ]] )
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return t
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# Hier 3 Baumgeneratoren:
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def main():
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p = Turtle()
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p.ht()
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tracer(75,0)
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u = doit1(6, Turtle(undobuffersize=1))
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s = doit2(7, Turtle(undobuffersize=1))
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t = doit3(5, Turtle(undobuffersize=1))
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a = clock()
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while True:
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done = 0
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for b in u,s,t:
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try:
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b.__next__()
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except:
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done += 1
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if done == 3:
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break
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tracer(1,10)
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b = clock()
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return "runtime: %.2f sec." % (b-a)
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if __name__ == '__main__':
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main()
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mainloop()
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