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1 #!/usr/bin/env python3
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2 """ turtlegraphics-example-suite:
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3
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4 tdemo_forest.py
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5
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6 Displays a 'forest' of 3 breadth-first-trees
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7 similar to the one in tree.
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8 For further remarks see tree.py
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9
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10 This example is a 'breadth-first'-rewrite of
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11 a Logo program written by Erich Neuwirth. See
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12 http://homepage.univie.ac.at/erich.neuwirth/
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13 """
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14 from turtle import Turtle, colormode, tracer, mainloop
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15 from random import randrange
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16 from time import perf_counter as clock
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17
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18 def symRandom(n):
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19 return randrange(-n,n+1)
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20
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21 def randomize( branchlist, angledist, sizedist ):
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22 return [ (angle+symRandom(angledist),
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23 sizefactor*1.01**symRandom(sizedist))
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24 for angle, sizefactor in branchlist ]
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25
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26 def randomfd( t, distance, parts, angledist ):
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27 for i in range(parts):
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28 t.left(symRandom(angledist))
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29 t.forward( (1.0 * distance)/parts )
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30
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31 def tree(tlist, size, level, widthfactor, branchlists, angledist=10, sizedist=5):
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32 # benutzt Liste von turtles und Liste von Zweiglisten,
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33 # fuer jede turtle eine!
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34 if level > 0:
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35 lst = []
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36 brs = []
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37 for t, branchlist in list(zip(tlist,branchlists)):
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38 t.pensize( size * widthfactor )
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39 t.pencolor( 255 - (180 - 11 * level + symRandom(15)),
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40 180 - 11 * level + symRandom(15),
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41 0 )
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42 t.pendown()
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43 randomfd(t, size, level, angledist )
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44 yield 1
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45 for angle, sizefactor in branchlist:
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46 t.left(angle)
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47 lst.append(t.clone())
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48 brs.append(randomize(branchlist, angledist, sizedist))
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49 t.right(angle)
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50 for x in tree(lst, size*sizefactor, level-1, widthfactor, brs,
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51 angledist, sizedist):
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52 yield None
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53
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54
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55 def start(t,x,y):
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56 colormode(255)
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57 t.reset()
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58 t.speed(0)
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59 t.hideturtle()
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60 t.left(90)
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61 t.penup()
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62 t.setpos(x,y)
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63 t.pendown()
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64
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65 def doit1(level, pen):
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66 pen.hideturtle()
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67 start(pen, 20, -208)
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68 t = tree( [pen], 80, level, 0.1, [[ (45,0.69), (0,0.65), (-45,0.71) ]] )
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69 return t
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70
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71 def doit2(level, pen):
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72 pen.hideturtle()
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73 start(pen, -135, -130)
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74 t = tree( [pen], 120, level, 0.1, [[ (45,0.69), (-45,0.71) ]] )
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75 return t
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76
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77 def doit3(level, pen):
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78 pen.hideturtle()
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79 start(pen, 190, -90)
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80 t = tree( [pen], 100, level, 0.1, [[ (45,0.7), (0,0.72), (-45,0.65) ]] )
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81 return t
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82
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83 # Hier 3 Baumgeneratoren:
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84 def main():
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85 p = Turtle()
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86 p.ht()
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87 tracer(75,0)
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88 u = doit1(6, Turtle(undobuffersize=1))
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89 s = doit2(7, Turtle(undobuffersize=1))
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90 t = doit3(5, Turtle(undobuffersize=1))
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91 a = clock()
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92 while True:
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93 done = 0
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94 for b in u,s,t:
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95 try:
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96 b.__next__()
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97 except:
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98 done += 1
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99 if done == 3:
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100 break
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101
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102 tracer(1,10)
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103 b = clock()
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104 return "runtime: %.2f sec." % (b-a)
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105
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106 if __name__ == '__main__':
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107 main()
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108 mainloop()
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