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1#!/usr/bin/env python3
2"""     turtlegraphics-example-suite:
3
4             tdemo_forest.py
5
6Displays a 'forest' of 3 breadth-first-trees
7similar to the one in tree.
8For further remarks see tree.py
9
10This example is a 'breadth-first'-rewrite of
11a Logo program written by Erich Neuwirth. See
12http://homepage.univie.ac.at/erich.neuwirth/
13"""
14from turtle import Turtle, colormode, tracer, mainloop
15from random import randrange
16from time import perf_counter as clock
17
18def symRandom(n):
19    return randrange(-n,n+1)
20
21def randomize( branchlist, angledist, sizedist ):
22    return [ (angle+symRandom(angledist),
23              sizefactor*1.01**symRandom(sizedist))
24                     for angle, sizefactor in branchlist ]
25
26def randomfd( t, distance, parts, angledist ):
27    for i in range(parts):
28        t.left(symRandom(angledist))
29        t.forward( (1.0 * distance)/parts )
30
31def tree(tlist, size, level, widthfactor, branchlists, angledist=10, sizedist=5):
32    # benutzt Liste von turtles und Liste von Zweiglisten,
33    # fuer jede turtle eine!
34    if level > 0:
35        lst = []
36        brs = []
37        for t, branchlist in list(zip(tlist,branchlists)):
38            t.pensize( size * widthfactor )
39            t.pencolor( 255 - (180 - 11 * level + symRandom(15)),
40                        180 - 11 * level + symRandom(15),
41                        0 )
42            t.pendown()
43            randomfd(t, size, level, angledist )
44            yield 1
45            for angle, sizefactor in branchlist:
46                t.left(angle)
47                lst.append(t.clone())
48                brs.append(randomize(branchlist, angledist, sizedist))
49                t.right(angle)
50        for x in tree(lst, size*sizefactor, level-1, widthfactor, brs,
51                      angledist, sizedist):
52            yield None
53
54
55def start(t,x,y):
56    colormode(255)
57    t.reset()
58    t.speed(0)
59    t.hideturtle()
60    t.left(90)
61    t.penup()
62    t.setpos(x,y)
63    t.pendown()
64
65def doit1(level, pen):
66    pen.hideturtle()
67    start(pen, 20, -208)
68    t = tree( [pen], 80, level, 0.1, [[ (45,0.69), (0,0.65), (-45,0.71) ]] )
69    return t
70
71def doit2(level, pen):
72    pen.hideturtle()
73    start(pen, -135, -130)
74    t = tree( [pen], 120, level, 0.1, [[ (45,0.69), (-45,0.71) ]] )
75    return t
76
77def doit3(level, pen):
78    pen.hideturtle()
79    start(pen, 190, -90)
80    t = tree( [pen], 100, level, 0.1, [[ (45,0.7), (0,0.72), (-45,0.65) ]] )
81    return t
82
83# Hier 3 Baumgeneratoren:
84def main():
85    p = Turtle()
86    p.ht()
87    tracer(75,0)
88    u = doit1(6, Turtle(undobuffersize=1))
89    s = doit2(7, Turtle(undobuffersize=1))
90    t = doit3(5, Turtle(undobuffersize=1))
91    a = clock()
92    while True:
93        done = 0
94        for b in u,s,t:
95            try:
96                b.__next__()
97            except:
98                done += 1
99        if done == 3:
100            break
101
102    tracer(1,10)
103    b = clock()
104    return "runtime: %.2f sec." % (b-a)
105
106if __name__ == '__main__':
107    main()
108    mainloop()
109