Python code coverage for Lib/turtledemo/lindenmayer.py

#	count	content
1	n/a	#!/usr/bin/env python3
2	n/a	""" turtle-example-suite:
3	n/a
4	n/a	xtx_lindenmayer_indian.py
5	n/a
6	n/a	Each morning women in Tamil Nadu, in southern
7	n/a	India, place designs, created by using rice
8	n/a	flour and known as kolam on the thresholds of
9	n/a	their homes.
10	n/a
11	n/a	These can be described by Lindenmayer systems,
12	n/a	which can easily be implemented with turtle
13	n/a	graphics and Python.
14	n/a
15	n/a	Two examples are shown here:
16	n/a	(1) the snake kolam
17	n/a	(2) anklets of Krishna
18	n/a
19	n/a	Taken from Marcia Ascher: Mathematics
20	n/a	Elsewhere, An Exploration of Ideas Across
21	n/a	Cultures
22	n/a
23	n/a	"""
24	n/a	################################
25	n/a	# Mini Lindenmayer tool
26	n/a	###############################
27	n/a
28	n/a	from turtle import *
29	n/a
30	n/a	def replace( seq, replacementRules, n ):
31	n/a	for i in range(n):
32	n/a	newseq = ""
33	n/a	for element in seq:
34	n/a	newseq = newseq + replacementRules.get(element,element)
35	n/a	seq = newseq
36	n/a	return seq
37	n/a
38	n/a	def draw( commands, rules ):
39	n/a	for b in commands:
40	n/a	try:
41	n/a	rules[b]()
42	n/a	except TypeError:
43	n/a	try:
44	n/a	draw(rules[b], rules)
45	n/a	except:
46	n/a	pass
47	n/a
48	n/a
49	n/a	def main():
50	n/a	################################
51	n/a	# Example 1: Snake kolam
52	n/a	################################
53	n/a
54	n/a
55	n/a	def r():
56	n/a	right(45)
57	n/a
58	n/a	def l():
59	n/a	left(45)
60	n/a
61	n/a	def f():
62	n/a	forward(7.5)
63	n/a
64	n/a	snake_rules = {"-":r, "+":l, "f":f, "b":"f+f+f--f--f+f+f"}
65	n/a	snake_replacementRules = {"b": "b+f+b--f--b+f+b"}
66	n/a	snake_start = "b--f--b--f"
67	n/a
68	n/a	drawing = replace(snake_start, snake_replacementRules, 3)
69	n/a
70	n/a	reset()
71	n/a	speed(3)
72	n/a	tracer(1,0)
73	n/a	ht()
74	n/a	up()
75	n/a	backward(195)
76	n/a	down()
77	n/a	draw(drawing, snake_rules)
78	n/a
79	n/a	from time import sleep
80	n/a	sleep(3)
81	n/a
82	n/a	################################
83	n/a	# Example 2: Anklets of Krishna
84	n/a	################################
85	n/a
86	n/a	def A():
87	n/a	color("red")
88	n/a	circle(10,90)
89	n/a
90	n/a	def B():
91	n/a	from math import sqrt
92	n/a	color("black")
93	n/a	l = 5/sqrt(2)
94	n/a	forward(l)
95	n/a	circle(l, 270)
96	n/a	forward(l)
97	n/a
98	n/a	def F():
99	n/a	color("green")
100	n/a	forward(10)
101	n/a
102	n/a	krishna_rules = {"a":A, "b":B, "f":F}
103	n/a	krishna_replacementRules = {"a" : "afbfa", "b" : "afbfbfbfa" }
104	n/a	krishna_start = "fbfbfbfb"
105	n/a
106	n/a	reset()
107	n/a	speed(0)
108	n/a	tracer(3,0)
109	n/a	ht()
110	n/a	left(45)
111	n/a	drawing = replace(krishna_start, krishna_replacementRules, 3)
112	n/a	draw(drawing, krishna_rules)
113	n/a	tracer(1)
114	n/a	return "Done!"
115	n/a
116	n/a	if __name__=='__main__':
117	n/a	msg = main()
118	n/a	print(msg)
119	n/a	mainloop()