Python code coverage for Lib/turtledemo/fractalcurves.py

#	count	content
1	n/a	#!/usr/bin/env python3
2	n/a	""" turtle-example-suite:
3	n/a
4	n/a	tdemo_fractalCurves.py
5	n/a
6	n/a	This program draws two fractal-curve-designs:
7	n/a	(1) A hilbert curve (in a box)
8	n/a	(2) A combination of Koch-curves.
9	n/a
10	n/a	The CurvesTurtle class and the fractal-curve-
11	n/a	methods are taken from the PythonCard example
12	n/a	scripts for turtle-graphics.
13	n/a	"""
14	n/a	from turtle import *
15	n/a	from time import sleep, clock
16	n/a
17	n/a	class CurvesTurtle(Pen):
18	n/a	# example derived from
19	n/a	# Turtle Geometry: The Computer as a Medium for Exploring Mathematics
20	n/a	# by Harold Abelson and Andrea diSessa
21	n/a	# p. 96-98
22	n/a	def hilbert(self, size, level, parity):
23	n/a	if level == 0:
24	n/a	return
25	n/a	# rotate and draw first subcurve with opposite parity to big curve
26	n/a	self.left(parity * 90)
27	n/a	self.hilbert(size, level - 1, -parity)
28	n/a	# interface to and draw second subcurve with same parity as big curve
29	n/a	self.forward(size)
30	n/a	self.right(parity * 90)
31	n/a	self.hilbert(size, level - 1, parity)
32	n/a	# third subcurve
33	n/a	self.forward(size)
34	n/a	self.hilbert(size, level - 1, parity)
35	n/a	# fourth subcurve
36	n/a	self.right(parity * 90)
37	n/a	self.forward(size)
38	n/a	self.hilbert(size, level - 1, -parity)
39	n/a	# a final turn is needed to make the turtle
40	n/a	# end up facing outward from the large square
41	n/a	self.left(parity * 90)
42	n/a
43	n/a	# Visual Modeling with Logo: A Structural Approach to Seeing
44	n/a	# by James Clayson
45	n/a	# Koch curve, after Helge von Koch who introduced this geometric figure in 1904
46	n/a	# p. 146
47	n/a	def fractalgon(self, n, rad, lev, dir):
48	n/a	import math
49	n/a
50	n/a	# if dir = 1 turn outward
51	n/a	# if dir = -1 turn inward
52	n/a	edge = 2 * rad * math.sin(math.pi / n)
53	n/a	self.pu()
54	n/a	self.fd(rad)
55	n/a	self.pd()
56	n/a	self.rt(180 - (90 * (n - 2) / n))
57	n/a	for i in range(n):
58	n/a	self.fractal(edge, lev, dir)
59	n/a	self.rt(360 / n)
60	n/a	self.lt(180 - (90 * (n - 2) / n))
61	n/a	self.pu()
62	n/a	self.bk(rad)
63	n/a	self.pd()
64	n/a
65	n/a	# p. 146
66	n/a	def fractal(self, dist, depth, dir):
67	n/a	if depth < 1:
68	n/a	self.fd(dist)
69	n/a	return
70	n/a	self.fractal(dist / 3, depth - 1, dir)
71	n/a	self.lt(60 * dir)
72	n/a	self.fractal(dist / 3, depth - 1, dir)
73	n/a	self.rt(120 * dir)
74	n/a	self.fractal(dist / 3, depth - 1, dir)
75	n/a	self.lt(60 * dir)
76	n/a	self.fractal(dist / 3, depth - 1, dir)
77	n/a
78	n/a	def main():
79	n/a	ft = CurvesTurtle()
80	n/a
81	n/a	ft.reset()
82	n/a	ft.speed(0)
83	n/a	ft.ht()
84	n/a	ft.getscreen().tracer(1,0)
85	n/a	ft.pu()
86	n/a
87	n/a	size = 6
88	n/a	ft.setpos(-33size, -32size)
89	n/a	ft.pd()
90	n/a
91	n/a	ta=clock()
92	n/a	ft.fillcolor("red")
93	n/a	ft.begin_fill()
94	n/a	ft.fd(size)
95	n/a
96	n/a	ft.hilbert(size, 6, 1)
97	n/a
98	n/a	# frame
99	n/a	ft.fd(size)
100	n/a	for i in range(3):
101	n/a	ft.lt(90)
102	n/a	ft.fd(size*(64+i%2))
103	n/a	ft.pu()
104	n/a	for i in range(2):
105	n/a	ft.fd(size)
106	n/a	ft.rt(90)
107	n/a	ft.pd()
108	n/a	for i in range(4):
109	n/a	ft.fd(size*(66+i%2))
110	n/a	ft.rt(90)
111	n/a	ft.end_fill()
112	n/a	tb=clock()
113	n/a	res = "Hilbert: %.2fsec. " % (tb-ta)
114	n/a
115	n/a	sleep(3)
116	n/a
117	n/a	ft.reset()
118	n/a	ft.speed(0)
119	n/a	ft.ht()
120	n/a	ft.getscreen().tracer(1,0)
121	n/a
122	n/a	ta=clock()
123	n/a	ft.color("black", "blue")
124	n/a	ft.begin_fill()
125	n/a	ft.fractalgon(3, 250, 4, 1)
126	n/a	ft.end_fill()
127	n/a	ft.begin_fill()
128	n/a	ft.color("red")
129	n/a	ft.fractalgon(3, 200, 4, -1)
130	n/a	ft.end_fill()
131	n/a	tb=clock()
132	n/a	res += "Koch: %.2fsec." % (tb-ta)
133	n/a	return res
134	n/a
135	n/a	if __name__ == '__main__':
136	n/a	msg = main()
137	n/a	print(msg)
138	n/a	mainloop()