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4.1.py
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91 lines (74 loc) · 1.91 KB
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#coding:utf-8
from math import *
from swampy.TurtleWorld import *
def square(t, length):
"""
Draws a square with sides of the given length.
Returns the Turtle to the starting position and location.
t: Turtle
length: Side length of square
"""
for i in range(4):
fd(t, length)
lt(t)
def polyline(t, n, length, angle):
"""
Draws n line segments.
t: Turtle object
n: number of line segments
length: length of each segment
angle: degrees between segments
"""
for i in range(n):
fd(t, length)
lt(t, angle)
world = TurtleWorld()
ray = Turtle()
# polyline(ray, 5, 50, 125)
def polygon(t, n, length):
"""
Draws a regular polygon with n sides.
t: Turtle
n: number of sides
length: length of each side.
"""
angle = 360.0/n
polyline(t, n, length, angle)
def arc(t, r, angle):
"""
Draws an arc with the given radius and angle.
t: Turtle
r: radius
angle: angle subtended by the arc, in degrees
"""
arc_length = 2 * pi * r * abs(angle) / 360
n = int(arc_length / 4) + 1
step_length = arc_length / n
step_angle = float(angle) / n
# making a slight left turn before starting reduces
# the error caused by the linear approximation of the arc
lt(t, step_angle/2)
polyline(t, n, step_length, step_angle)
rt(t, step_angle/2)
ray.delay = 0.01
arc(ray, 20, 270)
wait_for_user()
def circle(t, r):
"""
Draws a circle with the given radius.
t: Turtle
r: radius
"""
arc(t, r, 360)
if __name__ == '__main__':
world = TurtleWorld()
bob = Turtle()
bob.delay = 0.001
radius = 80 #圆的半径
#打印第一个大半圆
pu(bob)
fd(bob, radius)
lt(bob)
pd(bob)
circle(bob, radius) #第二个完整的圆
wait_for_user()