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exercise2.py
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exercise2.py
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from turtle import Turtle, Screen
import math
bob = Turtle(shape="turtle")
print(bob)
def square(t, distance):
for i in range(4):
t.forward(distance)
t.left(90)
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):
t.fd(length)
t.lt(angle)
def polygon(t, n, length):
"""Draws a 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 * math.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
t.lt(step_angle/2)
polyline(t, n, step_length, step_angle)
t.rt(step_angle/2)
def circle(t, r):
"""Draws a circle with the given radius.
t: Turtle
r: radius
"""
arc(t, r, 360)
# bob._delay(0.01)
bob.penup()
radius = 250
square(bob, radius)
bob.rt(90)
bob.fd(150)
bob.rt(90)
bob.fd(30)
bob.rt(180)
bob.pendown()
bob._delay(0.01)
circle(bob, radius)
bob.penup()
# bob._delay(30)
# polygon(bob, 7, 250)
screen = Screen()
screen.exitonclick()
# bob = Turtle()
# print(bob)
# a = input("press")