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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

import turtle

from polygon import arc

def petal(t, r, angle):

"""Draws a petal using two arcs.

t: Turtle

r: radius of the arcs

angle: angle (degrees) that subtends the arcs

"""

for i in range(2):

arc(t, r, angle)

t.lt(180-angle)

def flower(t, n, r, angle):

"""Draws a flower with n petals.

t: Turtle

n: number of petals

r: radius of the arcs

angle: angle (degrees) that subtends the arcs

"""

for i in range(n):

petal(t, r, angle)

t.lt(360.0/n)

def move(t, length):

"""Move Turtle (t) forward (length) units without leaving a trail.

Leaves the pen down.

"""

t.pu()

t.fd(length)

t.pd()

bob = turtle.Turtle()

# draw a sequence of three flowers, as shown in the book.

move(bob, -100)

flower(bob, 7, 60.0, 60.0)

move(bob, 100)

flower(bob, 10, 40.0, 80.0)

move(bob, 100)

flower(bob, 20, 140.0, 20.0)

bob.hideturtle()

turtle.mainloop()