Chapter 2: Draw Circle using Turtle Graphics

Adapted from: “Python Playground: Geeky Projects for the Curious Programmer” by Mahesh Venkitachalam (No Starch Press)

This program demonstrates drawing a circle using turtle graphics. This is very similar to using the LOGO language for years gone by.

In file drawcircle.py

import math
import turtle

# draw the circle using turtle
def drawCircleTurtle(x, y, r):
	# move to the start of the circle
	turtle.up()
	turtle.setpos(x + r, y)
	turtle.down()

	# draw the circle
	for i in range(0, 365, 5):
		a = math.radians(i)
		turtle.setpos(x + r * math.cos(a), y + r * math.sin(a))

drawCircleTurtle(100, 100, 50)
turtle.mainloop()

The above program is directly into Jupyter Lab and executed by the Python Kernel:

Load and Run the Program in Jupyter Lab

import os
root_dir = ""
root_dir = os.getcwd()

code_dir = root_dir + "/" + "Python_Code/Chapter_2/"

os.chdir(code_dir)

# %load drawcircle.py
import math
import turtle

# draw the circle using turtle
def drawCircleTurtle(x, y, r):
	# move to the start of the circle
	turtle.up()
	turtle.setpos(x + r, y)
	turtle.down()

	# draw the circle
	for i in range(0, 365, 5):
		a = math.radians(i)
		turtle.setpos(x + r * math.cos(a), y + r * math.sin(a))

drawCircleTurtle(100, 100, 50)
turtle.mainloop()

A window opens up with the output. The output is saved to an image file.

from IPython.display import display
from PIL import Image
img_PIL = Image.open(r'Images/drawcircle.png')
display(img_PIL)