Overview

Object-oriented programming is a style of programming that uses objects to organize the program. We’ll be dipping our metaphorical-toes into OOP in order to do something fun: drawing! Today, we’ll be exploring the graphics.py library, which is a simplified library for drawing graphical user interfaces in Python.

Basic Learning Objectives

Before the start of class, you should be able to:

  • Give examples of objects and classes in the context of graphics.py
  • Write a program to generate a basic shape in a GraphWin

Advanced Learning Objectives

During and after class, you should be able to:

  • Write a program to generate a more complex image with graphics.py
  • Use the coordinate system of graphics.py
  • Make an interactive graphics window

Readings

You should read the material linked through Moodle (or Zelle 4-4.4) and submit answers to the following on Moodle:

  • Draw the reference diagram after the following code: 
    dotOne = Circle(Point(10, 10), 4)
dotTwo = dotOne
dotTwo.move(1, 1)
  • What is the problem with the above code and how do you fix it?
  • Write a program that does the following. Note that you can test it out by downloading this file and putting it in the same folder as your code, but it’s fine if you don’t have a chance to test it.
    • Imports everything from graphics
    • Creates a graphics window
    • Draws a yellow circle somewhere in the window with radius 20