08. Functions III

Functions Lab | Part III

In this lab, we will deepen our understanding with a series of design challenges.

[0] Set up

This lab will use the previous lab directory.

๐Ÿ’ป In the Terminal, type the following command to open the lab folder.
cd ~/desktop/making_with_code/cs9/unit00_drawing/lab_functions
๐Ÿ’ป Run mwc update to get the latest code.
mwc update

๐Ÿ’ป Enter the Poetry Shell to start the lab. As a reminder, we will run this command at the start of each lab, but only when we are inside a lab folder.

poetry shell
๐Ÿ‘พ ๐Ÿ’ฌ Exiting the poetry shell
When you want to exit the shell, you can type exit or ^D
๐Ÿ’ป Open circle_patterns in atom:
atom circle_patterns.py
๐Ÿ‘€Take a look at the code inside
from turtle import *

def filled_circle(circle_size,circle_color):

[Helpful Turtle Functions]

Here are some helpful Turtle functions that may make this problem easier. You are not required to use all of these functions.

Function Example Use Explanation
setheading() setheading(0) Sets the orientation of the turtle to an angle. 0 is east; 90 is north; 180 is west; 270 is south
goto() goto(0,0) Moves the turtle to an absolute x,y position
home() home() Moves the turtle to the start position (0,0)
penup() penup() Lifts the turtle pen up so it doesn’t draw
pendown() pendown() Lifts the turtle pen down so it doesn’t draw
speed() speed(1) Changes the speed of the turtle. 0 is the fastest. 1 is the slowest.
forward() forward(100) Draws a straight line in the current direction
backward() backward(100) Draws a straight line in the opposite direction
right() right(90) Turns the turtle a certain number of degrees right
left() left(90) Turns the turtle a certain number of degrees left
bgcolor() bgcolor(‘blue’) Changes the background of the turtle screen
colormode() colormode(255) Changes the turtle color to accept rgb colors. e.g. color(255,15,23)

[1] Circle Patterns

This mini lab is designed to be a pick and choose adventure. The patterns below are in order of difficulty. It is up to you to choose patterns that are at an appropriate level of difficulty for you.

Each of the pattenrs rely on the filled_circle() function provided in the starter code.

[Alternating Pattern]

๐Ÿ’ป Code a function alternating_pattern(num_circles)

Example function call: alternating_pattern(5)

  • It takes num_circles as a parameter - this will change the amount of circles in the pattern
  • Hard code the 2 colors to alternate between
  • Hint: look at the conditionals lab

For an additional challenge:

  • add num_circle_size as a parameter - this will change the size of the circles in the pattern
    • Example function call: alternating_pattern(5,200)


๐Ÿ’ป Code a function bullseye_pattern(num_circles, starting_circle_size)

Example function call: bullseye_pattern(5, 200)

  • It takes num_circles and starting_circle_size as parameters - the number of circles and the size of the bullseye should adjust accordingly
  • Hard code the 2 colors to alternate between

For an additional challenge:

  • add color1 and color2 as parameters - this will change the colors of the pattern.
    • Example function call: bullseye_pattern(5, 200, 'coral', 'light blue')

[Size Pattern]

๐Ÿ’ป Code a function size_pattern(num_columns, num_rows, color)

Example function call: size_pattern(6,5,'coral')

  • It takes num_columns, num_rows, and color as parameters

[Half-tone Pattern]

๐Ÿ’ป Code a function halftone_pattern(num_columns, num_rows, color1, color2)

Example function call: halftone_pattern(6,5,'dark blue','light blue')

  • It takes num_columns, num_rows, color1, and color2 as parameters

[Random Pattern]

๐Ÿ’ป First, code a function thick_circle(circle_size, circle_color, thickness)

  • It should draw a circle of any color, size, and any pen thickness

๐Ÿ’ป Second, code a function random_pattern(num_circles, background_color)

Example function call: random_pattern(20,'black')

  • It should create a random pattern of thick circles and filled circles
  • The circles should all be of random colors and sizes.

This will require you to:

  • use the randint() function from the random library
    • add from random import randint to the top of your file
  • change the color mode to accept rgb colors
    • add colormode(255) to the start of the function

[4] Deliverables

At then end of class, be sure to fill out this Google form.