(2017) Programming Paradigm -- Lab 2 (Assignment) -- Functions, Selections, Repetitions, Recursions with Turtle Graphics. (A little bit overkill, I should say myself.)

PP-Lab2-Turtle.py

import random
import turtle

# Name: Window name
# Colour: Background Colour
# Width and Height: Width and Height of Window
def makeWindow(name="MY_WINDOW", colour="white", width=800, height=600):
    scr = turtle.Screen()
    scr.title(name)
    scr.bgcolor(colour)
    scr.setup(width, height)
    return scr

# Shape: Turtle's shape
# Colour: Turtle's colour (not Pen's)
# Size: Thickness of Pen
def makeTurtle(shape="turtle", colour="black", size=1):
    ttl = turtle.Turtle()
    ttl.shape(shape)
    ttl.color(colour)
    ttl.pensize(size)
    ttl.speed(0) # Doesn't seem to be working?
    return ttl

# Draw a star
def drawStar(ttl):
    for i in range(5):
        ttl.forward(350)
        ttl.right(144)

# Draw a coloured star
def drawStarColourful(ttl):
    for i in range(5):
        ttl.pencolor(prettyTurtle())
        ttl.forward(350)
        ttl.right(144)

# Draw a spiral
def drawSpiral(ttl):
    len = 1
    for i in range(200):
        # ttl.pencolor(prettyTurtle()) # Uncomment this line to use random colours
        ttl.forward(len)
        ttl.right(30)
        len += 1

# Draw a spiral (Dotted)
def drawSpiralDotted(ttl):
    len = 1
    for i in range(200):
        # ttl.pencolor(prettyTurtle()) # Uncomment this line to use random colours
        if (i % 2 != 0):
            ttl.penup()
            ttl.forward(len)
            ttl.right(30)
            len += 1
            ttl.pendown()
        else:
            ttl.forward(len)
            ttl.right(30)
            len += 1

# Draw a Snowflake
def drawSnowflake(ttl, length, level):
    if level > 0:
        for i in range(5):
            # ttl.pencolor(prettyTurtle()) # Uncomment this line to use random colours
            ttl.forward(length)
            drawSnowflake(ttl, length / 2.5, level - 1)
            ttl.backward(length)
            ttl.right(72)

# Pretty Turtles, AKA random colours
def prettyTurtle():
    colours = ["blue","black", "brown","red","yellow","green","orange","beige","turquoise","pink"]
    random.shuffle(colours)
    return colours[0]

# Main function
def main():
    scr = makeWindow()
    ttl = makeTurtle()

    scr.tracer(0, 0)  # Skips the drawing animation

    ttl.write("Please choose a pattern through the terminal. Thank you!\nYou can choose another pattern after a chosen pattern has been completed. :)", True, align="center")

    print("Choose a pattern:")
    print("1. Star")
    print("2. Star (Colourful)")
    print("3. Spiral")
    print("4. Spiral (dotted)")
    print("5. Snowflake")
    print("6. Exit")

    while True:

        try:
            choice = int(input("\nEnter your choice: "))

            if choice == 1:
                scr.title("Star")
                scr.reset()
                drawStar(ttl)
                scr.update()  # Update the screen once done
            elif choice == 2:
                scr.title("Star (Colourful)")
                scr.reset()
                drawStarColourful(ttl)
                scr.update()  # Update the screen once done
            elif choice == 3:
                scr.title("Spiral")
                scr.reset()
                drawSpiral(ttl)
                scr.update()  # Update the screen once done
            elif choice == 4:
                scr.title("Spiral (dotted)")
                scr.reset()
                drawSpiralDotted(ttl)
                scr.update()  # Update the screen once done
            elif choice == 5:
                scr.title("Snowflake")
                scr.reset()
                drawSnowflake(ttl, 100, 6)
                scr.update()        # Update the screen once done
            elif choice == 6:
                print("\nThank you for playing! :)")
                print("~ Yours Truly")
                break
            else:
                print("Invalid choice! Please try again.")

        except ValueError:
            print("Invalid choice! Please try again.")

# Start the program
main()