Topic 4

🏎️ Racing Turtles 🏁

racetrack()

1. Predict

2. Investigate

3. Modify

Which instructions need to be repeated to get the below image?

# How many times
# must I repeat?
for i in range(?):
  # instruction 1
  # instruction 2
  # ...
tina.hideturtle()

2. Modify

3. Challenge

hint: tina.color("blue")

def donow():
  tina = turtle.Turtle()
  tina.shape("arrow")
  tina.color("teal")
  tina.forward(50)
  tina.penup()
  tina.goto(0,50)
  tina.pendown()
  tina.forward(50)
  tina.penup()
  tina.goto(0,-50)
  tina.pendown()
  tina.forward(50)
  
donow()

def donow():
  tina = turtle.Turtle()
  tina.shape("arrow")
  tina.color("teal")
  tina.forward(50)
  tina.penup()
  tina.goto(0,50)
  tina.pendown()
  tina.forward(50)
  tina.penup()
  tina.goto(0,-50)
  tina.pendown()
  tina.forward(50)
  tina.color("red")
  tina.goto(50,50)
  tina.penup()
  tina.goto(0,50)
  tina.pendown()
  tina.goto(0,-50)

donow()

square()

for i in range(n):
makes a loop that repeats
indented instructions
exactly n times.

3. Challenge

1. Predict

2. Modify

3. Challenge

2. Modify

def square():
  tina = turtle.Turtle()
  tina.shape("square")
  tina.color("maroon")
  tina.penup()
  tina.goto(-50,-50)
  tina.pendown()
  for i in range(4):
    tina.forward(100)
    tina.left(90)
    
square()

def square():
  tina = turtle.Turtle()
  tina.shape("square")
  tina.color("maroon")
  tina.penup()
  tina.goto(-50,-50)
  tina.pendown()
  for i in range(4):
    tina.forward(100)
    tina.left(90)
  tina.penup()
  tina.goto(-100,-100)
  tina.color("purple")
  tina.pendown()
  for i in range(4):
    tina.forward(200)
    tina.left(90)

square()

triangle()

for i in range(n):
makes a loop that repeats
indented instructions
exactly n times.

3. Challenge

1. Predict

2. Modify

3. Challenge

2. Modify

def triangle():
  tina = turtle.Turtle()
  tina.shape("classic")
  # GREEN TRIANGLES
  tina.color("green")
  for i in range(3):
    tina.forward(25)
    tina.left(120)
  for i in range(3):
    tina.forward(50)
    tina.left(120)
  for i in range(3):
    tina.forward(75)
    tina.left(120)
  # RED TRIANGLE
  tina.color("red")
  for i in range(3):
    tina.forward(25)
    tina.right(120)
  for i in range(3):
    tina.forward(50)
    tina.right(120)
  for i in range(3):
    tina.forward(75)
    tina.right(120)
    
triangle()

spiral()

while True:
makes a loop that repeats
indented instructions
forever ♾️

Let's modify the code to make our first spiral like below.

Click for Square Spiral

Click for Triangle Spiral (part 1)

Click for Triangle Spiral (part 2)

spiral()

while True:
makes a loop that repeats
indented instructions
forever ♾️

Make your own spiral by changing the side and angle values, the colors and shape.

Hint: Change the speed to tina to 0 (the max)

tina.speed(0)

Challenge

How was I able to do a reverse spiral like in the gif below?