Project: Santa's Journey

Step 1: Using images with turtle graphics

1. Click on this trinket project link and hit the remix button trinket.io/python/8a940515cd

2. Start your code as usual with import turtle.

3. Create a screen object screen = turtle.Screen() set its size equal to the WorldMap.png image screen.setup(600, 467) and then set that image as the background screen.bgpic("WorldMap.png").

4. Create a turtle called 'santa' santa = turtle.Turtle(), import the Santa.png image screen.addshape("Santa.png") and set the turtle shape to this image santa.shape("Santa.png").

5. Give santa turtle some starting instructions santa.penup(), santa.speed(0), santa.goto(0,220), santa.setheading(90).

6. Now create a turtle called 'presents' and give it similar starting code but adding the hideturtle() function so the image does not appear at first:

presents = turtle.Turtle()

presents.hideturtle()

screen.addshape("Presents.png")

presents.shape("Presents.png")

presents.penup()

presents.speed(0)

presents.setheading(90)

7. Create a turtle called 'merry' and give it the following starting code:

merry = turtle.Turtle()

merry.hideturtle()

screen.addshape("Merry.png")

merry.shape("Merry.png")

merry.setheading(90)

Step 2: Binding keys to functions

1. Create variables for the speed that santa turtle will move and turn move_speed = 10, turn_speed = 10.

2. Now define functions for Santa turtle's movement e.g:

def forward():

santa.forward(move_speed)

def left():

santa.left(turn_speed)

3. Binding these movement functions to keys on your keyboard will let you control santa turtle on the screen. Use the onkey() function with first parameter set to the function you want run when the key is pressed, and the second parameter the name of the key e.g. screen.onkey(forward, 'Up'). Finish with the screen.listen() command, which tells the computer to keep checking for key presses.

Step 3: While loop to check for presents delivered

1. Create a variable to count the number of presents that santa turtle delivers count = 0.

2. Define a function that lets santa turtle place a present on the map. When santa turtle places a present, the invisible presents turtle moves to santa turtle's location and 'stamps' itself on the map. Every time a present is place, count goes up by 1:

def place():

global count

presents.goto(santa.xcor(), santa.ycor())

presents.stamp()

count += 1

3. Now bind this place function to the spacebar key screen.onkey(place, 'space').

4. Finish your code with a while loop that will continually check how many presents have been placed. Once 10 presents have been placed, the merry turtle you created in step 1 will appear with a Christmas message!

while True:

if count == 10:

merry.showturtle()

5. Finally, share the link to your trinket with anyone you want to send a Christmas card to. In your email include the following instructions:

Click on the map and then use the arrow keys to help Santa travel around the world on Christmas Eve. Press the spacebar to deliver presents, at least 10. Merry Christmas!

Here is a link to the finished trinket trinket.io/python/1a09d6704c happy holidays!