Collisions become a function

You have collision checking working, but as we add more cabbages, it makes the code easier if you convert your existing collision code to a function.

Step 1.

To create this function, we will use the isCollision to return a True or False value. To do that, type the following at the end of the #Define functions section:

def isCollision(t1, t2):
       d = math.sqrt(math.pow(t1.xcor()-t2.xcor(),2) + math.pow(t1.ycor()-t2.ycor(),2))
       if d < 20:
           return True
       else:
           return False

Your function uses t1 and t2 as generic terms instead of turtle and food. It uses the same collision formula as before, featuring an if statement that returns a True value if they are in the same location (collide) and a False value when they don’t.

Step 2.

Now you need to update the code within the while True loop # Collision checking section to look like:

# Collision checking
if isCollision(player, food):
    food.setposition(random.randint(-290, 290), random.randint(-290, 290))

Step 3.

Save your game as kbgame5 and run your module.

Your code should now look like this:

#Turtle Graphics Game
import turtle
import math
import random

#Set up screen
turtle.setup(650,650)
wn = turtle.Screen()
wn.bgcolor("Navy")

#Draw border
mypen = turtle.Turtle()
mypen.color("white")
mypen.penup()
mypen.setposition(-300,-300)
mypen.pendown()
mypen.pensize(3)
for side in range(4):
    mypen.forward(600)
    mypen.left(90)
mypen.hideturtle()

#Create player turtle
player = turtle.Turtle()
player.color("darkorange")
player.shape("turtle")
player.penup()
player.speed(0)

#Create food
food = turtle.Turtle()
food.color("lightgreen")
food.shape("circle")
food.penup()
food.speed(0)
food.setposition(random.randint(-290, 290), random.randint(-290, 290))

#Set speed variable
speed = 1

#Define functions

def turn_left():
    player.left(30)

def turn_right():
    player.right(30)

def increase_speed():
    global speed
    speed += 1

def isCollision(t1, t2):
       d = math.sqrt(math.pow(t1.xcor()-t2.xcor(),2) + math.pow(t1.ycor()-t2.ycor(),2))
       if d < 20:
           return True
       else:
           return False

#Set keyboard bindings
turtle.listen()
turtle.onkey(turn_left, "Left")
turtle.onkey(turn_right, "Right")
turtle.onkey(increase_speed, "Up")


while True:
    player.forward(speed)

    #Boundary Checking x coordinate
    if player.xcor() > 290 or player.xcor() < -290:
        player.right(180)
    #Boundary Checking y coordinate
    if player.ycor() > 290 or player.ycor() < -290:
        player.right(180)

    #Collision checking

    if isCollision(player, food):
        food.setposition(random.randint(-290, 290), random.randint(-290, 290))

Time to celebrate

Congratulations Module 5 Completed