100 Days of Code: The Complete Python Pro Bootcamp for 2022 - Day 21 (Snake Game Part 2)
Published: 2022-06-07 10:16:33

- Day 2 Process

Inheritance

Continuation of the snake game
1. Detect collision with food
2. Create scoreboard and keep score
3. Detect collision with wall
4. Detect collision with tail

- Inheritance
````python
class Animal:
    def __init__(self):
        self.num_eyes = 2

    def breathe(self):
        print("Inhale, Exhale. ")


class Fish(Animal):
    def __init__(self):
        super().__init__()

    def breathe(self):
        super(Fish, self).breathe()
        print("doing this under water")

    def swim(self):
        print("moving in water")


nemo = Fish()
nemo.swim()
nemo.breathe()
print(nemo.num_eyes)
```
- 1. Detect collision with food
Create food.py
````python
from turtle import Turtle
import random


class Food(Turtle):

    def __init__(self):
        super().__init__()
        self.shape("circle")
        self.penup()
        self.shapesize(stretch_len=0.5, stretch_wid=0.5)
        self.color("blue")
        self.speed("fastest")
        self.refresh()

    def refresh(self):
        random_x = random.randint(-280, 280)
        random_y = random.randint(-280, 280)
        self.goto(random_x, random_y)
```
Add to main.py
````python
from food import Food
food = Food()
if snake.head.distance(food) < 15:
    food.refresh()
```
Complete main.py
````python
from turtle import Screen
from snake import Snake
from food import Food
import time

# Screen setup
screen = Screen()
screen.setup(width=600, height=600)
screen.bgcolor("black")
screen.title("SnakeGame")
screen.tracer(0)

snake = Snake()
food = Food()

screen.listen()
screen.onkey(snake.up, "Up")
screen.onkey(snake.down, "Down")
screen.onkey(snake.left, "Left")
screen.onkey(snake.right, "Right")

game_is_on = True
while game_is_on:
    screen.update()
    time.sleep(0.1)
    snake.move()

    if snake.head.distance(food) < 15:
        food.refresh()

screen.exitonclick()
```
- 2. Create scoreboard and keep score

Create scoreboard.py
````python
from turtle import Turtle

ALIGNMENT = "center"
FONT = ("Courier", 20, "normal")


class Scoreboard(Turtle):

    def __init__(self):
        super().__init__()
        self.hideturtle()
        self.score = 0
        self.penup()
        self.setx(0)
        self.sety(260)
        self.pendown()
        self.color("white")
        self.update_scoreboard()

    def update_scoreboard(self):
        self.write(f"Score: {self.score}", align=ALIGNMENT, font=FONT)

    def increase_score(self):
        self.score += 1
        self.clear()
        self.update_scoreboard()
```
main.py ADD
from scoreboard import Scoreboard
score = Scoreboard()
under if statement add score.increase_score()
```python
from turtle import Screen
from snake import Snake
from food import Food
from scoreboard import Scoreboard
import time

# Screen setup
screen = Screen()
screen.setup(width=600, height=600)
screen.bgcolor("black")
screen.title("SnakeGame")
screen.tracer(0)

snake = Snake()
food = Food()
score = Scoreboard()


screen.listen()
screen.onkey(snake.up, "Up")
screen.onkey(snake.down, "Down")
screen.onkey(snake.left, "Left")
screen.onkey(snake.right, "Right")

game_is_on = True
while game_is_on:
    screen.update()
    time.sleep(0.1)
    snake.move()

    if snake.head.distance(food) < 15:
        food.refresh()
        score.increase_score()

screen.exitonclick()
```
- 3 + 4 Detect collision with wall and tail
snake.py
````python
class Snake:

    def __init__(self):
        self.all_snake = []
        self.create_snake()
        self.head = self.all_snake[0]

    def create_snake(self):
        for position in STARTING_POSITIONS:
            self.add_segment(position)

    def add_segment(self, position):
        new_snake = Turtle("square")
        new_snake.color("white")
        new_snake.penup()
        new_snake.goto(position)
        self.all_snake.append(new_snake)

    def extend(self):
        self.add_segment(self.all_snake[-1].position())
```
main.py
````python
# Detect collision with tail
    for segment in snake.all_snake:
        if segment == snake.head:
            pass
        elif snake.head.distance(segment) < 10:
            game_is_on = False
            score.game_over()
    
    # Detect collision with wall.
    if snake.head.xcor() > 280 or snake.head.xcor() < -280 or snake.head.ycor() > 280 or snake.head.ycor() < -280:
        game_is_on = False
        score.game_over()
```