Calling game over

We did all the hard work before when created is_body_collision() method, so now we just have to use it. First of all let's ensure that there is a game_over() when the snake head collides with its body.

if is_collision(game.snake):
    game_over(game)

Collision with fruit

Let's consider what should occur when the snake's head collides with a fruit. Naturally, when this happens, the fruit needs to appear in a different location, and the snake's length should increase. This concept is straightforward to understand and also implement:

if is_collision(game.snake, game.fruit.position):
    spawn(game.fruit, game.snake.positions)
    add_length(game.snake)

The code snippet above detects if the snake collides with a fruit. Upon collision, the fruit moves to a new position, the snake grows longer.