Shared Variables

Let’s create a random ocean current that moves all the fishes. We need some variables that are shared across different sprites. To do that, we put the variables inside pysc.game, which behaves like a Python dictionary.

Add these lines in either player.py or enemy.py. Same as in Scratch, if the event is not related to the sprite, it doesn’t matter where you put it. In this case, we are putting the event in player.py

# create the variables
pysc.game['current_x'] = 0
pysc.game['current_y'] = 0

def ocean_current_change():
    # slowly change the current variables every 0.5 second
    while True:
        pysc.game['current_x'] += pysc.random_number(-0.1, 0.1)
        pysc.game['current_y'] += pysc.random_number(-0.1, 0.1)
        yield 0.5

# option 1: create the event as usual (the event will be removed when the player is removed)
player.when_game_start().add_handler(ocean_current_change)

# option 2: the event will not be removed when the player is removed.
# pysc.game.when_game_start().add_handler(ocean_current_change)

Analogous Scratch Code

Now add this event to enemy.py

def ocean_current_movement(clone_sprite):
    while True:
        clone_sprite.x += pysc.game['current_x'] 
        clone_sprite.y += pysc.game['current_y'] 
        yield 1/60

enemy.when_started_as_clone().add_handler(ocean_current_movement)

Analogous Scratch Code

And add this event to player.py

def ocean_current_movement():
    while True:
        player.x += pysc.game['current_x'] 
        player.y += pysc.game['current_y'] 
        yield 1/60

player.when_game_start().add_handler(ocean_current_movement)

Analogous Scratch Code

What you would see