Additional sensors

Checking the field boundaries

You can also use sensors to check if an actor is at the edges or outside the playing field:

Is the piece no longer on the field?###

This function checks if a figure is still in the current world.

@player3.register
def on_not_detecting_world(self):
    print("Warning: I'm not on the world!!!")

Example: A fish that swims back at the edges of the playing field

The following program simulates a fish that automatically turns around at the edges of the playing field:

from miniworlds import TiledWorld, Actor 

world = TiledWorld()
world.columns = 4
world.rows = 1
world.add_background("images/water.png")

fish = Actor((0,0))
fish.add_costume("images/fish.png")
fish.costume.orientation = -90
fish.direction = "right"

@fish.register
def act(self):
    self.move()

@fish.register
def on_not_detecting_world(self):
    self.move_back()
    self.flip_x()  # Der Fisch dreht um, wenn er den Spielfeldrand erreicht

world.run()

Ausgabe

Explanation

• The Methode on_not_detecting_world wird nur aufgerufen, wenn erkannt wird, dass sich der Fisch nicht mehr in der Welt befindet. Er wird mit move_back wieder zurückbewegt und anschließend gedreht.

Checking for field boundaries

You can also check if the boundaries of the playing field are reached or touched:

Is the piece at the edges of the playing field?**

@player4.register
def on_detecting_borders(self, borders):
    print("Borders are here!", str(borders))

Explanation:

• If a piece is at the edges of the playing field (e.g., at position (0,0)), it will output: Borders are here! ['right', 'top'].