Additional Sensors

Additional Sensors#

Checking World Boundaries#

You can also use sensors to check whether an actor is at the edges or outside the boundaries of the world.

Is the Actor Outside the World?#

This function checks whether an actor is no longer within the current world:

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

Example: A Fish That Turns Around at the World Borders#

The following program simulates a fish that automatically turns around when it reaches the edges of the world:

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()  # The fish turns around when it reaches the edge

world.run()

Output#

Explanation#

  • The method on_not_detecting_world is called only when the fish is detected as being outside the world.

  • It moves the fish back using move_back() and then flips its direction with flip_x().

Detecting World Borders#

You can also check whether an actor has reached or touched the boundaries of the world:

Is the Actor Touching the Borders?#

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

Explanation:

  • When the actor touches one or more edges of the world (e.g., at position (0, 0)), the output might be: Borders are here! ['right', 'top'].

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