Eventos

Introducción

Los eventos permiten ejecutar funciones en paralelo. En lugar de llamarlas secuencialmente, puedes registrar varias funciones en un evento y activarlas todas a la vez. Cada función registrada se ejecuta en su propio hilo, lo que permite que tu robot realice varias tareas simultáneamente, como mostrar valores en la pantalla mientras se desplaza.

Para crear y luego usar un evento, siga estos pasos en orden:

1. Create the event with Event.

2. Register a function to trigger when the Event is broadcast by calling the event object with the function as an argument.

3. Broadcast an Event:

   • broadcast – Triggers all registered functions in an event object to run concurrently.

   • broadcast_and_wait – Triggers all registered functions in an event object and waits for them to finish before continuing.

Crear un evento

Event creates an event object that manages function execution in separate threads.

Uso:
Event()

Parámetros	Descripción
	Este constructor no tiene parámetros.

# Build Used: Super Code Base 2.0
def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

def main():
    # Creating the move_event Event
    move_event = Event()
    move_event(move_square)
    move_event.broadcast()
    bumper.set_color(GREEN)

# Start threads — Do not delete
start_thread(main)

Registrar funciones en un evento

Cuando se registra una función en un evento, esta se ejecutará en un hilo independiente cuando se transmita dicho evento.

Usage:
event(callback, args)

Parámetros	Descripción
event	El nombre del objeto de evento creado previamente.
callback	Una función definida previamente que se ejecutará cuando se transmita el evento.
args	Optional. A tuple of arguments to pass to the callback function.

# Build Used: Super Code Base 2.0
def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

def main():
    move_event = Event()
    # Register the move_square function to the move_event Event
    move_event(move_square)
    move_event.broadcast()
    bumper.set_color(GREEN)

# Start threads — Do not delete
start_thread(main)

Transmitir un evento

broadcast

broadcast triggers an event, starting all registered functions in separate threads. This method does not pause execution of any subsequent code.

Uso:
event.broadcast()

Parámetros	Descripción
event	El nombre del objeto de evento creado previamente.

# Build Used: Super Code Base 2.0
def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

def main():
    move_event = Event()
    move_event(move_square)
    # Broadcasting the move_event Event
    move_event.broadcast()
    bumper.set_color(GREEN)

# Start threads — Do not delete
start_thread(main)

broadcast_and_wait

broadcast_and_wait inicia un evento pero espera a que finalicen todas las funciones registradas antes de continuar con las funciones subsiguientes.

Uso:
event.broadcast_and_wait()

Parámetros	Descripción
event	El nombre del objeto de evento creado previamente.

# Build Used: Super Code Base 2.0
def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

def main():
    # Set up and call the move_square event
    move_event = Event()
    move_event(move_square)
    # Broadcast the move_event Event and wait
    move_event.broadcast_and_wait()
    bumper.set_color(GREEN)

# Start threads — Do not delete
start_thread(main)