活动

介绍

事件允许您并行运行函数。您无需按顺序调用函数，而是可以将多个函数注册到一个事件中，并一次性触发它们。每个注册的函数都在其自身的线程中运行，从而使您的机器人能够同时执行多个任务——例如在行驶过程中在屏幕上显示数值。

要创建和使用事件，请按以下步骤操作：

1. Create the event with Event.

2. Register a function to trigger when the Event is broadcast using event.

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.

创建活动

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

Usage:
Event()

范围	描述
	此构造函数没有参数。

def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

# *** Creating the move_event Event ***
move_event = Event()

# Register move_square to move_event
move_event(move_square)

# Call all functions registered to move_event
move_event.broadcast()

将函数注册到事件

当您将一个函数注册到某个事件时，当该事件被广播时，该函数将在单独的线程中执行。

Usage:
event(callback, args)

范围	描述
event	先前创建的事件对象的名称。
callback	预先定义好在事件广播时执行的函数。
args	可选。包含要传递给回调函数的参数的元组。有关更多信息，请参阅使用带参数的函数。

def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

# Creating the move_event Event
move_event = Event()

# *** Register move_square to move_event ***
move_event(move_square)

# Call all functions registered to move_event
move_event.broadcast()

直播活动

broadcast

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

Usage:
event.broadcast()

范围	描述
event	先前创建的事件对象的名称。

# 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)

move_event = Event()
move_event(move_square)
# Broadcasting the move_event Event
move_event.broadcast()
optical_sensor.set_light_power(100, PERCENT)

broadcast_and_wait

broadcast_and_wait starts an event but waits for all registered functions to finish before continuing with subsequent functions.

Usage:
event.broadcast_and_wait()

范围	描述
event	先前创建的事件对象的名称。

def move_square():
    for index in range(4):
        drivetrain.drive_for(FORWARD, 150)
        drivetrain.turn_for(RIGHT, 90)

# 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()
optical_sensor.set_light_power(100, PERCENT)