The XBoxController class is a Python class that provides an interface to interact with an Xbox controller. It uses the pygame library to handle the controller inputs.
sticks_threshold(float): The threshold for the stick values to trigger the callback.DEBUG(bool): A flag to enable debug mode.
__init__: Initializes the pygame library and the controller object.connect: Connects to the first controller, in case it was disconnected since initialization.setCallback(key, callback): Sets the callback for a specific button. Possible keys are: "x", "y", "a", "b", "left_trigger", "right_trigger", "left_bumper", "right_bumper", "back", "start", "left_stick", "right_stick", "left_stick_button", "right_stick_button", "hat".setCallbacks(callbacks): Sets the callbacks for the event listener.setHz(hz): Sets the frequency of the event listener.setDebugCallbacks(): Sets the debug callbacks to print the events to the console.runListener(): Starts a loop that listens for events. (NOTE: This method should be executed in a separated thread)
Callbacks are functions that are called when a specific event occurs. In the context of the XBoxController class, these events are button presses, stick movements, trigger pulls, and hat movements.
Here are examples of how to define callbacks for each type of event:
- Button callbacks: The callback function must accept a single parameter, which is the state of the button (0 for pressed, 1 for released).
def myCallback(x):
print("Button pressed" if x == 0 else "Button released")- Stick callbacks: The callback function must accept two parameters, the first one is the axis (0 for x, 1 for y) and the second one is the value of the stick [-1.0, 1.0].
def myCallback(axis, value):
print(f"Stick [{'y' if axis else 'x'}]: {value:.2f}")- Trigger callbacks: The callback function must accept a single parameter, which is the value of the trigger [-1.0, 1.0].
def myCallback(value):
print(f"Trigger: {value:.2f}")- Hat callback: The callback function must accept a single parameter, which is the value of the hat (tuple of two integers [[-1, 1], [-1, 1]]).
def myCallback(value):
print(f"Hat: {value}")# Create an instance of the XBoxController class
controller = XBoxController()
# Define a callback for the "a" button
def a_button_callback(state):
print("A button pressed" if state == 0 else "A button released")
# Set the callback for the "a" button
controller.setCallback("a", a_button_callback)
# Start the event listener
controller.runListener()This will print "A button pressed" when the "a" button is pressed and "A button released" when it is released.
Advanced example
We this code we can create a callback for the sticks, also set the speed of the event listener to 60hz and the threshold for the sticks to 0.2
# Create an instance of the XBoxController class
controller = XBoxController()
# Define a callback for the "a" button
def a_button_callback(state):
print("A button pressed" if state == 0 else "A button released")
# Define a callback for the sticks
def l_stick_callback(axis, value):
print(f"Left Stick [{'y' if axis else 'x'}]: {value:.2f}")
def r_stick_callback(axis, value):
print(f"Right Stick [{'y' if axis else 'x'}]: {value:.2f}")
# Define a callback for the triggers
def l_trigger_callback(value):
print(f"Left Trigger: {value:.2f}")
def r_trigger_callback(value):
print(f"Right Trigger: {value:.2f}")
# Define a callback for the hat
def hat_callback(value):
print(f"Hat: {value}")
# Set the callbacks
controller.setCallback("a", a_button_callback)
controller.setCallback("left_stick", l_stick_callback)
controller.setCallback("right_stick", r_stick_callback)
controller.setCallback("left_trigger", l_trigger_callback)
controller.setCallback("right_trigger", r_trigger_callback)
controller.setCallback("hat", hat_callback)
# Set the speed of the event listener to 60hz
controller.setHz(60)
# Set the threshold for the sticks to 0.2
controller.sticks_threshold = 0.3
controller.runListener()Multithreading example
This code will run the event listener in a separate thread, so the main thread can do other stuff while the event listener is running.
import threading
from xboxcontroller import XBoxController
# Define a callback for the "a" button
def a_button_callback(state):
print("A button pressed" if state == 0 else "A button released")
# Create an instance of the XBoxController class
controller = XBoxController()
# Set the callback for the "a" button
controller.setCallback("a", a_button_callback)
# Define a function to run the event listener in a separate thread
def run_listener():
controller.runListener()
# Start the event listener in a separate thread
listener_thread = threading.Thread(target=run_listener)
listener_thread.start()
# Do other stuff in the main thread while the event listener is running
while True:
print("Main thread is doing other stuff...")Multiprocessing example
This code will run the event listener in a separate process, so the main process can do other stuff while the event listener is running.
import multiprocessing
from xboxcontroller import XBoxController
# Define a callback for the "a" button
def a_button_callback(state):
print("A button pressed" if state == 0 else "A button released")
# Create an instance of the XBoxController class
controller = XBoxController()
# Set the callback for the "a" button
controller.setCallback("a", a_button_callback)
# Define a function to run the event listener in a separate process
def run_listener():
controller.runListener()
# Start the event listener in a separate process
listener_process = multiprocessing.Process(target=run_listener)
listener_process.start()
# Do other stuff in the main process while the event listener is running
while True:
print("Main process is doing other stuff...")
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