Pygame

As explained in Build Your Own Robot: Using Python, CRICKIT, and Raspberry Pi

Pygame is a Python library for developing multimedia applications and games, including windowing, input, graphics, and event handling.

Pygame is a Python module for multimedia applications and games, with built-in joystick-event support that makes it a practical starting point for joystick-controlled robots. section 7.4 section 7.2

A minimal joystick-event application follows this sequence:

• Install the Pygame Python package in the project’s virtual environment. section 7.4.1
• Initialize Pygame, create a window, and construct a Clock object. section 7.4.1
• Poll pygame.event.get inside a continuous event loop and pass each event to application logic. section 7.4 section 7.4.1
• Handle pygame.QUIT by calling pygame.quit, then regulate polling with clock.tick at a configured frame rate. section 7.4.1

Printing events at 60 frames per second

import pygame FRAME_RATE = 60 WINDOW_SIZE = [100, 100] def main(): pygame.init() screen = pygame.display.set_mode(WINDOW_SIZE) clock = pygame.time.Clock() while True: for event in pygame.event.get(): print('event detected:', event) if event.type == pygame.QUIT: pygame.quit() return clock.tick(FRAME_RATE) main() Save the script as pygame_events.py and run it in a graphical environment, locally on the desktop or remotely through VNC. Extend the event handler to respond to joystick movement and button presses. section 7.4.1 section 7.4

Figure 7.4 Software stack: the Linux input subsystem will be used to read joystick events.

Use the software-stack diagram to place Pygame’s joystick-event handling alongside the Linux input subsystem, Bluetooth connection, and robot motor control. section 7.2

How Build Your Own Robot: Using Python, CRICKIT, and Raspberry Pi covers it

How deep it goes

Builds from installation through initialization, event polling, quit handling, and frame-rate control; direct Linux event parsing follows later.

Examples

Demonstrates pygame_events.py, a graphical 100-by-100 window that prints detected events at 60 frames per second.

What it assumes

Assumes Python and a graphical environment; teaches Pygame installation, initialization, window creation, and event polling.

What you can do after

Apply it via Python to build an event loop that detects joystick movement, button presses, and window exits.

How it connects

Connects joystick devices and event loops with the Linux input subsystem, Bluetooth, and robot motor control.

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Also explained in

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  Coding with AIPygame is a Python library that provides modules for developing games with graphics, input, sound, and related functionality.

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Related concepts

• Pythonuses · Python is a high-level, general-purpose, dynamically typed programming language known for readable syntax and automatic memory management.
• modulekind of · A module is a distinct, bounded software unit that groups related code or functionality and provides an organizational or interaction boundary within a larger system.
• joystickuses · Joystick is a Pygame API constructor or class interface for creating an object that represents and accesses a joystick controller device.
• joystick eventuses · A joystick event is a software-reported occurrence representing an input change from a joystick controller, such as a button press or stick movement.
• librarykind of · A software library is a reusable collection of code or components that other programs can incorporate or invoke to provide functionality.

This explainer was generated by Manning's knowledge graph from the text of Build Your Own Robot: Using Python, CRICKIT, and Raspberry Pi. The section links point to the parts of the book it draws on.