A python game engine.
PursuedPyBear, also known as
ppb, exists to be an educational resource. Most obviously used to teach computer science, it can be a useful tool for any topic that a simulation can be helpful.
At its core,
ppbprovides a number of features that make it perfect for video games. The
GameEngineitself provides a pluggable subsystem architecture where adding new features is as simple as subclassing and extending
System. Additionally, it contains a state stack of
Scenessimple containers that let you organize game scenes and UI screens in a simple way.
The entire system uses an event system which is as extensible as the rest of the system. Register new values to existing event types, and even overwrite the defaults. Adding a new event type to the system is as simple as firing an instance of your new event class with
signal. Instead of a publisher system, the engine knows everything in its own scope and only calls objects with appropriate callbacks. The most basic event is
Updateand your handlers should match the signature
on_update(self, update_event, signal).
ppbstarted to be a game framework great for learning with, the project has a few longterm goals:
Non-technical educators should feel comfortable after very little training. While some programming knowledge is required, the ability to think in objects and responses to events allows educators to only focus on their lessons.
A project built on
ppbshould look like idiomatic Python. It also should look like modern Python. As such, we often add new language features as soon as they're available, letting a new user always know ppb runs on the latest Python.
ppbgames are built out of instances of objects. Each object only has enough information to respond to the event provided, which always includes the current
ppbdoesn't have a master list of events, you can provide new ones simply to add more granular control over your game.
ppbstrongly tries to be extensible and pluggable, each hardware extension can provide its own hooks to
ppb, and you can nearly seamlessly switch between various Python libraries.
One of the maintainers put it best:
If it’s not fun to use, we should redo it
ppb is about filing off the rough edges so that the joy of creation and discovery are both emphasized. A new user should be able to build their first game in a few hours, and continue exploring beyond that.
Install ppb in the standard method:
pip install ppb
runfunction that makes it simple to start single screen games.
To make a very simple game, make a directory and add an image file called
ship.pngto it. Then add the following to a python file and run it.
import ppb from ppb.features.default_sprites import TargetSprite
class Ship(TargetSprite): target = ppb.Vector(0, 40)
def setup(scene): scene.add(Ship(position=(0, -7)))
Depending on your operating system, you may need to install additional packages (see installation guide).
ppbis guaranteed compatible with Python 3.6 or later.
The fastest way to get involved is to check out the ongoing discussions. If you're already using
ppbfeel free to report bugs, suggest enhancements, or ask for new features.
If you want to contribute code, definitely read the relevant portions of Contributing.MD