pybox2d

2D Game Physics for Python

https://github.com/pybox2d/pybox2d

How to get it

pybox2d is available on conda-forge with the package name pybox2d. To create a new conda environment with pybox2d, run the following:

$ conda create -n pybox2d -c conda-forge python=3.6 pybox2d
$ conda activate pybox2d

Recent builds should be available for Windows, Linux, and OS X, with Python 3.6, 3.7, and 3.8.

What is it?

pybox2d is a 2D physics library for your games and simple simulations. It's based on the Box2D library, written in C++. It supports several shape types (circle, polygon, thin line segments), and quite a few joint types (revolute, prismatic, wheel, etc.).

Getting Started

For building instructions, see INSTALL.md. Check out the testbed examples to see what pybox2d can do. Then take a look at the getting started manual located on the pybox2d wiki.

Bugs

Please submit any bugs that you find to the issue tracker.

Testbed examples

You can browse the testbed examples on GitHub here

1. Install a backend such as pygame or pyglet to use as a renderer.

   Backend	Install	Homepage
   pygame	pip install pygame	http://pygame.org
   pyqt4	conda install pyqt4	https://www.riverbankcomputing.com/
   pyglet	pip install pyglet (or use conda-forge)	http://pyglet.org
   opencv	pip install opencv	http://opencv.org

2. Run your first example with the pygame backend:

   # As a start, try the web example with the pygame backend:
   $ python -m Box2D.examples.web --backend=pygame

3. Take a look at the other examples, setting the backend as appropriate:

   $ python -m Box2D.examples.apply_force
   $ python -m Box2D.examples.body_types
   $ python -m Box2D.examples.box_cutter
   $ python -m Box2D.examples.breakable
   $ python -m Box2D.examples.bridge
   $ python -m Box2D.examples.bullet
   $ python -m Box2D.examples.cantilever
   $ python -m Box2D.examples.car
   $ python -m Box2D.examples.chain
   $ python -m Box2D.examples.character_collision
   $ python -m Box2D.examples.cloth
   $ python -m Box2D.examples.collision_filtering
   $ python -m Box2D.examples.collision_processing
   $ python -m Box2D.examples.confined
   $ python -m Box2D.examples.convex_hull
   $ python -m Box2D.examples.conveyor_belt
   $ python -m Box2D.examples.distance
   $ python -m Box2D.examples.edge_shapes
   $ python -m Box2D.examples.edge_test
   $ python -m Box2D.examples.gish_tribute
   $ python -m Box2D.examples.hello
   $ python -m Box2D.examples.liquid
   $ python -m Box2D.examples.mobile
   $ python -m Box2D.examples.motor_joint
   $ python -m Box2D.examples.one_sided_platform
   $ python -m Box2D.examples.pinball
   $ python -m Box2D.examples.pulley
   $ python -m Box2D.examples.pyramid
   $ python -m Box2D.examples.raycast
   $ python -m Box2D.examples.restitution
   $ python -m Box2D.examples.rope
   $ python -m Box2D.examples.settings
   $ python -m Box2D.examples.theo_jansen
   $ python -m Box2D.examples.tiles
   $ python -m Box2D.examples.time_of_impact
   $ python -m Box2D.examples.top_down_car
   $ python -m Box2D.examples.tumbler
   $ python -m Box2D.examples.vertical_stack
   $ python -m Box2D.examples.web

These framework examples are included in the distribution, but they are also written in a way such that you can copy the examples directly and modify them yourself.

For example, the following would be possible:

$ git clone https://github.com/pybox2d/pybox2d pybox2d
$ mkdir my_new_examples
$ cp -R pybox2d/library/Box2D/examples/* my_new_examples
$ cd my_new_examples
$ python web.py --backend=pygame

Simple examples

There are also some simple examples that are not weighed down by testbed architecture. You can browse them on GitHub here

These can also be run directly from your pybox2d installation:

$ python -m Box2D.examples.simple.simple_01
$ python -m Box2D.examples.simple.simple_02

A similar opencv-based example is here:

$ python -m Box2D.examples.simple_cv