⚠️ Beta State

PyBevy is in an early and experimental stage. The API is incomplete, subject to breaking changes without notice, and you should expect bugs. Many features are still under development.

CPU Draw

Modify image pixel data directly from the CPU each frame.

Introduction

Sometimes you need to generate or modify images procedurally from the CPU. This example creates an image, modifies its pixels, and displays it as a sprite.

from pybevy.prelude import *

Setup

Create a simple colored image and display it as a sprite. In a real application, you might update the pixel data each frame for procedural textures or visualizations.

def setup(commands: Commands, images: ResMut[Assets[Image]]) -> None:
    commands.spawn(Camera2d())
 
    # Create a simple 256x256 image
    image = Image.new(256, 256, Color.srgb(0.2, 0.4, 0.8))
    image_handle = images.add(image)
 
    commands.spawn(Sprite.from_image(image_handle))

Running the App

@entrypoint
def main(app: App) -> App:
    return app.add_plugins(DefaultPlugins).add_systems(Startup, setup)
 
if __name__ == "__main__":
    main().run()

Running this example

Use PyBevy's hot reload feature to run and develop this example. If you don't have PyBevy installed, check out the Quick Start guide.

$pybevy watch cpu_draw.py

The code will reload automatically when you make changes to the file.

From Python to Rust

Notice how the core concepts in the code—Commands, Assets, App, and Systems—are identical to the original Bevy example?

This is the power of pybevy! It lets you learn Bevy's powerful, data-driven architecture in friendly Python.

When your project grows and you're ready for maximum, native performance, you'll already know the concepts to start writing systems in Bevy Engine with Rust.

Bloom 2D

Mesh 2D