Buoyant

Buoyant is a library for writing and rendering SwiftUI-like views in Rust, primarily intended for use on no_std memory-constrained embedded systems.

Floating point math is aggressively avoided.

Nightly is required.

Available render targets

• DrawTarget: embedded-graphics displays.
• TextBuffer: A basic fixed-size char buffer. Does not respect graphemes. This is primarily useful for testing and debugging.
• CrossTerm: Renders colored character-pixels to a terminal using the crossterm crate.

A Quick Example

Here's what an Apple-like toggle button component would look like, implemented with Buoyant:

fn toggle_button(is_on: bool) -> impl Renderable<Rgb565, Renderables: EmbeddedGraphicsRender<Rgb565>> {
    let alignment = if is_on {
        HorizontalAlignment::Trailing
    } else {
        HorizontalAlignment::Leading
    };

    let color = if is_on { Rgb565::GREEN } else { Rgb565::RED };

    ZStack::new((
        Capsule.foreground_color(color),
        Circle.foreground_color(Rgb565::WHITE).padding(2),
    ))
    .with_horizontal_alignment(alignment)
    .frame()
    .with_width(50)
    .with_height(25)
    .animated(Animation::Linear(Duration::from_millis(200)), is_on)
}

Feature progress

Layout and Rendering

• Fixed-size Stacks with hetereogeneos children (VStack, HStack, ZStack)
• Stacks with homogeneous children (ForEach) - partial, vertical only
• Common SwiftUI primitives (Spacer, Divider)
• Conditional views - partial, no unwrapping
• Text, basic line breaking
• Text, Unicode line breaking
• Text, monospaced fonts
• Text, arbitrary fonts
• Animation
• Transition
• Common embedded-graphics shape primitives
• Canvas for arbitrary path/shape/raster drawing
• Shape stroke/fill
• Shape styles (gradients, fragment shaders)
• Images
• Alpha rendering
• Adaptive antialiasing

Interactivity

• State management
• Click/tap routing
• Focus management + keyboard input (Text input view)

Who should use this?

This project should not be used in production...yet. For hobby projects it's lightyears better than dealing with raw embedded-graphics. If you're familiar with SwiftUI, you should feel especially at home.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.