Cyma

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Composable views and associated data structures for nih-plug UIs made using VIZIA.

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✨ Overview

Cyma is a collection of flexible, composable views that you can use to make rich plug-in user interfaces with ease. It uses various custom data structures for real-time visualizers, allowing you to easily build beautiful, performant plug-in UIs.

Here's a demo (YouTube mirror)

2025-01-16.22-57-38.mp4

Wanna see the code behind this? It's this example!

🧰 What's included

Do you think something's missing? File a feature request so it can be added!

📊 Visualizers

General/Utility

• Grid backdrop
• Unit ruler

Peak/Waveform Analysis

• Meter
• Graph
• Oscilloscope
• Static waveform

Stereo imaging

• Lissajous

Spectral analysis

• Spectrum Analyzer

❓ Example

Here's how to create a basic oscilloscope.

Visualizers communicate with your plugin via busses. One bus can feed multiple visualizers. Just add it to your plugin like so:

pub struct OscopePlugin {
    params: Arc<OscopeParams>,
    bus: Arc<MonoBus>,
}

impl Plugin for OscopePlugin {
    fn initialize(
        &mut self,
        _: &AudioIOLayout,
        buffer_config: &BufferConfig,
        _: &mut impl InitContext<Self>,
    ) -> bool {
        self.bus.set_sample_rate(buffer_config.sample_rate);
        true
    }

    fn process(
        &mut self,
        buffer: &mut Buffer,
        _: &mut AuxiliaryBuffers,
        _: &mut impl ProcessContext<Self>,
    ) -> ProcessStatus {
        if self.params.editor_state.is_open() {
            self.bus.send_buffer_summing(buffer);
        }
        ProcessStatus::Normal
    }

    fn editor(&mut self, _async_executor: AsyncExecutor<Self>) -> Option<Box<dyn Editor>> {
        editor::create(
            self.bus.clone(),
            self.params.editor_state.clone(),
        )
    }
    
    ...
}

Now, in your editor code, you just need to subscribe to the bus. Then, you can use it for visualizers like this oscilloscope:

pub fn create(
    bus: Arc<MonoBus>,
    editor_state: Arc<ViziaState>,
) -> Option<Box<dyn Editor>> {
    create_vizia_editor(editor_state, ViziaTheming::default(), move |cx, _| {
        bus.subscribe(cx);
        Oscilloscope::new(cx, bus.clone(), 4.0, (-1.0, 1.0), ValueScaling::Linear)
            .color(Color::rgb(120, 120, 120));
    })
}

Check out the book or the examples to familiarize yourself with this system.

🍔 Composing views

A core feature of Cyma is composability.

For example, by combining views such as the Grid, UnitRuler, Graph, and Histogram you can make this real-time peak graph with an RMS plot and a histogram overlay.

ZStack::new(cx, |cx| {
    Grid::new(
        cx,
        ValueScaling::Linear,
        (-32., 8.0),
        vec![6.0, 0.0, -6.0, -12.0, -18.0, -24.0, -30.0],
        Orientation::Horizontal,
    )
    .border_width(Pixels(0.5))
    .color(Color::rgb(30, 30, 30));
    Graph::peak(
        cx,
        bus.clone(),
        10.0,
        50.0,
        (-32.0, 8.0),
        ValueScaling::Decibels,
    )
    .color(Color::rgba(255, 255, 255, 60))
    .background_color(Color::rgba(255, 255, 255, 30));
    Graph::rms(
        cx,
        bus.clone(),
        10.0,
        250.0,
        (-32.0, 8.0),
        ValueScaling::Decibels,
    )
    .color(Color::rgba(255, 92, 92, 128));
    Histogram::new(cx, bus.clone(), 250.0, (-32.0, 8.0), ValueScaling::Decibels)
        .width(Pixels(64.0))
        .color(Color::rgba(64, 128, 255, 64))
        .background_color(Color::rgba(64, 128, 255, 32));
    UnitRuler::new(
        cx,
        (-32.0, 8.0),
        ValueScaling::Linear,
        vec![
            (6.0, "6 dB"),
            (0.0, "0 dB"),
            (-6.0, "-6 dB"),
            (-12.0, "-12 dB"),
            (-18.0, "-18 dB"),
            (-24.0, "-24 dB"),
            (-30.0, "-30 dB"),
        ],
        Orientation::Vertical,
    )
    .font_size(12.)
    .color(Color::rgb(220, 220, 220))
    .right(Pixels(8.0))
    .left(Stretch(1.0));
});

🙋 Contributing

If you have questions about Cyma, need help with something, or want to show off what you built using it, head over to the Discussions tab.

If you want to contribute through issues and code contributions, read the Contributing Guidelines first

📃 License

This project is licensed under the MPL.