let values: Array2<f64> = Array::random((100, 2), StandardNormal);

let chart = VegaliteBuilder::default()
    .title("Random points")
    .data(values)
    .mark(Mark::Point)
    .encoding(
        EncodingBuilder::default()
            .x(XClassBuilder::default()
                .field("data.0")
                .def_type(StandardType::Quantitative)
                .build()?)
            .y(YClassBuilder::default()
                .field("data.1")
                .def_type(StandardType::Quantitative)
                .build()?)
            .build()?,
    )
    .build()?;
chart.show()?;

// Use existing vega-lite json specification
let spec = r##"{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.0.json",
    "encoding": {
        "x": {
            "field": "data.0",
            "type": "quantitative"
        },
        "y": {
            "field": "data.1",
            "type": "quantitative"
        }
    },
    "mark": "point",
    "title": "Random points"
}"##;

// Use you own data to populate the chart
let values: Array2<f64> = Array::random((100, 2), StandardNormal);
let mut chart: Vegalite = serde_json::from_str(spec)?;
chart.data = values.into();

// display the chart using `showata`
chart.show()?;