charton 0.5.0

A high-performance, layered charting system for Rust, featuring a flexible data core and multi-backend rendering.
Documentation 
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use charton::prelude::*;
use std::error::Error;

#[test]
fn test_histogram_1() -> Result<(), Box<dyn Error>> {
    let ds = load_dataset("iris")?;
    println!("{:?}", &ds);

    let raw_sl = ds.get_column::<f64>("sepal_length")?;
    let raw_sw = ds.get_column::<f64>("sepal_width")?;

    let mut value = Vec::with_capacity(raw_sl.len() + 50);
    value.extend_from_slice(raw_sl);
    value.extend_from_slice(&raw_sw[0..50]);

    let mut variable = Vec::with_capacity(raw_sl.len() + 50);

    variable.extend(std::iter::repeat_n(
        "sepal_length".to_string(),
        raw_sl.len(),
    ));

    variable.extend(std::iter::repeat_n("sepal_width".to_string(), 50));

    // Create a histogram chart
    let histogram = chart!(value, variable)?
        .mark_hist()?
        .configure_hist(|h| {
            h.with_color("steelblue")
                .with_opacity(0.5)
                .with_stroke("black")
                .with_stroke_width(0.0)
        })
        .encode((
            alt::x("value"),
            alt::y("count").with_normalize(true),
            alt::color("variable"),
        ))?;

    histogram
        .with_size(600, 400)
        .with_title("Histogram Example")
        .with_x_label("Value")
        .with_y_label("Frequency")
        .configure_theme(|t| t.with_palette(ColorPalette::Tab10))
        .coord_flip()
        .save("./tests/histogram_1.svg")?;

    Ok(())
}