rustc/vendor/plotters/examples/chart.rs

use plotters::prelude::*;

const OUT_FILE_NAME: &'static str = "plotters-doc-data/sample.png";
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let root_area = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area();

    root_area.fill(&WHITE)?;

    let root_area = root_area.titled("Image Title", ("sans-serif", 60))?;

    let (upper, lower) = root_area.split_vertically(512);

    let x_axis = (-3.4f32..3.4).step(0.1);

    let mut cc = ChartBuilder::on(&upper)
        .margin(5)
        .set_all_label_area_size(50)
        .caption("Sine and Cosine", ("sans-serif", 40))
        .build_cartesian_2d(-3.4f32..3.4, -1.2f32..1.2f32)?;

    cc.configure_mesh()
        .x_labels(20)
        .y_labels(10)
        .disable_mesh()
        .x_label_formatter(&|v| format!("{:.1}", v))
        .y_label_formatter(&|v| format!("{:.1}", v))
        .draw()?;

    cc.draw_series(LineSeries::new(x_axis.values().map(|x| (x, x.sin())), &RED))?
        .label("Sine")
        .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], &RED));

    cc.draw_series(LineSeries::new(
        x_axis.values().map(|x| (x, x.cos())),
        &BLUE,
    ))?
    .label("Cosine")
    .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], &BLUE));

    cc.configure_series_labels().border_style(&BLACK).draw()?;

    /*
    // It's possible to use a existing pointing element
     cc.draw_series(PointSeries::<_, _, Circle<_>>::new(
        (-3.0f32..2.1f32).step(1.0).values().map(|x| (x, x.sin())),
        5,
        Into::<ShapeStyle>::into(&RGBColor(255,0,0)).filled(),
    ))?;*/

    // Otherwise you can use a function to construct your pointing element yourself
    cc.draw_series(PointSeries::of_element(
        (-3.0f32..2.1f32).step(1.0).values().map(|x| (x, x.sin())),
        5,
        ShapeStyle::from(&RED).filled(),
        &|coord, size, style| {
            EmptyElement::at(coord)
                + Circle::new((0, 0), size, style)
                + Text::new(format!("{:?}", coord), (0, 15), ("sans-serif", 15))
        },
    ))?;

    let drawing_areas = lower.split_evenly((1, 2));

    for (drawing_area, idx) in drawing_areas.iter().zip(1..) {
        let mut cc = ChartBuilder::on(&drawing_area)
            .x_label_area_size(30)
            .y_label_area_size(30)
            .margin_right(20)
            .caption(format!("y = x^{}", 1 + 2 * idx), ("sans-serif", 40))
            .build_cartesian_2d(-1f32..1f32, -1f32..1f32)?;
        cc.configure_mesh()
            .x_labels(5)
            .y_labels(3)
            .max_light_lines(4)
            .draw()?;

        cc.draw_series(LineSeries::new(
            (-1f32..1f32)
                .step(0.01)
                .values()
                .map(|x| (x, x.powf(idx as f32 * 2.0 + 1.0))),
            &BLUE,
        ))?;
    }

    // To avoid the IO failure being ignored silently, we manually call the present function
    root_area.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
    println!("Result has been saved to {}", OUT_FILE_NAME);
    Ok(())
}
#[test]
fn entry_point() {
    main().unwrap()
}