plotpy 1.21.0

Rust plotting library using Python (Matplotlib)
Documentation 
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use plotpy::{Curve, Legend, Plot, StrError};
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::path::Path;

const OUT_DIR: &str = "/tmp/plotpy/integ_tests";

#[test]
fn test_legend_1() -> Result<(), StrError> {
    // curve and options
    let mut curve1 = Curve::new();
    curve1.set_label("my-curve");

    // another curve
    let mut curve2 = Curve::new();
    curve2.set_label("another-curve");

    // draw curve
    let x = &[1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0];
    let y = &[1.0, 1.414, 1.732, 2.0, 2.236, 2.449, 2.645, 2.828, 3.0, 3.162];
    let y2 = &[1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 3.5, 3.5, 3.5, 3.5];
    curve1.draw(x, y);
    curve2.draw(x, y2);

    // legend and options
    let mut legend = Legend::new();
    legend
        .set_fontsize(10.0)
        .set_handle_len(3.2)
        .set_num_col(2)
        .set_outside(true)
        .set_show_frame(false)
        .set_x_coords(&[0.2, 1.05, 0.8, 0.1]);

    // draw legend
    legend.draw();

    // add curve and legend to plot
    let mut plot = Plot::new();
    plot.add(&curve1);
    plot.add(&curve2);
    plot.add(&legend); // must be after a (labelled) curve

    // save figure
    let path = Path::new(OUT_DIR).join("integ_legend_1.svg");
    plot.save(&path)?;

    // check number of lines
    let file = File::open(path).map_err(|_| "cannot open file")?;
    let buffered = BufReader::new(file);
    let lines_iter = buffered.lines();
    assert!(lines_iter.count() > 780);
    Ok(())
}

#[test]
fn test_legend_2() -> Result<(), StrError> {
    // curve and options
    let mut curve1 = Curve::new();
    curve1.set_marker_style("o").set_label("my-curve");

    // another curve
    let mut curve2 = Curve::new();
    curve2.set_marker_style("*").set_label("another-curve");

    // draw curve
    let x = &[1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0];
    let y = &[1.0, 1.414, 1.732, 2.0, 2.236, 2.449, 2.645, 2.828, 3.0, 3.162];
    let y2 = &[1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 3.5, 3.5, 3.5, 3.5];
    curve1.draw(x, y);
    curve2.draw(x, y2);

    // legend and options
    let mut legend = Legend::new();
    legend.set_extra("numpoints=3").set_location("lower right");

    // draw legend
    legend.draw();

    // add curve and legend to plot
    let mut plot = Plot::new();
    plot.add(&curve1);
    plot.add(&curve2);
    plot.add(&legend); // must be after a (labelled) curve

    // save figure
    let path = Path::new(OUT_DIR).join("integ_legend_2.svg");
    plot.save(&path)?;

    // check number of lines
    let file = File::open(path).map_err(|_| "cannot open file")?;
    let buffered = BufReader::new(file);
    let lines_iter = buffered.lines();
    assert!(lines_iter.count() > 780);
    Ok(())
}