plotpy 0.2.2

Rust plotting library using Python (Matplotlib)
Documentation 
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use plotpy::{Contour, Plot};
use russell_lab::generate3d;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::path::Path;

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

#[test]
fn test_contour() -> Result<(), &'static str> {
    // contour object and options
    let mut contour = Contour::new();
    contour
        .set_colors(&vec!["#fcaeae", "#da98d1", "#c45178", "#5594d2", "#e6af69", "#e6d969"])
        .set_levels(&vec![0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0])
        .set_colorbar_label("temperature")
        .set_line_color("yellow")
        .set_line_style(":")
        .set_line_width(2.5)
        .set_selected_line_color("#69e699")
        .set_selected_line_width(5.0)
        .set_selected_level(1.0, true);

    // draw contour
    let n = 9;
    let (x, y, z) = generate3d(-2.0, 2.0, -2.0, 2.0, n, n, |x, y| x * x + y * y);
    contour.draw(&x, &y, &z);

    // add contour to plot
    let mut plot = Plot::new();
    plot.add(&contour);

    // save figure
    let path = Path::new(OUT_DIR).join("integ_contour.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() > 1500);
    Ok(())
}

#[test]
fn test_contour_colors() -> Result<(), &'static str> {
    // contour object and options
    let mut contour = Contour::new();
    contour
        .set_colors(&vec!["red", "green", "blue"])
        .set_levels(&vec![1.0, 3.0, 5.0, 7.0])
        .set_no_lines(true)
        .set_no_labels(true)
        .set_no_inline_labels(true)
        .set_no_colorbar(true);

    // draw contour
    let n = 9;
    let (x, y, z) = generate3d(-2.0, 2.0, -2.0, 2.0, n, n, |x, y| x * x + y * y);
    contour.draw(&x, &y, &z);

    // add contour to plot
    let mut plot = Plot::new();
    plot.add(&contour);

    // save figure
    let path = Path::new(OUT_DIR).join("integ_contour_colors.svg");
    match plot.save(&path) {
        Err(_) => plot.print_log_file(&path)?,
        Ok(_) => (),
    }

    // 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() > 580);
    Ok(())
}

#[test]
fn test_contour_colormap_index() -> Result<(), &'static str> {
    for index in 0..10 {
        // contour object and options
        let mut contour = Contour::new();
        contour
            .set_colormap_index(index)
            .set_no_lines(true)
            .set_no_labels(true)
            .set_no_inline_labels(true)
            .set_no_colorbar(true);

        // draw contour
        let n = 9;
        let (x, y, z) = generate3d(-2.0, 2.0, -2.0, 2.0, n, n, |x, y| x * x + y * y);
        contour.draw(&x, &y, &z);

        // add contour to plot
        let mut plot = Plot::new();
        plot.add(&contour);

        // save figure
        let filename = format!("integ_contour_colormap_{}.svg", index);
        let path = Path::new(OUT_DIR).join(&filename);
        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() > 770);
    }
    Ok(())
}

#[test]
fn test_contour_colormap_name() -> Result<(), &'static str> {
    for name in ["Pastel1", "tab20c", "gnuplot2"] {
        // contour object and options
        let mut contour = Contour::new();
        contour
            .set_colormap_name(name)
            .set_no_lines(true)
            .set_no_labels(true)
            .set_no_inline_labels(true)
            .set_no_colorbar(true);

        // draw contour
        let n = 9;
        let (x, y, z) = generate3d(-2.0, 2.0, -2.0, 2.0, n, n, |x, y| x * x + y * y);
        contour.draw(&x, &y, &z);

        // add contour to plot
        let mut plot = Plot::new();
        plot.add(&contour);

        // save figure
        let filename = format!("integ_contour_colormap_{}.svg", name);
        let path = Path::new(OUT_DIR).join(&filename);
        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() > 770);
    }
    Ok(())
}