Function test_plot_multiple_of_pi

tests/test_plot.rs:299–342

()

#[test]
fn test_plot_multiple_of_pi() -> Result<(), StrError> {
    // configure curve
    let mut cos_curve = Curve::new();
    let mut sin_curve = Curve::new();
    cos_curve.set_line_width(2.0);
    sin_curve.set_line_width(2.0).set_line_color("#cd0000");

    // add points
    const N: usize = 30;
    cos_curve.points_begin();
    sin_curve.points_begin();
    for i in 0..N {
        let u = (i as f64) * 2.0 * PI / ((N - 1) as f64);
        cos_curve.points_add(u, f64::cos(u));
        sin_curve.points_add(f64::sin(u), u);
    }
    cos_curve.points_end();
    sin_curve.points_end();

    // configure plot
    let mut plot = Plot::new();
    plot.set_gaps(0.3, 0.0).set_figure_size_points(600.0, 250.0);

    // add cos curve to plot
    plot.set_subplot(1, 2, 1);
    plot.add(&cos_curve).grid_and_labels("x", "y=cos(x)");
    plot.set_ticks_x_multiple_of_pi(0.0);

    // add sin curve to plot
    plot.set_subplot(1, 2, 2);
    plot.add(&sin_curve).grid_and_labels("x=sin(y)", "y");
    plot.set_ticks_y_multiple_of_pi(0.0);

    // save figure
    let path = Path::new(OUT_DIR).join("integ_plot_multiple_of_pi.svg");
    plot.set_show_errors(true).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() > 1060);
    Ok(())
}

#[test]
fn test_plot_extra_functionality() -> Result<(), StrError> {