thin_arrows/
thin-arrows.rs

1use std::f64::consts::TAU;
2use std::path::Path;
3
4use plotters::prelude::*;
5use plotters_arrows::ThinArrow;
6
7fn main() -> Result<(), DrawingAreaErrorKind<<BitMapBackend<'static> as DrawingBackend>::ErrorType>>
8{
9    let target = Path::new("example.png");
10    let graph_root = BitMapBackend::new(target, (256, 256)).into_drawing_area();
11    graph_root.fill(&WHITE)?;
12    let mut chart = ChartBuilder::on(&graph_root)
13        .margin(8)
14        .x_label_area_size(24)
15        .y_label_area_size(24)
16        .build_cartesian_2d(0f64..1f64, 0f64..1f64)?;
17
18    chart.configure_mesh().draw()?;
19
20    let x_count = 16;
21    let y_count = 16;
22    let arrow_size = 0.05;
23    chart.draw_series(
24        (0..=x_count)
25            .flat_map(|xi| (0..=y_count).map(move |yi| (xi, yi)))
26            .map(|(xi, yi)| {
27                let x = xi as f64 / x_count as f64;
28                let y = yi as f64 / y_count as f64;
29                let dx = arrow_size * f64::cos(y * TAU);
30                let dy = arrow_size * f64::cos(x * TAU);
31                ThinArrow::new((x, y), (x + dx, y + dy), &RED)
32            }),
33    )?;
34
35    graph_root.present()?;
36
37    Ok(())
38}
thin_arrows/thin-arrows.rs

thin_arrows/
thin-arrows.rs
