1 use plotters::prelude::*;
2
3 const OUT_FILE_NAME: &'static str = "plotters-doc-data/matshow.png";
main() -> Result<(), Box<dyn std::error::Error>>4 fn main() -> Result<(), Box<dyn std::error::Error>> {
5 let root = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area();
6
7 root.fill(&WHITE)?;
8
9 let mut chart = ChartBuilder::on(&root)
10 .caption("Matshow Example", ("sans-serif", 80))
11 .margin(5)
12 .top_x_label_area_size(40)
13 .y_label_area_size(40)
14 .build_cartesian_2d(0i32..15i32, 15i32..0i32)?;
15
16 chart
17 .configure_mesh()
18 .x_labels(15)
19 .y_labels(15)
20 .max_light_lines(4)
21 .x_label_offset(35)
22 .y_label_offset(25)
23 .disable_x_mesh()
24 .disable_y_mesh()
25 .label_style(("sans-serif", 20))
26 .draw()?;
27
28 let mut matrix = [[0; 15]; 15];
29
30 for i in 0..15 {
31 matrix[i][i] = i + 4;
32 }
33
34 chart.draw_series(
35 matrix
36 .iter()
37 .zip(0..)
38 .map(|(l, y)| l.iter().zip(0..).map(move |(v, x)| (x as i32, y as i32, v)))
39 .flatten()
40 .map(|(x, y, v)| {
41 Rectangle::new(
42 [(x, y), (x + 1, y + 1)],
43 HSLColor(
44 240.0 / 360.0 - 240.0 / 360.0 * (*v as f64 / 20.0),
45 0.7,
46 0.1 + 0.4 * *v as f64 / 20.0,
47 )
48 .filled(),
49 )
50 }),
51 )?;
52
53 // To avoid the IO failure being ignored silently, we manually call the present function
54 root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
55 println!("Result has been saved to {}", OUT_FILE_NAME);
56
57 Ok(())
58 }
59 #[test]
entry_point()60 fn entry_point() {
61 main().unwrap()
62 }
63
