1 use plotters::prelude::*;
2
3 const OUT_FILE_NAME: &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, 0i32..15i32)?;
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 .flat_map(|(l, y)| l.iter().zip(0..).map(move |(v, x)| (x, y, v)))
39 .map(|(x, y, v)| {
40 Rectangle::new(
41 [(x, y), (x + 1, y + 1)],
42 HSLColor(
43 240.0 / 360.0 - 240.0 / 360.0 * (*v as f64 / 20.0),
44 0.7,
45 0.1 + 0.4 * *v as f64 / 20.0,
46 )
47 .filled(),
48 )
49 }),
50 )?;
51
52 // To avoid the IO failure being ignored silently, we manually call the present function
53 root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
54 println!("Result has been saved to {}", OUT_FILE_NAME);
55
56 Ok(())
57 }
58 #[test]
entry_point()59 fn entry_point() {
60 main().unwrap()
61 }
62
