1 use plotters::prelude::*;
2
3 const OUT_FILE_NAME: &str = "plotters-doc-data/colormaps.png";
4
main() -> Result<(), Box<dyn std::error::Error>>5 fn main() -> Result<(), Box<dyn std::error::Error>> {
6 let colormaps_rgb: [(Box<dyn ColorMap<RGBColor>>, &str); 4] = [
7 (Box::new(ViridisRGB {}), "Viridis"),
8 (Box::new(BlackWhite {}), "BlackWhite"),
9 (Box::new(Bone {}), "Bone"),
10 (Box::new(Copper {}), "Copper"),
11 ];
12
13 let colormaps_hsl: [(Box<dyn ColorMap<HSLColor>>, &str); 2] = [
14 (Box::new(MandelbrotHSL {}), "MandelbrotHSL"),
15 (Box::new(VulcanoHSL {}), "VulcanoHSL"),
16 ];
17
18 let size_x: i32 = 800;
19 let n_colormaps = colormaps_rgb.len() + colormaps_hsl.len();
20 let size_y = 200 + n_colormaps as u32 * 100;
21 let root = BitMapBackend::new(OUT_FILE_NAME, (size_x as u32, size_y)).into_drawing_area();
22
23 root.fill(&WHITE)?;
24
25 let mut chart = ChartBuilder::on(&root)
26 .caption("Demonstration of predefined colormaps", ("sans-serif", 20))
27 .build_cartesian_2d(
28 -150.0..size_x as f32 + 50.0,
29 0.0..3.0 * (n_colormaps as f32),
30 )?;
31
32 use plotters::style::text_anchor::*;
33 let centered = Pos::new(HPos::Center, VPos::Center);
34 let label_style = TextStyle::from(("monospace", 14.0).into_font()).pos(centered);
35
36 let mut colormap_counter = 0;
37 macro_rules! plot_colormaps(
38 ($colormap:expr) => {
39 for (colormap, colormap_name) in $colormap.iter() {
40 chart.draw_series(
41 (0..size_x as i32).map(|x| {
42 Rectangle::new([
43 (x as f32, 3.0*(n_colormaps - 1 - colormap_counter) as f32 + 0.5),
44 (x as f32+1.0, 3.0*(n_colormaps - 1 - colormap_counter) as f32 + 2.5)
45 ],
46 colormap.get_color_normalized(x as f32, 0.0, size_x as f32).filled())
47 })
48 )?;
49 chart.draw_series(
50 [Text::new(colormap_name.to_owned(), (-75.0, 3.0*(n_colormaps-1-colormap_counter) as f32 + 1.5), &label_style)]
51 )?;
52 colormap_counter+=1;
53 }
54 }
55 );
56
57 plot_colormaps!(colormaps_rgb);
58 plot_colormaps!(colormaps_hsl);
59
60 // To avoid the IO failure being ignored silently, we manually call the present function
61 root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
62 println!("Result has been saved to {}", OUT_FILE_NAME);
63
64 Ok(())
65 }
66 #[test]
entry_point()67 fn entry_point() {
68 main().unwrap()
69 }
70
