1 use plotters::prelude::*;
2
3 use image::{imageops::FilterType, ImageFormat};
4
5 use std::fs::File;
6 use std::io::BufReader;
7
8 const OUT_FILE_NAME: &'static str = "plotters-doc-data/blit-bitmap.png";
9
main() -> Result<(), Box<dyn std::error::Error>>10 fn main() -> Result<(), Box<dyn std::error::Error>> {
11 let root = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area();
12 root.fill(&WHITE)?;
13
14 let mut chart = ChartBuilder::on(&root)
15 .caption("Bitmap Example", ("sans-serif", 30))
16 .margin(5)
17 .set_label_area_size(LabelAreaPosition::Left, 40)
18 .set_label_area_size(LabelAreaPosition::Bottom, 40)
19 .build_cartesian_2d(0.0..1.0, 0.0..1.0)?;
20
21 chart.configure_mesh().disable_mesh().draw()?;
22
23 let (w, h) = chart.plotting_area().dim_in_pixel();
24 let image = image::load(
25 BufReader::new(
26 File::open("plotters-doc-data/cat.png").map_err(|e| {
27 eprintln!("Unable to open file plotters-doc-data.png, please make sure you have clone this repo with --recursive");
28 e
29 })?),
30 ImageFormat::Png,
31 )?
32 .resize_exact(w - w / 10, h - h / 10, FilterType::Nearest);
33
34 let elem: BitMapElement<_> = ((0.05, 0.95), image).into();
35
36 chart.draw_series(std::iter::once(elem))?;
37 // To avoid the IO failure being ignored silently, we manually call the present function
38 root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
39 println!("Result has been saved to {}", OUT_FILE_NAME);
40 Ok(())
41 }
42 #[test]
entry_point()43 fn entry_point() {
44 main().unwrap()
45 }
46
