plotters/plotters/examples/blit-bitmap.rs at master · plotters-rs/plotters

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use plotters::prelude::*;

use image::{imageops::FilterType, ImageFormat};

use std::fs::File;

use std::io::BufReader;

const OUT_FILE_NAME: &str = "plotters-doc-data/blit-bitmap.png";

fn main() -> Result<(), Box<dyn std::error::Error>> {

let root = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area();

root.fill(&WHITE)?;

let mut chart = ChartBuilder::on(&root)

.caption("Bitmap Example", ("sans-serif", 30))

.margin(5)

.set_label_area_size(LabelAreaPosition::Left, 40)

.set_label_area_size(LabelAreaPosition::Bottom, 40)

.build_cartesian_2d(0.0..1.0, 0.0..1.0)?;

chart.configure_mesh().disable_mesh().draw()?;

let (w, h) = chart.plotting_area().dim_in_pixel();

let image = image::load(

BufReader::new(

File::open("plotters-doc-data/cat.png").map_err(|e| {

eprintln!("Unable to open file plotters-doc-data.png, please make sure you have clone this repo with --recursive");

})?),

ImageFormat::Png,

.resize_exact(w - w / 10, h - h / 10, FilterType::Nearest);

let elem: BitMapElement<_> = ((0.05, 0.95), image).into();

chart.draw_series(std::iter::once(elem))?;

// To avoid the IO failure being ignored silently, we manually call the present function

root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");

println!("Result has been saved to {}", OUT_FILE_NAME);

Ok(())

}

#[test]

fn entry_point() {

main().unwrap()

}

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