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use plotters::coord::Shift;
use plotters::prelude::*;
pub fn sierpinski_carpet(
depth: u32,
drawing_area: &DrawingArea<BitMapBackend, Shift>,
) -> Result<(), Box<dyn std::error::Error>> {
if depth > 0 {
let sub_areas = drawing_area.split_evenly((3, 3));
for (idx, sub_area) in (0..).zip(sub_areas.iter()) {
if idx != 4 {
sub_area.fill(&BLUE)?;
sierpinski_carpet(depth - 1, sub_area)?;
} else {
sub_area.fill(&WHITE)?;
}
}
}
Ok(())
}
const OUT_FILE_NAME: &'static str = "plotters-doc-data/sierpinski.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 root = root
.titled("Sierpinski Carpet Demo", ("sans-serif", 60))?
.shrink(((1024 - 700) / 2, 0), (700, 700));
sierpinski_carpet(5, &root)?;
// 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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