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Diffstat (limited to 'vendor/plotters/examples/sierpinski.rs')
-rw-r--r-- | vendor/plotters/examples/sierpinski.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/vendor/plotters/examples/sierpinski.rs b/vendor/plotters/examples/sierpinski.rs new file mode 100644 index 000000000..b9655bf94 --- /dev/null +++ b/vendor/plotters/examples/sierpinski.rs @@ -0,0 +1,43 @@ +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() +} |