Pythagoras tree: Difference between revisions

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</syntaxhighlight>

=={{header|Rust}}==

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Creates a [https://static.miraheze.org/rosettacodewiki/1/18/Pythagoras_tree.svg '''svg file'''] (12 levels): <br>

[[File:Pythagoras tree.svg]]

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Creates a [https://static.miraheze.org/rosettacodewiki/1/18/Pythagoras_tree.svg '''~~Pythagoras_tree.~~svg file (12 levels)~~''']~~

'''[dependencies]'''<br>

svg = "0.~~10.0~~"

svg = "0.12"

<syntaxhighlight lang="rust">use svg::node::element::{Group, Polygon};

fn main() {

let mut ~~doc~~ = ~~svg::Document::new~~().~~set~~(~~"stroke"~~, ~~"white"~~);

let mut base: Vec<[(f64, f64); 2]> = vec![[(-200., 0.), (200., 0.)]];

let doc = (0..12_u8).fold(svg::Document::new().set("stroke", "white"), |doc_a, lvl| {

let mut base: Vec<[(f64, f64); 2]> = vec![[(-200.0, 0.0), (200.0, 0.0)]];

for lvl in 0..12u8 {

let rg = |step| lvl.wrapping_mul(step).wrapping_add(80 - step * 2);

let ~~mut group~~ = Group::new().set("fill", format!("#{:02X}{:02X}18", rg(20), rg(30))); // level color

let g = Group::new().set("fill", format!("#{:02X}{:02X}18", rg(20), rg(30))); // level color

doc_a.add(std::mem::take(&mut base).into_iter().fold(g, |ga, [a, b]| {

let mut next_base = Vec::new();

for [a, b] in base {

let v = (b.0 - a.0, b.1 - a.1);

let c = (a.0 + v.1, a.1 - v.0);

let [c, d, w] = [a, b, v].map(|p| (p.0 + v.1, p.1 - v.0));

let d = (c.0 + v.0, c.1 + v.1);

let e = (c.0 + w.0 / 2., c.1 + w.1 / 2.);

~~let e =~~ (c.0 + ~~0.5 * (v.0 + v.1)~~, ~~c.1 + 0.5 * (v.1 - v.0)~~);

base.extend([[c, e], [e, d]]);

~~group = group~~.add(Polygon::new().set("points", vec![a, c, e, d, c, d, b]));

ga.add(Polygon::new().set("points", vec![a, c, e, d, c, d, b]))

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}))

next_base.extend([[c, e], [e, d]]);

}

});

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let (x, y) = (base.iter()).fold((0., 0.), |(xa, ya), [p, _]| (p.0.min(xa), p.1.min(ya)));

base = next_base;

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svg::save("Pythagor_tree.svg", &doc.set("viewBox", (x, y, -x - x, -y))).unwrap();

doc = doc.add(group);

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}

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let (x0, y0) = (base.iter()).fold((0.0, 0.0), |(x0, y0), [~~(x, y)~~, _]| (x.min(x0), y.min(y0)));

let file = "Pythagoras_tree.svg";

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~~match~~ svg::save(~~file~~, &doc.set("viewBox", (x0, y0, -x0 * ~~2.0~~, -y0))) {

Ok(_) => println!("{file} file written successfully!"),

Err(e) => println!("failed to write {file}: {e}"),

}

}</syntaxhighlight>