Pythagoras tree: Difference between revisions

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m (→‎{{header|Rust}}: inserted a img)
(→‎{{header|Rust}}: refactoring)
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</syntaxhighlight>
=={{header|Rust}}==
Creates a [https://static.miraheze.org/rosettacodewiki/1/18/Pythagoras_tree.svg '''Pythagoras_tree.svg file'''] (12 levels)''']: <br>▼
[[File:Pythagoras tree.svg]]
 
▲Creates a [https://static.miraheze.org/rosettacodewiki/1/18/Pythagoras_tree.svg '''Pythagoras_tree.svg file (12 levels)''']
 
'''[dependencies]'''<br>
svg = "0.10.012"
<syntaxhighlight lang="rust">use svg::node::element::{Group, Polygon};
 
fn main() {
let mut docbase: Vec<[(f64, f64); 2]> = svg::Document::newvec![[()-200.set, 0.), ("stroke"200., "white"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 groupg = 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, d, w] = ([a, b, v].map(|p| (p.0 + v.1, ap.1 - v.0));
let de = (c.0 + vw.0 / 2., c.1 + vw.1 / 2.);
let e = base.extend([[c.0, +e], 0.5 * (v.0 + v.1)[e, c.1 + 0.5 * (v.1 - v.0)d]]);
group = groupga.add(Polygon::new().set("points", vec![a, c, e, d, c, d, b]));
}))▼
next_base.extend([[c, e], [e, d]]);
});
let (x0x, y0y) = (base.iter()).fold((0.0, 0.0), |(x0xa, y0ya), [(x, y)p, _]| (xp.0.min(x0xa), yp.1.min(y0ya)));▼
base = next_base;
match svg::save(file"Pythagor_tree.svg", &doc.set("viewBox", (x0x, y0y, -x0x *- 2.0x, -y0y))) {.unwrap();▼
doc = doc.add(group);
▲ }
▲ 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";
▲ 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>
 
Retrieved from "https://rosettacode.org/wiki/Pythagoras_tree"