Peano curve: Difference between revisions
Added Rust solution
(Added Rust solution) |
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end
</lang>
=={{header|Rust}}==
<lang rust>// [dependencies]
// svg = "0.8.0"
use svg::node::element::path::Data;
use svg::node::element::Path;
struct PeanoCurve {
current_x: f64,
current_y: f64,
current_angle: i32,
line_length: f64,
}
impl PeanoCurve {
fn new(x: f64, y: f64, length: f64, angle: i32) -> PeanoCurve {
PeanoCurve {
current_x: x,
current_y: y,
current_angle: angle,
line_length: length,
}
}
fn rewrite(order: usize) -> String {
let mut str = String::from("L");
for _ in 0..order {
let mut tmp = String::new();
for ch in str.chars() {
match ch {
'L' => tmp.push_str("LFRFL-F-RFLFR+F+LFRFL"),
'R' => tmp.push_str("RFLFR+F+LFRFL-F-RFLFR"),
_ => tmp.push(ch),
}
}
str = tmp;
}
str
}
fn execute(&mut self, order: usize) -> Path {
let mut data = Data::new().move_to((self.current_x, self.current_y));
for ch in PeanoCurve::rewrite(order).chars() {
match ch {
'F' => data = self.draw_line(data),
'+' => self.turn(90),
'-' => self.turn(-90),
_ => {}
}
}
Path::new()
.set("fill", "none")
.set("stroke", "black")
.set("stroke-width", "1")
.set("d", data)
}
fn draw_line(&mut self, data: Data) -> Data {
let theta = (self.current_angle as f64).to_radians();
self.current_x += self.line_length * theta.cos();
self.current_y += self.line_length * theta.sin();
data.line_to((self.current_x, self.current_y))
}
fn turn(&mut self, angle: i32) {
self.current_angle = (self.current_angle + angle) % 360;
}
fn save(file: &str, size: usize, order: usize) -> std::io::Result<()> {
use svg::node::element::Rectangle;
let rect = Rectangle::new()
.set("width", "100%")
.set("height", "100%")
.set("fill", "white");
let mut p = PeanoCurve::new(8.0, 8.0, 8.0, 90);
let document = svg::Document::new()
.set("width", size)
.set("height", size)
.add(rect)
.add(p.execute(order));
svg::save(file, &document)
}
}
fn main() {
PeanoCurve::save("peano_curve.svg", 656, 4).unwrap();
}</lang>
{{out}}
See: [https://slack-files.com/T0CNUL56D-F01749MF7TM-70dda622c5 peano_curve.svg] (offsite SVG image)
=={{header|Sidef}}==
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