Barnsley fern: Difference between revisions

=={{header|Rust}}==

{{trans|Java}}

<lang rust>extern crate rand;

extern crate raster;

use rand::Rng;

fn main() {

let max_iterations = 200_000u32;

let height = 640i32;

let width = 640i32;

let mut rng = rand::thread_rng();

let mut image = raster::Image::blank(width, height);

raster::editor::fill(&mut image, raster::Color::white()).unwrap();

let mut x = 0.;

let mut y = 0.;

for _ in 0..max_iterations {

let r = rng.gen::<f32>();

let cx: f64;

let cy: f64;

if r <= 0.01 {

cx = 0f64;

cy = 0.16 * y as f64;

} else if r <= 0.08 {

cx = 0.2 * x as f64 - 0.26 * y as f64;

cy = 0.23 * x as f64 + 0.22 * y as f64 + 1.6;

} else if r <= 0.15 {

cx = -0.15 * x as f64 + 0.28 * y as f64;

cy = 0.26 * x as f64 + 0.26 * y as f64 + 0.44;

} else {

cx = 0.85 * x as f64 + 0.04 * y as f64;

cy = -0.04 * x as f64 + 0.85 * y as f64 + 1.6;

}

x = cx;

y = cy;

let _ = image.set_pixel(

((width as f64) / 2. + x * (width as f64) / 11.).round() as i32,

((height as f64) - y * (height as f64) / 11.).round() as i32,

raster::Color::rgb(50, 205, 50));

}

raster::save(&image, "fractal.png").unwrap();

}</lang>