rust_minifb/examples/julia.rs

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extern crate minifb;
use minifb::{Key, Scale, ScaleMode, Window, WindowOptions};
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const WIDTH: usize = 100;
const HEIGHT: usize = 100;
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const FRACTAL_DEPTH: u32 = 64;
const GENERATION_INFINITY: f64 = 16.;
fn main() {
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let mut buffer: Vec<u32> = vec![0; WIDTH * HEIGHT];
let mut window = Window::new(
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"Fractal - ESC to exit",
WIDTH,
HEIGHT,
WindowOptions {
resize: true,
scale: Scale::X2,
scale_mode: ScaleMode::AspectRatioStretch,
..WindowOptions::default()
},
)
.expect("Unable to Open Window");
// Limit to max ~60 fps update rate
window.limit_update_rate(Some(std::time::Duration::from_micros(16600)));
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let range = 2.0;
let x_min = 0. - range;
let y_min = 0. - range;
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let x_max = 0. + range;
let y_max = 0. + range;
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let mut angle: f64 = 0.0;
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window.set_background_color(0, 0, 20);
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while window.is_open() && !window.is_key_down(Key::Escape) {
for i in 0..buffer.len() {
let mut real = map((i % WIDTH) as f64, 0., WIDTH as f64, x_min, x_max);
let mut imag = map((i / HEIGHT) as f64, 0., HEIGHT as f64, y_min, y_max);
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let mut n = 0;
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while n < FRACTAL_DEPTH {
let re = real.powf(2.) - imag.powf(2.);
let im = 2. * real * imag;
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real = re + angle.cos();
imag = im + angle.sin();
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if (real + imag).abs() > GENERATION_INFINITY {
break; // Leave when achieve infinity
}
n += 1;
}
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buffer[i] = fill(n);
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}
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angle += 0.1;
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// We unwrap here as we want this code to exit if it fails
window.update_with_buffer(&buffer, WIDTH, HEIGHT).unwrap();
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}
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}
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fn map(val: f64, start1: f64, stop1: f64, start2: f64, stop2: f64) -> f64 {
start2 + (stop2 - start2) * ((val - start1) / (stop1 - start1))
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}
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fn fill(n: u32) -> u32 {
if FRACTAL_DEPTH == n {
return 0x00;
} else {
return n * 32 % 255;
}
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}