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use std::thread;
use std::time::Duration;
extern crate rand;
use rand::seq::SliceRandom;
use rand::Rng;
extern crate sdl2;
use sdl2::event::Event;
use sdl2::gfx::primitives::DrawRenderer;
use sdl2::pixels::Color;
#[cfg(target_os = "emscripten")]
pub mod emscripten;
fn find_origin() -> (i16, i16) {
let mut rng = rand::thread_rng();
(rng.gen_range(100..400), rng.gen_range(100..400))
}
struct Line {
x1: i16,
y1: i16,
x2: i16,
y2: i16,
}
struct Pixel {
x: i16,
y: i16,
}
fn main() {
let context = sdl2::init().unwrap();
let video = context.video().unwrap();
let (height, width) = (500, 500);
let window = video.window("web", height, width).opengl().build().unwrap();
let mut canvas = window.into_canvas().build().unwrap();
let mut events = context.event_pump().unwrap();
canvas.set_draw_color(Color::RGB(0, 0, 0));
canvas.clear();
canvas.present();
let (x, y) = find_origin();
let mut lines = Vec::new();
for i in (0..(height as i16 + 1)).step_by(50) {
lines.push(Line {
x1: i,
y1: 0,
x2: x,
y2: y,
});
lines.push(Line {
x1: i,
y1: height as i16,
x2: x,
y2: y,
});
lines.push(Line {
x1: 0,
y1: i,
x2: x,
y2: y,
});
lines.push(Line {
x1: width as i16,
y1: i,
x2: x,
y2: y,
});
}
let mut rng = rand::thread_rng();
lines.shuffle(&mut rng);
let a = rng.gen_range(-7.0..7.0);
let b = rng.gen_range(-7.0..7.0);
let mut pixels = Vec::new();
for i in (1000..200000).step_by(10) {
let i = i as f64 * 0.001;
let x = (a + b * i) * i.cos() + x as f64;
let y = (a + b * i) * i.sin() + y as f64;
pixels.push(Pixel {
x: x as i16,
y: y as i16,
});
}
let mut main_loop = || {
let mut i = 0;
let mut run = true;
while run {
for event in events.poll_iter() {
if let Event::Quit { .. } = event {
run = false
};
}
if i < lines.len() {
let line = &lines[i];
canvas
.line(
line.x1,
line.y1,
line.x2,
line.y2,
Color::RGB(255, 255, 255),
)
.unwrap();
}
if i < pixels.len() {
let pixel = &pixels[i];
canvas
.pixel(pixel.x, pixel.y, Color::RGB(255, 255, 255))
.unwrap();
}
canvas.present();
thread::sleep(Duration::from_millis(10));
i += 1;
}
};
#[cfg(target_os = "emscripten")]
use emscripten::emscripten;
#[cfg(target_os = "emscripten")]
emscripten::set_main_loop_callback(main_loop);
#[cfg(not(target_os = "emscripten"))]
main_loop();
}
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