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use poly::Poly;
use poly::Number;
use poly::Lerp;
use sdl2::pixels::Color;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
use sdl2::rect::Rect;
use std::thread;
use std::time::Duration;
fn eval_poly(p: &Poly, t: Number) -> Number {
let mut r = 0.0;
for i in 0..p.len() {
r += p[i] * t.powi(i as i32);
}
r
}
fn main() {
let a = Lerp::new(vec![100.0, 200.0, 300.0, 500.0]);
let b = Lerp::new(vec![400.0, 140.0, 500.0, 300.0]);
let pa = poly::lp(a);
let pb = poly::lp(b);
let sdl_context = sdl2::init().unwrap();
let video_subsystem = sdl_context.video().unwrap();
let window = video_subsystem.window("rust-sdl2 demo", 800, 600)
.position_centered()
.build()
.unwrap();
let mut canvas = window.into_canvas().build().unwrap();
let mut event_pump = sdl_context.event_pump().unwrap();
'running: loop {
canvas.set_draw_color(Color::RGB(20, 20, 20));
canvas.clear();
for event in event_pump.poll_iter() {
match event {
Event::Quit {..} |
Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
break 'running
},
_ => {}
}
}
for t in 0..800 {
let x = eval_poly(&pa, t as Number / 800.0);
let y = eval_poly(&pb, t as Number / 800.0);
canvas.set_draw_color(Color::RGB(180, 20, 20));
canvas.fill_rect(Rect::new(t, x as i32, 5, 5)).unwrap();
canvas.set_draw_color(Color::RGB(20, 180, 20));
canvas.fill_rect(Rect::new(t, y as i32, 5, 5)).unwrap();
}
canvas.present();
thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
}
}
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