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pakt01

See /software/p5js/pakt-februari/pakt01/ for a JavaScript version and /software/supercollider/februari-pakt/pakt01/ for accompanying sound code.

use nannou::prelude::*;

const N: u16 = 75;

fn main() {
    nannou::sketch(view).size(640, 480).run();
}

fn view(app: &App, frame: Frame) {
    let draw = app.draw();
    let win = app.window_rect();
    frame.clear(BLACK);

    let index = app.time * 60.0;
    let yellow = (index * 0.0005).sin() * 0.3 + 0.65;

    let rad = win.h();
    for angle in 0..360 {
        let angle = angle as f32;
        let mut points = Vec::with_capacity(3);
        points.push((pt2(0.0, 0.0), rgb(1.0, 1.0, yellow)));

        let vx = angle.to_radians().cos();
        let vy = angle.to_radians().sin();
        points.push((pt2(vx, vy) * rad, rgb(0.0, 0.0, 0.0)));

        let next_vx = (angle + 1.0).to_radians().cos();
        let next_vy = (angle + 1.0).to_radians().sin();
        points.push((pt2(next_vx, next_vy) * rad, rgb(0.0, 0.0, 0.0)));

        draw.polygon().points_colored(points);
    }

    for i in 0..N {
        let i = i as f32;
        let xx = (i * 0.2).cos() * win.w() * 0.25;
        let yy = (i * 0.15).sin() * win.h() * 0.25;
        let start = (index * ((i + 1.0) * 0.00006)).cos() * 2.0 * PI;
        let end = (index * ((i * 1.0) * 0.00008)).sin() * 2.0 * PI;
        let size = (index * 0.01 + i).sin() * 50.0 + 58.0;
        let col = rgba(
            xx / win.w() + 0.5,
            yy / win.h() + 0.5,
            yellow,
            (end / 2.0 * PI).max(0.0).min(1.0),
        );
        let mut builder = geom::path::Builder::new();
        let ox = end.sin() * size;
        let oy = end.cos() * size;
        builder =
            builder
                .move_to(pt2(xx + ox, yy - oy))
                .arc(pt2(xx, yy), vec2(size, size), end, start);
        let path = builder.build();
        draw.scale_axes(vec3(1.0, -1.0, 1.0))
            .path()
            .stroke()
            .color(col)
            .weight(i / 8.0 + 4.0)
            .events(path.iter());
    }

    draw.to_frame(app, &frame).unwrap();
}