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pakt05

See /software/p5js/pakt-februari/pakt05/ for a JavaScript version and /software/supercollider/februari-pakt/pakt05/ for accompanying sound code.

use nannou::prelude::*;

const N: u16 = 100;

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 spread = (index * 0.0012).sin() * 20.0;
  let speed1 = (index * 0.0013).sin() * 0.001 + 0.005;
  let speed2 = (index * 0.0014).sin() * 0.001 + 0.0005;
  let speed3 = (index * 0.0015).sin() * 0.001 + 0.014;
  let speed4 = (index * 0.0016).sin() * 0.001 + 0.012;

  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(0.5, 0.4, 0.3)));

    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 p = pt2(
      (index * i * speed1).sin() + (index * i * speed2).sin() * win.w() * 0.3 - i,
      ((index + (i * spread)) * speed3).sin()
        * ((index + i) * speed4).sin()
        * win.h()
        * 0.275
        + i,
    );
    let q = pt2(p.x + (N as f32 - i), p.y + (i - N as f32));
    draw.scale_axes(vec3(1.0, -1.0, 1.0))
      .line()
      .points(q, p)
      .color(rgba(1.0, 1.0, 1.0, 0.8))
      .weight(1.0);
  }

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