pakt14

See /software/p5js/pakt-februari/pakt14/ for a JavaScript version and /software/supercollider/februari-pakt/pakt14/ for accompanying sound code.

use nannou::lyon;
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 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, 0.5, 0.6)));

    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);
  }

  let index = app.time * 60.0;
  let mut builder = nannou::geom::path::Builder::new().with_svg();
  for i in 0..=N {
    let ii = i as f32;
    let spreadx = ((ii + index) * 0.011).sin() * ((ii + index) * 0.013).sin();
    let spready = ((ii + index) * 0.012).sin() * ((ii + index) * 0.014).sin();
    let spread = spreadx * spready * 0.25 + ((index + ii) * 0.001).cos();

    let mut yy = ((ii + index) * 0.012 + spready).sin();
    let mut hh = yy * (index * 0.013).cos();
    let mut xx = ((ii + index) * 0.014 + spreadx).cos();
    let mut ww = xx * (index * 0.015).sin();
    yy *= win.h() * spread + (win.h() * 0.5);
    xx *= win.h() * spread + (win.h() * 0.5);
    hh *= win.h() * spread + (win.h() * 0.5);
    ww *= win.h() * spread + (win.h() * 0.5);
    if i == 0 {
      builder.move_to(lyon::math::point(xx, yy));
    } else if i % 5 == 1 {
      builder.quadratic_bezier_to(lyon::math::point(xx, yy), lyon::math::point(ww, hh));
    } else if i % 5 == 2 {
      builder.quadratic_bezier_to(lyon::math::point(yy, xx), lyon::math::point(hh, ww));
    } else if i % 5 == 3 {
      builder.quadratic_bezier_to(lyon::math::point(xx, yy), lyon::math::point(hh, ww));
    } else if i % 5 == 4 {
      builder.quadratic_bezier_to(lyon::math::point(yy, xx), lyon::math::point(ww, hh));
    } else {
      builder.move_to(lyon::math::point(yy, xx));
    }
  }
  let path = builder.build();
  draw.scale_axes(vec3(1.0, -1.0, 1.0))
    .path()
    .fill()
    .color(rgba(1.0, 1.0, 1.0, 0.85))
    .events(path.iter());

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