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pakt11

See /software/p5js/pakt-februari/pakt11/ for a JavaScript version and /software/supercollider/februari-pakt/pakt11/ for accompanying sound code.

use nannou::lyon;
use nannou::prelude::*;

fn main() {
  nannou::app(model)
    .update(update)
    .simple_window(view)
    .size(640, 480)
    .run();
}
struct Model {
  index: f32,
  rows_mid: f32,
  cols_mid: f32,
}
fn model(_app: &App) -> Model {
  let index = 0.0;
  let rows_mid = 22.0;
  let cols_mid = 20.0;
  Model {
    index,
    rows_mid,
    cols_mid,
  }
}
fn update(app: &App, model: &mut Model, _update: Update) {
  model.index = app.time * 60.0;
}
fn view(app: &App, model: &Model, 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(0.6, 0.5, 0.5)));

    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 rows = model.rows_mid + ((model.index * 0.0015).sin() * 10.0);
  let cols = model.cols_mid + ((model.index * 0.0024).sin() * 10.0);
  let mut builder = nannou::geom::path::Builder::new().with_svg();
  builder.move_to(lyon::math::point(0.0, 0.0));
  for y in 0..=rows as u32 {
    let y = y as f32;
    for x in 0..=cols as u32 {
      let x = x as f32;

      let p = pt2(
        (x / rows * win.w()) + (model.index + (x * y) * 32.0).sin(),
        (y / cols * win.h()) + (model.index + (x * y) * 24.0).cos(),
      );
      builder.line_to(lyon::math::point(p.x, p.y));

      let p = pt2(
        (x / cols * win.w()) + (model.index + (x * y) * 32.0).sin(),
        (y / rows * win.h()) + (model.index + (x * y) * 24.0).cos(),
      );
      builder.line_to(lyon::math::point(p.x, p.y));
    }
  }

  builder.close();
  let path = builder.build();
  draw.scale_axes(vec3(0.96, -0.96, 1.0))
    .translate(vec3(win.w() * -0.5 - 5.0, win.h() * -0.5 - 5.0, 0.0))
    .path()
    .fill()
    .color(WHITE)
    .events(path.iter());

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