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pakt10

See /software/p5js/pakt-februari/pakt10/ for a JavaScript version and /software/supercollider/februari-pakt/pakt10/ for accompanying sound code.

use nannou::prelude::*;

const N: u32 = 1200;

fn main() {
  nannou::app(model)
    .update(update)
    .simple_window(view)
    .size(640, 480)
    .run();
}
struct Model {
  index: f32,
  rows: f32,
  cols: f32,
  row_mod: f32,
  col_mod: f32,
  magic: f32,
}
fn model(_app: &App) -> Model {
  let index = 0.0;
  let rows = 11.0;
  let cols = 12.0;
  let row_mod = 2.0;
  let col_mod = 3.0;
  let magic = 0.0;
  Model {
    index,
    rows,
    cols,
    row_mod,
    col_mod,
    magic,
  }
}
fn update(app: &App, model: &mut Model, _update: Update) {
  model.rows += (model.index * 0.0004).sin();
  model.cols += (model.index * 0.0005).sin();
  model.index = app.time * 60.0;
  model.magic = (model.magic + 0.00002) % 15.0;
}
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(0.2, 0.2, 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 r = model.rows
    + ((model.index * 0.013).sin() * model.row_mod)
    + ((model.index * 0.00133).sin() * model.row_mod * 0.56);
  let c = model.cols
    + ((model.index * 0.022).cos() * model.col_mod)
    + ((model.index * 0.00122).cos() * model.col_mod * 0.45);
  for i in 0..N {
    let i = i as f32;
    let p = vec2(
      (r + i) % win.w(),
      ((c + i) * (i % (model.magic + 1.01))) % win.h(),
    );
    let d = vec2(
      10.0 * ((model.index + i) * 0.02).sin(),
      10.0 * ((model.index + i) * 0.03).cos(),
    );
    draw.scale_axes(vec3(1.0, -1.0, 1.0))
      .translate(vec3(win.w(), win.h(), 0.0) * -0.5)
      .line()
      .points(p, p + d)
      .color(rgba(1.0, 1.0, 0.2, 0.85));
  }

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