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pakt09

See /software/p5js/pakt-februari/pakt09/ for a JavaScript version and /software/supercollider/februari-pakt/pakt09/ for accompanying sound code.

use nannou::prelude::*;

const N: u32 = 1000;

fn main() {
  nannou::app(model)
    .update(update)
    .simple_window(view)
    .size(640, 480)
    .run();
}
struct Model {
  index: f32,
  m: u32,
  rows: f32,
  cols: f32,
  magic: f32,
}
fn model(_app: &App) -> Model {
  let index = 0.0;
  let m = 0;
  let rows = 3.0;
  let cols = 4.0;
  let magic = 50.0;
  Model {
    index,
    m,
    rows,
    cols,
    magic,
  }
}
fn update(app: &App, model: &mut Model, _update: Update) {
  model.index = app.time * 60.0;
  if model.m < N {
    model.m += 1;
  }
  model.magic += (model.index * 0.001).sin() * 0.01;
  model.rows += (model.index * 0.0004).sin();
  model.cols += (model.index * 0.0005).sin();
}
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(0.5, 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);
  }

  for i in 0..model.m {
    let i = i as f32;
    let p = pt2(
      (model.rows + i) % win.w(),
      (model.cols + i) * (i % model.magic) % win.h(),
    );
    let d = pt2(
      8.0 * ((model.index + i) * 0.012).sin(),
      8.0 * ((model.index + i) * 0.011).cos(),
    );
    draw.scale_axes(vec3(1.0, -1.0, 1.0))
      .translate(vec3(win.w(), win.h(), 0.0) * -0.5)
      .rect()
      .xy(p)
      .wh(d)
      .color(rgba(1.0, 1.0, 1.0, 0.85));
  }

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