pakt18

See /software/p5js/pakt-februari/pakt18/ for a JavaScript version and /software/supercollider/februari-pakt/pakt18/ for accompanying sound code.

use nannou::prelude::*;

const N: u16 = 50;

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 * 0.002).sin() * 50.0 + ((index * 0.003).sin() * 40.0);

  for i in 1..N {
    let i = i as f32;

    let a = ((i * spread + index) * (index * 0.0025 + (index * 0.0050).sin()).sin() * 0.005)
      .sin()
      * 0.45
      + 0.5;
    let b = ((i * spread + index) * (index * 0.0024 + (index * 0.0051).sin()).sin() * 0.005)
      .sin()
      * 0.45
      + 0.5;
    let c = ((i * spread + index) * (index * 0.0023 + (index * 0.0052).sin()).sin() * 0.005)
      .sin()
      * 0.45
      + 0.5;
    let d = ((i * spread + index) * (index * 0.0022 + (index * 0.0053).sin()).sin() * 0.005)
      .sin()
      * 0.45
      + 0.5;

    let p1 = vec2(a, b) * win.wh();
    let p2 = vec2(c, d) * win.wh();
    let p3 = vec2(b, a) * win.wh();
    let p4 = vec2(d, c) * win.wh();

    draw.scale_axes(vec3(1.0, -1.0, 1.0))
      .translate(vec3(win.w(), win.h(), 0.0) * -0.5)
      .line()
      .points(p1, p2)
      .color(rgba(1.0, 1.0, 1.0, (i / N as f32 * PI).sin()));
    draw.scale_axes(vec3(1.0, -1.0, 1.0))
      .translate(vec3(win.w(), win.h(), 0.0) * -0.5)
      .line()
      .points(p3, p4)
      .color(rgba(1.0, 1.0, 1.0, (i / N as f32 * PI).sin()));
  }

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