specks of me

let specks;
let n = 100;
let shadow;
let nReflections;

function setup() {
  createCanvas(windowWidth * 0.9, windowHeight * 0.9);
  specks = [];
  for (let i = 0; i < n; i++) {
    newSpeck(i);
  }
  nReflections = int(random(5, 20));
  rectMode(CENTER);
  shadow = { x: 0, y: 0 };
}

function draw() {
  translate(width / 2, height / 2);
  t = frameCount;

  background(10, 30, 40, 255 - 255 * abs(sin(t / 500) * sin(t / 500)));

  shadow.x = (width / 200) * sin(t / 1000);
  shadow.y = (height / 200) * cos(t / 1000);
  border();
  push();
  rotate(t / 500);
  manifest();
  stir();
  pop();
}

function stir() {
  for (let i = 0; i < specks.length; i++) {
    if (
      specks[i].x > width / 1.8 ||
      specks[i] < -width / 1.8 ||
      specks[i].y > height / 1.8 ||
      specks[i].y < -height / 1.8
    ) {
      specks.splice(i, 1);
      newSpeck(specks.length);
    } else {
      specks[i].x +=
        specks[i].vx * sin(t / 50) * cos(t / 100) +
        (specks[i].x / 1000) * cos(t / 1000);
      specks[i].y +=
        specks[i].vy * cos(t / 50) * sin(t / 100) +
        random(-0.05, 0.05) +
        (specks[i].x / 1000) * cos(t / 1000);
    }
  }
}
function manifest() {
  noStroke();

  for (let i = 0; i < specks.length; i++) {
    opacity = 240 - 60 * sqrt(specks[i].size);

    for (let j = 0; j < 20; j += 4) {
      d = dist(specks[i].x, specks[i].y, shadow.x, shadow.y);

      fill(
        100 + 120 * abs(sin(d / 20)),
        240,
        255,
        70 - 4 * specks[i].size - j * 2 - d / 20
      );
      for (let k = 0; k < nReflections; k++) {
        push();
        rotate((k * TWO_PI) / nReflections);
        circle(
          specks[i].x,
          specks[i].y,
          specks[i].size - j * (specks[i].size / 20)
        );
        pop();
      }
    }
  }
}

function newSpeck(i) {
  c = max(width, height);
  specks[i] = {
    x: randomGaussian(0, c / 10),
    y: randomGaussian(0, c / 10),
    vx: randomGaussian(0.2, 0.5),
    vy: randomGaussian(0.2, 0.5),
    size: random(1, 20)
  };
}
function border() {
  noFill();
  stroke(20, 50, 60);
  strokeWeight(4);
  rect(0, 0, width - 20, height - 20);
}

function mousePressed() {
  frameCount = 0;
  setup();
  draw();
}

function windowResized() {
  resizeCanvas(windowWidth * 0.9, windowHeight * 0.9);
}