dynamic existence

let a, b, c, d, m1, x1, y1, r2, g2, b2;
let nRot;
function setup() {
  cnv = createCanvas(windowWidth * 0.9, windowHeight * 0.9);
  rectMode(CENTER);
  nRot = int(random(5, 16));
  a = width / 6;
  b = height / 6;
  c = random(-3, 3.1);
  d = random(-3, 3.1);
  x1 = random(width);
  y1 = random(height);
  r2 = random(150, 255);
  g2 = random(150, 255);
  b2 = random(150, 255);
  background(r2 / 5, g2 / 5, b2 / 5);
}

function draw() {
  translate(width / 2, height / 2);
  angleMode(DEGREES);
  background(r2 / 5, g2 / 5, b2 / 5, 2);
  stroke(r2, g2, b2, 50);
  if (width < 400) {
    strokeWeight(0.25);
  } else {
    strokeWeight(0.5);
  }

  a1 = a;
  b1 = b;
  c1 = c;
  d1 = d;
  for (let i = 0; i < 1000; i++) {
    x = a1 * sin(x1 * d1 - a1 * y1) - (a1 / 2) * cos(x1 * c1);
    y = b1 * cos(x1 * d1) * sin(c1 + x1);
    m1 = 1.5 - (1 * dist(x, y, 0, 0)) / (width / 2);
    stroke(r2 * m1, g2 * m1, b2 * m1);
    for (let j = 0; j < nRot; j++) {
      push();
      rotate((360 / nRot) * j);
      point(x, y);
      pop();
    }

    x1 = x;
    y1 = y;
  }
  border();
}

function border() {
  noFill();
  stroke(r2 / 6, g2 / 6, b2 / 6);
  strokeWeight(4);
  rect(0, 0, width - 20, height - 20);
}

function mousePressed() {
  setup();
}

function keyPressed() {
  save(cnv, "fleur", "png");
}

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