spinning at the bow

let starA = [];
let delta = 1;
let r = 10;
let maxStars = 200;
let playBool = true;
let portH;
let df, rf;
function setup() {
  createCanvas(windowWidth, windowHeight);
  noStroke();
  background(10);
  portH = max(width, height) * 1.1;
  for (let i = 0; i < maxStars; i++) {
    starA.push(new Star(random(-portH, portH), random(-portH, portH)));
  }
}
function draw() {
  t = frameCount / 1000;
  translate(width / 2, height / 2);
  rf = map(mouseX, 0, width, -PI, PI);
  rotate(t * rf);
  df = map(mouseY, 0, height, 0, 1);
  delta = df;
  if (!playBool) {
    background(10, 10, 10, 50);
    df = 0;
  } else {
    background(10, 10, 10, 5 + (100 - 100 * df));
  }
  for (let i = 0; i < starA.length; i++) {
    if (playBool) {
      starA[i].move();
    }
    starA[i].display();
    if (dist(starA[i].x, starA[i].y, 0, 0) >= portH) {
      starA.splice(i, 1);
    } else {
      starA[i].display();
    }
  }
  while (starA.length < maxStars) {
    starA.push(new Star(r * randomGaussian(1, 3), r * randomGaussian(1, 3)));
  }
}

class Star {
  constructor(x, y) {
    this.x = x;
    this.y = y;
    this.m = this.y / this.x;
    this.c = color(random(200, 255), random(200, 255), random(200, 255));
    this.r1 = random(200, 240);
    this.g1 = random(200, 255);
    this.b1 = random(200, 255);
    this.s = random(0.5, 3);
    let b = random(0, 1);
    this.nA = [];
    if (b > 0.993) {
      this.nebulaBool = true;
      for (let i = 0; i < 800; i++) {
        this.nA[i] = createVector(
          randomGaussian((-10 * this.s) / 2, (10 * this.s) / 2),
          randomGaussian((-30 * this.s) / 2, (30 * this.s) / 2)
        );
      }
    } else {
      this.nebulaBool = false;
    }
  }
  display() {
    fill(this.c);
    let dis = dist(this.x, this.y, 0, 0);
    if (playBool) {
      circle(this.x, this.y, (this.s * dist(this.x, this.y, 0, 0)) / 300);
    } else {
      circle(
        this.x,
        this.y,
        max(0.2, (this.s * dist(this.x, this.y, 0, 0)) / 300)
      );
    }
    if (this.nebulaBool) {
      push();
      rotate(this.m);
      for (let i = 0; i < this.nA.length; i++) {
        let tmpd = abs(dist(this.x, this.y, this.nA[i].x, this.nA[i].y));
        if (playBool) {
          fill(
            this.r1 - 20 / tmpd,
            this.g1 - 20 / tmpd,
            this.b1 - 20 / tmpd,
            1
          );
        } else {
          fill(
            this.r1 - 20 / tmpd,
            this.g1 - 20 / tmpd,
            this.b1 - 20 / tmpd,
            2
          );
        }

        circle(
          this.x + (this.nA[i].x * dist(this.x, this.y, 0, 0)) / 300,
          this.y + (this.nA[i].y * dist(this.x, this.y, 0, 0)) / 300,
          min(
            5 + abs(tmpd),
            (abs(this.nA[i].y / 5) * abs(dist(this.x, this.y, 0, 0))) / 300
          )
        );
      }
      pop();
    }
  }
  move() {
    if (this.x >= 0) {
      let a = sqrt(this.x * this.x + this.y * this.y);
      let x1 = this.x;
      let y1 = this.y;
      this.x = (delta * x1) / a + x1;
      this.y = (delta * y1) / a + y1;
    } else {
      let a = sqrt(this.x * this.x + this.y * this.y);
      let x1 = this.x;
      let y1 = this.y;
      this.x = (delta * x1) / a + x1;
      this.y = (delta * y1) / a + y1;
    }
  }
}

function mousePressed() {
  background(0, 0, 0, 150);
  playBool = !playBool;
}