fullBalloonRising

let nStars = 5000;
nB = 50;
let starA = [];
let buildA = [];
function setup() {
  cnv = createCanvas(windowWidth, windowHeight);
  makeStars();
  for (let i = 0; i < nB; i++) {
    buildA.push(new Building());
  }
  angleMode(DEGREES);
}

function draw() {
  background(30, 0, 255);
  translate(width / 2, height / 2);
  push();
  t = frameCount / 30;
  rotate(t);
  showStars();
  pop();
  fill(0, 255, 157);
  stroke(0, 255, 157);
  strokeWeight(2);
  line(20 * sin(t * 50), (height / 4) * sin(t * 10) - 100, 0, height / 2);
  ellipse(20 * sin(t * 50), (height / 4) * sin(t * 10) - 100, 100, 120);
  triangle(
    20 * sin(t * 50),
    (height / 4) * sin(t * 10) - 100,
    20 * sin(t * 50) + 5,
    (height / 4) * sin(t * 10) - 100 + 65,
    20 * sin(t * 50) - 5,
    (height / 4) * sin(t * 10) - 100 + 65
  );
  skyline();
  circle(0, height / 2, 10);
}

function makeStars() {
  for (let i = 0; i < nStars; i++) {
    starA.push(new Star());
  }
}
function showStars() {
  fill(225, 255, 0);
  noStroke();
  for (let i = 0; i < nStars; i++) {
    starA[i].display();
  }
}

class Star {
  constructor() {
    this.x = random(-width, width);
    this.y = random(-width, width);
    this.r = random(0.5, 4);
  }
  display() {
    circle(this.x, this.y, this.r);
  }
}
class Building {
  constructor() {
    this.n = random(20, 40);
    this.y = random(0, width / 2.5);
    this.c = int(random(1, 4));
    this.r = int(random(25, 40));
  }
}

function skyline() {
  x = -width / 2;
  for (let i = 0; i < nB; i++) {
    fill(255, 0, 97);
    strokeWeight(1);
    rect(x, buildA[i].y, buildA[i].n, width);
    for (let j = 0; j < buildA[i].c; j++) {
      for (let k = 0; k < buildA[i].r; k++) {
        fill(225, 255, 0);
        strokeWeight(0.1);
        if (buildA[i].n <= 30) {
          rect(x + 5, buildA[i].y + 15 * k, buildA[i].r / 1.2, buildA[i].c * 3);
        }
        if (buildA[i].n > 30) {
          rect(x + 20, buildA[i].y + 15 * k, buildA[i].r / 4, buildA[i].c * 3);
          rect(x + 3, buildA[i].y + 15 * k, buildA[i].r / 4, buildA[i].c * 3);
        }
      }
    }
    x = x + buildA[i].n;
  }
}

function mousePressed() {
  nStars = 5000;
  nB = 50;
  starA = [];
  buildA = [];
  makeStars();
  for (let i = 0; i < nB; i++) {
    buildA.push(new Building());
  }
}