​

function setup() {

  createCanvas(500, 500);

​

  planets.push(new Planet(width * 0.75, height * 0.5));

}

​

function mousePressed() {

  planets.push(new Planet(mouseX, mouseY));

}

​

function draw() {

  background(32);

​

  // sun

  fill(255, 255, 0);

  circle(width / 2, height / 2, 50);

​

  for (const planet of planets) {

    planet.draw();

  }

}

​

class Planet {

  constructor(x, y) {

    this.x = x;

    this.y = y;

​

    // random size

    this.size = random(10, 50);

​

    // random speed

    this.deltaX = random(-10, 10);

    this.deltaY = random(-10, 10);

    // random color

    this.c = color(random(128, 255), random(128, 255), random(128, 255));

  }

​

  draw() {

    const sunX = width / 2;

    const sunY = height / 2;

    const distanceFromSun = dist(this.x, this.y, sunX, sunY);

​

    // planets accelerate faster when they're closer to the sun

    // this simulates gravity pulling them in faster and faster

    this.deltaX += (sunX - this.x) / distanceFromSun;

    this.deltaY += (sunY - this.y) / distanceFromSun;

    this.x += this.deltaX;

    this.y += this.deltaY;

​

    fill(this.c);

    ellipse(this.x, this.y, this.size);

  }

}

​