let xspeed, yspeed;

let xdir, ydir;

function setup() {

  createCanvas(250, 400);

  x = width / 2;

  y = height / 2;

  b1 = new Ball(200, 100, 45, 1, 10, 1, 1);

  b2 = new Ball(200, 200, 45, 1, 5, 1, 1);

  b3 = new Ball(100, 200, 45, 1, 8, 1, 1);

  // ...bn, n = 1, 2, ...

}

​

function draw() {

  background(0);

  b1.move();

  b1.show();

  b2.move();

  b2.show();

  b3.move();

  b3.show();

}

​