let x2,y2;

let x3,y3;

let speed = 1;

​

function setup() {

  createCanvas(400, 400);

  x1 = width/2, y1 = height/2;

  x2 = width/2, y2 = height/2;

  x3 = width/2, y3 = height/2;

  x4 = width/2, y4 = height/2;

}

​

function draw() {

  background(220);

  circle(x1,y1,20)

  circle (x2,y2,20)

  circle (x3,y3,20)

  circle (x4,y4,20)

  x1+=speed;

  x2-=speed;

  y3-=speed;

  y4+=speed;

}