function setup() {

 //create a drawing canvas

 createCanvas(windowWidth, windowHeight);

 frameRate (8);  //try to change this parameter

}

​

function draw() {

  background(70, 80);  //check this syntax with alpha value

  drawElements();

}

​

function drawElements() {

  let num = 9;

  push();

  //move things to the center

  translate(width/2, height/2);

  /* 360/num >> degree of each ellipse's movement;

  frameCount%num >> get the remainder that to know which one

  among 8 possible positions.*/

  let cir = 360/num*(frameCount%num);

  rotate(radians(cir));

  noStroke();

  fill(255, 255, 0);

  //the x parameter is the ellipse's distance from the center

  ellipse(35, 0, 22, 22);

  pop();

  stroke(255, 255, 0, 18);

  //static lines

  line(60, 0, 60, height);

  line(width-60, 0, width-60, height);

  line(0, 60, width, 60);

  line(0, height-60, width, height-60);

}

​

function windowResized() {

  resizeCanvas(windowWidth, windowHeight);

}