let bg = 255;

​

​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  //createCanvas(w, h);

  //print("setup");//calls once

  //console.log("setup");

}

​

function draw() {

  background(bg);

  bg = bg-1;

  //print("draw");//call every frame

  strokeWeight(x/10);

  //ellipse(x,y,w,h);

  ellipse(width/2,height/2,x,x);

  x = x + 1;

}