createCanvas(300, 300);

  background(200,200,0);

  noStroke();

}

​

function draw() {

  // background(220);                       // disable automatic clear

  circle(mouseX,mouseY,5)                   // lets call it painting mode

  text(nf(frameRate(),1,1)+" fps",5,20);   // unreadable

  //                  but now for a updated text need to clear area first

  rect( width-130,3,128,23);

  text(year()+"-"+month()+"-"+day()+" "+hour()+":"+minute()+":"+second(),width-120,20);

}