createCanvas(windowWidth, windowHeight)

  textSize(9)

  for (var i = 0; i < windowWidth || i < windowHeight; i = i + 50) {

    if(i!==0){

      stroke("lightgrey")

      line(i, 20, i, windowHeight-20)

      line(20, i, windowWidth-20, i)

      noStroke()

      textAlign(CENTER)

      text(i, i, 10)

      textAlign(LEFT)

      text(i, 0, i+4)

    }

  }

  fill("black")

  noStroke()

  circle(100, 100, 10)

  textSize(18)

  text("(100,100)", 115, 105)

}