​

function setup() {

  createCanvas(400, 400);

  background(255, 255, 200);

}

​

function draw() {

  //background(220);

  noStroke();

  fill(0, 0, 255);

  console.log("drawing_on is: " + drawing_on)

  if (mouseIsPressed) {

    drawing_on = !drawing_on; 

    // make drawing_on the opposite of what it currently is, if drawing_on is true, then make set it to false, if it is false, set it to true

  }

  if (drawing_on == true) {

    ellipse(mouseX, mouseY, 10, 10)

  }

}