​

function setup() {

  createCanvas(400, 400);

  fill(0);

  noStroke();

  px = mouseX; // initialize the previous shape position

  py = mouseY;

}

​

function draw() {

​

  if(mouseIsPressed) {   // is the mouse pressed ?

    // calculate the distance between the mouse and the previous shape

    let distance = dist(px,py,mouseX, mouseY);

    if(distance > 10){ // checking if that distance is big enough

      circle(mouseX, mouseY,10); // drawing the circle

      px = mouseX; // update previous shape position

      py = mouseY;

    }   

  }

}

​

​