createCanvas(400, 400);

  background(0);

}

​

function draw() {

  if (mouseIsPressed) {

    brush(mouseX, mouseY);

  }

}

​

function brush(X, Y) {

  noFill();

  stroke(244,223,255,X+2);

  strokeWeight(X/255);

  ellipse(X, Y, X-20,Y-20);

  stroke(255,244,223, X+2);

  strokeWeight(X/100)

  ellipse(X, Y, X-100, Y-100);

}

​