createCanvas(windowWidth, windowHeight);

    background(255);

}

function draw() {

  fill ('black');

  noStroke();

  circle(mouseX,mouseY,2,25);

//  cursorBall();

if (mouseIsPressed) {

    r = random (0,255);

    g = random (0,255);

    b = random (0,255);

    a = random (0,255);

      noStroke();

   fill (r,g,b,a);

  circle(mouseX,mouseY,2);}

if (mouseIsPressed) {

    d = random (0,50);

      noStroke();

   fill (r,g,b,a);

  circle(mouseX,mouseY,d,25);}

}

​

// function cursorBall() {

//   background(255);

//   circle(mouseX, mouseY, 10);

// } 

​