​

class Circle {

  constructor(circleX, circleY, circleSize) {

    this.circleX = circleX;

    this.circleY = circleY;

    this.circleSize = circleSize;

    this.alpha = 255;

  }

}

​

function setup() {

  createCanvas(300, 300);

  noFill();

  strokeWeight(1);

}

​

function draw() {

  background(255, 236, 153);

  for (let i = 0; i < array.length; i++) {

    array[i].circleSize += 1;

    array[i].alpha -= 5;

    noStroke();

    fill(255, array[i].alpha);

    ellipse(array[i].circleX, array[i].circleY, array[i].circleSize);

  }

  array = array.filter((circle) => circle.alpha > 0);

}

​

function mouseDragged() {

  array.push(new Circle(mouseX, mouseY, 0));

}

​