​

function setup() {

  createCanvas(windowWidth, windowHeight);

  noStroke();

  max_distance = dist(0, 0, width, height);

}

​

function draw() {

  background(0);

​

  for (let i = 0; i <= width; i += 20) {

    for (let j = 0; j <= height; j += 20) {

      let size = dist(mouseX, mouseY, i, j);

      size = (size / max_distance) * 66;

      ellipse(i, j, size, size);

    }

  }

}