let animate = false;

const radius = 25;

​

​

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  x = width / 2;

  y = height / 2;

  xspeed = random(3, 7);

  yspeed = random(3, 7);

  r = 0;

  g = 0;

  b = 0;

}

​

function mousePressed() {

  animate = !animate

}

​

function draw() {

  background(0);

  noStroke();

  fill(r, g, b);

  circle(x, y, radius * 2);

  if (animate) {

    x += xspeed;

    y += yspeed;

  }

  if (x <= radius || x >= width - radius) {

    xspeed = xspeed * -1;

    r = random(255);

    g = random(255);

    b = random(255);

  }

  if (y <= radius || y >= height - radius) {

    yspeed = yspeed * -1;

    r = random(255);

    g = random(255);

    b = random(255);

  }

}

​