createCanvas(400, 400);

  background(220);

  d_range = 0.5

  switch_min = 20

  switch_max = 70

  switch_count = random(switch_min, switch_max)

  x = 0

  y = 0

  dx = random(-d_range, d_range)

  dy = random(-d_range, d_range)

  count = 0

}

​

function draw() {

  translate(width/2, height/2)

  circle(x, y, 3)

  x += dx

  y += dy

  if (count > switch_count) {

    dx = random(-d_range, d_range)

    dy = random(-d_range, d_range)

    switch_count = random(switch_min, switch_max)

    count = 0

  }

  count += 1

}