last_sec = second()

def draw():
    global last_sec
    if last_sec != second():
        draw_clock()
        last_sec = second()

def draw_clock():
    background(192)
    translate(width / 2, height / 2)
    s = second() * TWO_PI / 60.0
    m = minute() * TWO_PI / 60.0
    h = hour() * TWO_PI / 12.0
    rotate(s)
    strokeWeight(1)
    line(0, 0, 0, -width * 0.5)
    rotate(-s + m)
    strokeWeight(2)
    line(0, 0, 0, -width * 0.4)
    rotate(-m + h)
    strokeWeight(4)
    line(0, 0, 0, -width * 0.2)