w_pressed, s_pressed, up_pressed, down_pressed = False, False, False, False

def keyPressed():
    global w_pressed, s_pressed, up_pressed, down_pressed
    up_pressed =   True if keyCode == UP   else up_pressed
    down_pressed = True if keyCode == DOWN else down_pressed
    w_pressed =    True if key     == 'w'  else w_pressed
    s_pressed =    True if key     == 's'  else s_pressed

def keyReleased():
    global w_pressed, s_pressed, up_pressed, down_pressed
    up_pressed =   False if keyCode == UP   else up_pressed
    down_pressed = False if keyCode == DOWN else down_pressed
    w_pressed =    False if key     == 'w'  else w_pressed
    s_pressed =    False if key     == 's'  else s_pressed


x, y = 300, 300
x_d, y_d = 3.3, 1.2

p1 = 300
p2 = 300

def setup():
    size(600, 600)
    ellipseMode(CENTER)
    rectMode(CENTER)

def draw():
    global x, y, x_d, y_d, p1, p2

    background(255)

    ellipse(x, y, 10, 10)

    x += x_d
    y += y_d

    if x < 0:
        if y > p1 - 50 and y < p1 + 50:
            x_d *= -1.05
            y_d = random(-x_d, x_d)
        else:
            exit()

    if x > height:
        if y > p2 - 50 and y < p2 + 50:
            x_d *= -1.05
            y_d = random(-x_d, x_d)
        else:
            exit()


    if not 0 <= y <= height:
        y_d *= -1

    if w_pressed:
        p1 -= 5
    elif s_pressed:
        p1 += 5

    if up_pressed:
        p2 -= 5
    elif down_pressed:
        p2 += 5

    fill(0)
    rect(0, p1, 5, 100)
    rect(width, p2, 5, 100)