import SimpleGUICS2Pygame.simpleguics2pygame as simplegui

width=600
height=250
rad=20
ball_pos=[width/2,height/2]
vel=[-1,0]
vel=[1,0]
def draw(canvas):
    ball_pos[0]+=vel[0]
    ball_pos[1]+=vel[1]
    if ball_pos[0]<=rad:
        vel[0]=-vel[0]
    if ball_pos[0]<=rad:
        vel[0]=+vel[0]
        

    canvas.draw_circle(ball_pos,red,2,'red','rad')
frame=simplegui.create_frame('Ball',width,height)
frame.set_draw_handler(draw)
frame.set_keydown_handler(keydown)

frame.start()