turtle.register_shape("invader.gif")
turtle.register_shape("player.gif")
turtle.register_shape("shield",((0,0),(14,0),(14,-1),(15,-1)(15,-2),(16,-2),
(16,-3,(17,-3),(17,-4),(18,-4),(18,-5),(18,-7),(14,-7),(14,-6),(13,-6),
(13,-5),(11,-5),(11,-6),(10,-6),(10,-7),(6,-7),(6,-5),(5,-5),(5,-4),(4,-4),
(4,-3),(3,-3),(3,-2),(2,-2),(2,-1)))



border_pen = turtle.Turtle()
border_pen.speed(0)
border_pen.color("white")