def __init__(self, layer):
super(Light, self).__init__()
for c in layer.get_children():
sp = Sprite(c.image)
sp.source_position = c.position
sp.position = c.position
sp.scale = c.scale
sp.source_scale = c.scale
sp.rotation = c.rotation
sp.opacity = c.opacity
sp.dx = 0
sp.dy = 0
sp.dt = random.random()*3.15
self.add( sp )
