Overflown/gamedata/objects/bg/movingbackground.py

from gamedata.objects.bg.backgrounddrawer import BackgroundDrawer

class MovingBackground(BackgroundDrawer):

    def __init__(self,x,y,game,w,h,sprite,ratio,spdx,spdy):
        super().__init__(x,y,game,w,h,sprite,ratio)
        self.spdx = spdx
        self.spdy = spdy

    def step(self):
        self.rect[0]+=self.spdx
        self.rect[1]+=self.spdy