background class for a pysfml project

import sf
import math

class Background ():
    def __init__ (self, texture_id, game):

        self.texture_id = texture_id
        self.game = game

        texture = self.game.resourcemanager.get(self.texture_id)
        self.sprite = sf.Sprite(texture)
        self.sprite.set_sub_rect((0, 0, texture.width, texture.height))

        # whether to tile the background
        self.tile = True

        # whether the background is relative to the camera
        self.fixed = True

        # how much to scroll relative to the camera
        # for example, it will scroll at 10% of the camera speed
        self.scroll = 0.1

        # x and y "speed" for auto scrolling
        self.autoscroll = (1, 1)

    def render (self, t, dt):
        topx = (self.game.view.center[0] - self.game.view.width/2) * self.scroll
        topy = (self.game.view.center[1] - self.game.view.height/2) * self.scroll

        if self.tile:
            self.sprite.x = topx
            self.sprite.y = topy

            xrepeat = int(math.ceil(self.sprite.width/self.game.view.width) / self.scroll)
            yrepeat = int(math.ceil(self.sprite.height/self.game.view.height) / self.scroll)

            xautoscroll = (t * self.autoscroll[0]) % self.sprite.width
            yautoscroll = (t * self.autoscroll[1]) % self.sprite.height

            for y in range(-1, yrepeat):

                for x in range(-1, xrepeat):

                    # % so the sprite position "tiles" too
                    self.sprite.x = int(topx + xautoscroll +
                                     (x * self.sprite.width))

                    self.sprite.y = int(topy + yautoscroll +
                                     (y * self.sprite.height))

                    self.game.window.draw(self.sprite)
        else:
            self.sprite.x = topx
            self.sprite.y = topy
            self.game.window.draw(self.sprite)