def draw(self, milliseconds, surface):
        """Draw out the tilemap."""
        self.drawn_rects = []
        cam = Ragnarok.get_world().Camera
        cX, cY, cXMax, cYMax = cam.get_cam_bounds()

        #Draw out only the tiles visible to the camera.
        start_pos = self.pixels_to_tiles( (cX, cY) )
        start_pos -= Vector2(1, 1)
        end_pos = self.pixels_to_tiles( (cXMax, cYMax) )
        end_pos += Vector2(1, 1)

        start_pos.X, start_pos.Y = self.clamp_within_range(start_pos.X, start_pos.Y)
        end_pos.X, end_pos.Y = self.clamp_within_range(end_pos.X, end_pos.Y)

        cam_pos = cam.get_world_pos()
        for x in range(start_pos.X, end_pos.X + 1):
            for y in range(start_pos.Y, end_pos.Y + 1):
                tile = self.tiles[y][x]
                translate_posX = tile.coords.X - cam_pos.X
                translate_posY = tile.coords.Y - cam_pos.Y
                surface.blit(self.spritesheet.image, (translate_posX, translate_posY), tile.source, special_flags = 0)
Draw out the tilemap.