class Camera(object):
    def __init__(self, width, height):
        self.camera = Rect(0, 0, width, height)
        self.width = width
        self.height = height

    def apply(self, entity):
        return entity.rect.move(self.camera.topleft)

    def update(self, target):
        x = -target.rect.x + int(WIN_WIDTH / 2)
        y = -target.rect.y + int(WIN_HEIGHT/2)

        #Limit scrolling to map size
        x = min(0, x) #Left
        y = min(0, y) #Top
        x = max(-(self.width - WIN_WIDTH), x) #Right
        y = max(-(self.height - WIN_HEIGHT), y)#Bottom
        self.camera = Rect(x, y, self.width, self.height)