def frame(self, ev):
nt = getTimer()
delta = (nt - self.lastframe)*0.001
for fun in values(self.handlers):
fun(delta)
self.lastframe = nt
if self.show_fps:
self.fps.text = 'fps: ' + (1/delta).toFixed(2)
def start(self, sprite, show_fps=False):
self.sprite = sprite
self.lastframe = getTimer()
self.handlers = []
sprite.addEventListener(Event.ENTER_FRAME, self.frame)
self.show_fps = show_fps
if show_fps:
self.fps = TextField()
sprite.addChild(self.fps)