private void Flap()
{
_flapIntervalCounter++;
if (_flapIntervalCounter == FLAP_INTERVAL)
{
_bird.SetBirdImage(_birdFlapImageCounter);
if (_birdFlapImageCounter == 3)
{
_birdFlapImageCounter = 0;
}
_flapIntervalCounter = 0;
_birdFlapImageCounter++;
}
}